GORE® Sealant
Technologies
GASKET DIMENSIONS ASME B16.21 - 2016
Gasket Type: Flat Ring
Dimensions in mm
Nominal Size
NPS
DN
½
¾
1
1¼
1½
2
2½
3
3½
4
5
6
8
10
12
14
16
18
20
24
26
28
30
32
A
B
C
Standard ID
[mm]
GLS ID
[mm]
NPS ID
[mm]
Class 150
21
27
33
42
48
60
73
89
102
114
141
168
219
273
324
356
406
457
508
610
660
711
762
813
18
25
31
38
46
57
70
85
–
110
133
159
210
265
315
345
390
445
495
595
–
–
–
–
13
19
25
32
38
51
64
76
89
102
127
152
203
254
305
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
48
57
67
76
86
105
124
137
162
175
197
222
279
340
410
451
514
549
606
718
775
832
883
940
15
20
25
32
40
50
65
80
90
100
125
150
200
250
300
350
400
450
500
600
650
700
750
800
Outside Diameter [mm]
Class 300 Class 400 Class 600
54
67
73
83
95
111
130
149
165
181
216
251
308
362
422
486
540
597
654
775
835
899
953
1006
54
67
73
83
95
111
130
149
162
178
213
248
305
359
419
483
537
594
648
768
832
892
946
1003
54
67
73
83
95
111
130
149
162
194
241
267
321
400
457
492
565
613
683
791
867
914
972
1022
Class 900
64
70
79
89
98
143
165
168
–
206
248
289
359
435
498
521
575
638
699
838
–
–
–
–
ID: Inside Diameter GLS: Glass-Lined Steel NPS: Nominal Pipe Size
* NPS ID (“old standard”) exists up to NPS12 only. For gaskets larger than NPS12, select Standard ID or GLS ID as appropriate.
Some sizes may not be available for some
GORE® Gasketing products.
A
Dimensions applicable to:
▪
▪
ASME B16.5 Pipe Flanges
ASME B16.47 Series A, Large Diameter Steel Flanges
Tolerances
▪
▪
B
Inside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
± 1.5 mm
± 3.0 mm
Outside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
+ 0 / – 1.5 mm
+ 0 / – 3.0 mm
Standard/ID Option
ASME B16.21
EN 1514-1
Comments/Use
ID per applicable standard
General use in steel flanges
Standard/ID Option
ASME B16.21 / GLS ID
EN 1514-1 / GLS ID
A
Comments/Use
ID reduced to protect glass lining
Best option for glass lined steel flanges
C
Standard/ID Option
ASME B16.21 / NPS ID
C
Comments/Use
ID equals nominal pipe size in inches
(“old standard”)
Required for ductile iron pipe and
other specialty applications
B
Gasket Type: Flat Ring
Dimensions in inch
Nominal Size
NPS
DN
½
¾
1
1¼
1½
2
2½
3
3½
4
5
6
8
10
12
14
16
18
20
24
26
28
30
32
A
B
C
Standard ID
[inch]
GLS ID
[inch]
NPS ID
[inch]
Class 150
0.84
1.06
1.31
1.66
1.91
2.38
2.88
3.50
4.00
4.50
5.56
6.62
8.62
10.75
12.75
14.00
16.00
18.00
20.00
24.00
26.00
28.00
30.00
32.00
0.71
0.98
1.22
1.50
1.81
2.24
2.76
3.35
–
4.33
5.24
6.26
8.27
10.43
12.40
13.58
15.35
17.52
19.49
23.43
–
–
–
–
0.50
0.75
1.00
1.25
1.50
2.00
2.50
3.00
3.50
4.00
5.00
6.00
8.00
10.00
12.00
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
1.88
2.25
2.62
3.00
3.38
4.12
4.88
5.38
6.38
6.88
7.75
8.75
11.00
13.37
16.13
17.75
20.25
21.62
23.88
28.25
30.50
32.75
34.75
37.00
15
20
25
32
40
50
65
80
90
100
125
150
200
250
300
350
400
450
500
600
650
700
750
800
Outside Diameter [inch]
Class 300 Class 400 Class 600
2.12
2.62
2.88
3.25
3.75
4.38
5.12
5.88
6.50
7.12
8.50
9.88
12.12
14.25
16.62
19.12
21.25
23.50
25.75
30.50
32.88
35.38
37.50
39.62
2.12
2.62
2.88
3.25
3.75
4.38
5.12
5.88
6.38
7.00
8.38
9.75
12.00
14.12
16.50
19.00
21.12
23.38
25.50
30.25
32.75
35.12
37.25
39.50
2.12
2.62
2.88
3.25
3.75
4.38
5.12
5.88
6.38
7.62
9.50
10.50
12.62
15.75
18.00
19.38
22.25
24.12
26.88
31.12
34.12
36.00
38.25
40.25
Class 900
2.50
2.75
3.12
3.50
3.88
5.62
6.50
6.62
–
8.12
9.75
11.38
14.12
17.12
19.62
20.50
22.62
25.12
27.50
33.00
–
–
–
–
ID: Inside Diameter GLS: Glass-Lined Steel NPS: Nominal Pipe Size
* NPS ID (“old standard”) exists up to NPS12 only. For gaskets larger than NPS12, select Standard ID or GLS ID as appropriate.
