FORGED STEEL FLANGES
1. Holes accurately drilled for ease of assembly.
2. Spot facing ensures seating of fasteners true and square.
3. Grain flow controlled for maximum strength.
4. Smooth accurate bore for unrestricted flow.
5. Machined bevel and land facilitate good welding.
6. All faces machined within tolerances to ensure true alignment.
7. Full identification of size, pressure class, material and heat code.
•2•
FORGED
STEEL FLANGES
INDEX
FLANGES CLASS 150 (PN20) to CLASS 2500 (PN 420)
Welding Neck, Slip-on,
Threaded, Socket Welding
Lap Joint, Blind ....................................................................................................Page 36
REDUCING FLANGES
Welding Neck, Threaded, Slip-on ........................................................................Page 18
ORIFICE FLANGES CLASS 300 - 1500 (PN 50-250)
Welding Neck, Slip-on, Threaded ........................................................................Page 24
LONG WELDING NECKS ..........................................................................................Page 33
LARGE DIAMETER FLANGES
Class 125 LW Slip-on ..........................................................................................Page
Class 125 Welding Neck, Slip-on, Blind ..............................................................Page
Class 250.............................................................................................................Page
Class 75...............................................................................................................Page
Class 175.............................................................................................................Page
Class 350.............................................................................................................Page
AWWA Class B, D, E, Slip-on..............................................................................Page
Class 150 Series A ASME B16.47 ......................................................................Page
Class 150 Series B ASME B16.47 ......................................................................Page
34
35
36
37
38
39
40
41
46
ENGINEERING AND DESIGN DATA
Bolt and Stud Dimensions ...................................................................................Page 22
Flange Facing Dimensions ..................................................................................Page 20
Flange Facing and Finish Data .............................................................................Page 4
Gasket Dimensions .............................................................................................Page 20
Identification, Marking..........................................................................................Page 47
Manufacturing Standards, Specifications ..............................................................Page 5
Materials ................................................................................................................Page 5
Ring Joint Dimensions.........................................................................................Page 30
Tolerances ...........................................................................................................Page 47
Welding Bevels ....................................................................................................Page 48
•3•
FLANGE TYPES, FACINGS AND FINISHES
ANSI FLANGES
Most forged steel flanges correspond to the requirements of the American Standards Association (ASME/ANSI Standard B16.5)
and the ASTM Specification A-105.
The following types are manufactured and stocked:
Welding Neck flanges, available in all pressure ratings and sizes, are butt-welded to the end of the pipe, and are usually specified
when service conditions are severe and excellent workmanship necessary. Since the inside diameter of the flange must match
that of the pipe, the flange bore should be specified in ordering.
Slip-on flanges, also available in most pressure ratings and sizes, are a popular type due to their ease of application. This flange
slips over the end of the pipe and is usually set so that the flange face is about .375" (9.5mm) beyond the end of the pipe. This
permits double-welding of the flange - one strength fillet weld to join the hub of the flange to the pipe, and a seal fillet weld inside
the flange at the end of the pipe. Where operating conditions permit, the seal weld is omitted.
Slip-on flanges are most frequently used at lower pressure - Class 150 (PN 20) or Class 300 (PN 50) primary service pressure
ratings. Many pipe designers are reluctant to use slip-ons for higher pressures, since (1) the joint between the flange and pipe is
not as strong as in the welding neck type; and (2) the junction of the flange and pipe is more susceptible to corrosion.
Screwed or Threaded flanges are attached to the pipe like any other screwed fittings, and may be back-welded to seal the joint
between pipe and flange. Although still available in most sizes and pressure ratings, screwed fittings today are used almost
exclusively in smaller pipe sizes and at low pressures.
Lap Joint or Van Stone flanges are used on piping equipped with lap joint stub ends or with lapped pipe. They may be used at all
pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it;
bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap.
Lap Joint flanges have certain special advantages: (1) freedom to swivel around the pipe facilitates the lining up of opposing flange
bolt holes; (2) lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion
resistant pipe or tubing; (3) in systems which erode or corrode quickly, the flanges may be salvaged for re-use.
Socket-welding flanges contain a recess in the back of the flange to receive the end of the pipe, which is attached by a fillet weld
around the hub of the flange. Since socket-welding connections are not as strong as butt-welded joints, the use of this type of
flange is almost always confined to NPS 4 (DN 100) and smaller sizes, and to the lower pressure ratings. Its chief advantage lies
in the ease of preparation and installation.
Blind flanges, available in all sizes and pressure ratings, are solid forgings used to close off the end of a piping system and to
gain easy access to the interior of the line.
Reducing flanges are available. Refer to page 18.
FLANGE FACINGS
Unless otherwise specified, Class 150 (PN 20) and Class 300 (PN 50) flanges in all types except lap joint (or Van Stone) flanges
are furnished with a .06" (1.6mm) raised face (which is included in the flange thickness dimension). Heaver pressure ratings are
machined with a .25" (6.4 mm) raised face, in addition to the designated flange thickness.
When so ordered, these flange types can be furnished with a variety of other facings, such as male and female, ring joint, tongue
and groove, etc.
Lap Joint flanges are machined with a flat face and a fillet radius to accommodate the stub end or pipe lap.
FLANGE FINISHES
The finish of contact faces of pipe flanges and connecting end flanges of fittings shall be judged by visual comparison with AARH
Standards and not by instruments having stylus tracers and electronic amplification (see ANSI/ASME B46.1)
The finishes required are given below. Other finishes may be furnished upon application.
RAISED FACE AND LARGE MALE AND FEMALE: Either a serrated-concentric or serrated-spiral finish having from 45 to 55
grooves per inch (0.6 to 1mm pitch) shall be used. The cutting tool employed shall have an approximate 0.06" (1.6mm) or larger
radius. The resultant surface shall have a 125 to 250 microinch roughness.
TONGUE AND GROOVE AND SMALL MALE AND FEMALE: The gasket contact shall not exceed 125 microinch roughness.
RING JOINT: The side wall surface of gasket groove shall not exceed 63 microinch roughness.
OTHER TYPES
In addition to the ANSI flanges, the following types are carried in stock:
Orifice flanges are used for measuring fluid flow in piping systems. Their design conforms to the recommendations of the
American Gas Association’s Committee on Gas Measurement. Commonly furnished as either welding neck or slip-on type, they
may also be ordered as screwed flanges. Orifice unions are available in Class 300 (PN 50) and heavier pressure ratings.
Each Orifice flange is equipped with two radially-drilled, tapped holes for metering, and with jack-screws to facilitate separation
of the joint for removal of the orifice metering plate. Orifice flanges, unless otherwise specified, are furnished in pairs as a flange
union, complete with bolts, nuts and jack-screws - but without the orifice plate. Gaskets are supplied with raised face flange
unions, but not for ring-joint faced flanges, which use an integral gasket and orifice plate.
Light Weight Slip-on flanges, drilled to Class 125 ANSI Standards but of lighter construction than the regular slip-on type, are
available for low-pressure systems.
Large Diameter flanges, in sizes beyond the B16.5 range, are available for special installations. Dimensions given herein are those
most commonly used; however, flanges and rolled rings for large diameter pipe or for vessels and tanks can readily be made to
other specifications.
Long Welding Necks are used primarily for outlets for vessels and tanks. Drilled to ANSI Standards, they are forged with long,
heavy-wall, straight hubs, and finished with square cut ends.
•4•
MATERIAL AND
MANUFACTURING
STANDARDS
The manufacturing of forged steel flanges is governed by industry standards written by (1) the American Society for Testing and
Materials (ASTM); (2) the American National Standards Institute (ANSI); (3) the Manufacturer’s Standardization Society of the Valve
and Fittings Industry (MSS); (4) the American Petroleum Institute (API); (5) the Canadian Standards Association (CSA); (6) the
American Society of Mechanical Engineers (ASME); and (7) the Pipe Fabrication Institute (PFI). They cover specifications for
materials, methods of manufacture, dimensions and quality control procedures. CCTF forged steel flanges conform to all applicable
standards.
ASTM SPECIFICATIONS
ASTM specifications are, basically, materials specifications. They regulate approved raw materials from which flanges can be
made - ingots, or blooms, billets, slabs or bars. In addition, they govern the methods of manufacture, quality control procedures
and markings of forged steel flanges. ASTM specifications are divided into five categories:
A105 - Carbon grades for high temperature service
A181 - Carbon grades for general service
* A182 - Alloy and stainless grades for high temperature service
A350 - Carbon and alloy grades for low temperature service
*CCTF flanges are available in a wide range of alloy and stainless steels, including grades F304, F304L, F316, F316L. Please
refer to CCTF catalogue “Stainless Steel Flanges” for the popular Classes 150 and 300 (PN 20 and 50).
MSS, API, AWWA, ANSI AND CSA STANDARDS
ANSI, MSS and API standards govern flange dimensions and tolerances. ASME/ANSI B16.5, titled “Steel Pipe Flanges and
Flanged Fittings”, is the basic standard. It covers forged steel flanges, sizes NPS 1/2 (DN 15) through NPS 24 (DN 600). CSA
standard CAN3-Z245 12-M96 covers the manufacture, dimensions, tolerances and material requirements for pipe line flanges.
ASME/ANSI B16.36 covers Orifice flanges. The following MSS, API and AWWA standards are written to supplement B16.5:
MSS SP-6:
Flange facings
MSS SP-9:
Spot facing for bronze, iron and steel flanges
MSS SP-25:
Marking of flanges
MSS SP-39:
Bolts and nuts for flanges
API6A:
Wellhead equipment
AWWA C207:
Hub flanges
The following codes are not flange specifications, but they influences the manufacture of forged steel flanges:
ASME:
Boiler and Pressure Vessel Code
ASME/ANSI B31.1:
Power Piping
ASME/ANSI B31.3:
Petroleum and refinery piping
ASME/ANSI B31.4:
Liquid petroleum transportation piping systems
ASME/ANSI B31.5:
Refrigeration piping
ASME/ANSI B31.8:
Gas transmission and distribution piping systems
ANSI/ASME B36.10M: Standard for wrought steel pipe
ANSI/ASME B36.19M: Standard for stainless steel pipe
ANSI/ASME B16.47:
Large diameter pipe line flanges NPS 22 (DN 550) and NPS 26 (DN 650) through NPS 36 (DN900)
METRIC EQUIVALENTS
The International System (SI)
NPS (Nominal Pipe Size)
Operating Pressure Class
1 inch
1 pound, weight
1 pound, pressure
1 p.s.i., stress
metric equivalent of British units are shown throughout this catalogue.
= DN* (Nominal Diameter)
= PN* (Pressure Number)
= 25.4 millimetres
= 0.4536 kilograms
= 0.06895 bars
= 0.006895 megapascals (MPa)
*From the SI designations, Diamètre Nominal and Pression Nominale.
•5•
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
2
3
FLANGE
OUTSIDE
DIAMETER
O
3.50
89
3.88
98
4.25
108
4.62
117
5.00
127
6.00
152
7.00
178
7.50
191
8.50
216
9.00
229
10.00
254
11.00
279
13.50
343
16.00
406
19.00
483
21.00
535
23.50
595
25.00
635
27.50
700
32.00
815
FLANGE2
THICKNESS
MIN.
T
.44
11.5
.50
13.0
.56
14.5
.62
16.0
.69
17.5
.75
19.5
.88
22.5
.94
24.0
.94
24.0
.94
24.0
.94
24.0
1.00
25.5
1.12
29.0
1.19
30.5
1.25
32.0
1.38
35.0
1.44
37.0
1.56
40.0
1.69
43.0
1.88
48.0
RAISED
FACE
DIA.
A
1.38
34.9
1.69
42.9
2.00
50.8
2.50
63.5
2.88
73.0
3.62
92.1
4.12
104.8
5.00
127.0
5.50
139.7
61.9
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.8
15.00
381.0
16.25
412.8
18.50
469.9
21.00
533.4
23.00
584.2
27.25
692.2
WELDING
NECK &
SOCKET
WELDING
B3
.62
15.8
.82
20.8
1.05
26.7
1.38
35.1
1.61
40.9
2.07
52.6
2.47
62.7
3.07
78.0
3.55
90.2
4.03
102.4
5.05
128.3
6.07
154.2
7.98
202.7
10.02
254.5
12.00
304.8
To be
specified
by
purchaser
Socket Welding Flanges, sizes NPS 3 1/2 (DN 90) and larger are not
covered by ASME/ANSI B16.5.
Includes .06" (1.6 mm) raised face.
These dimensions correspond to inside diameters of pipe as given in
ANSI/ASME B36.10M for Standard Wall Pipe. Thickness of Standard
Wall is the same as Schedule 40 in size NPS 10 (DN 250) and smaller.
•6•
BORE
SLIP-ON &
SOCKET WELD
SOCKET
MIN.
C
.88
22.2
1.09
27.8
1.36
34.5
1.70
43.2
1.95
49.5
2.44
61.9
2.94
74.6
3.57
90.7
4.07
103.4
4.57
116.1
5.66
143.7
6.72
170.7
8.72
221.5
10.88
276.2
12.88
327.0
14.14
359.2
16.16
410.4
18.18
461.8
20.20
513.1
24.25
615.9
LENGTH TRU HUB 2
LAP
JOINT
MIN.
D
.90
22.9
1.11
28.2
1.38
34.9
1.72
43.7
1.97
50.0
2.46
62.5
2.97
75.4
3.60
91.4
4.10
104.1
4.60
116.8
5.69
144.5
6.75
171.4
8.75
222.2
10.92
277.4
12.92
328.2
14.18
360.2
16.19
411.2
18.20
462.3
20.25
514.3
24.25
615.9
WELDING
NECK
F
1.88
47.6
2.06
52.4
2.19
55.6
2.25
57.1
2.44
61.9
2.50
63.5
2.75
69.8
2.75
69.8
2.81
71.4
3.00
76.2
3.50
88.9
3.50
88.9
4.00
101.6
4.00
101.6
4.50
114.3
5.00
127.0
5.00
127.0
5.50
139.7
5.69
144.5
6.00
152.4
SLIP-ON,
THREADED &
SOCK. WELD
G
.62
16
.62
16
.69
17
.81
21
.88
22
1.00
25
1.12
29
1.19
30
1.25
32
1.31
33
1.44
36
1.56
40
1.75
44
1.94
49
2.19
56
2.25
57
2.50
64
2.69
68
2.88
73
3.25
83
LAP
JOINT
H
.62
16
.62
16
.69
17
.81
21
.88
22
1.00
25
1.12
29
1.19
30
1.25
32
1.31
33
1.44
36
1.56
40
1.75
44
1.94
49
2.19
56
3.12
79
3.44
87
3.81
97
4.06
103
4.38
111
INCHES
MILLIMETRES
CLASS 150 (PN20)
FLANGES
FORGED STEEL
ASTM A-105
1
ASME/ANSI B16.5
DRILLING
NO. OF
HOLES
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
20
20
20
20
DIA. OF
HOLES
J
.62
16
.62
16
.62
16
.62
16
.62
16
.75
20
.75
20
.75
20
.75
20
.75
20
.88
23
.88
23
.88
23
1.00
26
1.00
26
1.12
29
1.12
29
1.25
32
1.25
32
1.38
35
DIAMETER OF HUB
DIA. OF
BOLT
CIRCLE
K
2.38
60.3
2.75
69.8
3.12
79.4
3.50
88.9
3.88
98.4
4.75
120.6
5.50
139.7
6.00
152.4
7.00
177.8
7.50
190.5
8.50
215.9
9.50
241.3
11.75
298.4
14.25
361.9
17.00
431.8
18.75
476.2
21.25
539.7
22.75
577.8
25.00
635.0
29.50
749.3
DEPTH1
OF
SOCKET
L
.38
10
.44
11
.50
13
.56
14
.62
16
.69
17
.75
19
.81
21
-
AT
BASE
M
1.19
30.2
1.50
38.1
1.94
49.2
2.31
58.7
2.56
65.1
3.06
77.6
3.56
90.5
4.25
107.9
4.81
122.2
5.31
134.9
6.44
163.5
7.56
192.1
9.69
246.1
12.00
304.8
14.38
365.1
15.75
400.0
18.00
457.2
19.88
504.8
22.00
558.8
26.12
663.6
AT
CHAMFER
N
.84
21.4
1.05
26.6
1.32
33.5
1.66
42.1
1.90
48.3
2.38
60.4
2.88
73.0
3.50
88.9
4.00
101.6
4.50
114.3
5.56
141.3
6.63
168.3
8.63
219.1
10.75
273.0
12.75
323.8
14.00
355.6
16.00
406.4
18.00
457.2
20.00
508.0
24.00
609.6
LAP
JOINT
FILLET
RADIUS
r
.12
3
.12
3
.12
3
.19
5
.25
6
.31
8
.31
8
.38
10
.38
10
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
APPROXIMATE WEIGHT
SLIP-ON,
THREADED &
SOCKET
WELDING
LAP
WELDING1
NECK
BLIND
JOINT
2
0.9
2
0.9
3
1.4
3
1.4
4
1.8
6
2.7
8
3.6
10
4.5
12
5.4
15
6.8
19
8.6
24
10.9
39
17.7
52
23.6
80
36.3
110
50.0
140
64.0
150
68.0
180
81.6
260
118
1
.05
2
0.9
2
0.9
3
1.4
3
1.4
5
2.3
7
3.2
8
3.6
11
5.0
13
5.9
15
6.8
19
8.6
30
13.6
43
19.5
64
29.0
90
41.0
98
44.5
130
59.0
165
75.0
220
99.8
1
0.5
2
0.9
2
0.9
3
1.4
4
1.8
5
2.3
7
3.2
9
4.1
13
5.9
17
7.7
20
9.1
26
11.8
45
20.4
70
31.8
110
49.9
140
63.5
180
81.6
220
99.8
285
129.0
430
195.0
1
0.5
2
0.9
2
0.9
3
1.4
3
1.4
5
2.3
7
3.2
8
3.6
11
5.0
13
5.9
15
6.8
19
8.6
30
13.6
43
19.5
64
29.0
105
47.6
140
63.5
160
72.6
195
88.5
275
125.0
For bevel of Welding Neck, see page 48.
Gasket dimensions - page 20.
Bolting dimensions - page 22.
POUNDS
KILOGRAMS
Flange facing dimensions - page 20.
•7•
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
2
3
FLANGE
OUTSIDE
DIAMETER
O
3.75
95
4.62
117
4.88
124
5.25
133
6.12
156
6.50
165
7.50
191
8.25
210
9.0
229
10.0
254
11.0
279
12.5
318
15.0
381
17.5
445
20.5
520
23.0
585
25.5
650
28.0
710
30.5
775
36.0
915
FLANGE2
THICKNESS
MIN.
T
.56
14.5
.62
16.0
.69
17.5
.75
19.5
.81
21.0
.88
22.5
1.00
25.5
1.12
29.0
1.19
30.5
1.25
32.0
1.38
35.0
1.44
37.0
1.62
41.5
1.88
48.0
2.00
51.0
2.12
54.0
2.25
57.5
2.38
60.5
2.50
63.5
2.75
70.0
RAISED
FACE
DIA.
A
1.38
34.9
1.69
42.9
2.00
50.8
2.50
63.5
2.88
73.0
3.62
92.1
4.12
104.8
5.00
127.0
5.50
139.7
6.19
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.8
15.00
381.0
16.25
412.8
18.50
469.9
21.00
533.4
23.00
584.2
27.25
692.2
WELDING
NECK &
SOCKET
WELDING
B3
.62
15.8
.82
20.8
1.05
26.6
1.38
35.1
1.61
40.9
2.07
52.6
2.47
62.7
3.07
77.9
3.55
90.1
4.03
102.3
5.05
128.2
6.07
154.1
7.98
202.7
10.02
254.5
12.00
304.8
To be
specified
by
purchaser
BORE
SLIP-ON &
SOCKET WELD
SOCKET
MIN.
C
.88
22.2
1.09
27.8
1.36
34.5
1.70
43.3
1.95
49.6
2.44
61.9
2.94
74.6
3.57
90.7
4.07
103.4
4.57
116.1
5.66
143.7
6.72
170.7
8.72
221.5
10.88
276.2
12.88
327.0
14.14
359.2
16.16
410.4
18.18
461.8
20.20
513.1
24.25
615.9
Socket Welding Flanges, sizes NPS 3 1/2 (DN 90) and larger are not
covered by ASME/ANSI B16.5.
Includes .06" (1.6 mm) raised face.
These dimensions correspond to inside diameters of pipe as given in
ANSI/ASME B36.10M for Standard Wall Pipe. Thickness of Standard
Wall is the same as Schedule 40 in size NPS 10 (DN 250) and smaller.
•8•
LENGTH THRU HUB 2
LAP
JOINT
MIN.
D
.90
22.9
1.11
28.2
1.38
34.9
1.72
43.7
1.97
50.0
2.46
62.5
2.97
75.4
3.60
91.4
4.10
104.1
4.60
116.8
5.69
144.5
6.75
171.4
8.75
222.2
10.92
277.4
12.92
328.2
14.18
360.2
16.19
411.2
18.20
462.3
20.25
514.3
24.25
615.9
THREADED
COUNTERBORE
MIN.
E
.93
23.5
1.14
29.0
1.41
36.0
1.75
44.5
1.99
50.5
2.50
63.5
3.00
76
3.63
92
4.13
105
4.63
118
5.69
145
6.75
171
8.75
222
10.88
276
12.94
329
14.19
360
16.19
411
18.19
462
20.19
513
24.19
614
WELDING
NECK
F
2.06
52.4
2.25
57.1
2.44
61.9
2.56
65.1
2.69
68.3
2.75
69.8
3.00
76.2
3.12
79.4
3.19
81.0
3.38
85.7
3.88
98.4
3.88
98.4
4.38
111.1
4.62
117.5
5.12
130.2
5.62
142.9
5.75
146.0
6.25
158.7
6.38
161.9
6.62
168.3
SLIP-ON,
THREADED &
SOCK. WELD
G
.88
22
1.00
25
1.06
27
1.06
27
1.19
30
1.31
33
1.50
38
1.69
43
1.75
44
1.88
48
2.00
51
2.06
52
2.44
62
2.62
67
2.88
73
3.00
76
3.25
83
3.50
89
3.75
95
4.19
106
LAP
JOINT
H
.88
22
1.00
25
1.06
27
1.06
27
1.19
30
1.31
33
1.50
38
1.69
43
1.75
44
1.88
48
2.00
51
2.06
52
2.44
62
3.75
95
4.00
102
4.38
111
4.75
121
5.12
130
5.50
140
6.00
152
INCHES
MILLIMETRES
CLASS 300 (PN50)
FLANGES
FORGED STEEL
ASTM A-105
1
ASME/ANSI B16.5
DRILLING
NO. OF
HOLES
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
8
8
12
12
12
12
16
16
16
16
20
20
20
20
24
24
24
24
24
24
DIA. OF
HOLES
J
.62
16
.75
20
.75
.20
.75
20
.88
23
.75
20
.88
23
.88
23
.88
23
.88
23
.88
23
.88
23
1.00
26
1.12
29
1.25
32
1.25
32
1.38
35
1.38
35
1.38
35
1.62
42
DIAMETER OF HUB
DIA. OF
BOLT
CIRCLE
K
2.62
66.7
3.25
82.5
3.50
88.9
3.88
98.4
4.50
114.3
5.00
127.0
5.88
149.2
6.62
168.3
7.25
184.1
7.88
200.0
9.25
234.9
10.62
269.9
13.0
330.2
15.25
387.3
17.75
450.8
20.25
514.3
22.50
571.5
24.75
628.6
27.00
685.80
32.00
812.80
DEPTH1
OF
SOCKET
L
.38
10
.44
11
.50
13
.56
14
.62
16
.69
17
.75
19
.81
21
-
AT
BASE
M
1.50
38.1
1.88
47.6
2.12
53.8
2.50
63.5
2.75
69.9
3.31
84.1
3.94
100.0
4.62
117.5
5.25
133.3
5.75
146.0
7.00
177.8
8.12
206.4
10.25
260.3
12.62
320.7
14.75
374.6
16.75
425.5
19.00
482.6
21.00
533.4
23.12
587.4
27.62
701.7
Socket Welding Flanges, sizes NPS 3 1/2 (DN 90) and larger are not
covered by ASME/ANSI B16.5.
