J.W. DONCHIN CO. 4841-43 W. Chicago Ave. • Chicago, IL 60651-3224
Ph: 773-261-2182 • Fax: 773-261-2867 • Sales@jwdonchin.com • www.jwdonchin,com
REFERENCE TABLES
Contents
Page
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
Description
Range
REFERENCE TABLES
Metric and English Equivalents
Inch to Millimeter Conversion Table
Millimeter to Inch Conversion Table
Decimal Equivalents of 8ths, 16ths, 32nds, 64ths
Decimal Equivalents of Number Size Drills
American Standard Pipe Thread and Tap Drill Sizes
American National and Unified Coarse and
Fine Thread Dimensions and Tap Drill Sizes
American National and Unified Coarse and
Fine Thread Dimensions and Tap Drill Sizes (continued)
Millimeter Tap Drill Sizes
Tap Drill Sizes For Fractional Size Threads
Approximately 65% Depth Thread / AMERICAN NATIONAL THREAD FORM
Double Depth of Screw Threads
ISO External Threads Medium Fit
American Standard Acme Screw Thread Dimensions
Tapers and Angles
General Guide for Cutting Speeds and Feeds for Drills
Guide for Drill Feeds
Guide for Peripheral Speeds
Pitch Diameter Tables – American National Thread Form
For Nos. 575 and 585 Screw Thread Micrometers
Pitch Diameter Tables
For Nos. 575 and 585 Screw Thread Micrometers
Pitch Diameter Table
For Nos. 575 and 585 Screw Thread Micrometers “V” Standard Thread Form
American Standard Acme Screw Thread Dimensions
Temperature Conversion
High Temperatures Judged by Color and Colors for Tempering
Rules Relative to the Circle
Standards for Sheet and Wire Gages with corresponding Starrett Gages
Dimensions of Sizes in Decimal Parts of an Inch
Triangle Chart
For the Rapid Solution of Right-Angle and Oblique-Angle Triangles
ⴞ关 .001 兴
REFERENCE TABLES
⫹
⭿
⯝
ⱡ
FPM
ⳝ
mm
ⱢInch
Ⱕ
ⱔ⬏⬐⬍⬎
ⱡ
ⴚ ⴛⴜⴝ
a
b
REFERENCE TABLES
Metric and English Equivalents
Linear Measure
Metric to Inch
Inch to Metric
1 millimeter = 0.03937 inch
1 centimeter = 0.3937 inch
39.37 inches
1 meter = 3.2808 feet
1.0936 yards
1 kilometer = 0.6214 mile
1 inch =
{
1 foot =
millimeters
{ 25.4
2.54 centimeters
millimeters
{ 304.8
0.3048 meter
1 yard = 0.9144 meter
1 mile = 1.609 kilometers
Square Measure
Metric to Inch
1 square millimeter = 0.00155 square inch
1 square centimeter = 0.155 square inch
1 square meter = 10.764 square feet = 1.196 square yards
1 are = 0.0247 acre = 1076.4 square feet
1 hectare = 2.471 acres = 107,639 square feet
1 square kilometer = 0.3861 square mile = 247.1 acres
Inch to Metric
1 square inch = 6.452 square centimeters = 645.2 square millimeters
1 square foot = 0.0929 square meter = 929 square centimeters
1 square yard = 0.836 square meter
1 acre = 0.4047 hectare = 40.47 ares
1 square mile = 2.5900 square kilometers
Cubic Measure
Metric to English
1 liter = 0.2642 U.S. gallon = 1.0567 U.S. quarts
1 liter (cubic decimeter) = 0.0353 cubic foot = 61.024 cubic inches