Some sizes may not be available for some
GORE® Gasketing products.
A
Dimensions applicable to:
▪
▪
ASME B16.5 Pipe Flanges
ASME B16.47 Series A, Large Diameter Steel Flanges
Tolerances
▪
▪
B
Inside Diameter:
For NPS 12 and smaller:
For NPS 14 and larger:
± 0.06 inch
± 0.12 inch
Outside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
+ 0 / – 0.06 inch
+ 0 / – 0.12 inch
Standard/ID Option
ASME B16.21
EN 1514-1
Comments/Use
ID per applicable standard
General use in steel flanges
Standard/ID Option
ASME B16.21 / GLS ID
EN 1514-1 / GLS ID
A
Comments/Use
ID reduced to protect glass lining
Best option for glass lined steel flanges
C
Standard/ID Option
ASME B16.21 / NPS ID
C
Comments/Use
ID equals nominal pipe size in inches
(“old standard”)
Required for ductile iron pipe and
other specialty applications
B
Gasket Type: Full Face
Dimensions in mm
Nominal Size
NPS
DN
½
¾
1
1¼
1½
2
2½
3
3½
4
5
6
8
10
12
14
16
18
20
24
26
28
30
32
15
20
25
32
40
50
65
80
90
100
125
150
200
250
300
350
400
450
500
600
650
700
750
800
A
C
Standard ID
[mm]
NPS ID
[mm]
21
27
33
42
48
60
73
89
102
114
141
168
219
273
324
356
406
457
508
610
660
711
762
813
13
19
25
32
38
51
64
76
89
102
127
152
203
254
305
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
Class 150
OD
[mm]
#
89
98
108
117
127
152
178
191
216
229
254
279
343
406
483
533
597
635
699
813
870
925
985
1060
4
4
4
4
4
4
4
4
8
8
8
8
8
12
12
12
16
16
20
20
24
28
28
28
ID: Inside Diameter OD: Outside Diameter NPS: Nominal Pipe Size
Class 300
[inch]
BC
[mm]
OD
[mm]
#
[inch]
BC
[mm]
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1-1/8
1-1/8
1-1/4
1-1/4
1-3/8
1-3/8
1-3/8
1-3/8
1-5/8
60.3
69.9
79.4
88.9
98.4
120.7
139.7
152.4
177.8
190.5
215.9
241.3
298.5
362.0
431.8
476.3
539.8
577.9
635.0
749.3
806.4
863.6
914.4
977.9
95
115
125
135
155
165
190
210
230
255
280
320
380
445
520
585
650
710
775
915
970
1035
1090
1150
4
4
4
4
4
8
8
8
8
8
8
12
12
16
16
20
20
24
24
24
28
28
28
28
5/8
3/4
3/4
3/4
7/8
3/4
7/8
7/8
7/8
7/8
7/8
7/8
1
1-1/8
1-1/4
1-1/4
1-3/8
1-3/8
1-3/8
1-5/8
1-3/4
1-3/4
1-7/8
2
66.7
82.6
88.9
98.4
114.3
127.0
149.2
168.3
184.2
200.0
235.0
269.9
330.2
387.4
450.8
514.4
571.5
628.6
685.8
812.8
876.3
939.8
997.0
1054.1
: Diameter of bolt hole #: Number of bolt holes BC: Diameter of bolt hole circle
* NPS ID (“old standard”) exists up to NPS12 only. For gaskets larger than NPS12, select Standard ID or GLS ID as appropriate.
NOTE: Class 300 Dimensions per B16.5-2013. NPS 26 - NPS 32 Class 150 & Class 300 Dimensions per B16.47 Series A
Some sizes may not be available for some
GORE® Gasketing products.