AT
CHAMFER
N
.84
21.4
1.05
26.6
1.32
33.5
1.66
42.1
1.90
48.3
2.38
60.3
2.88
73.0
3.50
88.9
4.00
101.6
4.50
114.3
5.56
141.3
6.63
168.3
8.63
219.1
10.75
273.0
12.75
323.8
14.00
355.6
16.00
406.4
18.00
457.2
20.00
508.0
24.00
609.6
APPROXIMATE WEIGHT
LAP
JOINT
FILLET
RADIUS
r
.12
3
.12
3
.12
3
.19
5
.25
6
.31
8
.31
8
.38
10
.38
10
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
SLIP-ON,
THREADED &
SOCKET
WELDING
WELDING1
NECK
2
2
0.9
0.9
3
3
1.4
1.4
4
3
1.8
1.4
5
4
2.3
1.8
7
6
3.2
2.7
9
7
4.1
3.2
12
10
5.4
4.5
15
13
6.8
5.9
18
17
8.2
7.7
25
22
11.3
10.0
32
28
14.5
12.7
42
39
19.0
17.7
67
58
30.4
26.3
91
81
41.3
36.7
140
115
63.5
52.2
180
165
81.6
74.8
250
190
113
86.2
320
250
145
113
400
315
181
143
580
475
263
215
BLIND
2
0.9
3
1.4
3
1.4
4
1.8
6
2.7
8
3.6
12
5.4
16
7.3
21
9.5
27
12.2
35
15.9
50
22.7
81
36.7
125
56.7
185
83.9
250
113
295
134
395
179
505
229
790
358
LAP
JOINT
2
0.9
3
1.4
3
1.4
4
1.8
6
2.7
7
3.2
10
4.5
13
5.9
17
7.7
22
10.0
28
12.7
39
17.7
58
26.3
91
41.3
140
63.5
190
86.2
250
113
295
134
370
168
550
249
For bevel of Welding Neck, see page 48.
Gasket dimensions - page 20.
Bolting dimensions - page 22.
POUNDS
KILOGRAMS
Flange facing dimensions - page 20.
•9•
For sizes NPS 1/2 (DN 15) through NPS 3 1/2 (DN 90) use Class 600 (PN 100) flanges. 1
BORE
NPS
DN
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
2
FLANGE
OUTSIDE
DIAMETER
O
10
254
11
279
12.5
318
15
381
17.5
445
20.5
520
23
585
25.5
650
28
710
30.5
775
36
915
FLANGE2
THICKNESS
MIN.
T
1.38
35.0
1.50
38.5
1.62
41.5
1.88
48.0
2.12
54.0
2.25
57.5
2.38
60.5
2.5
63.5
2.62
67.0
2.75
70.0
3
76.5
RAISED
FACE
DIA.
A
6.19
157.2
7.31
185.7
8.5
215.9
10.62
269.9
12.75
323.8
15.00
381.0
16.25
412.8
18.50
469.9
21
533.4
23
584.2
27.25
692.2
WELDING
NECK
B
To be
specified
by
purchaser
SLIP-ON,
MIN.
C
4.57
116.1
5.66
143.7
6.72
170.7
8.72
221.5
10.88
276.2
12.88
327.0
14.14
359.2
16.16
410.4
18.18
461.8
20.20
513.1
24.25
616.0
LENGTH TRU HUB 2
LAP
JOINT
MIN.
D
4.60
116.8
5.69
144.5
6.75
171.4
8.75
222.2
10.92
277.4
12.92
328.2
14.18
360.2
16.19
411.2
18.20
462.3
20.25
514.3
24.25
616.0
THREADED
COUNTERBORE
MIN.
E
4.63
118
5.69
145
6.75
171
8.75
222
10.88
276
12.94
329
14.19
360
16.19
411
18.19
462
20.19
513
24.19
614
WELDING
NECK
F
3.5
88.9
4
101.6
4.06
103.2
4.62
117.5
4.88
123.8
5.38
136.5
5.88
149.2
6
152.4
6.5
165.1
6.62
168.3
6.88
174.6
SLIP-ON,
THREADED
G
2
51
2.12
54
2.25
57
2.69
68
2.88
73
3.12
79
3.31
84
3.69
94
3.88
98
4
102
4.5
114
LAP
JOINT
H
2
51
2.12
54
2.25
57
2.69
68
4
102
4.25
108
4.62
117
5
127
5.38
137
5.75
146
6.25
159
Including SOCKET WELDING FLANGES
Does not include .25" (6.4 mm) raised face.
INCHES
• 10 •
MILLIMETRES
CLASS 400 (PN 68)
FLANGES
FORGED STEEL
ASTM A-105
ASME/ANSI B16.5
DRILLING
NO. OF
HOLES
NPS
DN
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
8
8
8
8
12
12
12
12
16
16
16
16
20
20
20
20
24
24
24
24
24
24
DIAMETER
OF
HOLES
J
1
26
1
26
1
26
1.12
29
1.25
32
1.38
35
1.38
35
1.5
39
1.5
39
1.62
42
1.88
48
DIAMETER OF HUB
DIAMETER
OF
BOLT
CIRCLE
K
7.88
200.0
9.25
234.9
10.62
269.9
13.0
330.2
15.25
387.3
17.75
450.8
20.25
514.3
22.5
571.5
24.75
628.7
27
685.8
32
812.8
AT
BASE
M
5.75
146.0
7.0
177.8
8.12
206.4
10.25
260.3
12.62
320.7
14.75
374.7
16.75
425.5
19.0
482.6
21.0
533.4
23.12
587.4
27.62
701.7
AT
CHAMFER
N
4.50
114.3
5.56
141.3
6.63
168.3
8.63
219.1
10.75
273.0
12.75
323.8
14.00
355.6
16.00
406.4
18.00
457.2
20.00
508.0
24.00
609.6
APPROXIMATE WEIGHT
LAP
JOINT
FILLET
RADIUS
r
.44
11
.44
11
.5
13
.5
13
.5
13
.5
13
.5
13
.5
13
.5
13
.5
13
.5
13
WELDING
NECK
35
15.8
43
19
57
25.5
89
40
126
57
177
80
233
105
294
132
360
162
445
200
640
288
SLIP-ON,
THREADED
26
11.7
31
14
44
20
67
30
91
41
129
58
191
86
253
114
310
140
378
170
539
243
BLIND
33
15
44
20
61
27.5
100
45
155
70
226
102
310
140
398
179
502
226
621
279
936
421
LAP
JOINT
25
11.3
29
13
42
19
64
29
112
50
152
68
210
95
280
126
345
155
420
189
615
277
For bevel of Welding Neck, see page 48.
Gasket dimensions - page 20.
Bolting dimensions - page 22.
Flange facing dimensions - page 20.
POUNDS
KILOGRAMS
• 11 •
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
2
FLANGE
OUTSIDE
DIAMETER
O
3.75
95
4.62
117
4.88
124
5.25
133
6.12
156
6.5
165
7.5
191
8.25
210
9.0
229
10.75
273
13.0
330
14.0
356
16.5
419
20.0
510
22.0
560
23.75
605
27.0
685
29.25
745
32.0
815
37.0
940
FLANGE2
THICKNESS
MIN.
T
.56
14.5
.62
16.0
.69
17.5
.81
21.0
.88
22.5
1.0
25.5
1.12
29.0
1.25
32.0
1.38
35.0
1.5
38.5
1.75
44.5
1.88
48.0
2.19
55.5
2.5
63.5
2.62
66.5
2.75
70.0
3.0
76.5
3.25
83.0
3.5
89.0
4.0
102.0
RAISED
FACE
DIA.
A
1.38
34.9
1.69
42.9
2.0
50.8
2.5
63.5
2.88
73.0
3.62
92.1
4.12
104.8
5.0
127.0
5.5
139.7
6.19
157.2
7.31
185.7
8.5
215.9
10.62
269.9
12.75
323.8
15.0
381.0
16.25
412.8
18.5
469.9
21.0
533.4
23.0
584.2
27.25
692.2
WELDING
NECK &
1
SOCKET
WELDING
B
To be
specified
by
purchaser
BORE
SLIP-ON &
1
SOCK. WELD.
SOCKET
MIN.
C
.88
22.2
1.09
27.8
1.36
34.5
1.70
43.3
1.95
49.6
2.44
61.9
2.94
74.6
3.57
90.7
4.07
103.4
4.57
116.1
5.66
143.7
6.72
170.7
8.72
221.5
10.88
276.2
12.88
327.0
14.14
359.2
16.16
410.4
18.18
461.8
20.20
513.1
24.25
615.9
LAP
JOINT
MIN.
D
.90
22.9
1.11
28.2
1.38
34.9
1.72
43.7
1.97
50.0
2.46
62.5
2.97
75.4
3.60
91.4
4.10
104.1
4.60
116.8
5.69
144.5
6.75
171.4
8.75
22.22
10.92
277.4
12.92
328.2
14.18
360.2
16.19
411.2
18.20
462.3
20.25
514.3
24.25
615.9
THREADED
COUNTERBORE
MIN.
E
.93
23.5
1.14
29.0
1.41
36.0
1.75
44.5
1.99
50.5
2.50
63.5
3.00
76.0
3.63
92.0
4.13
105
4.63
118
5.69
145
6.75
171
8.75
222
10.88
276
12.94
329
14.19
360
16.19
411
18.19
462
20.19
513
24.19
614
LENGTH TRU HUB 2
SLIP-ON,
THREADED
1
SOCKET
WELDING
WELDING
NECK
G
F
2.06
.88
52.4
22
2.25
1.00
57.1
25
2.44
1.06
61.9
27
2.62
1.12
66.7
29
2.75
1.25
69.8
32
2.88
1.44
73.0
37
3.12
1.62
79.4
41
3.25
1.81
82.5
46
3.38
1.94
85.7
49
4.0
2.12
101.6
54
4.5
2.38
114.3
60
4.62
2.62
117.3
67
5.25
3.0
133.3
76
6.0
3.38
152.4
86
6.12
3.62
155.6
92
6.5
3.69
165.1
94
7.0
4.19
177.5
106
7.25
4.62
184.1
117
7.5
5.0
190.5
127
8.0
5.5
203.2
140
LAP
JOINT
H
.88
22
1.0
25
1.06
27
1.12
29
1.25
32
1.44
37
1.62
41
1.81
46
1.94
49
2.12
54
2.38
60
2.62
67
3.0
76
4.38
111
4.62
117
5.0
127
5.5
140
6.0
152
6.4
165
7.25
184
Socket Welding Flanges, sizes NPS 3 1/2 (DN 90) and
larger are not covered by ASME/ANSI B16.5.
Does not include .25" (6.4 mm) raised face.
INCHES
• 12 •
MILLIMETRES
CLASS 600 (PN 100)
FLANGES
FORGED STEEL
ASTM A-105
1
ASME/ANSI B16.5
DRILLING
DIAMETER OF HUB
DEPTH
OF
SOCKET
1
NO. OF
HOLES
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
8
8
12
12
12
12
16
16
20
20
20
20
20
20
20
20
24
24
24
24
DIA. OF
HOLES
J
.62
16
.75
20
.75
.20
.75
20
.88
23
.75
20
.88
23
.88
23
1.0
26
1.0
26
1.12
29
1.12
29
1.25
32
1.38
35
1.38
35
1.50
39
1.62
42
1.75
45
1.75
45
2.0
51
DIA. OF
BOLT
CIRCLE
K
2.62
66.7
3.25
82.5
3.5
88.9
3.88
98.4
4.5
114.3
5.0
127.0
5.88
149.2
6.62
168.3
7.25
184.1
8.5
215.9
10.5
266.7
11.5
292.1
13.75
349.2
17.0
431.8
19.25
488.9
20.75
527.0
23.75
603.2
25.75
654.0
28.5
723.9
33.0
838.2
L
.38
10
.44
11
.50
13
.56
14
.62
16
.69
17
.75
19
.81
21
-
AT
BASE
M
1.5
38.1
1.88
47.6
2.12
54.0
2.5
63.9
2.75
69.8
3.31
84.1
3.94
100.0
4.62
117.5
5.25
133.3
6.0
152.4
7.44
188.9
8.75
222.2
10.75
273.0
13.5
342.9
15.75
400.0
17.0
431.8
19.5
495.2
21.5
546.1
24.0
609.6
28.25
717.5
AT
CHAMFER
N
.84
21.4
1.05
26.6
1.32
33.5
1.66
42.1
1.90
48.3
2.38
60.3
2.88
73.0
3.50
88.9
4.00
101.6
4.50
114.3
5.56
141.3
6.63
168.3
8.63
219.1
10.75
273.0
12.75
323.8
14.0
355.6
16.0
406.4
18.0
457.2
20.0
508.0
24.0
609.6
APPROXIMATE WEIGHT
LAP
JOINT
FILLET
RADIUS
r
.12
3
.12
3
.12
3
.19
5
.25
6
.31
8
.31
8
.38
10
.38
10
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
SLIP-ON,
THREADED &
SOCKET
WELDING
WELDING1
NECK
2
2
0.9
0.9
4
3
1.8
1.4
4
4
1.8
1.8
6
5
2.7
2.3
8
7
3.6
3.2
12
9
5.4
4.1
18
13
8.2
5.9
23
16
10.4
7.3
26
21
11.8
9.5
42
37
19.0
16.8
68
63
31.0
28.6
81
80
36.7
36.3
120
115
54.4
52.2
190
170
86.2
77.1
225
200
102
90.7
280
230
127
104
390
330
177
150
475
400
215
181
590
510
268
231
830
730
376
331
BLIND
2
0.9
3
1.4
4
1.8
5
2.3
8
3.6
10
4.5
15
6.8
20
9.1
29
13.2
41
18.6
68
30.8
86
39.0
140
63.5
230
104
295
134
355
161
495
225
630
286
810
367
1250
567
LAP
JOINT
2
0.9
3
1.4
4
1.8
5
2.3
7
3.2
9
4.1
12
5.4
15
6.8
20
9.1
36
16.3
61
27.7
78
35.4
110
49.9
170
77.2
200
90.7
250
113
365
166
435
197
570
259
810
367
For bevel of Welding Neck, see page 48.
Gasket dimensions - page 20.
Bolting dimensions - page 22.
Flange facing dimensions - page 20.
POUNDS
KILOGRAMS
• 13 •
For sizes NPS 1/2 (DN 15) through NPS 2 1/2 (DN 65) use Class 1500 (PN 250) flanges. 1
BORE
NPS
DN
3
80
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
2
FLANGE
OUTSIDE
DIAMETER
O
9.50
241
11.50
292
13.75
349
15.00
381
18.50
470
21.50
545
24.00
610
25.25
640
27.75
705
31.00
785
33.75
855
41.00
1040
FLANGE2
THICKNESS
MIN.
T
1.50
38.5
1.75
44.5
2.0
51.0
2.19
56.0
2.5
63.5
2.75
70.0
3.12
79.5
3.38
86.0
3.5
89.0
4.0
102.0
4.25
108.0
5.5
140.0
RAISED
FACE
DIA.
A
5.00
127.0
6.19
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.8
15.00
381.0
16.25
412.8
18.50
469.9
21.00
533.4
23.00
584.2
27.25
692.2
WELDING
NECK
B
q
To be
specified
by
purchaser
SLIP-ON,
MIN.
C
3.57
90.7
4.57
116.1
5.66
143.7
6.72
170.7
8.72
221.5
10.88
276.2
12.88
327.0
14.14
359.2
16.16
410.4
18.18
461.8
20.20
513.1
24.25
615.9
LENGTH TRU HUB 2
LAP
JOINT
MIN.
D
3.60
91.4
4.60
116.8
5.69
144.5
6.75
171.4
8.75
222.2
10.92
277.4
12.92
328.2
14.18
360.2
16.19
411.2
18.20
462.3
20.25
514.3
24.25
615.9
THREADED
COUNTERBORE
MIN.
E
3.63
92
4.63
118
5.69
145
6.75
171
8.75
222
10.88
276
12.94
329
14.19
360
16.19
411
18.19
462
20.19
513
24.19
614
WELDING
NECK
F
4.00
101.6
4.50
114.3
5.00
127.0
5.50
139.7
67.38
161.9
7.25
184.2
7.88
200.0
8.38
212.7
8.50
215.9
9.00
228.8
9.75
247.6
11.50
292.1
SLIP-ON,
THREADED
G
2.12
54
2.75
70
3.12
79
3.38
86
4.00
102
4.25
108
4.62
117
5.12
130
5.25
133
6.00
152
6.25
159
8.00
203
LAP
JOINT
H
2.12
54
2.75
70
3.12
79
3.38
86
4.50
114
5.00
127
5.62
143
6.12
156
6.50
165
7.50
191
8.25
210
10.50
267
Including SOCKET WELDING FLANGES
Does not include .25" (6.4 mm) raised face.
INCHES
• 14 •
MILLIMETRES
CLASS 900 (PN 150)
FLANGES
FORGED STEEL
ASTM A-105
ASME/ANSI B16.5
For sizes NPS 1/2 (DN 15) through NPS 2 1/2 (DN 65) use Class 1500 (PN 250) flanges. 1
DRILLING
DIAMETER OF HUB
DIAMETER
DIAMETER
OF
NO. OF
AT
OF
AT
BOLT
HOLES
BASE
HOLES
CHAMFER
NPS
CIRCLE
M
J
N
DN
K
3
8
1.00
7.50
5.00
3.50
80
8
26
190.5
127.0
88.9
4
8
1.25
9.25
6.25
4.50
100
8
32
234.9
158.7
114.3
5
8
1.38
11.00
7.50
5.56
125
8
35
279.4
190.5
141.3
6
12
1.25
12.50
9.25
6.63
150
12
32
317.5
234.9
168.3
8
12
1.50
15.50
11.75
8.63
200
12
39
393.7
298.4
219.1
10
16
1.50
18.50
14.50
10.75
250
16
39
469.9
368.3
273.0
12
20
1.50
21.00
16.50
12.75
300
20
39
533.4
419.1
323.8
14
20
1.62
22.00
17.75
14.00
350
20
42
558.8
450.8
355.6
16
20
1.75
24.25
20.00
16.00
400
20
45
615.9
508.0
406.4
18
20
2.00
27.00
22.25
18.00
450
20
51
685.8
565.1
457.2
20
20
2.12
29.50
24.50
20.00
500
20
54
749.3
622.3
508.0
24
20
2.62
35.50
29.5
24.00
600
20
67
901.7
749.3
609.6
APPROXIMATE WEIGHT
LAP
JOINT
FILLET
RADIUS
r
.38
10
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
WELDING
NECK
.31
14.1
51
23.1
86
39.0
110
49.9
175
79.4
260
118
325
147
400
181
495
225
680
308
830
376
1500
680
SLIP-ON,
THREADED
31
14.1
53
24.0
83
37.6
110
49.9
170
77.1
245
111
325
147
400
181
425
193
600
272
730
331
1400
635
BLIND
31
14.1
54
24.5
87
39.5
115
52.2
200
90.7
290
132
415
188
520
236
600
272
850
386
1075
488
2025
918
LAP
JOINT
47
21.3
51
23.1
81
36.7
105
47.6
190
86.2
275
125
370
168
415
188
465
211
650
295
810
367
1550
703
For bevel of Welding Neck, see page 48.
Gasket dimensions - page 20.
Bolting dimensions - page 22.
Flange facing dimensions - page 20.
POUNDS
KILOGRAMS
• 15 •
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
1
2
FLANGE
OUTSIDE
DIAMETER
O
4.75
121
5.12
130
5.88
149
6.25
159
7.00
178
8.50
216
9.62
244
10.50
267
12.25
311
14.75
375
15.50
394
19.00
483
23.00
585
26.50
675
29.50
750
32.50
825
36.00
915
38.75
985
46.00
1170
FLANGE2
THICKNESS
MIN.
T
.88
22.5
1.00
25.5
1.12
29.0
1.12
29.0
1.25
32.0
1.50
38.5
1.62
41.5
1.88
48.0
2.12
54.0
2.88
73.5
3.25
83.0
3.62
92.0
4.25
108.0
4.88
124.0
5.25
133.5
5.75
146.5
6.38
162.0
7.00
178.0
8.00
203.5
RAISED
FACE
DIA.
A
1.38
34.9
1.69
42.9
2.00
50.8
2.50
63.5
2.88
73.0
3.62
92.1
4.12
104.8
5.00
127.0
6.19
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.8
15.00
381.0
16.25
412.8
18.50
469.9
21.00
533.4
23.00
584.2
27.25
692.2
WELDING
NECK &
1
SOCKET
WELDING
B
To be
specified
by
purchaser
BORE
SLIP-ON &
1
SOCK. WELD.
SOCKET
MIN.
C
0.88
22.2
1.09
27.8
1.36
34.5
1.70
43.3
1.95
49.6
2.44
61.9
2.94
74.6
1
LAP
JOINT
MIN.
D
.90
22.9
1.11
28.2
1.38
34.9
1.72
43.7
1.97
50.0
2.46
62.5
2.97
75.4
3.60
91.4
4.60
116.8
5.69
144.5
6.75
171.4
8.75
222.2
10.92
277.4
12.92
328.2
14.18
360.2
16.19
411.2
18.20
462.3
20.25
514.3
24.25
615.9
THREADED
COUNTERBORE
MIN.