1 cubic centimeter = 0.061 cubic inch
1 cubic meter = 264.2 U.S. gallons
1 cubic meter = 35.315 cubic feet = 1.308 cubic yards
English to Metric
1 U.S. quart = 0.946 liter
1 U.S. gallon = 3.785 liters = 231 cubic inches
1 cubic inch = 16.38706 cubic centimeters
1 cubic foot = 0.02832 cubic meter = 28.317 liters
1 cubic yard = 0.7646 cubic meter
Weight
Metric to English
1 gram = 15.432 grains
1 gram = 0.03527 ounce avoirdupois (Commercial)
1 kilogram = 2.2046 pounds = 35.274 ounces avoirdupois
(Commercial)
1 metric ton = 0.9842 ton (of 2240 pounds) = 2204.6 pounds
648
English to Metric
1 grain = 0.0648 gram
1 ounce avoirdupois (Commercial) = 28.35 grams
1 pound = 0.4536 kilogram = 453.6 grams
1 short ton (2,000 pounds) = .907 metric ton = 907 kilograms
1 long ton (2,240 pounds) = 1.016 metric ton = 1016 kilograms
REFERENCE TABLES
Inch to Millimeter Conversion Table
Decimals to Millimeters
Fractions to Decimals to Millimeters
Decimal
mm
Decimal
mm
Fraction
Decimal
mm
Fraction
Decimal
mm
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.0254
0.0508
0.0762
0.1016
0.1270
0.1524
0.1778
0.2032
0.2286
0.0156
0.0312
0.0469
0.3969
0.7938
1.1906
33/64
17/32
35/64
0.5156
0.5312
0.5469
13.0969
13.4938
13.8906
1/16
0.0625
1.5875
9/16
0.5625
14.2875
0.2540
0.5080
0.7620
1.0160
1.2700
1.5240
1.7780
2.0320
2.2860
12.7000
12.9540
13.2080
13.4620
13.7160
13.9700
14.2240
14.4780
14.7320
14.9860
1/64
1/32
3/64
0.010
0.020
0.030
0.040
0.050
0.060
0.070
0.080
0.090
0.500
0.510
0.520
0.530
0.540
0.550
0.560
0.570
0.580
0.590
5/64
3/32
7/64
0.0781
0.0938
0.1094
1.9844
2.3812
2.7781
37/64
19/32
39/64
0.5781
0.5938
0.6094
14.6844
15.0812
15.4781
0.1250
3.1750
5/8
0.6250
15.8750
2.5400
2.7940
3.0480
3.3020
3.5560
3.8100
4.0640
4.3180
4.5720
4.8260
15.2400
15.4940
15.7480
16.0020
16.2560
16.5100
16.7640
17.0180
17.2720
17.5260
1/8
0.100
0.110
0.120
0.130
0.140
0.150
0.160
0.170
0.180
0.190
0.600
0.610
0.620
0.630
0.640
0.650
0.660
0.670
0.680
0.690
9/64
5/32
11/64
0.1406
0.1562
0.1719
3.5719
3.9688
4.3656
41/64
21/32
43/64
0.6406
0.6562
0.6719
16.2719
16.6688
17.0656
3/16
0.1875
4.7625
11/16
0.6875
17.4625
0.2031
0.2188
0.2344
5.1594
5.5562
5.9531
45/64
23/32
47/64
0.7031
0.7188
0.7344
17.8594
18.2562
18.6531
5.0800
5.3340
5.5880
5.8420
6.0690
6.3500
6.6040
6.8580
7.1120
7.3660
17.7800
18.0340
18.2880
18.5420
18.7960
19.0500
19.3040
19.5580
19.8120
20.0660
13/64
7/32
15/64
0.200
0.210
0.220
0.230
0.240
0.250
0.260
0.270
0.280
0.290
0.700
0.710
0.720
0.730
0.740
0.750
0.760
0.770
0.780
0.790
1/4
0.2500
6.3500
3/4
0.7500
19.0500
17/64
9/32
19/64
0.2656
0.2812
0.2969
6.7469
7.1438
7.5406
49/64
25/32
51/64
0.7656
0.7812
0.7969
19.4469
19.8438
20.2406
0.3125
7.9375
13/16
0.8125
20.6375
7.6200
7.8740
8.1280
8.3820
8.6360
8.8900
9.1440
9.3980