A
Dimensions applicable to:
▪
▪
ASME B16.5 Pipe Flanges
ASME B16.47 Series A, Large Diameter Steel Flanges
▪
▪
Inside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
± 1.5 mm
± 3.0 mm
Outside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
+ 0 / – 1.5 mm
+ 0 / – 3.0 mm
Bolt:
Bolt circle diameter
Adjacent bolt holes center to center
± 1.5 mm
± 1 mm
Comments/Use
ID per applicable standard
General use in steel flanges
Standard/ID Option
ASME B16.21 / NPS ID
Tolerances
▪
Standard/ID Option
ASME B16.21
EN 1514-1
C
Comments/Use
ID equals nominal pipe size in inches
(“old standard”)
Required for ductile iron pipe and
other specialty applications
A
C
Gasket Type: Full Face
Dimensions in inch
Nominal Size
NPS
DN
½
¾
1
1¼
1½
2
2½
3
3½
4
5
6
8
10
12
14
16
18
20
24
26
28
30
32
15
20
25
32
40
50
65
80
90
100
125
150
200
250
300
350
400
450
500
600
650
700
750
800
A
C
Standard ID
[inch]
NPS ID
[inch]
0.84
1.06
1.31
1.66
1.91
2.38
2.88
3.50
4.00
4.50
5.56
6.62
8.62
10.75
12.75
14.00
16.00
18.00
20.00
24.00
26.00
28.00
30.00
32.00
0.50
0.75
1.00
1.25
1.50
2.00
2.50
3.00
3.50
4.00
5.00
6.00
8.00
10.00
12.00
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
N/A*
Class 150
OD
[inch]
#
3.50
3.88
4.25
4.63
5.00
6.00
7.00
7.50
8.50
9.00
10.00
11.00
13.50
16.00
19.00
21.00
23.50
25.00
27.50
32.00
34.25
36.50
38.75
41.75
4
4
4
4
4
4
4
4
8
8
8
8
8
12
12
12
16
16
20
20
24
28
28
28
ID: Inside Diameter OD: Outside Diameter NPS: Nominal Pipe Size
Class 300
[inch]
BC
[inch]
OD
[inch]
#
[inch]
BC
[inch]
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1-1/8
1-1/8
1-1/4
1-1/4
1-3/8
1-3/8
1-3/8
1-3/8
1-5/8
2.38
2.75
3.12
3.50
3.88
4.75
5.50
6.00
7.00
7.50
8.50
9.50
11.75
14.25
17.00
18.75
21.25
22.75
25.00
29.50
31.75
34.00
36.00
38.50
3.75
4.62
4.88
5.25
6.12
6.50
7.50
8.25
9.00
10.00
11.00
12.50
15.00
17.50
20.50
23.00
25.50
28.00
30.50
36.00
38.25
40.75
43.00
45.25
4
4
4
4
4
8
8
8
8
8
8
12
12
16
16
20
20
24
24
24
28
28
28
28
5/8
3/4
3/4
3/4
7/8
3/4
7/8
7/8
7/8
7/8
7/8
7/8
1
1-1/8
1-1/4
1-1/4
1-3/8
1-3/8
1-3/8
1-5/8
1-3/4
1-3/4
1-7/8
2
2.62
3.25
3.50
3.88
4.50
5.00
5.88
6.62
7.25
7.88
9.25
10.62
13.00
15.25
17.75
20.25
22.50
24.75
27.00
32.00
34.50
37.00
39.25
41.50
: Diameter of bolt hole #: Number of bolt holes BC: Diameter of bolt hole circle
* NPS ID (“old standard”) exists up to NPS12 only. For gaskets larger than NPS12, select Standard ID or GLS ID as appropriate.
NOTE: Class 300 Dimensions per B16.5-2013. NPS 26 - NPS 32 Class 150 & Class 300 Dimensions per B16.47 Series A
A
Dimensions applicable to:
▪
▪
ASME B16.5 Pipe Flanges
ASME B16.47 Series A, Large Diameter Steel Flanges
▪
▪
Inside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
± 0.06 inch
± 0.12 inch
Outside Diameter:
For NPS 12 and smaller
For NPS 14 and larger
+ 0 / – 0.06 inch
+ 0 / – 0.12 inch
Bolt
Bolt circle diameter
Adjacent bolt holes center to center
± 0.06 inch
± 0.04 inch
Comments/Use
ID per applicable standard
General use in steel flanges
Standard/ID Option
ASME B16.21 / NPS ID
Tolerances
▪
Standard/ID Option
ASME B16.21
EN 1514-1
C
Comments/Use
ID equals nominal pipe size in inches
(“old standard”)
Required for ductile iron pipe and
other specialty applications
FOR INDUSTRIAL USE ONLY. Not for use in food, drug, cosmetic or medical device manufacturing, processing, or
packaging operations. All technical information and advice given here is based on Gore’s previous experiences and/or test
results. Gore gives this information to the best of its knowledge, but assumes no legal responsibility. Customers are asked to
check the suitability and usability in the specific application, since the performance of the product can only be judged when all
necessary operating data are available. The above information is subject to change and is not to be used for specification
purposes. Gore’s terms and conditions of sale apply to the sale of the products by Gore.
GORE, Together, improving life and designs are trademarks of W. L. Gore & Associates. © 2023 W. L. Gore & Associates GmbH
A
C
SEAL-124-R2-TEC-EN-MAR23
Some sizes may not be available for some
GORE® Gasketing products.