E
.93
23.5
1.14
29.0
1.41
36.0
1.75
44.5
1.99
50.5
2.50
63.5
3.00
76.0
3.63
92.0
4.63
118
5.69
145
6.75
171
8.75
222
10.88
276
12.94
329
-
LENGTH TRU HUB 2
1
SLIP-ON,
THREADED,
1
SOCKET
WELDING
WELDING
NECK
G
F
2.38
1.25
60.3
32
2.75
1.38
69.8
35
2.88
1.62
73.0
41
2.88
1.62
73.0
41
3.25
1.75
82.5
44
4.00
2.25
101.6
57
4.12
2.50
104.8
64
4.62
2.88
117.5
73
4.88
3.56
123.8
90
6.12
4.12
155.6
105
6.75
4.69
171.4
119
8.38
5.62
212.7
143
10.00
6.25
254.0
159
11.12
7.12
282.6
181
11.75
298.4
12.25
311.1
12.88
327.0
14.00
355.6
16.00
406.4
-
LAP
JOINT
H
1.25
32
1.38
35
1.62
41
1.62
41
1.75
44
2.25
57
2.50
64
2.88
73
3.56
90
4.12
105
4.69
119
5.62
143
7.00
178
8.62
219
9.50
241
10.25
260
10.88
276
11.50
292
13.00
330
Socket Welding and Slip-on Flanges, size NPS 3 1/2 (DN 80)
and larger are not covered by ASME/ANSI B16.5.
Does not include .25" (6.4 mm) raised face.
INCHES
• 16 •
MILLIMETRES
CLASS 1500 (PN 250)
FLANGES
FORGED STEEL
ASTM A-105
ASME/ANSI B16.5
DRILLING
DIAMETER OF HUB
DEPTH
OF
SOCKET
1
NO. OF
HOLES
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
16
16
16
16
16
16
16
16
DIA. OF
HOLES
J
.88
23
.88
23
1.00
26
1.00
26
1.12
29
1.00
26
1.12
29
1.25
32
1.38
35
1.62
42
1.50
39
1.75
45
2.00
51
2.12
54
2.38
61
2.62
67
2.88
74
3.12
80
3.62
92
DIA. OF
BOLT
CIRCLE
K
3.25
82.5
3.50
88.9
4.00
101.6
4.38
111.1
4.88
123.8
6.50
165.1
7.50
190.5
8.00
203.2
9.50
241.3
11.50
292.1
12.50
317.5
15.50
393.7
19.00
482.6
22.50
571.5
25.00
635.0
27.75
704.8
30.50
774.7
32.75
831.8
39.00
990.6
L
.38
10
.44
11
.50
13
.56
14
.62
16
.69
17
.75
19
-
AT
BASE
M
1.50
38.1
1.75
44.4
2.06
52.4
2.50
63.5
2.75
69.8
4.12
104.8
4.88
123.8
5.25
133.3
6.38
161.9
7.75
196.8
9.00
228.6
11.50
292.1
14.50
368.3
17.75
450.6
19.50
495.3
21.75
552.4
23.50
569.9
25.25
641.3
30.00
762.0
AT
CHAMFER
N
.84
21.4
1.05
26.6
1.32
33.5
1.66
42.1
1.90
48.3
2.38
60.3
2.88
73.0
3.50
88.9
4.50
114.3
5.56
141.3
6.63
168.3
8.63
219.1
10.75
273.0
12.75
323.8
14.00
355.6
16.00
406.4
18.00
457.2
20.00
508.0
24.00
609.6
APPROXIMATE WEIGHT
LAP
JOINT
FILLET
RADIUS
r
.12
3
.12
3
.12
3
.19
5
.25
6
.31
8
.31
8
.38
10
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
1
SLIP-ON,
THREADED &
1
SOCKET
WELDING
WELDING
NECK
5
4
2.3
1.8
6
5
2.7
2.3
9
8
4.1
3.6
10
9
4.5
4.1
13
12
5.9
5.4
25
25
11.3
11.3
36
36
16.3
16.3
48
48
21.8
21.8
73
73
33.1
33.1
130
130
59.0
59.0
165
165
75
75
275
260
125
118
455
435
206
197
690
580
313
263
940
426
1250
567
1625
737
2050
930
3325
1510
-
BLIND
4
1.8
6
2.7
8
3.6
9
4.1
13
5.9
25
11.3
35
15.9
48
21.8
73
33.1
140
63.5
160
72.6
300
136
510
231
690
313
975
442
1300
590
1750
795
2225
1010
3625
1644
LAP
JOINT
4
1.8
5
2.3
8
3.6
9
4.1
12
5.4
25
11.3
35
16.0
47
21.3
75
34.0
140
63.5
170
77.1
285
129
485
220
630
286
890
404
1150
522
1475
669
1775
805
2825
1326
For bevel of Welding Neck, see page 48.
Gasket dimensions - page 20.
Bolting dimensions - page 22.
Flange facing dimensions - page 20.
POUNDS
KILOGRAMS
• 17 •
BORE
SLIP-ON2 &
SOCK. WELD.2
SOCKET
MIN.
C
0.88
22.2
1.09
27.8
1.36
34.5
1.70
43.3
1.95
49.6
2.44
61.9
2.94
74.6
3.57
90.7
4.57
116.1
5.66
143.7
6.72
170.7
8.72
221.5
10.88
276.2
12.88
327.0
WELDING
NECK &
SOCKET2
WELDING
B
FLANGE
RAISED
LAP
OUTSIDE
FACE
JOINT
FLANGE1
NPS
DIAMETER THICKNESS
DIA.
MIN.
T
DN
O
A
D
1/2
5.25
1.19
1.38
.90
15
133
30.5
34.9
22.9
3/4
5.50
1.25
1.69
1.11
20
140
32.0
42.9
28.2
1
6.25
1.38
2.00
1.38
25
159
35.0
50.8
34.9
1 1/4
7.25
1.50
2.50
1.72
32
184
38.5
63.5
43.7
1 1/2
8.00
1.75
2.88
1.97
40
203
44.5
73.0
50.0
2
9.25
2.00
3.62
2.46
To be
50
235
51.0
92.1
62.5
2 1/2
10.50
2.25
4.12
2.97
specified
65
267
57.5
104.8
75.4
3
12.00
2.62
5.00
3.60
by
80
305
67.0
127.0
91.4
4
14.00
3.00
6.19
4.60
purchaser
100
356
76.5
157.2
116.8
5
16.50
3.62
7.31
5.69
125
419
92.5
185.7
144.5
6
19.00
4.25
8.50
6.75
150
483
108.0
215.9
171.4
8
21.75
5.00
10.62
8.75
200
552
127.0
269.9
222.2
10
26.50
6.50
12.75
10.92
250
675
165.5
323.8
277.4
12
30.00
7.25
15.00
12.92
300
760
184.5
381.0
328.2
1
Dimensions do not include .25" (6.4 mm) raised face.
2
Class 2500 (PN 420) Socket Welding and Slip-on Flanges not covered by ANSI B16.5
THREADED
COUNTERBORE
MIN.
E
0.93
23.5
1.14
29.0
1.41
36.0
1.75
44.5
1.99
50.5
2.50
63.5
3.00
76
3.63
92
4.63
118
5.69
145
6.75
171
8.75
222
10.88
276
12.94
329
LENGTH TRU HUB 1
SLIP-ON2
THREADED
SOCKET2
WELDING
WELDING
NECK
G
F
2.88
1.56
73.0
40
3.12
1.69
79.4
43
3.50
1.88
88.9
48
3.75
2.06
95.2
52
4.38
2.38
111.4
60
5.00
2.75
127.0
70
5.62
3.12
142.9
79
6.62
3.62
168.2
92
7.50
4.25
190.5
108
9.00
5.12
228.6
130
10.75
6.0
273.0
152
12.50
7.0
317.5
178
16.50
9.0
419.4
229
18.25
10.0
463.6
254
LAP
JOINT
H
1.56
40
1.69
43
1.88
48
2.06
52
2.38
60
2.75
70
3.12
79
3.62
92
4.25
108
5.12
130
6.0
152
7.0
178
9.0
229
10.0
254
REDUCING FLANGES ASME/ANSI B16.5 —
Hub dimensions shall be at least as large as those of the
standard flanges of the size to which the reduction is being
made, except that flanges reduced to a size smaller than
those shown in the accompanying table may be used
without hubs.
For threaded flanges, tapped smaller than the reduced size
in the table, Blind Flanges may be used.
Flange thickness, outside diameter, drilling template and
facing dimensions, shall be the same as those of a
standard flange of the nominal pipe size from which the
reduction is being made.
Reducing flanges are specified by giving firstly the size
from which the reduction is made, followed by the reduced
size.
Example: NPS 6 x 4 Class 300 reducing threaded flange.
(DN 150 x 100, PN 50 reducing threaded flange.)
INCHES
• 18 •
MILLIMETRES
CLASS 2500 (PN 420)
FLANGES*
FORGED STEEL
ASTM A-105
1
ASME/ANSI B16.5
DRILLING
NO. OF
HOLES
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
4
100
5
125
6
150
8
200
10
250
12
300
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
8
8
12
12
12
12
12
12
DIA. OF
HOLES
J
.88
23
.88
23
1.00
26
1.12
29
1.25
32
1.12
29
1.25
32
1.38
35
1.62
42
1.88
48
2.12
54
2.12
54
2.62
67
2.88
74
DIAMETER OF HUB
DIA. OF
BOLT
CIRCLE
K
3.50
88.9
3.75
95.2
4.25
107.9
5.12
130.2
5.75
146.0
6.75
171.4
7.75
196.8
9.00
228.6
10.75
273.0
12.75
323.8
14.50
368.3
17.25
438.1
21.25
539.7
24.38
619.1
DEPTH
OF
2
SOCKET
AT
BASE
M
1.69
42.9
2.00
50.8
2.25
57.1
2.88
73.0
3.12
79.4
3.75
95.2
4.50
114.3
5.25
133.3
6.50
165.1
8.00
203.2
9.25
234.9
12.00
304.8
14.75
374.8
17.38
441.3
L
.38
10
.44
11
.50
13
.56
14
.62
16
.69
17
.75
19.0
-
AT
CHAMFER
N
.84
21.4
1.05
26.6
1.32
33.5
1.66
42.1
1.90
48.3
2.38
60.3
2.88
73.0
3.50
88.9
4.50
114.3
5.56
141.3
6.63
168.3
8.63
219.1
10.75
273.0
12.75
323.8
APPROXIMATE WEIGHT
LAP
JOINT
FILLET
RADIUS
r
.12
3
.12
3
.12
3
.19
5
.25
6
.31
8
.31
8
.38
10
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
SLIP-ON,2
THREADED &
SOCKET2
WELDING
WELDING
NECK
7
7
3.2
3.2
8
8
3.6
3.6
12
11
5.4
5.0
17
16
7.7
7.3
25
22
11.3
10
42
38
19.0
17.2
52
55
23.6
24.9
94
83
42.6
37.6
145
125
65.8
56.7
245
210
111
95.3
380
325
172
147
580
485
263
220
1075
930
488
422
1525
1100
692
499
BLIND
7
3.2
8
3.6
11
5.0
17
7.7
23
10.4
39
17.7
56
25.4
86
39
135
61.2
225
102
345
156
530
240
1025
465
1300
590
LAP
JOINT
7
3.2
8
3.6
11
5.0
16
7.3
22
10
37
16.8
53
24
80
36.3
120
54.4
205
93.0
315
143
470
213
900
408
1100
499
* Class 2500 (PN 420) Socket Welding and Slip-on Flanges are not covered by ASME/ANSI B16.5.
Bevel of Welding Neck, see page 48
Flange facing and gasket dimensions, see page 20.
Bolting dimensions, see page 22.
CLASS 150 — 2500 (PN 20 - 420)
Nominal
Pipe Size
1
1 1/4
1 1/2
2
2 1/2
3
DN
Smallest Size of
Reducing Outlet
Requiring Hub Flanges
Nominal
Pipe Size
DN
25
32
40
50
65
80
1/2
1/2
1/2
1
1 1/4
1 1/4
3 1/2
4
5
6
8
10
90
100
125
150
200
250
POUNDS
KILOGRAMS
Smallest Size of
Reducing Outlet
Requiring Hub Flanges
1
1
1
2
3
3
1/2
1/2
1/2
1/2
1/2
1/2
Nominal
Pipe Size
DN
Smallest Size of
Reducing Outlet
Requiring Hub Flanges
12
14
16
18
20
24
300
350
400
450
500
600
3 1/2
3 1/2
4
4
4
4
Reducing Flanges are generally supplied as Slip-on or Threaded; however Reducing Welding Neck flanges are available
by special order.
• 19 •
FLANGE
FACING
AND
GASKET
DIMENSIONS
RAISED FACE, FLAT FACE, LAP JOINT
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
24
GASKET DIMENSIONS
CL. 150
1.88
48
2.25
57
2.62
67
3.00
76
3.38
86
4.12
105
4.88
124
5.38
137
6.38
162
6.88
175
7.75
197
8.75
222
11.00
279
13.38
340
16.12
410
17.75
451
20.25
515
21.62
550
23.88
605
28.25
718
CL. 300
2.12
54
2.62
67
2.88
73
3.25
83
3.75
95
4.38
111
5.12
130
5.88
149
6.50
165
7.12
181
8.50
216
9.88
251
12.12
308
14.25
362
16.62
422
19.12
486
21.25
540
23.50
595
25.75
655
30.5
775
FLAT RING TYPE GASKET
(EXTENDING TO INSIDES OF BOLTS)
OUTSIDE DIAMETER
CL. 400
CL. 600
CL. 900
2.12
2.12
2.50
54
54
64
2.62
2.62
2.75
67
67
70
2.88
2.88
3.12
73
73
79
3.25
3.25
3.50
83
83
89
3.75
3.75
3.88
95
95
98
4.38
4.38
5.62
111
111
143
5.12
5.12
6.50
130
130
165
5.88
5.88
6.62
149
149
168
6.38
6.38
162
162
7.00
7.62
8.12
178
194
206
8.38
9.50
9.75
213
241
248
9.75
10.50
11.38
248
267
289
12.00
12.62
14.12
305
321
359
14.12
15.75
17.12
359
400
435
16.50
18.00
19.62
419
457
498
19.00
19.38
20.50
483
492
520
21.12
22.25
22.62
537
565
575
23.38
24.12
25.12
595
615
640
25.50
26.88
27.50
648
685
700
30.25
31.12
33.00
770
790
839
CL. 1500
2.50
64
2.75
70
3.12
79
3.50
89
3.88
98
5.62
143
6.50
165
6.88
175
8.25
210
10.00
254
11.12
2.83
13.88
352
17.12
435
20.50
520
22.75
580
25.25
640
27.75
705
29.75
755
35.50
902
CL. 2500
2.75
70
3.00
76
3.38
86
4.12
105
4.62
117
5.75
146
6.62
168
7.75
197
9.25
235
11.00
279
12.50
318
15.25
387
18.75
476
21.62
550
-
FULL
FACE
TYPE
OUTSIDE
DIAMETER
FLAT RING
OR FULL
FACE
TYPES
INSIDE
DIAMETER
Same as flange outside diameter, see pages 6 - 19.
1/2
Same as flange outside diameter, see pages 6 - 19.
NPS
*FLANGE FACING
RAISED
FACE,
FLAT
LAP JOINT
FACE
O. DIA.
O. DIA.
DN
A
O
1.38
15
35
1.69
20
43
2
25
51
2.5
32
64
2.88
40
73
3.62
50
92
4.12
65
105
5
80
127
5.5
90
140
6.19
100
157
7.31
125
185
8.5
150
216
10.62
200
270
12.75
250
324
15
300
381
16.25
350
413
18.5
400
470
51
21
450
533
23
500
584
27.25
600
692
0.84
21
1.06
27
1.31
33
1.66
42
1.91
49
2.38
60
2.88
73
3.5
89
4
102
4.5
114
5.56
141
6.62
168
8.62
219
10.75
273
12.75
324
14
356
16
407
18
457
20
508
24
610
Gasket Facing is indicated on the facing drawings by “GF”.
Dimensions conform to ASME/ANSI B16.5 and ANSI B16.21, where applicable.
*
A tolerance of ±0.16" (0.44 mm) is allowed on the inside and outside diameters of all facings.
∆
For Ring Joint dimensions see page 30.
INCHES
• 20 •
MILLIMETRES
FLANGE
FACING
AND
GASKET
DIMENSIONS
MALE & FEMALE,
TONGUE & GROOVE
*FLANGE FACINGS DIMENSIONS
OUTSIDE DIAMETER
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
LARGE
MALE;
LARGE
TONGUE
SMALL
MALE
A
1.38
35
1.69
43
2.00
51
2.50
64
2.88
73
3.62
92
4.12
105
5.00
127
5.50
140
6.19
157
7.31
185
8.50
216
10.62
270
12.75
324
15.0
381
16.25
413
18.5
470
21.0
533
23.0
584
27.25
692
B
0.72
18.3
.94
23.8
1.19
30.2
1.5
38.1
1.75
44.4
2.25
57.2
2.69
68.3
3.31
84.1
3.81
96.8
4.31
109.5
5.38
136.5
6.38
161.9
8.38
212.7
10.5
266.7
12.5
317.5
13.75
349.2
15.75
400.0
17.75
450.9
19.75
501.7
23.75
603.3
SMALL
TONGUE
LARGE
FEMALE;
LARGE
GROOVE
SMALL
FEMALE
C
1.38
35.0
1.69
42.9
1.88
47.6
2.25
57.2
2.50
63.5
3.25
82.6
3.75
95.2
4.62
117.5
5.12
130.2
5.69
144.5
6.81
173.0
8.00
203.2
10.00
254.0
12.00
304.8
14.25
362.0
15.50
393.7
17.62
447.7
20.12
511.2
22.0
558.8
26.25
666.8
D
1.44
36.5
1.75
44.5
2.06
52.4
2.56
65.1
2.94
74.6
3.69
93.7
4.19
106.4
5.06
128.6
5.56
141.3
6.25
158.8
7.38
187.3
8.56
217.5
10.69
271.5
12.81
325.4
15.06
382.6
16.31
414.3
18.56
471.5
21.06
535.0
23.06
585.8
27.41
693.7
E
0.78
19.9
1.00
25.4
1.25
31.8
1.56
39.7
1.81
46.0
2.31
58.7
2.75
69.9
3.38
85.7
3.88
98.4
4.38
111.1
5.44
138.1
6.44
163.5
8.44
214.3
10.56
268.3
12.56
319.1
13.81
350.8
15.81
401.6
17.81
452.4
19.81
503.2
23.81
604.8
INSIDE DIAMETER
LARGE
LARGE
LARGE
TONGUE; GROOVE; MALE &
SMALL
SMALL
SMALL FEMALE.
LARGE OR
GROOVE TONGUE GROOVE LARGE
SMALL
SMALL
LARGE
SMALL
TONGUE & MALE & TONGUE & MALE & TONGUE &
F
G
H
GROOVE FEMALE GROOVE FEMALE GROOVE
1.44
1.00
0.94
1.38
0.72
1.38
0.84
1.00
36.5
25.4
23.8
35
18.3
35.0
21
25
1.75
1.31
1.25
1.69
.94
1.69
1.06
1.31
44.4
33.3
31.8
43
23.8
42.9
27
33
1.94
1.5
1.44
2.00
1.19
1.88
1.31
1.50
49.2
38.1
36.5
51
30.2
47.6
33
38
2.31
1.88
1.81
2.50
1.50
2.25
1.66
1.88
58.7
47.6
46.0
64
38.1
57.2
42
48
2.56
2.12
2.06
2.88
1.75
2.50
1.91
2.12
65.1
54.0
52.4
73
44.4
63.5
49
54
3.31
2.88
2.81
3.62
2.25
3.25
2.38
2.88
84.1
73.0
71.4
92
57.2
82.6
60
73
3.81
3.38
3.31
4.12
2.69
3.75
2.88
3.38
96.8
85.7
84.1
105
68.3
95.2
73
86
4.69
4.25
4.19
5.00
3.31
4.62
3.5
4.25
119.1
108.0
106.4
127
84.1
117.5
89
108
5.19
4.75
4.69
5.50
3.81
5.12
4
4.75
131.8
120.6
119.1
140
96.8
130.2
102
121
5.75
5.19
5.12
6.19
4.31
5.69
4.5
5.19
146.0
131.8
130.2
157
109.5
144.5
114
132
6.88
6.31
6.25
7.31
5.38
6.81
5.56
6.31
174.6
160.3
158.8
185
136.5
173.0
141
161
8.06
7.5
7.44
8.50
6.38
8.00
6.62
7.50
204.8
190.5
188.9
216
161.9
203.2
168
191
10.06
9.38
9.31
10.62
8.38
10.00
8.62
9.38
255.6
238.1
236.5
270
212.7
254.0
219
238
12.06
11.25
11.19
12.75
10.50
12.00
10.75
11.25
306.4
285.8
284.2
324
266.7
304.8
273
286
14.31
13.5
13.44
15.00
12.50
14.25
12.75
13.50
363.5
342.9
341.3
381
317.5
362.0
324
343
15.56
14.75
14.69
16.25
13.75
15.50
14
14.75
395.3
374.6
373.1
413
349.2
393.7
356
375
17.69
16.75
16.69
18.50
15.75
17.62
16
16.75
449.3
425.4
423.9
470
400.0
447.7
407
426
20.19
19.25
19.19
21.00
17.75
20.12
18
19.25
512.8
489.0
487.4
533
450.9
511.2
457
489
22.06
21.0
20.94
23.00
19.75
22.0
20
21.00
560.4
533.4
531.8
584
501.7
558.8
510
535
26.31
25.25
25.19
27.25
23.75
26.25
24
25.25
668.3
641.4
639.8
692
603.3
666.8
610
640
Gasket Facing is indicated on the facing drawings by “GF”.
*
A tolerance of ±0.16" (0.44 mm) is allowed on the inside and outside diameters of all facings.
Dimensions conform to ASME/ANSI B16.5 and ANSI B16.21, where
INCHES
applicable.
MILLIMETRES
GASKET DIMENSIONS
OUTSIDE DIAMETER
INSIDE DIAMETER
• 21 •
∆
For Ring Joint dimensions see page 30.