9.6520
9.9060
20.3200
20.5740
20.8280
21.0820
21.3360
21.5900
21.8440
22.0980
22.3520
22.6060
5/16
0.300
0.310
0.320
0.330
0.340
0.350
0.360
0.370
0.380
0.390
0.800
0.810
0.820
0.830
0.840
0.850
0.860
0.870
0.880
0.890
21/64
11/32
23/64
0.3281
0.3438
0.3594
8.3344
8.7312
9.1281
53/64
27/32
55/64
0.8281
0.8438
0.8594
21.0344
21.4312
21.8281
3/8
0.3750
9.5250
7/8
0.8750
22.2250
9.9219
10.3188
10.7156
57/64
29/32
59/64
0.8906
0.9062
0.9219
22.6219
23.0188
23.4156
10.1600
10.4140
10.6680
10.9220
11.1760
11.4300
11.6840
11.9380
12.1920
12.4460
22.8600
23.1140
23.3680
23.6220
23.8760
24.1300
24.3840
24.6380
24.8920
25.1460
25.4000
0.3906
0.4062
0.4219
0.400
0.410
0.420
0.430
0.440
0.450
0.460
0.470
0.480
0.490
0.900
0.910
0.920
0.930
0.940
0.950
0.960
0.970
0.980
0.990
1.000
25/64
13/32
27/64
7/16
0.4375
11.1125
15/16
0.9375
23.8125
29/64
15/32
31/64
0.4531
0.4688
0.4844
11.5094
11.9062
12.3031
61/64
31/32
63/64
0.9531
0.9688
0.9844
24.2094
24.6062
25.0031
1/2
0.5000
12.700
1.0000
25.4000
1
649
REFERENCE TABLES
Millimeter to Inch Conversion Table
mm
Decimal
mm
Decimal
mm
Decimal
mm
Decimal
mm
Decimal
0.01
0.02
0.03
0.04
0.05
.00039
.00079
.00118
.00157
.00197
0.41
0.42
0.43
0.44
0.45
.01614
.01654
.01693
.01732
.01772
0.81
0.82
0.83
0.84
0.85
.03189
.03228
.03268
.03307
.03346
21
22
23
24
25
.82677
.86614
.90551
.94488
.98425
61
62
63
64
65
2.40157
2.44094
2.48031
2.51969
2.55906
0.06
0.07
0.08
0.09
0.10
.00236
.00276
.00315
.00354
.00394
0.46
0.47
0.48
0.49
0.50
.01811
.01850
.01890
.01929
.01969
0.86
0.87
0.88
0.89
0.90
.03386
.03425
.03465
.03504
.03543
26
27
28
29
30
1.02362
1.06299
1.10236
1.14173
1.18110
66
67
68
69
70
2.59843
2.63780
2.67717
2.71654
2.75591
0.11
0.12
0.13
0.14
0.15
.00433
.00472
.00512
.00551
.00591
0.51
0.52
0.53
0.54
0.55
.02008
.02047
.02087
.02126
.02165
0.91
0.92
0.93
0.94
0.95
.03583
.03622
.03661
.03701
.03740
31
32
33
34
35
1.22047
1.25984
1.29921
1.33858
1.37795
71
72
73
74
75
2.79528
2.83465
2.87402
2.91339
2.95276
0.16
0.17
0.18
0.19
0.20
.00630
.00669
.00709
.00748
.00787
0.56
0.57
0.58
0.59
0.60
.02205
.02244
.02283
.02323
.02362
0.96
0.97
0.98
0.99
1.00
.03780
.03819
.03858
.03898
.03937
36
37
38
39
40
1.41732
1.45669
1.49606
1.53543
1.57480
76
77
78
79
80
2.99213
3.03150
3.07087
3.11024
3.14961
0.21
0.22
0.23
0.24
0.25
.00827
.00866
.00906
.00945
.00984
0.61
0.62
0.63
0.64
0.65
.02402
.02441
.02480
.02520
.02559
1
2
3
4
5
.03937
.07874
.11811
.15748
.19685
41
42
43
44
45
1.61417
1.65354
1.69291
1.73228
1.77165
81
82
83
84
85
3.18898
3.22835
3.26772
3.30709
3.34646
0.26
0.27
0.28
0.29
0.30
.01024
.01063
.01102
.01142
.01181
0.66
0.67
0.68
0.69
0.70
.02598
.02638
.02677
.02717
.02756
6
7
8
9
10
.23622
.27559
.31496
.35433
.39370
46
47
48
49
50
1.81102
1.85039
1.88976
1.92913
1.96850
86
87
88
89
90
3.38583