BOLT AND
STUD
DIMENSIONS*
CONTINUED ON PAGE 23
CLASS 150 (PN 20) FLANGES
LENGTH
NPS
DN
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
2 1/2
65
3
80
3 1/2
90
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
*
NO. OF
BOLTS
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
20
20
20
20
STUD BOLTS
.06
DIA. OF
1.6
BOLTS RAISED RING
(inches) FACE
JOINT
1/2
2.50
1/2
65
1/2
2.50
1/2
65
1/2
2.75
3.25
1/2
70
85
1/2
2.75
3.25
1/2
70
85
1/2
3.00
3.50
1/2
75
90
5/8
3.25
3.75
5/8
85
95
5/8
3.50
4.00
5/8
90
100
5/8
3.75
4.25
5/8
95
110
5/8
3.75
4.25
5/8
95
110
5/8
3.75
4.25
5/8
95
110
3/4
4.00
4.50
3/4
100
115
3/4
4.00
4.50
3/4
100
115
3/4
4.25
4.75
3/4
110
120
7/8
4.75
5.25
7/8
120
135
7/8
4.75
5.25
7/8
120
135
1
5.25
4.75
1
135
145
1
5.50
6.00
1
140
155
1 1/8
6.00
6.50
1 1/8
150
165
1 1/8
6.25
6.75
1 1/8
160
175
1 1/4
7.00
7.50
1 1/4
180
190
CLASS 300 (PN 50) FLANGES
LENGTH
MACHINE
BOLTS
.06
1.6
RAISED NO. OF
BOLTS
FACE
2.00
4
50
4
2.25
4
55
4
2.25
4
55
4
2.50
4
65
4
2.50
4
65
4
2.75
8
70
8
3.00
8
75
8
3.25
8
85
8
3.25
8
85
8
3.25
8
85
8
3.25
8
85
8
3.50
12
90
12
3.75
12
95
12
4.00
16
100
16
4.25
16
110
16
4.50
20
115
20
4.75
20
120
20
5.00
24
125
24
5.50
24
140
24
6.00
24
155
24
STUD BOLTS
.06
DIA. OF
1.6
BOLTS RAISED RING
(inches) FACE
JOINT
1/2
2.75
3.00
1/2
70
75
5/8
3.00
3.50
5/8
75
90
5/8
3.25
3.75
5/8
85
95
5/8
3.25
3.75
5/8
85
95
3/4
3.75
4.25
3/4
95
110
5/8
3.50
4.25
5/8
90
110
3/4
4.00
4.75
3/4
100
120
3/4
4.25
5.00
3/4
110
125
3/4
4.50
5.25
3/4
115
135
3/4
4.50
5.25
3/4
115
135
3/4
4.75
5.50
3/4
120
140
3/4
5.00
5.75
3/4
130
145
7/8
5.50
6.25
7/8
140
160
1
6.25
7.00
1
160
180
1 1/8
6.75
7.50
1 1/8
175
190
1 1/8
7.00
7.75
1 1/8
180
195
1 1/4
7.50
8.25
1 1/4
190
210
1 1/4
7.75
8.50
1 1/4
195
215
1 1/4
8.25
9.00
1 1/4
210
230
1 1/2
9.25
10.25
1 1/2
235
260
CLASS 400 (PN 64) FLANGES
MACHINE
BOLTS
.06
1.6
RAISED
FACE
2.25
55
2.50
6.5
2.75
70
2.75
70
3.00
75
3.00
75
3.50
90
3.75
95
3.75
95
4.00
100
4.25
110
4.25
110
4.75
120
5.50
140
6.00
155
6.25
160
6.50
165
6.75
175
7.25
185
8.00
205
LENGTH OF
STUD BOLTS
NO. OF
BOLTS
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
8
8
12
12
12
12
16
16
16
16
20
20
20
20
24
24
24
24
24
24
MALE &
.25
FEMALE
DIA. OF
6.4
BOLTS RAISED TONGUE &
(inches) FACE GROOVE
1/2
3.25
3.00
1/2
85
75
5/8
3.50
3.25
5/8
90
85
5/8
3.75
3.50
5/8
95
90
5/8
4.00
3.75
5/8
100
95
3/4
4.25
4.00
3/4
110
100
5/8
4.25
4.00
5/8
110
100
3/4
4.75
4.50
3/4
120
115
3/4
5.00
4.75
3/4
130
120
7/8
5.50
5.25
7/8
140
135
7/8
5.50
5.25
7/8
140
135
7/8
5.75
5.50
7/8
145
140
7/8
6.00
5.75
7/8
155
145
1
6.75
6.50
1
175
165
1 1/8
7.50
7.25
1 1/8
190
185
1 1/4
8.00
7.75
1 1/4
205
195
1 1/4
8.25
8.00
1 1/4
210
205
1 3/8
8.75
8.50
1 3/8
225
215
1 3/8
9.00
8.75
1 3/8
230
225
1 1/2
9.75
9.50
1 1/2
250
240
1 3/4 10.75 10.50
1 3/4
275
265
Length of Stud Bolt does not include the height of the points.
Bolt sizes are in inches.
Length of Male & Female and Tongue & Groove Stud Bolts are .25" (6.4 mm) less than those for the same size of .25"
(6.4 mm) Raised Face Stud Bolts.
• 22 •
RING
JOINT
3.00
75
3.50
90
3.75
95
4.00
100
4.25
110
4.50
115
5.00
130
5.25
135
5.75
145
5.75
145
6.00
155
6.25
160
7.00
180
7.75
195
8.25
210
8.50
215
9.00
230
9.25
235
10.00
255
11.25
285
INCHES
MILLIMETRES
BOLT AND
STUD
DIMENSIONS
CONTINUED
CLASS 600 (PN 100) FLANGES
LENGTH OF
STUD BOLTS
NPS
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
24
DIA. OF
NO. OF BOLTS
DN BOLTS (inches)
4
1/2
15
4
1/2
4
5/8
20
4
5/8
4
5/8
25
4
5/8
4
5/8
32
4
5/8
4
3/4
40
4
3/4
8
5/8
50
8
5/8
8
3/4
65
8
3/4
8
3/4
80
8
3/4
8
7/8
90
8
7/8
8
7/8
100
8
7/8
8
1
125
8
1
12
1
150
12
1
12
1 1/8
200
12
1 1/8
16
1 1/4
250
16
1 1/4
20
1 1/4
300
20
1 1/4
20
1 3/8
350
20
1 3/8
20
1 1/2
400
20
1 1/2
20
1 5/8
450
20
1 5/8
24
1 5/8
500
24
1 5/8
24
1 7/8
600
24
1 7/8
*
INCHES
MILLIMETRES
.25
6.4
RAISED
FACE
3.25
85
3.50
90
3.75
95
4.00
100
4.25
110
4.25
110
4.75
120
5.00
130
5.50
140
5.75
145
6.50
165
6.75
175
7.75
195
8.50
215
8.75
225
9.25
235
10.00
255
10.75
275
11.50
295
13.00
330
RING
JOINT
3.00
75
3.50
90
3.75
95
4.00
100
4.25
110
4.50
115
5.00
125
5.25
135
5.75
145
6.00
155
6.75
175
7.00
180
7.75
195
8.75
225
9.00
230
9.50
240
10.25
260
11.00
280
11.75
300
13.25
335
CLASS 900 (PN 150) FLANGES
LENGTH OF
STUD BOLTS
DIA. OF
NO. OF BOLTS
BOLTS (inches)
4
3/4
4
3/4
4
3/4
4
3/4
4
7/8
4
7/8
4
7/8
4
7/8
4
1
4
1
8
7/8
8
7/8
8
1
8
1
8
7/8
8
7/8
8
1 1/8
8
1 1/8
8
1 1/4
8
1 1/4
12
1 1/8
12
1 1/8
12
1 3/8
12
1 3/8
16
1 3/8
16
1 3/8
20
1 3/8
20
1 3/8
20
1 1/2
20
1 1/2
20
1 5/8
20
1 5/8
20
1 7/8
20
1 7/8
20
2
20
2
20
2 1/2
20
2 1/2
.25
6.4
RAISED
FACE
4.25
110
4.50
115
5.00
125
5.00
125
5.50
140
5.75
145
6.25
160
5.75
145
6.75
175
7.50
190
7.75
195
8.75
225
9.25
235
10.00
255
10.75
275
11.25
285
12.75
325
13.50
345
17.25
440
RING
JOINT
4.25
110
4.50
115
5.00
125
5.00
125
5.50
140
5.75
145
6.25
160
6.00
155
7.00
180
7.75
195
7.75
195
9.00
230
9.50
240
10.25
260
11.25
285
11.75
300
13.50
345
14.25
360
18.00
455
CLASS 1500 (PN 250) FLANGES
LENGTH OF
STUD BOLTS
CLASS 2500 (PN 420) FLANGES
LENGTH OF
STUD BOLTS
.25
.25
DIA. OF
6.4
DIA. OF
6.4
NO. OF BOLTS RAISED RING NO. OF BOLTS RAISED
BOLTS (inches) FACE
JOINT BOLTS (inches) FACE
4
3/4
4.25
4.25
4
3/4
5.25
4
3/4
110
110
4
3/4
135
4
3/4
4.50
450
4
3/4
5.25
4
3/4
115
115
4
3/4
135
4
7/8
5.00
5.00
4
7/8
5.75
4
7/8
125
125
4
7/8
145
4
7/8
5.00
5.00
4
1
6.25
4
7/8
125
125
4
1
160
4
1
5.50
5.50
4
1 1/8
7.00
4
1
140
140
4
1 1/8
180
8
7/8
5.75
5.75
8
1
7.25
8
7/8
145
145
8
1
185
8
1
6.25
6.25
8
1 1/8
8.00
8
1
160
160
8
1 1/8
205
8
1 1/8
7.00
7.00
8
1 1/4
9.00
8
1 1/8
180
180
8
1 1/4
230
8
1 1/4
7.75
7.75
8
1 1/2 10.25
8
1 1/4
195
195
8
1 1/2
260
8
1 1/2
9.75
9.75
8
1 3/4 12.00
8
1 1/2
250
250
8
1 3/4
305
12
1 3/8 10.25 10.50
8
2
13.75
12
1 3/8
260
265
8
2
350
12
1 5/8 11.50 12.00
12
2
15.25
12
1 5/8
295
305
12
2
390
12
1 7/8 13.25 13.75
12
2 1/2 19.50
12
1 7/8
335
350
12
2 1/2
495
16
2
14.75 15.50
12
2 3/4 21.50
16
2
375
395
12
2 3/4
545
16
2 1/4 16.00 17.00
16
2 1/4
405
430
16
2 1/2 17.50 18.50
16
2 1/2
445
470
16
2 3/4 19.50 20.50
16
2 3/4
495
520
16
3
21.50 22.50
16
3
545
570
16
3 1/2 24.50 25.75
16
3 1/2
620
655
RING
JOINT
5.25
135
5.25
135
5.75
145
6.50
165
7.25
185
7.50
190
8.25
210
9.25
235
10.75
275
12.75
325
14.50
370
16.00
405
20.50
520
22.50
570
Length of Stud Bolt does not include the height of the points
Bolt sizes are in inches.
Length of Male & Female and Tongue & Groove Stud Bolts are .25" (6.4 mm) less than those for the same size of .25"
(6.4 mm) Raised Face Stud Bolts.
• 23 •
BORE
FLANGE
THICKNESS
RAISED
RING
FACE
JOINT
T
T
∆
LENGTH TRU HUB
WELDING NECK
SLIP-ON AND THREADED
∆
NPS
DN
1
25
1 1/4
■
■
32
1 1/2
40
2
50
2 1/2
65
3
80
4
100
5
■
■
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
FLANGE
OUTSIDE
DIAMETER
O
4.88
124
5.25
133
6.12
156
6.50
165
7.50
191
8.25
210
10.0
254
11.0
279
12.5
318
15.0
381
17.5
445
20.5
520
23.0
585
25.5
650
28.0
710
30.5
775
36.0
915
1.50
38.5
1.50
38.5
1.50
38.5
1.50
38.5
1.50
38.5
1.50
38.5
1.50
38.5
1.50
38.5
1.50
38.5
1.62
41.5
1.88
48.0
2.00
51.0
2.12
54.0
2.25
57.5
2.38
60.5
2.50
63.5
2.75
70.0
1.25
32.0
1.25
32.0
1.25
32.0
1.25
32.0
1.25
32.0
1.25
32.0
1.25
32.0
1.38
35.0
1.44
36.5
1.62
41.5
1.88
48.0
2.00
51.0
2.12
54.0
2.25
57.5
2.38
60.5
2.50
63.5
2.75
70.0
RAISED
WELDING
FACE
NECK
DIAMETER
A
B
CLASS 300 (PN 50)
2.00
50.80
2.50
63.50
2.88
73.05
3.62
92.10
4.12
104.80
5.00
127.00
6.19
157.20
7.31
185.70
8.50
215.90
10.62
269.90
12.75
323.90
15.00
381.00
16.25
412.80
18.50
469.90
21.00
533.40
23.00
584.20
27.25
692.20
1.05
26.6
1.38
35.1
1.61
40.9
2.07
52.5
2.47
62.7
3.07
77.9
4.03
102.3
5.05
128.2
6.07
154.1
7.98
202.7
10.02
254.5
12.00
304.8
13.25
336.6
15.25
387.4
17.25
438.2
19.25
489.0
23.25
590.6
C
RAISED
FACE
F
RING
JOINT
F
RAISED
FACE
G
RING
JOINT
G
1.36
34.5
1.70
43.2
1.95
49.5
2.44
62.0
2.94
74.5
3.57
90.5
4.57
116.0
5.66
143.8
6.72
171.0
8.72
221.0
10.88
276.0
12.88
327.0
14.14
359.0
16.16
410.0
18.18
462.0
20.20
513.0
24.25
616.0
3.25
82.6
3.31
84.1
3.38
85.8
3.38
85.8
3.50
88.9
3.50
88.9
3.62
92.1
4.00
101.6
3.94
100.0
4.38
111.2
4.62
117.5
5.12
130.2
5.62
142.9
5.75
146.1
6.25
158.8
6.38
162.0
6.62
168.3
3.00
76.2
3.06
77.8
3.12
79.4
3.12
79.4
3.25
82.6
3.25
82.6
3.38
85.7
3.88
98.4
3.88
98.4
4.38
111.1
4.62
117.5
5.12
130.2
5.62
142.9
5.75
146.1
6.25
158.8
6.38
161.9
6.62
168.3
1.88
48
1.81
46
1.88
48
1.94
49
2.00
51
2.06
52
2.12
54
2.12
54
2.12
54
2.44
62
2.62
67
2.88
73
3.00
76
3.25
83
3.50
89
3.75
95
4.19
106
1.62
41.3
1.56
39.7
1.62
41.3
1.69
42.9
1.75
44.5
1.81
46.0
1.88
47.6
2.00
50.8
2.06
52.4
2.44
61.9
2.62
66.7
2.88
73.0
3.00
76.2
3.25
82.6
3.50
88.9
3.75
95.3
4.19
106.4
SLIP-ON
#ASME/ANSI B16.36 does not cover Class 300 Threaded Orifice Flanges in sizes above NPS 8 (DN 200).
■ Not included in ASME/ANSI B16.36.
*Details of Ring Joint facings are given on page 30.
FOR FURTHER DETAILS, REFER TO PAGE 4 “OTHER TYPES”.
∆ 0.06" (1.6 mm) Raised Face is included in Flange Thickness T, and length through Hub, F & G.
INCHES
• 24 •
MILLIMETRES
CLASS 300 (PN 50)
FORGED
ORIFICE FLANGES
ASTM A-105
ASME/ANSI B16.36
DRILLING
NPS
DN
1
25
1 1/4
■
■
32
1 1/2
40
2
50
2 1/2
65
3
80
4
100
5
■
■
125
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
24
600
BOLTING
LENGTH
NO. OF
HOLES
DIA. OF
HOLES
DIA. OF
BOLT
CIRCLE
BOLT
DIA.
(inches)
RAISED
FACE
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
12
12
12
12
16
16
16
16
20
20
20
20
24
24
24
24
24
24
0.69
18
0.69
17.5
0.81
18
0.69
18
0.81
21
0.81
21
0.81
21
0.88
23
0.88
23
1.00
26
1.12
29
1.25
32
1.25
32
1.38
35
1.38
35
1.38
35
1.62
42
3.50
89
3.88
99
4.50
114
5.00
127
5.88
149
6.62
168
7.88
200
9.25
235
10.62
270
13.00
330
15.25
387
17.75
451
20.25
514
22.50
572
24.75
629
27.00
686
32.00
813
5/8
5/8
5/8
5/8
3/4
3/4
5/8
5/8
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
4.00
102
4.00
102
4.25
108
4.00
102
4.25
108
4.25
108
4.25
108
4.25
108
4.25
108
4.50
115
5.50
140
5.50
140
6.00
153
6.50
165
6.50
165
7.00
178
7.50
191
AT
BASE
RING
M
JOINT
CLASS 300 (PN 50)
4.75
2.12
121
54.0
4.75
2.50
121
63.5
5.00
2.75
127
70
4.75
3.31
120
84
5.00
3.94
127
100
5.00
4.62
127
117
5.00
5.75
127
146
5.50
7.00
140
178
5.50
8.12
140
206
6.00
10.25
153
260
6.50
12.62
165
321
7.00
14.75
178
375
7.00
16.75
178
425.5
8.00
19.00
204
483
8.00
21.00
204
535
8.00
23.12
204
585
9.00
27.62
229
700
The tapped metering holes are drilled as follows:
1/2" for sizes NPS 4 (DN 100) and over
3/8" for sizes NPS 3 (DN 80)
1/4" for sizes NPS 1 1/2 (DN 65) and under.
POUNDS
KILOGRAMS
DIAMETER
OF HUB
• 25 •
APPROXIMATE WEIGHT
WELDING
NECK
SLIP-ON AND
THREADED
AT
CHAMFER
N
RAISED
FACE
RING
JOINT
RAISED
FACE
RING
JOINT
1.32
33.5
1.66
42.2
1.90
48.5
2.38
60.5
2.88
73.0
3.50
89.0
4.50
114.0
5.56
141.2
6.63
168.0
8.63
219.0
10.75
273.0
12.75
324.0
14.00
356.0
16.00
406.0
18.00
457.0
20.00
508.0
24.00
610.0
18
8
21
9.5
28
12.5
33
15
43
19.5
48
21.5
68
30.5
78
35
100
45
155
70
220
99
330
149
425
191
590
266
750
338
910
410
1350
608
20
9
23
10.5
30
13.5
36
16
46
21
52
23.5
73
33
89
40
115
52
180
81
255
115
380
171
485
218
660
297
830
374
1025
461
1500
675
15
7
17
7.5
24
11
27
12
36
16
42
19
60
27
69
31
94
42.5
135
61
200
90
280
125
395
178
465
209
610
275
740
336
1125
510
17
7.5
20
9
28
13
31
14
42
19
48
22
66
30
80
36
110
50
160
73
230
104
325
147
450
204
535
243
690
313
840
381
1300
590
CLASS 400 (PN 68)
†
BORE
FLANGE
THICKNESS
RAISED
RING
FACE
JOINT
T
T
1.38
1.38
35.0
35.0
1.50
1.50
38.5
38.1
1.62
1.62
41.5
41.5
1.88
1.88
48.0
48.0
2.12
2.12
54.0
54.0
2.25
2.25
57.5
57.5
∆
LENGTH TRU HUB
WELDING NECK
SLIP-ON AND THREADED
∆
NPS
DN
4
100
5
■
■
125
6
150
8
200
10
250
12
300
FLANGE
OUTSIDE
DIAMETER
O
10
254
11
279
12.5
318
15
381
17.5
445
20.5
520
RAISED
FACE
DIAMETER
A
6.19
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.9
15.00
381.0
WELDING
NECK
B
As
specified
by
purchaser
SLIP-ON
C
4.57
116.1
5.66
143.8
6.72
170.7
8.72
221.5
10.88
276.4
12.88
327.2
RAISED
FACE
F
3.5
88.9
4.0
101.6
4.06
103.2
4.62
117.5
4.88
123.5
5.38
136.5
RING
JOINT
F
3.5
88.9
4
101.6
4.06
103.2
4.62
117.4
4.88
123.8
5.38
136.5
RAISED
FACE
G
2
50.8
2.12
54.0
2.25
57.2
2.69
68.3
2.88
73.0
3.12
79.4
RING
JOINT
G
2
50.8
2.12
54.0
2.25
57.2
2.69
68.3
2.88
73.0
3.12
79.4
CLASS 600 (PN 100)
†
BORE
FLANGE
THICKNESS
RAISED
RING
FACE
JOINT
T
T
1.50
1.50
38.5
38.1
1.75
1.75
44.5
44.5
1.88
1.88
48.0
48.0
2.19
2.19
56.0
56.0
2.50
2.50
63.5
63.5
2.62
2.62
67.0
67.0
∆
LENGTH TRU HUB
WELDING NECK
SLIP-ON AND THREADED
∆
NPS
DN
4
100
5
■
■
125
6
150
8
200
10
250
12
300
FLANGE
OUTSIDE
DIAMETER
O
10.75
273
13.00
330
14.00
356
16.50
419
20.00
510
22.00
560
RAISED
FACE
DIAMETER
A
6.19
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.9
15.00
381.0
WELDING
NECK
B
As
specified
by
purchaser
SLIP-ON
C
4.57
116.1
5.66
143.8
6.72
170.7
8.72
221.5
10.88
276.4
12.88
327.2
RAISED
FACE
F
4.00
101.6
4.50
114.3
4.62
117.5
5.25
133.4
6.00
152.4
6.12
155.6
RING
JOINT
F
4.00
101.6
4.50
114.3
4.62
117.5
5.25
133.4
6.00
152.4
6.12
155.6
RAISED
FACE
G
2.12
54.0
2.38
60.5
2.62
66.7
3.00
76.2
3.38
85.7
3.62
92.1
RING
JOINT
G
2.12
54.0
2.38
60.5
2.62
66.7
3.00
76.2
3.38
85.7
3.62
92.1
∆ .25" (6.4 mm) Raised Face s not included in Flange Thickness T, and Length through Hub F & G.
† Flanges size NPS 3 (DN80) and smaller are identical to Class 300 flanges, except for bolting steel specifications, compliance with which then
permits their use for these higher Class ratings.
■ Not covered by ASME/ANSI B16.36.
# Welding Neck Orifice Flanges in sizes NPS 14 through 24 (DN 350 through 600), as covered by ASME/ANSI B16.36, are available upon
application.
*
Details of Ring Joint facings are given on page 30.
FOR FURTHER DETAILS, REFER TO PAGE 4 “OTHER TYPES”.
INCHES
• 26 •
MILLIMETRES
CLASS 400 (PN 68)
CLASS 600 (PN 100)
FORGED
#
ORIFICE FLANGES
ASTM A-105
ASME/ANSI B16.36
ASME/ANSI B16.36a
DRILLING
NPS
DN
4
100
5
■
■
125
6
150
8
200
10
250
12
300
BOLTING
LENGTH
DN
4
100
5
■
■
125
6
150
8
200
10
250
12
300
APPROXIMATE WEIGHT
WELDING
NECK
SLIP-ON AND
SCREWED
NO. OF
HOLES
DIA. OF
HOLES
DIA. OF
BOLT
CIRCLE
BOLT
DIA.
(inches)
RAISED
FACE
RING
JOINT
AT
BASE
M
AT
CHAMFER
N
RAISED
FACE
RING
JOINT
RAISED
FACE
RING
JOINT
8
8
8
8
12
12
12
12
16
16
16
16
1
26
1
26
1
26
1.12
29
1.25
32
1.38
35
7.88
200.0
9.25
235.0
10.62
269.7
13.0
330.2
15.25
387.3
17.75
450.8
7/8
7/8
7/8
7/8
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
5.5
140
5.75
146
6.25
159
6.75
172
7.5
191
8.0
205
6.0
153
6.25
159
6.5
165
7.25
185
8.0
204
8.5
216
5.75
146.1
7.0
177.8
8.12
206.4
10.25
260.4
12.62
320.7
14.75
374.6
4.50
114.3
5.56
141.2
6.63
168.4
8.63
219.2
10.75
273.1
12.75
323.8
83
37
99
45
135
61
205
90
300
135
420
189
92
41.5
110
50
145
65
225
101
325
146
445
200
65
29
75
34
110
50
165
74
235
106
330
149
74
33.5
85
38
120
54
180
81
255
115
355
160
DRILLING
NPS
DIAMETER
OF HUB
BOLTING
LENGTH
DIAMETER
OF HUB
APPROXIMATE WEIGHT
WELDING
NECK
SLIP-ON AND
THREADED
NO. OF
HOLES
DIA. OF
HOLES
DIA. OF
BOLT
CIRCLE
BOLT
DIA.
(inches)
RAISED
FACE
RING
JOINT
AT
BASE
M
AT POINT
OF WELDING
N
RAISED
FACE
RING
JOINT
RAISED
FACE
RING
JOINT
8
8
8
8
12
12
12
12
16
16
20
20
1.00
26
1.13
29
1.13
29
1.25
32
1.38
35
1.38
35
8.50
216
10.50
267
11.50
292
13.75
349
17.00
432
19.25
489
7/8
7/8
1
1
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
6.00
152
5.50
140
7.00
178
7.75
197
8.75
222
9.00
229
6.5
165
7.00
178
7.5
191
8.25
210
9.25
235
9.5
241
6.00
152
7.44
189
8.75
222
10.75
273
13.50
343
15.75
400
4.50
114
5.56
141
6.63
168
8.63
219
10.75
273
12.75
324
97
44
115
52
195
89
285
129
450
204
540
245
110
50
170
77
210
95
305
138
485
220
580
263
87
39
145
66
190
86
275
125
410
186
490
222
98
44
160
72
205
92
295
133
445
200
530
239
The tapped metering holes are drilled as follows:
1/2" for sizes NPS 4 (DN 100) and over.
POUNDS
KILOGRAMS
• 27 •
CLASS 900 (PN 150)
For sizes 2 1/2 and smaller, use Class 1500 (PN 250)
BORE
FLANGE
THICKNESS
RAISED
RING
FACE
JOINT
T
T
1.50
1.50
38.5
38.5
1.75
1.75
44.5
44.5
2.00
2.00
51.0
51.0
2.19
2.19
56.0
56.0
2.50
2.50
63.5
63.5
2.75
2.75
70.0
70.0
3.12
3.12
79.5
79.5
∆
LENGTH THRU HUB
WELDING NECK
SLIP-ON AND THREADED
∆
NPS
DN
3
80
4
100
5
■
■
125
6
150
8
200
10
250
12
300
FLANGE
OUTSIDE
DIAMETER
O
9.50
241
11.50
292
13.75
350
15.00
381
18.50
470
21.50
546
24.00
610
RAISED
FACE
DIAMETER
A
5.00
127.0
6.19
157.2
7.31
185.7
8.50
215.9
10.63
270.0
12.75
323.9
15.00
381.0
WELDING
NECK
B
As
specified
by
purchaser
2
SLIP-ON
C
3.57
90.7
4.57
116.1
5.66
143.8
6.72
170.7
8.72
221.5
10.88
276.4
12.88
327.2
RAISED
FACE
F
4.00
101.6
4.50
114.3
5.00
127.0
5.50
139.7
6.38
161.9
7.25
184.2
7.88
200.0
RING
JOINT
F
4.00
101.6
4.50
114.3
5.00
127
5.50
139.7
6.38
161.9
7.25
184.2
7.88
200.0
RAISED
FACE
G
2.12
54.0
2.75
70.0
3.12
79.4
3.38
85.7
4.00
101.6
4.25
108.0
4.62
117.5
RING
JOINT
G
2.12
54.0
2.75
70.0
3.12
79.4
3.38
85.7
4.00
101.6
4.25
108.0
4.62
117.5
CLASS 1500 (PN 250)
†
BORE
NPS
DN
1
25
1 1/4
■
■
32
1 1/2
40
2
50
2 1/2
65
3
80
4
100
5
■
■
125
6
150
8
200
10
250
12
300
FLANGE
OUTSIDE
DIAMETER
O
5.88
149
6.25
159
7.00
178
8.50
216
9.62
245
10.50
267
12.25
312
14.75
375
15.50
394
19.00
483
23.00
585
26.50
675
FLANGE
THICKNESS
RAISED
RING
FACE
JOINT
T
T
1.50
1.50
38.5
38.5
1.38
1.38
34.9
34.9
1.50
1.50
38.5
38.5
1.50
1.50
38.5
38.5
1.62
1.62
41.5
41.5
1.88
1.88
48.0
48.0
2.12
2.12
54.0
54.0
2.88
2.88
73.0
73.0
3.25
3.25
83.0
83.0
3.62
3.62
92.5
92.5
4.25
4.25
108.0
108.0
4.88
4.88
124.0
124.0
RAISED
FACE
DIAMETER
A
2.00
50.8
2.50
63.5
2.88
73.0
3.62
92.1
4.12
104.8
5.00
127.0
6.19
157.2
7.31
185.7
8.50
215.9
10.62
269.9
12.75
323.9
15.00
381.0
Sizes NPS 14 (DN 350) and larger, on application.
Class 2500 (PN 400) Welding Neck Orifice Flanges, NPS 1 through 12 (DN
25 through 300), as covered by ASME/ANSI B16.36 are available upon
application.
■ Not covered by ASME/ANSI B16.36.
WELDING
NECK
B
As
specified
by
purchaser
#
†
*
• 28 •
LENGTH THRU HUB
WELDING NECK
SLIP-ON AND THREADED
SLIP-ON
C
1.36
34.5
1.70
43.2
1.95
49.5
2.44
62.0
2.94
74.7
3.57
90.7
4.57
116.1
5.66
143.8
6.72
170.7
8.72
221.5
10.88
276.4
12.88
327.2
RAISED
FACE
F
3.25
82.55
2.88
73.15
3.50
88.90
4.00
101.6
4.12
104.8
4.62
117.5
4.88
123.8
6.12
155.6
6.75
171.4
8.38
212.7
10.00
254.0
11.12
282.6
RING
JOINT
F
3.25
82.55
2.88
73.15
3.50
88.90
4.00
101.6
4.12
104.8
4.62
117.5
4.88
123.8
6.12
155.6
6.75
171.4
8.38
212.7
10.00
254.0
11.12
282.6
RAISED
FACE
G
1.88
47.6
1.88
47.6
1.88
47.6
2.25
57.2
2.50
63.5
2.88
73.0
3.56
90.5
4.12
104.8
4.69
119.1
5.62
142.9
6.25
158.8
7.12
181.0
RING
JOINT
G
1.75
44.5
1.75
44.5
1.75
44.5
2.25
57.2
2.50
63.5
2.88
73.0
3.56
90.4
4.12
104.8
4.69
119.1
5.62
142.9
6.25
158.8
7.12
181.0
Details of Ring Joint facings are given on page 30.
FOR FURTHER DETAILS, REFER TO PAGE 4 “OTHER TYPES”.
∆ 0.25" (6.4 mm) Raised Face is not included in Flange Thickness T, and
Length through Hub F & G.
CLASS 900 (PN 150)
CLASS 1500 (PN 250)
FORGED
†
ORIFICE FLANGES
ASTM A-105
ASME/ANSI B16.36
DRILLING
NPS
DN
BOLT
DIA.
(inches)
RAISED
FACE
RING
JOINT
AT
BASE
M
AT POINT
OF WELDING
N
RAISED
FACE
RING
JOINT
RAISED
FACE
RING
JOINT
8
8
8
8
8
8
12
12
12
12
16
16
20
20
1.00
26
1.25
32
1.38
36
1.25
32
1.50
39
1.50
39
1.50
39
7.50
191
9.25
235
11.00
279
12.50
318
15.50
394
18.50
470
21.00
533
7/8
7/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
6.0
153
7.00
178
7.50
191
7.75
197
9.00
229
9.5
241
10.25
260
6.5
165
7.5
191
8.00
204
8.25
210
9.5
241
10.0
254
10.75
273
5.00
127
6.25
159
7.50
191
9.25
235
11.75
298
14.50
368
16.50
419
3.50
89.0
4.50
114.0
5.56
141.3
6.63
168.0
8.63
219.0
10.75
273.0
12.75
324.0
75
34
125
57
205
93
260
118
420
191
610
277
760
345
84
38
140
64
225
102
290
132
450
204
660
299
820
372
65
30
130
59
200
91
260
118
410
186
580
263
760
345
74
33
145
65
215
97
285
128
435
196
620
279
820
360
100
■
125
6
150
8
200
10
250
12
300
DRILLING
DN
SLIP-ON AND
THREADED
BOLT
DIA.
(inches)
RAISED
FACE
RING
JOINT
AT
BASE
M
AT POINT
OF WELDING
N
RAISED
FACE
RING
JOINT
RAISED
FACE
RING
JOINT
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
1.00
26
1.00
26
1.12
29
1.00
26
1.12
29
1.25
32
1.38
35
1.62
42
1.50
39
1.75
45
2.00
51
2.12
54
4.00
102
4.38
111
4.88
124
6.50
165
7.50
191
8.00
203
9.50
241
11.50
292
12.50
318
15.50
394
19.00
483
22.50
572
7/8
7/8
7/8
7/8
1
1
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 1/2
1 1/2
1 3/8
1 3/8
1 5/8
1 5/8
1 7/8
1 7/8
2
2
6.00
153
5.50
140
6.25
159
6.00
153
6.50
165
7.25
185
8.00
204
9.75
248
10.50
267
11.75
299
13.50
343
15.00
381
6.25
159
5.75
147
6.50
166
6.50
166
7.00
178
7.75
197
8.50
216
10.25
261
11.00
280
12.50
318
14.25
362
16.00
407
2.06
52
2.50
64
2.75
70
4.12
105
4.88
124
5.25
133
6.38
162
7.75
197
9.00
229
11.50
292
14.50
368
17.75
451
1.32
33.5
1.66
42.2
1.90
48.5
2.38
60.5
2.88
73.0
3.50
89.0
4.50
114.0
5.56
141.0
6.63
168.0
8.63
219.0
10.75
273.0
12.75
324.0
29
13
31
14
38
17
63
29
90
41
120
54
180
82
320
145
405
184
630
286
1100
499
1675
760
28
13
31
14
40
18
72
33
100
45
135
61
195
88
345
157
440
200
730
331
1175
533
1825
828
26
12
29
13
36
16
63
29
90
41
120
54
180
82
320
145
405
184
600
272
1050
476
1475
664
26
12
29
13
38
17
71
32
100
45
135
61
195
88
340
153
435
196
680
305
1125
506
1550
698
■
32
40
2
50
2 1/2
65
3
80
4
100
■
■
APPROXIMATE WEIGHT
WELDING
NECK
DIA. OF
BOLT
CIRCLE
1 1/2
5
DIAMETER
OF HUB
DIA. OF
HOLES
25
■
BOLTING
LENGTH
NO. OF
HOLES
1
1 1/4
SLIP-ON AND
THREADED
DIA. OF
BOLT
CIRCLE
4
NPS
APPROXIMATE WEIGHT
WELDING
NECK
DIA. OF
HOLES
80
■
DIAMETER
OF HUB
NO. OF
HOLES
3
5
BOLTING
125
6
150
8
200
10
250
12
300
FOR FURTHER DETAILS, REFER TO PAGE 4 “OTHER TYPES”.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
• 29 •
The tapped metering holes are drilled as follows:
1/2" for sizes NPS 4 (DN 100) and over.
3/8" for sizes NPS 3 (DN 80).
1/4" for sizes NPS 2 1/2 (DN 65) and under.
RING
JOINT
DIMENSIONS
ENLARGED
SECTION OF
GROOVE
ASME/ANSI B16.5
NOMINAL PIPE SIZE
CLASS
PN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
1
2
3
4
150
20
300
50
1/2
15
400
64
2
600
100
1/2
15
900
160
3
GROOVE DIMENSIONS
1500
250
2500
400
1/2
15
3/4
20
3/4
20
1/2
15
3/4
20
1
25
1
25
1
25
1
25
3/4
20
1 1/4
32
1 1/4
32
1 1/4
32
1 1/4
32
1
25
1 1/2
40
1 1/2
40
1/2
40
1 1/2
40
1 1/4
32
2
50
2
50
2
50
1 1/2
40
2
50
2 1/2
65
2 1/2
65
2 1/2
65
2
50
2 1/2
65
2 1/2
65
3
80
(1)
(1)
3 (1)
80
(1)
(1)
3 (1)
80
3
80
3
80
RING
NUMBER
R11
R11
R12
R12
R13
R13
R14
R14
R15
R15
R16
R16
R17
R17
R18
R18
R19
R19
R20
R20
R21
R21
R22
R22
R23
R23
R24
R24
R25
R25
R26
R26
R27
R27
R28
R28
R29
R29
R30
R30
R31
R31
R32
R32
PITCH
DIA.
P
1.344
34.14
1.562
39.67
1.688
42.88
1.750
44.45
1.875
47.62
2.000
50.80
2.250
57.15
2.375
60.32
2.562
65.07
2.688
68.28
2.844
72.24
3.250
82.55
3.250
82.55
3.750
95.25
4.000
101.60
4.000
101.60
4.250
107.95
4.375
111.12
4.500
114.30
4.625
117.48
4.875
123.82
5.000
127.00
DIAMETER OF RAISED FACE K
BOTT.
DEPTH WIDTH RADIUS
E4
0.219
5.56
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.312
7.92
0.250
6.35
0.312
7.92
0.312
7.92
0.250
6.35
0.312
7.92
0.312
7.92
0.375
9.52
0.250
6.35
0.312
7.92
0.312
7.92
0.375
9.52
F
0.281
7.14
0.344
8.74
0.344
8.74
0.344
8.74
0.344
8.74
0.344
8.74
0.344
8.74
0.344
8.74
0.344
8.74
0.344
8.74
0.469
11.91
0.344
8.74
0.469
11.91
0.469
11.91
0.344
8.74
0.469
11.91
0.469
11.91
0.531
13.49
0.344
8.74
0.469
11.91
0.469
11.91
0.531
13.49
R
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.06
1.5
.03
.8
.03
.8
.03
.8
.06
1.5
300
150 400,600
20 50,64,100
2
51.0
900
160
1500
250
2500
400
2.38
60.5
2.5
63.5
2.56
65.0
2.62
66.5
2.50
63.5
2.75
70.0
2.81
71.5
2.88
73.0
3.12
79.5
3.19
81.0
3.25
82.5
3.56
90.5
3.62
92.0
2.88
73.0
3.25
82.5
4
102
4
102
4.25
108
4.5
114
4.88
124
4.75
121
5
127
5.25
133
5.38
137
5.88
149
5.25
133
5.75
146
6.12
156
6.62
168
TOLERANCES
E (depth) + 0.16 (+ 0.40 mm) - 0.00 (-0.00 mm)
F (width) ± 0.008 (±0.20 mm)
P (pitch) ± 0.005 (± 0.13 mm)
R (radius) Max.
23˚ (angle) ± 1/2˚
For NPS 3 (DN 80) Lap Joint Stub Ends (ASME/ASNI B16.9) Class 300 &
600 (PN 50 & 100), Ring Number R30 is used instead of R31.
For sizes NPS 1/2 - NPS 3 1/2 (DN 15 - DN 90), use same data as Class
600 (PN 100).
For sizes NPS 1/2 - NPS 2 1/2 (DN 15 - DN 65) use same data as Class
1500 (PN 250).
Height of raised portion is equal to the depth of groove dimensions “E” but is
not subjected to the tolerance for “E”. Former full-face contour may be used.
INCHES
• 30 •
MILLIMETRES
RING JOINT DIMENSIONS continued
NOMINAL PIPE SIZE
CLASS
PN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
150
20
3 1/2
90
300
50
400
64
2
3 1/2
90
600
100
900
160
3
GROOVE DIMENSIONS
1500
250
2500
400
3 1/2
90
3
80
4
100
4
100
4
100
4
100
4
100
4
100
4
100
5
125
5
125
5
125
5
125
5
125
5
125
6
150
5
125
6
150
6
150
6
150
6
150
6
150
6
150
8
200
8
200
8
200
8
200
8
200
8
200
8
200
10
250
10
250
10
250
10
250
10
250
10
250
10
250
RING
NUMBER
R33
R33
R34
R34
R35
R35
R36
R36
R37
R37
R38
R38
R39
R39
R40
R40
R41
R41
R42
R42
R43
R43
R44
R44
R45
R45
R46
R46
R47
R47
R48
R48
R49
R49
R50
R50
R51
R51
R52
R52
R53
R53
R54
R54
R55
R55
PITCH
DIA.
P
5.188
131.78
5.188
131.78
5.375
136.52
5.875
149.22
5.875
149.22
6.188
157.18
6.375
161.92
6.750
171.45
7.125
180.98
7.500
190.50
7.625
193.68
7.625
193.68
8.312
211.12
8.312
211.12
9.000
228.60
9.750
247.65
10.625
269.88
10.625
269.88
11.000
279.40
12.000
304.80
12.750
323.85
12.750
323.85
13.500
342.90
FOR FOOTNOTES, REFER TO PAGE 30
BOTT.
DEPTH WIDTH RADIUS
E4
0.250
6.35
0.312
7.92
0.312
7.92
0.250
6.35
0.312
7.92
0.438
11.13
0.312
7.92
0.250
6.35
0.312
7.92
0.500
12.70
0.250
6.35
0.312
7.92
0.312
7.92
0.375
9.52
0.500
12.70
0.250
6.35
0.312
7.92
0.438
11.13
0.562
14.27
0.250
6.35
0.312
7.92
0.438
11.13
0.688
17.48
F
0.344
8.74
0.469
11.91
0.469
11.91
0.344
8.74
0.469
11.91
0.656
16.66
0.469
11.91
0.344
8.74
0.469
11.91
0.781
19.84
0.344
8.74
0.469
11.91
0.469
11.91
0.531
13.49
0.781
19.84
0.344
8.74
0.469
11.91
0.656
16.66
0.906
23.01
0.344
8.74
0.469
11.91
0.656
16.66
1.188
30.18
R
.03
.8
.03
.8
.03
.8
.03
.8
.03
.8
.06
1.5
.03
.8
.03
.8
.03
.8
.06
1.5
.03
.8
.03
.8
.03
.8
.06
1.5
.06
1.5
.03
.8
.03
.8
.06
1.5
.06
1.5
.03
.8
.03
.8
.06
1.5
.09
2.4
300
150 400,600
20 50,64,100
6.06
154
6.25
159
900
160
1500
250
2500
400
6.62
168
6.75
171
6.88
175
7.12
181
8
203
7.62
194
7.62
194
8.25
210
8.5
216
9.5
241
8.62
219
9
229
9.5
241
9.5
241
9.75
248
11
279
10.75
273
11.88
302
12.12
308
12.5
318
13.38
340
13
330
14
356
14.25
362
14.62
371
16.75
425
CONTINUED ON PAGE 32
INCHES
MILLIMETRES
DIAMETER OF RAISED FACE K
• 31 •
RING JOINT
DIMENSIONS
ENLARGED
SECTION OF
GROOVE
continued
NOMINAL PIPE SIZE
CLASS
PN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
NPS
DN
150
20
12
300
300
50
12
300
400
64
2
12
300
600
100
12
300
900
160
3
GROOVE DIMENSIONS
1500
250
2500
400
12
300
12
300
14
350
12
300
14
350
14
350
14
350
14
350
14
350
16
400
16
400
16
400
16
400
16
400
16
400
18
450
18
450
18
450
18
450
18
450
18
450
20
500
20
500
20
500
20
500
20
500
20
500
24
600
24
600
24
600
24
600
24
600
24
600
RING
NUMBER
R56
R56
R57
R57
R58
R58
R59
R59
R60
R60
R61
R61
R62
R62
R63
R63
R64
R64
R65
R65
R66
R66
R67
R67
R68
R68
R69
R69
R70
R70
R71
R71
R72
R72
R73
R73
R74
R74
R75
R75
R76
R76
R77
R77
R78
R78
R79
R79
PITCH
DIA.
P
15.000
381.00
15.000
381.00
15.000
381.00
15.625
396.88
16.000
406.40
16.500
419.10
16.500
419.10
16.500
419.10
17.875
454.02
18.500
469.90
18.500
469.90
18.500
469.90
20.375
517.52
21.000
533.40
21.000
533.40
21.000
533.40
22.000
558.80
23.000
584.20
23.000
584.20
23.000
584.20
26.500
673.10
27.250
692.15
27.250
692.15
27.250
692.15
DIAMETER OF RAISED FACE K
BOTT.
DEPTH WIDTH RADIUS
E
0.250
6.35
0.312
7.92
0.562
14.27
0.250
6.35
0.688
17.48
0.312
7.92
0.438
11.13
0.625
15.88
0.250
6.35
0.312
7.92
0.438
11.13
0.688
17.48
0.250
6.35
0.312
7.92
0.500
12.70
0.688
17.48
0.250
6.35
0.375
9.52
0.500
12.70
0.688
17.48
0.250
6.35
0.438
11.13
0.625
15.88
0.812
20.62
4
F
0.344
8.74
0.469
11.91
0.906
23.01
0.344
8.74
1.312
33.32
0.469
11.91
0.656
16.66
1.062
26.97
0.344
8.74
0.469
11.91
0.656
16.66
1.188
30.18
0.344
8.74
0.469
11.91
0.781
19.84
1.188
30.18
0.344
8.74
0.531
13.49
0.781
19.84
1.312
33.32
0.344
8.74
0.656
16.66
1.062
26.97
1.438
36.53
R
.03
.8
.03
.8
.06
1.5
.03
.8
.09
2.4
.03
.8
.06
1.5
.09
2.4
.03
.8
.03
.8
.06
1.5
.09
2.4
.03
8
.03
8
.06
1.5
.09
2.4
.03
.8
.06
1.5
.06
1.5
.09
2.4
.03
.8
.06
1.5
.09
2.4
.09
2.4
300,
150 400,600
20 50,64,100
16
406
16.25
413
900
160
1500
250
2500
400
16.5
419
17.25
438
16.75
425
19.5
495
18
457
18.38
467
19.25
489
19
483
20
508
20.62
524
21.5
546
21.5
546
22.62
575
23.38
594
24.12
613
23.5
597
25
635
25.5
648
26.5
673
28
711
29.5
749
30.38
772
31.25
794
FOR FOOTNOTES, REFER TO PAGE 30
INCHES
• 32 •
MILLIMETRES
LONG
WELDING
NECKS
NOMINAL
SIZE
AND
BORE
B
1.00
25.4
1.25
31.8
1.50
38.1
2.00
50.8
2.50
63.5
3.00
76.2
3.50
88.9
4.00
101.6
5.00
127.0
6.00
152.4
8.00
203.2
10.00
254.0
12.00
304.8
14.00
355.6
16.00
406.4
18.00
457.2
20.00
508.0
24.00
609.6
LENGTH THRU HUB
CLASS 150
CLASS 900
THRU 600
THRU 2500
PN
PN
20 THRU 100
160 THRU 400
F
F
9
9
229
229
9
9
229
229
9
9
229
229
9
9
229
229
9
12
229
305
9
12
229
305
9
229
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
12
12
305
305
WEIGHTS
HUB
DIAMETER
CLASS 150
PN 20
*M
2.00
50.8
2.38
60.3
2.62
66.7
3.25
82.6
3.75
95.3
4.25
108.0
4.88
123.8
5.50
139.7
6.50
165.1
7.75
196.9
9.75
247.7
12.00
304.8
14.38
365.1
16.00
406.4
18.00
457.2
20.00
508.0
22.00
558.8
26.25
666.8
CLASS
150
PN 20
CLASS
300
PN 50
CLASS
400
PN 64
CLASS
600
PN 100
CLASS
900
PN 160
CLASS
1500
PN 250
CLASS
2500
PN 400
8
3.6
10
4.5
12
5.5
17
7.7
22
10
26
12
32
14.5
47
21.5
58
26.5
77
35
103
47
144
66
207
94
212
96
250
114
274
125
314
143
426
194
10
4.5
14
6.5
17
7.7
19
9
28
13
36
16.5
45
20.5
54
24.5
86
39
108
49
150
68
218
99
289
131
342
155
426
193
493
224
575
261
823
374
11
5
14
6.5
17
7.7
21
9.5
29
13
38
17.5
48
21.5
67
30
90
41
115
52
160
72
230
104
301
136
357
161
443
199
513
231
602
271
856
385
11
5
14
6.5
17
7.7
21
9.5
29
13
38
17.5
48
22
80
36.5
128
58
158
72
215
98
343
156
409
186
432
196
564
256
654
297
840
381
1100
499
15
7
18
8
23
10.5
44
20
72
32.5
65
29.5
98
44
143
65
199
90
310
140
356
161
541
244
568
256
670
302
949
427
1040
468
1775
799
15
7
18
8
23
10.5
44
20
72
32.5
84
38
118
53
195
88
235
106
366
165
594
268
872
393
1030
464
1335
601
1750
788
2130
959
3180
1431
20
9
30
13.5
38
17
55
25
85
38.5
125
57
185
84
300
135
450
203
600
270
1045
471
1420
639
-
SPECIFICATIONS: Long Welding Necks conform to ASTM
specification A-105. Except as shown above, Long Welding Necks
conform dimensionally to ASME/ANSI Standard B16.5.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
*Dimension “M” is given here for Class 150 (PN 20) Long Welding
Necks only. For Class 300 (PN 50) and higher pressure ratings,
outside diameter of the neck is the same as dimension “M” of ANSI
flanges of comparable pressure rating (see pages 8 to 18).