3.42520
3.46457
3.50394
3.54331
0.31
0.32
0.33
0.34
0.35
.01220
.01260
.01299
.01339
.01378
0.71
0.72
0.73
0.74
0.75
.02795
.02835
.02874
.02913
.02953
11
12
13
14
15
.43307
.47244
.51181
.55118
.59055
51
52
53
54
55
2.00787
2.04724
2.08661
2.12598
2.16535
91
92
93
94
95
3.58268
3.62205
3.66142
3.70079
3.74016
0.36
0.37
0.38
0.39
0.40
.01417
.01457
.01496
.01535
.01575
0.76
0.77
0.78
0.79
0.80
.02992
.03031
.03071
.03110
.03150
16
17
18
19
20
.62992
.66929
.70866
.74803
.78740
56
57
58
59
60
2.20472
2.24409
2.28346
2.32283
2.36220
96
97
98
99
100
3.77953
3.81890
3.85827
3.89764
3.93701
650
REFERENCE TABLES
Decimal Equivalents of 8ths, 16ths, 32nds, 64ths
8ths
32nds
64ths
64ths
1/8 = .125
1/32 = .03125
1/64 = .015625
33/64 = .515625
1/4 = .250
3/32 = .09375
3/64 = .046875
35/64 = .546875
3/8 = .375
5/32 = .15625
5/64 = .078125
37/64 = .578125
1/2 = .500
7/32 = .21875
7/64 = .109375
39/64 = .609375
9/32 = .28125
9/64 = .140625
41/64 = .640625
11/32 = .34375
11/64 = .171875
43/64 = .671875
13/32 = .40625
13/64 = .203125
45/64 = .703125
15/32 = .46875
15/64 = .234375
47/64 = .734375
17/32 = .53125
17/64 = .265625
49/64 = .765625
19/32 = .59375
19/64 = .296875
51/64 = .796875
21/32 = .65625
21/64 = .328125
53/64 = .828125
7/16 = .4375
23/32 = .71875
23/64 = .359375
55/64 = .859375
9/16 = .5625
25/32 = .78125
25/64 = .390625
57/64 = .890625
11/16 = .6875
27/32 = .84375
27/64 = .421875
59/64 = .921875
13/16 = .8125
29/32 = .90625
29/64 = .453125
61/64 = .953125
15/16 = .9375
31/32 = .96875
31/64 = .484375
63/64 = .984375
5/8 = .625
3/4 = .750
7/8 = .875
16ths
1/16 = .0625
3/16 = .1875
5/16 = .3125
Decimal Equivalents of Letter Size Drills
Letter
Size of Drill
in Inches
Letter
Size of Drill
in Inches
A
B
C
D
.234
.238
.242
.246
N
O
P
Q
.302
.316
.323
.332
E
F
G
H
.250
.257
.261
.266
R
S
T
U
.339
.348
.358
.368
I
J
K
L
M
.272
.277
.281
.290
.295
V
W
X
Y
Z
.377
.386
.397
.404
.413
651
REFERENCE TABLES
Decimal Equivalents of Number Size Drills
Size of
Drill in
Inches
No.
Size of
Drill in
Inches
No.
Size of
Drill in
Inches
No.
Size of
Drill in
Inches
1
.2280
21
.1590
41
.0960
61
.0390
2
.2210
22
.1570
42
.0935
62
.0380
3
.2130
23
.1540
43
.0890
63
.0370
4
.2090
24
.1520
44
.0860
64
.0360
5
.2055
25
.1495
45
.0820
65
.0350
6
.2040
26
.1470
46
.0810
66
.0330
7
.2010
27
.1440
47
.0785
67
.0320
8
.1990
28
.1405
48
.0760
68
.0310
9
.1960
29
.1360
49
.0730
69
.0292
10
.1935
30
.1285
50
.0700
70
.0280
11
.1910
31
.1200
51
.0670
71
.0260
12
.1890
32
.1160
52
.0635
72
.0250
13
.1850
33
.1130
53
.0595
73
.0240
14
.1820
34
.1110
54
.0550
74
.0225
15
.1800
35
.1100
55
.0520
75
.0210
16
.1770
36
.1065
56
.0465
76
.0200
17
.1730
37
.1040
57
.0430
77
.0180
18
.1695
38
.1015
58
.0420
78
.0160
19
.1660
39
.0995
59
.0410
79
.0145
20
.1610
40
.0980
60
.0400
80
.0135
No.