Facing and Finish: see page 4.
Gasket dimensions: see page 20.
Bolting dimensions: see page 22.
• 33 •
LARGE DIAMETER
FORGED STEEL FLANGES
CLASS 125 LW1
SLIP-ON FLANGES2
ASTM A181 CLASS 60
3
DRILLING
NPS
DN
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
50
52
1300
54
1400
60
1500
66
72
1800
84
96
2400
1
2
3
4
FLANGE
OUTSIDE
DIAMETER
O
34.25
870
36.5
927
38.75
985
41.75
1061
43.75
1111
46
1169
48.75
1238
50.75
1289
53
1346
55.25
1404
57.25
1454
59.5
1511
61.75
1569
64
1626
66.25
1683
73
1854
80
2032
86.5
2197
99.75
2534
113.25
2877
FLANGE
THICKNESS
T
1.00
25.4
1.00
25.4
1.00
25.4
1.12
28.6
1.12
28.6
1.12
28.6
1.12
28.6
1.12
28.6
1.25
31.8
1.25
31.8
1.25
3.8
1.38
34.9
1.38
34.9
1.38
34.9
1.38
34.9
1.50
38.1
1.50
38.1
1.50
38.1
1.75
44.5
2.00
50.8
BORE
DIAMETER
C
4
As
specified
by
purchaser
LENGTH
THRU
HUB
G
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
2.25
57.2
2.25
57.2
2.50
63.5
2.50
63.5
2.50
63.5
2.50
63.5
2.75
69.9
2.75
69.9
2.75
69.9
3.00
76.2
3.25
82.6
DIAMETER
OF HUB
AT BASE
M
28.50
723.9
30.50
774.7
32.50
825.5
34.75
882.7
36.75
933.5
38.75
984.3
40.75
1035.1
43.00
1092
45.00
1143
47.00
1194
49.00
1245
51.00
1295
53.00
1346
55.00
1397
57.00
1448
63.00
1600
69.00
1753
75.00
1905
87.50
2223
100.00
2540
Class 125LW Slip-on Flanges in pipe sizes NPS 6 to 96 (DN 150 to 2400) are identical with
AWWA Class D Flanges, as shown on page 40, and have the same diameter and drilling as Class
125 Cast Iron Flanges, ANSI B16.1
These flanges are designed for use with full face gaskets, but ring gaskets extending to the inside
edge of the bolt holes may also be used.
Blind Flanges are available on request.
Can also be furnished in A181 Class 70 and A105 or any other material that can be forged or
rolled.
When specifying bore it is recommended that this dimension be .19" (4.88 mm)
• 34 •
larger than the nominal O.D. of the pipe.
NO.
OF
HOLES
24
24
28
28
28
28
28
28
32
32
32
32
32
32
36
36
36
36
40
40
40
40
44
44
44
44
44
44
44
44
52
52
52
52
60
60
64
64
68
68
DIAMETER
OF
HOLES
J
1.38
35
1.38
35
1.38
35
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
2.12
54
2.38
61
BOLT
DIAMETER
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1/4
1/4
1/4
1/4
1/4
1/4
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
2
2
2 1/4
2 1/4
DIA. OF
BOLT
CIRCLE
K
31.75
806.5
34.00
863.6
36.00
914.4
38.50
977.9
40.50
1028.7
42.75
1085.9
45.25
1149.4
47.25
1200.2
49.50
1257.3
51.75
1314.5
53.75
1365.3
56.00
1422.4
58.25
1479.6
60.50
1536.7
62.75
1593.9
69.25
1759.0
76.00
1930.4
82.50
2095.5
95.50
2425.7
108.50
2755.9
APPROX.
WEIGHT
123
56
141
64
151
68.5
207
94
218
99
233
106
261
118
283
128
332
151
353
160
364
165
425
193
455
206
470
213
510
231
645
293
760
345
845
383
1015
460
1660
753
NOTE: At the time of printing this catalogue the metric
Pressure Number (PN) equivalent of the Class 125
pressure rating of these LW flanges had not been
established, neither had the metric Nominal Diameter (DN)
conversions for various NPS sizes.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
LARGE DIAMETER
FORGED STEEL FLANGES
CLASS 125
AMERICAN STANDARD
WELDING NECK &
2
SLIP-ON FLANGES
1
ASTM A181 CLASS 60
3
BORE
NPS
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
60
66
72
84
96
1
2
3
LENGTH THRU
HUB
DIAMETER
OF HUB
DIA.
OF
FLANGE
WELDING
OUTSIDE FLANGE 5RAISED WELDING
DIA. THICKNESS FACE
NECK SLIP-ON NECK SLIP-ON
T
R
O
B
C
F
G
DN
34.25
2.00
29.25
26.25
5.00
3.38
650
870
50.8
743
666.8
127.0
85.7
36.5
2.06
31.25
28.25
5.06
3.44
700
927
52.4
794
717.6
128.6
87.3
38.75
2.12
33.75
30.25
5.12
3.5
750
985
54.0
857
768.4
130.2
88.9
41.75
2.25
35.75
32.25
5.25
3.62
800
1061
57.2
908
819.2
133.4
92.1
43.75
2.31
37.75
34.25
5.31
3.69
1111
58.7
959
870.0
134.9
93.7
46
2.38
40.25
36.25
5.38
3.75
900
1169
60.3
1022
920.8
136.5
95.3
48.75
2.38
42.25
38.25
5.38
3.75
1238
60.3
1073
971.6
136.5
95.3
50.75
2.50
44.25
40.25
5.50
3.88
1000
1289
63.5
1124
1022.4 139.7
98.4
53
2.62
47
42.25
5.62
4.00
As
1100
1346
66.7
1194
1073.2 142.9
101.6
55.25
2.62
49
44.25
5.62
4.00
specified
1404
66.7
1245
1124.0 142.9
101.6
57.25
2.69
51
46.25
5.69
4.06
by
1454
68.3
1295
1174.8 144.5
103.2
59.5
2.75
53.5 purchaser 48.25
5.75
4.12
1200
1511
69.9
1359
1225.6 146.1
104.8
61.75
2.75
55.5
50.25
5.75
4.12
1569
69.9
1410
1276.4 146.1
104.8
64.0
2.88
57.5
52.25
5.88
4.25
1300
1626
73.0
1461
1327.2 149.2
108.0
66.25
3.00
59.75
54.25
6.00
4.38
1400
1683
76.2
1518
1378.0 152.4
111.1
73.0
3.12
66
60.25
6.12
4.50
1500
1854
79.4
1676
1530.4 155.6
114.3
80.0
3.38
73
66.25
6.38
4.88
2032
85.7
1855
1682.8 161.9
123.8
86.5
3.50
79.5
72.25
6.50
5.00
1800
2197
88.9
2019
1835.2 165.1
127.0
99.75
3.88
92.5
84.25
6.88
5.38
2534
98.4
2350
2140.0 174.6
136.5
113.25
4.25
105.5
96.25
7.25
5.75
2400
2877
108.0
2680
2444.8 184.2
146.1
4
These flanges have the same pressure ratings, dimensions and drillings as Class 125 Cast
Iron Flanges, ASME/ANSI B16.1. Class 125 American Standard slip-on flanges are also the
same as AWWA Class E flanges.
Blind Flanges are available on request.
Can also be furnished in A181 Class 70 and A105 or any other material that can be forged
or rolled.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
• 35 •
4
5
NO.
AT POINT
AT
OF
OF
BASE WELDING HOLES
M
N
28.50
26
24
723.9
660
24
30.75
28
28
781.1
711
28
32.75
30
28
831.9
762
28
35.00
32
28
889.0
813
28
37
34
32
939.8
864
32
39.25
36
32
997.0
914
32
41.75
38
32
1060.5
965
32
43.75
40
36
1111.3 1016
36
46.00
42
36
1168.4 1067
36
48.00
44
40
1219.2 1118
40
50.00
46
40
1270.0 1168
40
52.25
48
44
1327.2 1219
44
54.25
50
44
1378.0 1270
44
56.50
52
44
1435.1 1321
44
58.75
54
44
1492.3 1372
44
65.25
60
52
1657.4 1524
52
71.50
66
52
1816.1 1676
52
78.50
72
60
1993.9 1829
60
90.50
84
64
2298.7 2134
64
102.75
96
68
2609.9 2438
68
DRILLING
DIA.
OF
HOLES
J
1.38
35
1.38
35
1.38
35
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
2.12
54
2.38
61
APPROXIMATE
WEIGHT
DIA. OF
BOLT WELDING
NECK SLIP-ON
CIRCLE
K
31.75
262
233
806.5
118
105
34.00
291
275
863.6
131
124
36.00
341
300
914.4
154
135
38.50
412
370
977.9
186
167
40.50
439
410
1028.7
198
185
42.75
495
460
1085.9
223
207
45.25
573
525
1149.4
258
236
47.25
619
575
1200.2
279
259
49.50
715
660
1257.3
322
297
51.75
755
695
1314.5
340
313
53.75
805
730
1365.3
362
329
56.00
880
810
1422.4
396
365
58.25
915
840
1479.6
412
378
60.50
1020
925
1536.7
459
416
62.75
1110
1040
1593.9
500
468
69.25
1360
1275
1759.0
612
574
76.00
1770
1625
1930.4
797
731
82.50
2125
1950
2095.5
956
878
95.50
2825
2620
2425.7
1271
1179
108.50
3830
3295
2755.9
1724
1483
When ordering Welding Necks, specify thickness and O.D. of pipe or vessel
to which the flange is to be welded.
All sizes are regularly furnished with flat face. A .06" (1.6 mm) raised face
can be furnished on request.
NOTE: At the time of printing this catalogue the metric Pressure Number
(PN) equivalent of the Class 125 pressure rating of these flanges had not
been established, neither had the metric Nominal Diameter (DN) conversions
for various NPS sizes.
LARGE DIAMETER FORGED STEEL FLANGES
CLASS 250
AMERICAN STANDARD
WELDING NECK &
2
SLIP-ON FLANGES
1
ASTM A181-CLASS 60
3
NPS
FLANGE
OUTSIDE
FLANGE
DIAMETER THICKNESS
DN
O
T
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
38.25
972
40.75
10.35
43.0
1092
45.25
1150
47.5
1207
50
1270
52.25
1327
54.5
1384
57
1448
59.25
1505
61.5
1562
65
1651
2.81
71.4
2.94
74.6
3.00
76.2
3.12
79.4
3.25
82.6
3.38
85.7
3.44
87.3
3.56
90.5
3.69
93.7
3.75
95.3
3.88
98.4
4.00
101.6
BORE
B
As
specified
by
purchaser
LENGTH
THRU
HUB
G
DIA.
OF HUB
AT BASE
M
5.81
147.6
5.94
150.9
6.00
152.4
6.12
155.6
6.25
158.8
6.38
161.9
6.44
163.5
6.56
166.7
6.94
176.2
7.00
177.8
7.12
181.0
7.25
184.2
30.50
774.7
33.00
838.2
35.25
895.4
37.50
952.5
39.50
1003.3
41.50
1054.1
43.50
1104.9
45.75
1162.1
47.75
1212.9
49.75
1263.7
51.75
1314.5
54.00
1371.6
DIA. OF
HUB AT
DIA. OF
POINT OF
RAISED
WELDING
FACE
N
A
WELDING NECK
26
32.44
660
823.9
28
34.94
711
887.5
30
37.19
762
944.6
32
39.44
813
1001.8
34
41.44
864
1052.5
36
43.69
914
1109.7
38
45.69
965
1160.5
40
47.94
1016
1217.6
42
50.44
1067
1281.1
44
52.69
1118
1338.3
46
54.94
1169
1395.4
48
58.44
1219
1484.3
NO. OF
HOLES
DRILLING
DIAMETER
DIA. OF
OF
BOLTS
HOLES
J
DIA. OF
BOLT
CIRCLE
K
APPROX.
WEIGHT
28
28
28
28
28
28
28
28
28
28
32
32
32
32
36
36
36
36
36
36
40
40
40
40
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
2.12
54
2.12
54
2.12
54
2.12
54
2.12
54
2.12
54
2.12
54
1
1
1
1
1
1
1
1
1
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
2
2
2
2
2
2
2
2
2
2
2
2
2
2
34.50
876.3
37.00
939.8
39.25
997.0
41.50
1054.1
43.50
1104.9
46.00
1168.4
48.00
1219.2
50.25
1276.4
52.75
1339.9
55.00
1397.0
57.25
1545.2
60.75
1543.1
535
241
640
289
695
313
780
351
885
398
965
434
1040
468
1150
518
1340
603
1420
639
1525
686
1850
833
28
28
28
28
28
28
28
28
28
28
32
32
32
32
36
36
36
36
36
36
40
40
40
40
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
2.12
54
2.12
54
2.12
54
2.12
54
2.12
54
2.12
54
2.12
54
1
1
1
1
1
1
1
1
1
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
2
2
2
2
2
2
3
2
2
2
2
2
2
2
34.50
876.3
37.00
939.8
39.25
997.0
41.50
1054.1
43.50
1104.9
46.00
1168.4
48.00
1219.2
50.25
1276.4
52.75
1339.9
55.00
1397.0
57.25
1454.2
60.75
1543.1
530
239
630
284
700
315
800
360
895
403
975
439
1070
482
1180
531
1310
590
1420
639
1510
680
1825
821
SLIP-ON
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
1
2
3
38.25
972
40.75
1035
43
1093
45.25
1150
47.5
1207
50
1270
52.25
1328
54.5
1385
57
1448
59.25
1505
61.5
1562
65
1651
2.81
71.4
2.94
74.6
3.00
76.2
3.12
79.4
3.25
82.6
3.38
85.7
3.44
87.3
3.56
90.5
3.69
93.7
3.75
95.3
3.88
98.4
4.00
101.6
26.25
666.8
28.25
717.6
30.25
768.4
32.25
819.2
34.25
870.0
36.25
920.8
38.25
971.6
40.25
1022.4
42.25
1073.2
44.25
1124.0
46.25
1174.8
48.25
1225.6
4.75
120.7
5.00
127.0
5.00
127.0
5.12
130.2
5.25
133.4
5.38
136.5
5.50
139.7
5.50
139.7
5.62
142.9
5.75
146.1
5.88
149.2
6.00
152.4
These flanges have the same pressure ratings, dimensions and
drillings as Class 250 Cast Iron Flanges ASME/ANSI B16.1.
Blind Flanges are available upon application.
Can also be furnished in A181 Class 70, and A-105 or any
other material that can be forged or rolled.
30.50
774.7
33.00
838.2
35.25
895.4
37.50
952.5
39.50
1003.3
41.50
1054.1
43.50
1104.9
45.75
1162.1
47.75
1212.9
49.75
1263.7
51.75
1314.5
54.00
1371.6
-
32.44
823.9
34.94
887.5
37.19
944.6
39.44
1001.8
41.44
1052.5
43.69
1109.7
45.69
1160.5
47.94
1217.6
50.44
1281.1
52.69
1338.3
54.94
1395.4
58.44
1484.3
NOTE: At the time of printing this catalogue the metric Pressure Number (PN) equivalent of the Class
125 pressure rating of these LW flanges had not been established, neither had the metric Nominal
Diameter (DN) conversions for
INCHES
POUNDS
various NPS sizes.
• 36 •
MILLIMETRES
KILOGRAMS
LARGE DIAMETER FORGED STEEL FLANGES
CLASS 75
1
PRESSURE VESSEL FLANGES
WELDING NECK & SLIP-ON
2
For Nominal I.D. Vessels
ASTM A181 - CLASS 60
4
NOMINAL
SIZE
(INSIDE
DIAMETER)
26
660
28
711
30
762
32
813
34
864
36
914
42
1067
48
1219
54
1372
60
1524
66
1676
72
1829
26
660
28
711
30
762
32
813
34
864
36
914
42
1067
48
1219
54
1372
60
1524
66
1676
72
1829
FLANGE
OUTSIDE
FLANGE
DIAMETER THICKNESS
O
C
31.5
800
33.5
85
35.5
902
38.25
972
40.25
1023
42.25
1073
49
1245
55
1397
61.25
1556
67.25
1708
74
1880
80
2032
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.38
35.1
1.62
41.3
1.88
47.6
2.25
57.2
33
838
35
889
37
940
39.5
1004
41.5
1054
43.5
1105
50
1270
56
1423
62.5
1588
68.5
1740
75.5
1918
81.5
2070
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.38
34.9
1.62
41.3
1.75
44.5
2
50.8
BORE
B3
As
specified
by
purchaser
As
specified
by
purchaser
1
Alternate designation: 50 lb PRESSURE AT 100˚F (38˚C).
2
Blind Flanges available upon application.
3
LENGTH
THRU
HUB
Y
3.00
76.2
3.00
76.2
3.00
76.2
3.25
82.6
3.25
82.6
3.25
82.6
3.50
88.9
3.75
95.3
4.00
101.6
4.38
111.1
4.88
123.8
5.25
133.4
2.25
57.2
2.25
57.2
2.25
57.2
2.50
63.5
2.50
63.5
2.50
63.5
2.75
69.9
2.88
73.0
3.12
79.4
3.62
92.1
4.00
101.6
4.50
114.3
DIA. OF
HUB AT
DIA. OF
POINT OF
RAISED
WELDING
FACE
A3
R
WELDING NECK
27.12
28.62
688.8
727.1
29.12
30.62
739.8
777.9
31.12
32.62
790.6
828.7
33.38
35.00
847.7
889.0
35.38
37.00
As
898.5
939.8
37.38
39.00
specified
949.3
990.6
43.75
45.50
by
1111.3
1155.7
49.75
51.50
purchaser
1263.7
1308.1
56.00
57.75
1422.4
1466.9
62.00
63.75
1574.8
1619.3
68.0
70.12
1727.2
1781.2
74.00
76.12
1879.6
1933.6
SLIP-0N
28.50
30.00
723.9
762.0
30.50
32.00
774.7
812.8
32.50
34.00
825.5
863.6
34.62
36.25
879.5
920.8
36.62
38.25
930.3
971.6
38.62
40.25
981.1
1022.4
44.75
46.50
1136.6
1181.1
50.75
52.50
1289.1
1333.5
57.25
59.00
1454.2
1498.6
63.25
65.00
1606.6
1651.0
69.50
71.62
1765.3
1819.2
75.50
77.62
1917.7
1971.7
DIA.
OF HUB
AT BASE
X
When ordering these flanges specify thickness and O.D. of the pipe or component with
which they will be used. Pressure ratings are based on I.D. of pipe or vessel as listed in
4
• 37 •
NO. OF
HOLES
DRILLING
DIAMETER
DIA. OF
OF
BOLTS
HOLES
DIA. OF
BOLT
CIRCLE
K
APPROX.
WEIGHT
32
32
36
36
36
36
36
36
40
40
40
40
48
48
52
52
64
64
72
72
72
72
80
80
1
26
1
26
1
26
1.12
29
1.12
29
1.12
29
1.25
32
1.25
32
1.25
32
1.25
32
1.38
35
1.38
35
7/8
7/8
7/8
7/8
7/8
7/8
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
29.62
752.5
31.62
803.3
33.62
854.1
36.12
917.6
38.12
968.4
40.12
1019.2
46.75
1187.5
52.75
1339.9
59.00
1498.6
65.00
1651.0
71.50
1816.1
77.50
1968.5
95
43
105
47
112
51
141
64
153
69
165
74
205
92
245
110
305
137
410
185
575
259
720
324
32
32
36
36
36
36
40
40
40
40
44
44
48
48
56
56
68
68
72
72
72
72
80
80
1
26
1
26
1
26
1.12
29
1.12
29
1.12
29
1.25
32
1.25
32
1.25
32
1.25
32
1.38
35
1.38
35
7/8
7/8
7/8
7/8
7/8
7/8
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
31.00
787.4
33.00
838.2
35.00
889.0
37.38
949.3
39.38
1000.1
41.38
1050.9
47.75
1212.9
53.75
1365.3
60.25
1530.4
66.25
1682.8
73.00
1854.2
79.00
2006.6
115
52
140
63
155
70
165
74
175
79
190
86
225
101
260
117
325
146
440
198
575
259
725
326
“Nominal Size” column, with pipe or vessel thickness in the 0.25" (6.4 mm) to 0.5" (12.7
mm) range.
These flanges can also be supplied in any other material that can be forged or rolled.
LARGE DIAMETER
FORGED STEEL FLANGES
CLASS 1755
WELDING NECK &
SLIP-ON FLANGES1
ASTM A-105 & A181-CLASS 60
4
NOMINAL
SIZE
26
660
28
711
30
762
32
813
34
864
36
914
38
965
40
1016
42
1067
44
1118
46
1168
48
1219
50
1270
52
1321
54
1372
60
1524
66
1676
72
1829
84
2134
96
2438
3
LENGTH THRU
FLANGE
HUB
THICKNESS
FLANGE
OUTSIDE WELDING
WELDING
DIA.