American Standard Pipe Thread and Tap Drill Sizes
Pipe Size
Inches
652
Threads
Per Inch
Root Diameter
Small End of
Pipe and Gage
Tap Drill
Taper NPT
Straight NPS
1/8
27
.3339⬙
Q
11/32⬙
1/4
18
.4329⬙
7/16⬙
7/16⬙
3/8
18
.5676⬙
9/16⬙
37/64⬙
1/2
14
.7013⬙
45/64⬙
23/32⬙
3/4
14
.9105⬙
29/32⬙
59/64⬙
1
11 1/2
1.1441⬙
1 9/64⬙
1 5/32⬙
1 1/4
11 1/2
1.4876⬙
1 31/64⬙
1 1/2⬙
1 1/2
11 1/2
1.7265⬙
1 47/64⬙
1 3/4⬙
2
11 1/2
2.1995⬙
2 13/64⬙
2 7/32⬙
REFERENCE TABLES
American National and Unified Coarse and
Fine Thread Dimensions and Tap Drill Sizes
p = pitch =
p
1
No. thread per inch
f
60º
d = depth = p X .649519
d
f
f = flat = p
8
pitch diameter = D – .6495
N
Size
Threads
per inch
NC
NF
UNC
UNF
Outside
Diameter
Inches
Pitch
Diameter
Inches
Root
Diameter
Inches
Tap Drill
Approx. 75%
Full Thread
Decimal
Equiv. of
Tap Drill
0
1
1
2
2
3
3
4
4
5
5
–
64
–
56
–
48
–
40
–
40
–
80
–
72
–
64
–
56
–
48
–
44
.0600
.0730
.0730
.0860
.0860
.0990
.0990
.1120
.1120
.1250
.1250
.0519
.0629
.0640
.0744
.0759
.0855
.0874
.0958
.0985
.1088
.1102
.0438
.0527
.0550
.0628
.0657
.0719
.0758
.0795
.0849
.0925
.0955
3/64⬙
53
53
50
50
47
46
43
42
38
37
.0469
.0595
.0595
.0700
.0700
.0785
.0810
.0890
.0935
.1015
.1040
6
6
8
8
10
10
12
12
32
–
32
–
24
–
24
–
–
40
–
36
–
32
–
28
.1380
.1380
.1640
.1640
.1900
.1900
.2160
.2160
.1177
.1218
.1437
.1460
.1629
.1697
.1889
.1928
.0974
.1055
.1234
.1279
.1359
.1494
.1619
.1696
36
33
29
29
26
21
16
15
.1065
.1130
.1360
.1360
.1470
.1590
.1770
.1800
1/4⬙
1/4⬙
5/16⬙
5/16⬙
3/8⬙
3/8⬙
7/16⬙
7/16⬙
1/2⬙
1/2⬙
20
–
18
–
16
–
14
–
13
–
–
28
–
24
–
24
–
20
–
20
.2500
.2500
.3125
.3125
.3750
.3750
.4375
.4375
.5000
.5000
.2175
.2268
.2764
.2854
.3344
.3479
.3911
.4050
.4500
.4675
.1850
.2036
.2403
.2584
.2938
.3209
.3447
.3726
.4001
.4351
7
3
25/64⬙
27/64⬙
29/64⬙
.2010
.2130
.2570
.2720
.3125
.3320
.3680
.3906
.4219
.4531
9/16⬙
9/16⬙
5/8⬙
5/8⬙
3/4⬙
3/4⬙
7/8⬙
7/8⬙
12
–
11
–
10
–
9
–
–
18
–
18
–
16
–
14
.5625
.5625
.6250
.6250
.7500
.7500
.8750
.8750
.5084
.5264
.5660
.5889
.6850
.7094
.8028
.8286
.4542
.4903
.5069
.5528
.6201
.6688
.7307
.7822
31/64⬙
33/64⬙
17/32⬙
37/64⬙
21/32⬙
11/16⬙
49/64⬙
13/16⬙
.4844
.5156
.5312
.5781
.6562
.6875
.7656
.8125
(Continued on next page.)
F
I
5/16⬙
Q
U
653
REFERENCE TABLES
American National and Unified Coarse and
Fine Thread Dimensions and Tap Drill Sizes (continued)
Size
Threads
per inch
NC
NF
UNC
UNF
1⬙
1⬙
1 1/8⬙
1 1/8⬙
1 1/4⬙
8
–
7
–
7
–
12
–
12
–
1.0000
1.0000
1.1250
1.1250
1.2500
.9188
.9459
1.0322
1.0709
1.1572
.8376
.8917
.9394
1.0168
1.0644
7/8⬙
59/64⬙
63/64⬙
1 3/64⬙
1 7/64⬙
.8750
.9219
.9844
1.0469
1.1094
1 1/4⬙
1 3/8⬙
1 3/8⬙
1 1/2⬙
–
6
–
6
12
–
12
–
1.2500
1.3750
1.3750
1.5000
1.1959
1.2667
1.3209
1.3917
1.1418
1.1585
1.2668
1.2835
1 11/64⬙
1 7/32⬙
1 19/64⬙
1 11/32⬙
1.1719
1.2187
1.2969
1.3437
1 1/2⬙
–
12
1.5000
1.4459
1.3918
1 27/64⬙
1.4219
1 3/4⬙
2⬙
2 1/4⬙
2 1/2⬙
5
4 1/2
4 1/2
4 1/2
–
–
–
–
1.7500
2.0000
2.2500
2.5000
1.6201
1.8557
2.1057
2.3376
1.4902
1.7113
1.9613
2.1752
1 9/16⬙
1 25/32⬙
2 1/32⬙
2 1/4⬙
1.5625
1.7812
2.0313
2.2500
2 3/4⬙
4
–
2.7500
2.5876
2.4252
2 1/2⬙
2.5000
3⬙
3 1/4⬙
3 1/2⬙
3 3/4⬙
4⬙
4
4
4
4
4
–
–
–
–
–
3.0000
3.2500
3.5000
3.7500
4.0000
2.8376
3.0876
3.3376
3.5876
3.3786
2.6752
2.9252
3.1752
3.4252
3.6752
2 3/4⬙
3⬙
3 1/4⬙
3 1/2⬙
3 3/4⬙
2.7500
3.0000
3.2500
3.5000
3.7500
Outside
Diameter
Inches
Pitch
Diameter
Inches
Root
Diameter
Inches
Tap Drill
Approx. 75%
Full Thread
Decimal
Equiv. of
Tap Drill
Millimeter Tap Drill Sizes
Decimal
Equiv.
Inches
Metric
Tap
Tap
Drill
mm
Decimal
Equiv.
Inches
Metric
Tap
Decimal
Equiv.