NECK SLIP-ON BORE
NECK SLIP-ON
O
C
C
B2
Y
Y
31.5
1.38
1.38
3.38
2.75
800
34.9
34.9
85.7
69.9
33.5
1.38
1.38
3.38
2.75
851
34.9
34.9
85.7
69.9
35.75
1.38
1.38
3.62
2.75
908
34.9
34.9
92.1
69.9
37.75
1.38
1.38
3.62
2.75
959
34.9
34.9
92.1
69.9
40.25
1.50
1.75
3.75
3.38
1023
38.1
44.5
95.3
85.7
42.25
1.50
1.75
3.75
3.38
1074
38.1
44.5
95.3
85.7
44.25
1.75
2.00
4.12
3.75
1124
44.5
50.8
104.8
95.3
46.25
1.75
2.00
4.12
4.00
1175
44.5
50.8
104.8 101.6
49
2.00
2.38
4.50
4.38
As
1245
50.8
60.3
114.3 111.1
51
2.00
2.38
4.50
4.38
specified
1296
50.8
60.3
114.3 111.1
53
2.00
2.38
4.50
4.62
by
1347
50.8
60.3
114.3 117.5
55
2.25
2.62
4.88
4.88
purchaser
1397
57.2
66.7
123.8 123.8
57
2.25
2.62
4.88
4.88
1448
57.2
66.7
123.8 123.8
59.5
2.62
3.00
5.38
5.38
1512
66.7
76.2
136.5 136.5
61.5
2.62
3.00
5.38
5.38
1562
66.7
76.2
136.5 136.5
67.5
2.75
3.12
5.75
5.88
1715
69.9
79.4
146.1 149.2
73.5
3.12
4.00
6.12
.688
1867
79.4
101.6
155.6 174.6
80
3.62
5.00
6.62
8.00
2032
92.1
127.0
168.3 203.2
94
3.00
5.00
7.00
8.50
2388
76.2
127.0
177.8 215.9
106
3.5
5.00
7.50
9.00
2693
88.9
127.0
190.5 288.6
DIA. OF
HUB AT
BASE
X
27.62
701.7
29.62
752.5
31.88
809.6
33.88
860.4
35.88
911.2
37.88
962.2
39.88
1012.8
41.88
1063.6
44.12
1120.8
46.12
1171.6
48.12
1222.4
50.12
1273.2
52.12
1324.0
54.25
1378.0
56.25
1428.8
62.25
1581.2
68.50
1739.9
74.50
1892.3
88.00
2235.2
100.0
2540.0
1
Blind Flanges are available upon application.
2
When ordering, specify thickness and O.D. of pipe vessel to which flange is
to be welded.
3
Sizes are INSIDE diameters of pipe or shell used with Welding Neck
Flanges, and NOMINAL outside diameters of pipe or shell used with Slip-on
Flanges.
DIA. OF
HUB AT DIA. OF
POINT OF RAISED
WELDING FACE
A2
R
29.00
736.6
31.00
787.4
33.25
844.6
32.25
895.4
37.38
949.3
39.38
1000.1
41.38
1050.9
43.38
1101.7
45.75
As
1162.1
47.75
specified
1212.9
49.75
by
1263.7
51.75
purchaser
1314.5
53.75
1365.3
56.00
1422.4
58.00
1473.2
64.00
1625.6
70.00
1778.0
76.50
1943.1
90.12
2289.2
102.12
2594.0
• 38 •
NO. OF
HOLES
28
28
28
28
36
36
36
36
36
36
36
36
36
36
40
40
40
40
40
40
40
40
44
44
44
44
44
44
44
44
48
48
56
56
64
64
72
72
88
88
DRILLING
DIA.
BOLT
OF
DIA.
HOLES
.88
23
.88
23
.88
23
.88
23
1
26
1
26
1
26
1
26
1.12
29
1.12
29
1.12
29
1.12
29
1.12
29
1.25
32
1.25
32
1.25
32
1.25
32
1.25
32
1.38
35
1.38
35
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
1
1
1
1
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
APPROX.
WEIGHT
DIA. OF
BOLT WELDING
NECK SLIP-ON
CIRCLE
K
29.88
125
110
758.8
56
50
31.88
130
120
809.6
59
54
34.12
145
135
866.8
65
61
36.12
165
145
917.6
74
65
38.38
190
205
974.7
86
92
40.38
210
215
1025.5
95
97
42.38
235
255
1076.3
106
115
44.38
250
275
1127.1
113
124
46.88
345
370
1190.6
155
167
48.88
365
385
1241.4
164
173
50.88
380
410
1292.2
71
185
52.88
425
455
1343.0
191
205
54.88
455
475
1393.8
205
214
57.25
550
605
1454.2
248
272
59.25
590
625
1505.0
266
281
65.25
675
725
1657.4
304
326
71.25
825
1020
1809.8
371
459
77.75
1060
1400
1974.9
477
630
91.50
1550
2225
2324.1
698
1001
103.50
1975
2575
2628.9
889
1159
4
These flanges can also be furnished in any other material that can be forged
or rolled.
5
Alternate designation, 150 lb. WSP. at 750˚F (399˚C).
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
LARGE DIAMETER
FORGED STEEL FLANGES
CLASS 300
WELDING NECK &
SLIP-ON FLANGES1
5
ASTM A-105 & A181- CLASS 60
4
NOMINAL
SIZE
26
660
28
711
30
762
32
813
34
864
36
914
38
965
40
1016
42
1067
44
1118
46
1168
48
1219
52
1321
54
1372
60
1524
66
1676
72
1829
84
2134
96
2438
3
1
2
3
LENGTH THRU
FLANGE
HUB
THICKNESS
FLANGE
OUTSIDE WELDING
WELDING
DIA.
NECK SLIP-ON BORE
NECK SLIP-ON
O
C
C
B2
Y
Y
32.75
2.50
2.50
5.00
4.50
832
63.5
63.5
127.0 114.3
34.75
2.50
2.50
5.00
4.50
883
63.5
63.5
127.0 114.3
37
2.62
2.62
5.25
4.75
940
66.7
66.7
133.4 120.7
39
2.75
2.75
5.50
5.00
991
69.9
69.9
139.7 127.0
41
2.88
2.88
5.75
5.12
1042
73.0
73.0
146.1 130.2
43.75
3.12
3.12
6.13
5.62
1112
79.4
79.4
155.6 142.9
45.75
3.12
3.12
6.13
5.62
1162
79.4
79.4
155.6 142.9
47.75
3.25
3.25
6.25
5.88
1213
82.6
82.6
158.8 149.2
As
50
3.50
3.50
6.50
6.12
1270
88.9
88.9
165.1 155.6
specified
52.75
3.75
3.75
6.75
6.75
1340
95.3
95.3
171.5 171.5
by
54.75
4.25
4.25
7.25
7.25
1391
108.0 108.0
184.2 184.2
purchaser
56.75
4.25
4.25
7.25
7.25
1442
108.0 108.0
184.2 184.2
61.5
4.25
7.50
1562
108.0
190.5
63.5
4.50
4.75
7.75
8.25
1613
114.3 120.7
196.9 209.6
69.5
4.50
5.00
8.00
8.50
1766
114.3 127.0
203.2 215.9
77
4.00
.50
1956
101.6
215.9
83
4.00
9.00
2109
101.6
228.6
96.5
5.00
10.00
2451
127.0
254.0
109.25
6.25
11.25
2775 158.85
285.8
-
DIA. OF
HUB AT
BASE
X
27.88
708.0
29.88
758.8
32.12
816.0
34.12
866.8
36.12
917.6
38.5
977.9
40.5
1028.7
42.5
1079.5
44.75
1136.7
46.75
1187.5
48.75
1238.3
50.75
1289.1
55
1397.0
57
1447.8
63
1600.2
70
1778.0
76
1930.4
89
2260.6
101.25
2571.8
DIA. OF
HUB AT DIA. OF
POINT OF RAISED
WELDING FACE
A2
R
29.50
749.3
31.50
800.1
33.75
857.3
35.75
908.1
37.75
958.9
40.25
1022.4
42.25
1073.2
44.25
1224.0
As
46.50
1181.1
specified
48.88
1241.4
by
50.88
1292.2
purchaser
52.88
1343.0
57.25
1454.2
59.25
1505.0
65.25
1657.4
72.38
1838.3
78.38
1990.7
91.50
2324.1
103.88
2638.4
NO. OF
HOLES
28
28
28
28
32
32
36
36
40
40
40
40
40
40
44
44
48
48
44
44
48
48
48
48
52
52
52
52
60
60
60
60
72
72
80
80
84
84
DRILLING
DIA.
BOLT
OF
DIA.
HOLES
1.12
29
1.12
29
1.12
29
1.12
29
1.12
29
1.25
32
1.25
32
1.25
32
1.25
32
1.38
35
1.38
35
1.38
35
1.5
35
1.5
35
1.5
35
1.62
42
1.62
42
1.75
45
1.88
48
1
1
1
1
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/2
1 1/2
1 1/2
1 1/2
1 5/8
1 5/8
1 3/4
1 3/4
APPROX.
WEIGHT
DIA. OF
BOLT WELDING
NECK SLIP-ON
CIRCLE
K
30.62
250
230
777.9
113
104
32.62
265
255
828.7
119
115
34.88
310
290
885.8
140
131
36.88
340
325
936.6
153
146
38.88
385
350
987.4
173
158
41.50
475
460
1054.1
214
207
43.50
520
485
1104.9
234
218
45.50
550
525
1155.7
248
236
47.75
650
625
1212.9
293
281
50.25
770
760
1276.4
347
342
52.25
895
880
1327.2
403
396
54.25
925
925
1378.0
416
416
58.75
1075
1492.3
484
60.75
1225
1160
1543.1
551
522
66.75
1325
1470
1695.5
596
662
74.00
1680
1879.6
756
80.00
1875
2032.0
844
93.25
2950
2368.6
1328
105.75
4300
2686.1
1935
-
Blind Flanges are available upon application.
When ordering, specify thickness and O.D. of pipe vessel to which flange is
to be welded.
Sizes are INSIDE diameters of pipe or shell used with Welding Neck
Flanges, and nominal OUTSIDE diameters of pipe or shell used with Slip-on
Flanges.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
• 39 •
4
These flanges can also be furnished in any other material that can be forged
or rolled.
5
Alternate designation, 300 lb. WSP. at 750˚F (399˚C).
LARGE DIAMETER FORGED STEEL FLANGES
AWWA C207-55 HUB FLANGES2
ASTM A181-CLASS 60
NPS3
DN
6
150
8
200
10
250
12
300
14
350
16
400
18
450
20
500
22
550
24
600
26
650
28
700
30
750
32
800
36
900
40
1000
42
1100
48
1200
60
1500
72
1800
96
2400
FLANGE
OUTSIDE
DIA.
O
11
280
13.5
343
16
407
19
483
21
534
23.5
597
25
635
27.5
699
29.5
750
32
813
34.25
870
36.5
927
38.75
985
41.75
1061
46
1169
50.75
1289
53
1347
59.5
1512
73
1855
86.5
2197
113.25
2877
LENGTH THRU
HUB Y
FLANGE
THICKNESS C
CLASS
B&D
.56
14.3
.56
14.3
.69
17.5
.69
17.5
.75
19.1
.75
19.1
.75
19.1
.75
19.1
1
25.4
1
25.4
1
25.4
1
25.4
1
25.4
1.12
28.6
1.12
28.6
1.12
28.6
1.25
31.8
1.38
34.9
1.5
38.1
1.5
38.1
2.0
50.8
CLASS
E
1.00
25.4
1.25
31.8
1.19
30.2
1.25
31.8
1.38
34.9
1.44
36.5
1.56
39.7
1.69
42.9
1.81
46.0
1.88
47.6
2.00
50.8
2.06
52.4
2.12
54.0
2.25
57.2
2.38
60.3
2.50
63.5
2.62
66.7
2.75
69.9
3.12
79.4
3.50
88.9
4.25
108.0
BORE
DIA.
P
As
specified
by
purchaser
CLASS
B&D
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.25
31.8
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
1.75
44.5
2.50
63.5
2.75
69.9
2.75
69.9
3.25
82.6
CLASS
E
1.56
39.7
1.75
44.5
1.94
49.2
2.19
55.6
2.25
57.2
2.50
63.5
2.69
68.3
2.88
73.0
3.12
79.4
3.25
82.6
3.38
85.7
3.44
87.3
3.50
88.9
3.62
92.1
3.75
95.3
3.88
98.4
4.00
101.6
4.12
104.8
4.50
114.3
5.00
127.0
5.75
146.1
DIA. OF HUB
AT BASE X
CLASS
B&D
7.56
192.1
9.69
246.1
12.00
304.8
14.38
365.1
15.75
400.1
18.00
457.2
19.88
504.8
22.00
558.8
24.25
616.0
26.12
663.6
28.50
723.9
30.50
774.7
32.50
825.5
34.75
882.7
38.75
984.3
43.00
1092.2
45.00
1143.0
51.00
1295.4
63.00
1600.2
75.00
1905.0
100.0
2540.0
CLASS B FLANGES have a water service rating at atmospheric temperature
of 86 psi. These flanges have the same outside diameter, bolt circle and
number of bolts as ASME/ANSI B16.1 (25 psi cast-iron pipe flanges and
flanged fittings).
In sizes NPS 48 (DN 1200) and under they have the same bolts, and in sizes
over NPS 48 (DN 1200) they use larger bolts than specified by this 25 psi
standard.
They also have the same outside diameter, bolt circle, and number of bolts as
ASME/ANSI B16.1 (125 psi cast-iron pipe flanges and flanged fittings), but
use smaller bolts.
CLASS D FLANGES have a water service rating at atmospheric temperature;
1
2
CLASS
E
7.56
192.0
9.69
246.0
12.00
304.8
14.38
365.1
15.75
400.0
18.00
457.2
19.88
504.8
22.00
558.8
24.25
616.0
26.12
663.6
28.50
723.9
30.75
781.1
32.75
831.9
35.00
889.0
39.25
997.0
43.75
1111.3
46.00
1168.4
52.25
1327.3
65.25
1657.4
78.50
1993.9
102.75
2609.9
NO. OF
HOLES
8
8
8
8
12
12
12
12
12
12
16
16
16
16
20
20
20
20
20
20
24
24
28
28
28
28
28
28
32
32
36
36
36
36
44
44
52
52
60
60
68
68
DIA. OF
BOLT
CIRCLE
K
9.50
241.3
11.75
298.5
14.25
362.0
17.00
431.8
18.75
476.3
21.25
559.8
22.75
577.9
25.00
635.0
27.25
692.2
29.50
749.3
31.75
806.5
34.00
863.6
36.00
914.4
38.50
977.9
42.75
1085.9
47.25
1200.2
49.50
1257.3
56.00
1422.4
69.25
1759.0
82.50
2095.5
108.5
2755.9
DIA. OF
HOLES
CLASS
B
.75
20
.75
20
.75
20
.75
20
.88
23
.88
23
.88
23
.88
23
.88
23
.88
23
.88
23
.88
23
1
26
1
26
1
26
1
26
1.12
29
1.12
29
1.38
35
1.38
35
1.88
48
CLASS
D&E
.88
23
.88
23
1
26
1
26
1.12
29
1.12
29
1.25
32
1.25
32
1.38
35
1.38
35
1.38
35
1.38
35
1.62
42
1.62
42
1.62
42
1.62
42
1.62
42
1.62
42
1.88
48
1.88
48
2.38
61
APPROX.
WEIGHT
CLASS
B&D
14
6.3
18
8
27
12
41
18.5
45
20
57
25.5
59
26.5
68
31
75
34
117
53
126
57
139
63
152
68
208
94
235
106
281
127
327
147
420
189
645
291
855
385
1730
779
CLASS
E
19
9
32
14.5
42
19
65
29
86
39
92
42
118
53
153
69
177
80
212
96
235
106
273
123
310
140
370
167
460
207
527
259
660
297
800
360
1275
574
1950
878
3250
1463
sizes NPS 6 to NPS 12 (DN 150 to DN 300) inclusive, 175 psi; sizes larger
than NPS 12 (DN 300) 150 psi. These flanges have the same diameter and
drilling as Class 125 cast-iron flanges. (ASME/ANSI B16.1).
CLASS E FLANGES have a water service rating at atmospheric temperature
of 275 psi. These flanges have the same diameter and drilling as Class 125
cast-iron flanges (ASME/ANSI B16.1). In sizes NPS 24 (DN 600) and smaller
they also match ASME/ANSI B16.5 150 psi standard for steel flanges.
All Flanges: Carbon steel bolts should be used. Cloth-inserted rubber gaskets
.06" (1.6 mm) thick should be used and should extend from the I.D. of flange
to at least the inside edge of the bolt holes.
Can also be furnished in A181 CLASS 70 and A-105, or any other material
that can be forged or rolled.
3
Ring and Blind flanges to match AWWA Hub flanges are available upon
application.
• 40 •
For sizes other than those shown full information is available upon request.
LARGE DIAMETER
FORGED STEEL FLANGES
PIPE LINE FLANGES
CLASS 150 (PN 20)
WELDING NECK & BLIND
ASTM A-105
2
NPS
DN
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
50
52
1300
54
1400
56
58
60
1500
FLANGE
FLANGE
OUTSIDE THICKNESS
DIA.
(MIN.)2
O
C
34.25
2.69
870
68.5
36.50
2.81
925
71.5
38.75
2.94
985
74.5
41.75
3.18
1060
81.0
43.75
3.25
1110
82.5
46.00
3.56
1170
90.5
48.75
3.44
1240
87.4
50.75
3.56
1290
90.5
53.00
3.81
1345
97.0
55.25
4.00
1405
102.0
57.25
4.06
1455
103.0
59.50
4.25
1510
108.0
61.75
4.38
1570
111.0
64.00
4.56
1625
116.0
66.25
4.75
1685
121.0
68.75
4.88
1745
124.0
71.00
5.06
1805
129.0
73.00
5.19
1855
132.0
LENGTH
THRU
HUB
Y1
4.75
121
4.94
125
5.38
137
5.69
144
5.88
149
6.18
157
6.19
157
6.44
164
6.75
171
7.00
178
7.31
186
7.56
192
8.00
203
8.25
210
8.50
216
9.00
229
9.25
235
9.44
240
HUB
DIA.
AT BASE
X
26.62
675
28.62
725
30.75
780
32.75
830
34.75
380
36.75
935
39.00
990
41.00
1040
43.00
1090
45.00
1145
47.12
1195
49.12
1250
51.25
1300
53.25
1355
55.25
1405
57.38
1455
59.38
1510
61.38
1560
HUB DIA.
AT POINT
OF
WELDING
A
26.00
660
28.00
711
30.00
762
32.00
813
34.00
863
36.00
914
38.00
965
40.00
1016
42.00
1067
44.00
1118
46.00
1168
48.00
1219
50.00
1270
52.00
1321
54.00
1372
56.00
1422
58.00
1473
60.00
1524
1
Includes .06" (1.5mm) raised face.
2
Materials covered in this Standard are as in ASME/ANSI B16.5 except nickel
based alloys are excluded.
3
Bore diameter as specified by Purchaser.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
RAISED
FACE
DIA.
R
29.50
749
31.50
800
33.75
857
36.00
914
38.00
965
40.25
1022
42.25
1073
44.25
1124
47.00
1194
49.00
1245
51.00
1295
53.50
1359
55.50
1410
57.50
1460
59.50
1511
62.00
1575
64.00
1626
66.00
1676
• 41 •
NO. OF
BOLT
HOLES
DRILLING
DIA.
OF BOLT
HOLES
DIA.
OF BOLT
CIRCLE
24
24
28
28
28
28
28
28
32
32
32
32
32
32
36
36
36
36
40
40
40
40
44
44
44
44
44
44
44
44
48
48
48
48
52
52
1.38
35
1.38
35
1.38
35
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.62
41
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
1.88
48
31.75
806
34.00
863
36.00
914
38.50
978
40.50
1029
42.75
1086
45.25
1150
47.25
1200
49.50
1257
51.75
1314
53.75
1365
56.00
1422
58.25
1480
60.50
1537
62.75
1594
65.00
1651
67.25
1708
69.25
1759
FILLET
RADIUS
(MIN.)
r
.38
10
.44
11
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
APPROX.
WEIGHT
WELDING
BLIND
NECK
300
136
315
143
360
163
435
197
465
211
520
236
778
353
831
377
966
438
1058
480
1131
513
1248
566
1351
613
1508
684
1667
756
1817
824
2006
910
2108
956
677
307
833
378
963
437
1200
544
1342
609
1540
698
1780
807
1992
903
2332
1058
2656
1205
2903
1317
3276
1486
3605
1635
4043
1834
4521
2051
4981
2259
5540
2513
6000
2722
LARGE DIAMETER
FORGED STEEL FLANGES
WELDING NECK & BLIND
CLASS 300 (PN 50)
3
ASME B16.47 SERIES A
2
ASTM A-105
FLANGE THICKNESS3
NPS
DN
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
50
52
1300
54
1400
56
58
60
1500
FLANGE
OUTSIDE WELDING
DIA.
NECK
O
C
38.25
3.12
970
79.5
40.75
3.38
1035
85.5
43.00
3.62
1090
92.0
45.25
3.88
1150
98.5
47.50
4.00
1205
102
50.00
4.12
1270
105
46.00
4.25
1170
108
48.75
4.50
1240
114
50.75
4.69
1290
119
53.25
4.88
1355
124
55.75
5.06
1415
129
57.75
5.25
1465
133
60.25
5.50
1530
140
62.25
5.69
1580
144
65.25
6.00
1660
152
67.25
6.06
1710
154
69.25
6.25
1760
159
71.25
6.44
1810
164
BLIND
E
3.31
84.0
3.56
90.5
3.75
95.0
3.94
100
4.12
105
4.38
111
4.25
108
4.50
114
4.69
119
4.88
124
5.06
129
5.25
133
5.50
140
5.69
144
6.00
152
6.06
154
6.25
159
6.44
164
LENGTH
THRU
HUB
Y1
7.25
184
7.75
197
8.25
210
8.75
222
9.12
232
9.50
241
7.12
181
7.62
194
7.88
200
8.12
206
8.50
216
8.81
224
9.12
232
9.38
238
9.94
252
10.25
260
10.50
267
10.75
273
HUB
DIA.
AT BASE
X
28.38
720
30.50
775
32.56
825
34.69
880
36.88
935
39.00
990
39.12
995
41.25
1050
43.25
1100
45.25
1150
47.38
1205
49.38
1255
51.38
1305
53.38
1355
55.50
1410
57.62
1465
59.62
1515
61.62
1565
1
Includes .06" (1.5 mm) raised face.
2
Materials covered in this Standard are as in ASME/ANSI B16.47 except
nickel based alloys are excluded.
3
Bore diameter as specified by Purchaser.
HUB DIA.
AT POINT
OF
WELDING
A
26.00
660
28.00
711
30.00
762
32.00
813
34.00
863
36.00
914
38.00
965
40.00
1016
42.00
1067
44.00
1118
46.00
1168
48.00
1219
50.00
1270
52.00
1321
54.00
1372
56.00
1422
58.00
1473
60.00
1524
• 42 •
RAISED
FACE
DIA.
R
29.50
749
31.50
800
33.75
857
36.00
914
38.00
965
40.25
1022
40.50
1029
42.75
1086
44.75
1137
47.00
1194
49.00
1245
51.25
1314
53.50
1359
55.50
1410
57.75
1467
59.75
118
62.00
1575
64.00
1626
NO. OF
BOLT
HOLES
DRILLING
DIA.
OF BOLT
HOLES
DIA.
OF BOLT
CIRCLE
28
28
28
28
28
28
28
28
28
28
32
32
32
32
32
32
32
32
32
32
28
28
32
32
32
32
32
32
28
28
28
28
32
32
32
32
1.75
44
1.75
44
1.88
48
2.00
51
2.00
51
2.12
54
1.62
41
1.75
44
1.75
44
1.88
48
2.00
51
2.00
51
2.12
54
2.12
54
2.38
60
2.38
60
2.38
60
2.38
60
34.50
876
37.00
940
39.25
997
41.50
1054
43.50
1105
46.00
1168
43.00
1092
45.50
1156
47.50
1206
49.75
1264
52.00
1321
54.00
1372
56.25
1429
58.25
1480
61.00
1549
63.00
1600
65.00
1651
67.00
1702
FILLET
RADIUS
(MIN.)
r
.38
10
.44
11
.44
11
.44
11
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
.50
13
APPROX.
WEIGHT
WELDING
BLIND
NECK
615
279
750
340
858
390
960
435
1110
504
1223
560
1116
506
1362
618
1590
721
1862
845
2134
968
2586
1173
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
LARGE DIAMETER
FORGED STEEL FLANGES
PIPE LINE FLANGES
CLASS 400 (PN 68)
WELDING NECK & BLIND
3
ASME B16.47 SERIES A
2
ASTM A-105
FLANGE THICKNESS1
NPS
DN
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
50
52
1300
54
1400
56
58
60
1500
FLANGE
OUTSIDE WELDING
DIA.
NECK
O
C
38.25
3.50
970
89.0
40.75
3.75
1035
95.0
43.00
4.00
1090
102
45.25
4.25
1150
108
47.50
4.38
1205
111
50.00
4.50
1270
114
47.50
4.88
1205
124
50.00
5.12
1270
130
52.00
5.25
1320
133
54.50
5.50
1385
140
56.75
5.75
1440
146
59.50
6.00
1510
152
61.75
6.19
1570
157
63.75
6.38
1620
162
67.00
6.69
1700
170
69.00
6.88
1755
175
71.00
7.00
1805
178
74.25
7.31
1885
186
BLIND
E
3.88
98.5
4.12
105
4.38
111
4.56
116
4.81
122
5.06
129
4.88
124
5.12
130
5.25
133
5.50
140
5.75
146
6.00
152
6.25
159
6.44
164
6.75
171
6.94
176
7.12
181
7.44
189
LENGTH
THRU
HUB
Y1
7.62
194
8.12
206
8.62
219
9.12
232
9.50
241
9.88
251
8.12
206
8.50
216
8.81
224
9.18
233
9.62
244
10.12
257
10.56
268
10.88
276
11.38
289
11.75
298
12.06
306
12.56
319
HUB
DIA.
AT BASE
X
28.62
725
30.81
785
32.94
835
35.00
890
37.19
945
39.38
1000
39.50
1005
41.50
1055
43.62
1110
45.62
1160
47.75
1215
49.88
1265
52.00
1320
54.00
1370
56.12
1425
58.25
1480
60.25
1530
62.38
1585
HUB DIA.
AT POINT
OF
WELDING
A
26.00
660
28.00
711
30.00
762
32.00
813
34.00
863
36.00
914
38.00
965
40.00
1016
42.00
1067
44.00
1118
46.00
1168
48.00
1219
50.00
1270
52.00
1321
54.00
1372
56.00
1422
58.00
1473
60.00
1524
RAISED
FACE
DIA.
R
29.50
749
31.50
800
33.75
857
36.00
914
38.00
965
40.25
1022
40.5
1035
43.00
1092
45.00
1143
47.25
1200
49.50
1257
51.50
1308
53.62
1362
55.62
1413
57.88
1470
60.12
1527
62.12
1527
64.38
1527
NO. OF
BOLT
HOLES
DRILLING
DIA.
OF BOLT
HOLES
DIA.
OF BOLT
CIRCLE
28
28
28
28
28
28
28
28
28
28
32
32
32
32
32
32
32
32
32
32
36
36
28
28
32
32
32
32
28
28
32
32
32
32
32
32
1.88
48
2.00
51
2.12
54
2.12
54
2.12
54
2.12
54
1.88
48
2.00
51
2.00
51
2.12
54
2.12
54
2.38
60
2.38
60
2.38
60
2.62
67
2.62
67
2.62
68
2.88
73
34.50
876
37.00
940
39.25
997
41.50
1054
43.50
1105
46.00
1168
44.00
1118
46.25
1175
48.25
1226
50.50
1283
52.75
1340
55.25
1403
57.50
1460
59.50
1511
62.25
1581
64.25
1632
66.25
1683
69.00
1753
1
Does not include .25" (6.5mm) raised face.
2
Material covered in this Standard are as in ASME/ANSI B16.5 except nickel based alloys are excluded.
3
Bore diameter as specified by Purchaser.
4
These flanges can also be supplied in any material that can be forged or rolled.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
• 43 •
FILLET
RADIUS
(MIN.)
r
.44
11
.50
13
.50
13
.50
13
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
APPROX.
WEIGHT
WELDING
BLIND
NECK
769
349
902
409
1025
465
1188
539
1340
608
1520
689
1226
556
1483
673
1760
798
2036
924
2374
1077
2756
1250
LARGE DIAMETER
FORGED STEEL FLANGES
PIPE LINE FLANGES
CLASS 600 (PN 100)
3
WELDING NECK & BLIND
ANSI/ASME B16.47 SERIES A
2
ASTM A-105
FLANGE THICKNESS3
NPS
DN
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
50
52
1300
54
1400
56
58
60
1500
FLANGE
OUTSIDE WELDING
DIA.
NECK
O
C
40.00
4.25
1015
108
42.25
4.38
1075
111
44.50
4.50
1130
114
47.00
4.62
1195
117
49.00
4.75
1245
121
51.75
4.88
1315
124
50.00
6.00
1270
152
52.00
6.25
1320
159
55.25
6.62
1405
168
57.25
6.81
1455
173
59.50
7.06
1510
179
62.75
7.44
1595
189
65.75
7.75
1670
198
67.75
8.00
1720
203
70.00
8.25
1780
210
73.00
8.56
1855
217
75.00
8.75
1905
222
78.50
9.19
1995
233
BLIND
E
4.94
125
5.19
132
5.50
140
5.81
148
6.06
154
6.38
162
6.12
156
6.38
162
6.75
171
7.00
178
7.31
186
7.69
195
8.00
203
8.25
210
8.56
217
8.88
225
9.12
232
9.56
243
LENGTH
THRU
HUB
Y1
8.75
222
9.25
235
9.75
248
10.25
260
10.62
270
11.12
283
10.00
254
10.38
264
11.00
279
11.38
289
11.81
300
12.44
316
12.94
329
13.25
337
13.75
349
14.25
362
14.56
370
15.31
389
HUB
DIA.
AT BASE
X
29.44
748
31.62
803
33.94
862
36.12
917
38.31
973
40.62
1032
40.25
1022
42.25
1073
44.28
1125
46.50
1181
48.62
1235
50.75
1289
52.88
1343
54.88
1394
57.00
1448
59.12
1502
61.12
1552
63.38
1610
HUB DIA.
AT POINT
OF
WELDING
A
26.00
660
28.00
711
30.00
762
32.00
813
34.00
863
36.00
914
38.00
965
40.00
1016
42.00
1067
44.00
1118
46.00
1168
48.00
1219
50.00
1270
52.00
1321
54.00
1372
56.00
1422
58.00
1473
60.00
1524
1
Includes .25" (6.5 mm) raised face.
2
Materials covered in this Standard are as in ASME/ANSI B16.5 except nickel
based alloys are excluded.
3
Bore diameter as specified by Purchaser.
RAISED
FACE
DIA.
R
29.50
749
31.50
800
33.75
857
36.00
914
38.00
965
40.25
1022
41.50
1054
43.75
1111
46.00
1168
48.25
1226
50.25
1276
52.50
1283
54.50
1384
56.50
1435
58.75
1492
60.75
1543
63.00
1600
65.25
1657
• 44 •
NO. OF
BOLT
HOLES
DRILLING
DIA.
OF BOLT
HOLES
DIA.
OF BOLT
CIRCLE
28
28
28
28
28
28
28
28
28
28
28
28
28
28
32
32
28
28
32
32
32
32
32
32
28
28
32
32
32
32
32
32
32
32
28
28
2.00
51
2.12
54
2.12
54
2.38
60
2.38
60
2.38
60
2.38
60
2.38
60
2.62
67
2.62
67
2.62
67
2.88
73
3.12
79
3.12
79
3.12
79
3.38
86
3.38
86
3.62
92
36.00
914
38.00
965
40.25
1022
42.50
1080
44.50
1130
47.00
1194
45.75
1162
47.75
1213
50.50
1283
52.50
1327
54.75
1391
57.50
1467
60.00
1524
62.00
1575
64.25
1632
66.75
1695
68.75
1746
71.75
1822
FILLET
RADIUS
(MIN.)
r
.50
13
.50
13
.50
13
.50
13
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.56
14
.62
16
.62
16
.69
17
APPROX.
WEIGHT
WELDING
BLIND
NECK
963
437
1120
508
1232
559
1500
680
1580
717
1750
794
1734
786
1029
916
2398
1088
2815
1277
3206
1454
3744
1698
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
LARGE DIAMETER
FORGED STEEL FLANGES
PIPE LINE FLANGES
2
CLASS 900 (PN 150)
3
WELDING NECK & BLIND
ANSI/ASME B16.47 SERIES A
4
ASTM A-105
FLANGE THICKNESS3
NPS
DN
26
650
28
700
30
750
32
800
34
36
900
38
40
1000
42
1100
44
46
48
1200
FLANGE
OUTSIDE WELDING
DIA.
NECK
O
C
42.75
5.50
1085
140
46.00
5.62
1170
143
48.50
5.88
1230
149
51.75
6.25
1315
159
55.00
6.50
1395
165
57.50
6.75
1460
171
57.50
750
1460
190
59.50
7.75
1510
197
61.50
8.12
1560
206
64.88
8.44
1650
214
68.25
8.88
1735
225
70.25
9.19
1785
233
BLIND
E
6.31
160
6.75
171
7.18
183
7.62
194
8.06
205
8.44
214
8.50
216
8.81
224
9.12
232
9.56
243
10.06
256
10.38
264
LENGTH
THRU
HUB
Y1
11.25
286
11.75
298
12.25
311
13.00
330
13.75
349
14.25
362
13.88
352
14.31
364
14.62
37
15.38
391
16.18
411
16.50
419
HUB
DIA.
AT BASE
X
30.50
775
32.75
832
35.00
889
37.25
946
39.62
1006
41.88
1064
42.75
1073
44.38
1127
46.31
1176
48.62
1235
50.88
1292
52.88
1343
1
Does not include .25" (6.5 mm) raised face.
2
Materials covered in this Standard are as in ASME/ANSI B16.5, except
nickel based alloys are excluded.
3
Bore diameter as specified by Purchaser.
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
HUB DIA.
AT POINT
OF
WELDING
A
26.00
660
28.00
711
30.00
762
32.00
813
34.00
864
36.00
914
38.00
965
40.00
1016
42.00
1067
44.00
1118
46.00
1168
48.00
1219
RAISED
FACE
DIA.
R
29.50
749
31.50
800
33.75
857
36.00
914
38.00
965
40.25
1022
43.25
1099
45.75
1162
47.75
1213
50.00
1270
52.50
1334
54.50
1384
• 45 •
NO. OF
BOLT
HOLES
DRILLING
DIA.
OF BOLT
HOLES
DIA.
OF BOLT
CIRCLE
20
20
20
20
20
20
20
20
20
20
20
20
20
20
24
24
24
24
24
24
24
24
24
24
2.88
73
3.12
79
3.12
79
3.38
86
3.62
92
3.62
92
3.62
92
3.62
92
3.62
92
3.88
98
4.12
105
4.12
105
37.50
952
40.25
1022
42.75
1086
45.50
1156
48.25
1226
50.75
1289
50.75
1289
52.75
1340
54.75
1391
57.62
1464
60.50
1537
62.50
1588
FILLET
RADIUS
(MIN.)
r
.44
11
.50
13
.50
13
.50
13
.56
14
.56
14
.75
19
.81
21
.81
21
.88
22
.88
22
.94
24
APPROX.
WEIGHT
WELDING
BLIND
NECK
1614
732
1894
859
2196
996
2628
1192
3100
1407
3535
1603
2423
1099
3012
1366
3564
1617
4286
1944
5207
2362
6003
2723
LARGE DIAMETER
STEEL FLANGES
CLASS 150 (PN 20) AND
CLASS 300 (PN 50)
WELDING NECK
ASTM A-1052
3
FLANGE
FLANGE
DIAMETER THICKNESS
DN
O
C
NPS
26
650
28
700
30
750
32
800
34
850
4
36
900
42
1100
48
1200
54
1400
60
1500
30.94
786
32.94
837
34.94
887
37.06
941
39.56
1005
41.62
1057
48.25
1226
54.81
1392
61.00
1549
67.94
1726
1.62
41.3
1.75
44.4
1.75
44.4
1.81
46.0
1.94
49.2
2.06
52.4
2.31
58.7
2.56
65.1
2.81
71.4
3.00
76.2
RAISED
FACE
DIA.
R
28.00
711.2
30.00
762.0
32.00
812.8
34.00
863.6
36.25
920.8
38.25
971.6
44.50
1130.3
50.75
1289.0
56.75
1441.4
63.00
1600.2
BORE
B
As
specified
by
Customer
HUB DIA.
AT POINT
OF
WELDING
A
26.06
662.0
28.06
712.8
30.06
763.6
32.06
814.4
34.06
865.2
36.06
916.0
42.12
1070.0
48.12
1222.4
54.12
1374.8
60.12
1527.2
DRILLING
LENGTH
THRU
HUB
Y
NO.
OF
HOLES
FILLET
RADIUS
r
DIA. OF
HOLES
DIA. OF
BOLT
CIRCLE
K
APPROX.
WEIGHT
3.50
88.9
3.75
95.2
3.94
100.0
4.25
108.0
4.34
110.3
4.62
117.5
5.25
133.4
5.88
149.2
6.38
161.9
7.06
179.4
.38
9.5
.38
9.5
.38
9.5
.38
9.5
.38
9.5
.38
9.5
.44
11.1
.44
11.1
.44
11.1
.56
14.3
36
36
40
40
44
44
48
48
40
40
44
44
48
48
44
44
56
56
52
52
.88
22.2
.88
22.2
.88
22.2
.88
22.2
1.00
25.4
1.00
25.4
1.12
28.6
1.25
31.8
1.25
31.8
1.38
34.9
29.31
744.5
31.31
795.3
33.31
846.1
35.44
900.1
37.69
957.3
39.75
1009.6
46.12
1171.6
52.56
1335.1
58.75
1492.2
65.44
1662.1
139
63
163
74
176
80
203
92
249
113
284
129
406
184
509
231
632
287
855
388
5.69
144.5
5.88
149.2
6.22
158.0
6.62
168.3
6.81
173.0
7.12
181.0
8.06
204.8
8.81
223.8
9.44
239.7
10.69
271.5
.56
14.3
.56
14.3
.56
14.3
.62
15.9
.62
15.9
.62
15.9
.62
15.9
.62
15.9
.62
15.9
.69
17.5
32
32
36
36
36
36
32
32
36
36
32
32
36
36
40
40
48
48
40
40
1.38
34.9
1.38
34.9
1.50
38.1
1.62
41.3
1.62
41.3
1.75
44.4
1.88
47.6
2.00
50.8
2.00
50.8
2.38
60.3
31.62
803.3
33.75
857.2
36.25
920.8
38.50
977.9
40.62
1031.9
42.88
1089.0
49.00
1244.6
55.75
1416.0
62.12
1578.0
69.44
1736.7
399
181
447
203
590
268
727
330
787
357
893
405
1252
568
1611
731
1979
898
2890
1311
3
HUB DIA.
AT BASE
X
CLASS 150
26.94
684.2
28.94
735.0
31.00
787.4
33.06
839.8
35.12
892.2
37.19
944.6
43.38
1101.7
49.50
1257.3
55.62
1412.9
61.81
1570.0
CLASS 300
26
650
28
700
30
750
32
800
34
850
4
36
900
42
1100
48
1200
54
1400
60
1500
34.12
867
36.25
921
39.00
991
41.50
1054
43.62
1108
46.12
1172
52.50
1334
59.50
1511
65.88
1673
73.94
1878
3.50
88.9
3.50
88.9
3.69
93.7
4.06
103.2
4.06
103.2
4.06
103.2
4.69
119.1
5.06
128.6
5.38
136.5
5.94
150.8
29.00
736.6
31.00
787.4
33.25
844.6
35.50
901.7
37.50
952.5
39.75
1009.6
46.00
1168.4
52.25
1327.2
58.25
1479.6
65.00
1651.0
As
specified
by
Customer
1
Also available in Class 75. Particulars upon request.
2
Materials covered in this Standard are the same as ASME/ANSI
B16.5 except nickel base alloys are excluded.
3
Flange Thickness C and Length through Hub Y includes .06"
(1.6 mm) raised face.
FOR DETAILS OF WELDING BEVEL, REFER TO PAGE 48.
26.19
665.2
28.19
716.0
30.25
768.4
32.25
819.2
34.25
870.0
36.25
920.8
42.31
1074.7
48.31
1227.1
54.31
1379.5
60.31
1531.9
27.62
701.7
29.75
755.6
32.00
812.8
34.00
863.6
36.12
917.6
38.00
965.2
44.00
1117.6
50.31
1277.9
56.50
1435.1
62.94
1598.6
Materials extracted from API STANDARD 605, Second Edition, October 1978, Large Diameter
Carbon Steel Flanges (Nominal Pipe Size 26 to 60, inclusive; Classes 75, 150 and 300) Tables 3,
B-2 and B-3, reprinted by courtesy of the American Petroleum Institute.
• 46 •
INCHES
POUNDS
MILLIMETRES
KILOGRAMS
IDENTIFICATION
CCTF flanges, where the size and design permits, are marked with the following identification data in
accordance with ASME/ANSI B16.5:
Trade Mark or name
Nominal size
Primary service pressure
B16 (ANSI designation)
Material designation
Heat code
FORGED FLANGE TOLERANCES
Millimetres in brackets
DIMENSION
WELDING NECK
& SOCK. WELD
SLIP-ON &
SOCK. WELD.
THREADED
LAP
JOINT
BLIND
1
Outside Diameter
Flange O.D. 24 or less (609.6)
Flange O.D. over 24 (609.6)
± .06 (1.6)
±.12 (3.2)
±.06 (1.6)
±.12 (3.2)
±.06 (1.6
±.12 (3.2)
±.06 (1.6)
—.12 (3.2)
±.06 (1.6)
±.12 (3.2)
Bore
NPS 10 (DN 250) & less
±.03 (0.8)2
NPS 12 - 18 (DN 300 - 450)
±.06 (1.6)2
NPS 20 (DN 500) & over
+ .12 (3.2)2
—.06 (1.6)
+.03 (0.8)4
—0
+.06 (1.6)4
—0
+.06 (1.6)4
—0
+.03 (0.8)
—0
+.06 (1.6)
—0
+.06 (1.6)
—0
+.03 (0.8)
—0
+.06 (1.6)
—0
+.06 (1.6)
—0
—
—
—
—
—
—
NPS 18 (DN 450) & less)
+.12 (3.2)
—0
+.12 (3.2)
—0
+.12 (3.2)
—0
+.12 (3.2)
—0
+.12 (3.2)
—0
NPS 20 (DN 500) & over
+.19 (4.8)
—0
+19 (4.8)
—0
+.19 (4.8)
—0
+.19 (4.8)
—0
+.19 (4.8)
—0
Raised Face Diameter
.06 (1.6) raised face
.25 (6.4) raised face
±.03 (0.8)
±.02 (0.5)
±.03 (0.8)
±.02 (0.5)
±.03 (0.8)
±.02 (0.5)
—
—
±.03 (0.8)
±.02 (0.5)
Drilling
Bolt circle
Bolt hole spacing
NPS 2 1/2 (DN 65) & less
NPS 3 (DN 80) & larger
NPS 4 & less ±.06
NPS 5 to 10 +.06 -.12
NPS 12 & larger +.12 -.18
NPS 12 (DN 300) & less
±.06 (1.6)
±.03 (0.8)
.03 (0.8) max.
.06 (1.6) max.
—
—
—
±.09 (2.4)
-.06 (1.6)
±.12 (3.2)
±.06 (1.6)
±.03 (.08)
.03 (0.8) max.
.06 (1.6) max.
—
—
—
±.09 (2.4)
-.06 (1.6)
±.12 (3.2)
±.06 (1.6)
±.03 (0.8)
.03 (0.8) max.
.06 (1.6) max.
—
—
—
±.09 (2.4)
-.06 (1.6)
±.12 (3.2)
±.06 (1.6)
±.03 (0.8)
.03 (0.8) max.
.06 (1.6) max.
—
—
—
±.09 (2.4)
-.06 (1.6)
±.12 (3.2)
±.06 (1.6)
±.03 (0.8)
—
—
—
—
—
—
—
—
NPS 5 (DN 125) & less
+.09 (2.4)
-.03 (0.8)
—
—
—
—
—
—
—
—
NPS 6 (DN 150) & over
+.16 (4.0)
±.03 (0.8)
—
—
—
—
—
—
—
—
Flange Thickness
Eccentricity
3
Length Thru Hub
(Welding Neck Flanges)
Diameter of Hub at Base
1
NPS 14 (DN 350) & over)
Diameter of Hub at Bevel
Thickness of Hub at Bevel
All sizes of welding neck
1
These tolerances not covered by ASME/ANSI B16.5.
2
Welding Neck and Socket Welding small bore.
3
Between bolt circle diameter and machined facing diameter.
4
Socket Welding Socket.
Minimum, —12 1/2& of matching nominal pipe wall thickness
• 47 •
WELDING BEVELS - (WELD NECK FLANGES NO BACKING RINGS)
ASME/ANSI B16.5, ASME B16.47
ASME/ANSI B16.5, ASME B16.47
Nominal pipe wall thickness T = 0.88 (22.2 mm) max.
For wall thickness less than 0.19 in. (4.8) mm) for
carbon and ferritic alloy steel, and 0.125 in. (3.2 mm)
austenitic alloy steel, ends may be cut square or
slightly chamfered at manufacturer’s option.
T = more than 0.88" (22.4 mm)
Although great care has been taken in compiling the
information contained in this catalogue, CCTF does
not accept responsibility for the consequences of any
errors, nor for the effects of any subsequent changes
made by the various sources of data.
Catalogue Section 3
• 48 •
FSF