Inches
Metric
Tap
Tap
Drill
mm
M1.6 x 0.35 1.25
.0492
M6 x 1
5.00
.1968
M16 x 2
14.00
.5512
M27 x 3
24.00
.9449
M1.8 x 0.35 1.45
.0571
M7 x 1
6.00
.2362
M16 x 1.5
14.50
.5709
M27 x 2
25.00
.9843
M2 x 0.4
1.60
.0630
M8 x 1.25
6.70
.2638
M18 x 2.5
15.50
.6102
M30 x 3.5
26.50
1.0433
M2.2 x 0.45 1.75
.0689
M8 x 1
7.00
.2756
M18 x 1.5
16.50
.6496
M30 x 2
28.00
1.1024
M2.5 x 0.45 2.05
.0807
M10 x 1.5
8.50
.3346
M20 x 2.5
17.50
.6890
M33 x 3.5
29.50
1.1614
M3 x 0.5
2.50
.0984
M10 x 1.25
8.70
.3425
M20 x 1.5
18.50
.7283
M33 x 2
31.00
1.2205
M3.5 x 0.6
2.90
.1142
M12 x 1.75
10.20
.4016
M22 x 2.5
19.50
.7677
M36 x 4
32.00
1.2598
M4 x 0.7
3.30
.1299
M12 x 1.25
10.80
.4252
M22 x 1.5
20.50
.8071
M36 x 3
33.00
1.2992
M4.5 x 0.75 3.70
.1457
M14 x 2
12.00
.4724
M24 x 3
21.00
.8268
M39 x 4
35.00
1.3780
M5 x 0.8
.1654
M14 x 1.5
12.50
.4921
M24 x 2
22.00
.8661
M39 x 3
36.00
1.4173
Metric
Tap
654
Tap
Drill
mm
4.20
Tap
Drill
mm
Decimal
Equiv.
Inches
REFERENCE TABLES
Tap Drill Sizes For Fractional Size Threads
Approximately 65% Depth Thread / AMERICAN NATIONAL THREAD FORM
Tap Size
1/16
1/16
1/16
5/64
5/64
5/64
5/64
3/32
3/32
3/32
3/32
7/64
7/64
7/64
1/8
1/8
1/8
1/8
9/64
9/64
9/64
5/32
5/32
5/32
11/64
11/64
3/16
3/16
3/16
3/16
13/64
13/64
13/64
7/32
7/32
7/32
15/64
15/64
15/64
1/4
1/4
1/4
1/4
1/4
5/16
5/16
5/16
5/16
5/16
3/8
3/8
3/8
3/8
7/16
7/16
7/16
7/16
1/2
1/2
Threads
per Inch
72
64
60
72
64
60
56
60
56
50
48
56
50
48
48
40
36
32
40
36
32
40
36
32
36
32
36
32
30
24
32
30
24
32
28
24
32
28
24
32
28
27
24
20
32
27
24
20
18
27
24
20
16
27
24
20
14
27
24
Hole Diameter
.049
.047
.046
.065
.063
.062
.061
.077
.076
.074
.073
.092
.090
.089
.105
.101
.098
.095
.116
.114
.110
.132
.129
.126
.145
.141
.161
.157
.155
.147
.173
.171
.163
.188
.184
.178
.204
.200
.194
.220
.215
.214
.209
.201
.282
.276
.272
.264
.258
.339
.334
.326
.314
.401
.397
.389
.368
.464
.460
Drill
3/64
3/64
56
52
1/16
1/16
53
5/64
48
49
49
42
43
43
36
38
40
3/32
32
33
35
30
30
1/8
27
9/64
20
22
23
26
17
11/64
20
12
13
16
6
8
10
7/32
3
3
4
7
9/32
J
I
17/64
F
R
Q
21/64
5/16
Y
X
25/64
U
15/32
29/64
Tap Size
1/2
1/2
1/2
9/16
9/16
9/16
5/8
5/8
5/8
5/8
11/16
11/16
3/4
3/4
3/4
3/4
13/16
13/16
7/8
7/8
7/8
7/8
7/8
15/16
15/16
1
1
1
1
1 1/16
1 1/8
1 1/8
1 3/16
1 1/4
1 1/4
1 5/16
1 3/8
1 3/8
1 1/2
1 1/2
1 5/8
1 3/4
1 7/8
2
2 1/8
2 1/4
2 3/8
2 1/2
2 5/8
2 3/4
2 7/8
3
3 1/8
3 1/4
3 3/8
3 1/2
3 5/8
3 3/4
4
Threads
per Inch
20
13
12
27
18
12
27
18
12
11
16
11
27
16
12
10
12
10
27
18
14
12
9
12
9
27
14
12
8
8
12
7
7
12
7
7
12
6
12
6
5 1/2
5
5
4 1/2
4 1/2
4 1/2
4
4
4
4
3 1/2
3 1/2
3 1/2
3 1/2
3 1/4
3 1/4
3 1/4
3
3
Hole Diameter
.451
.425
.419
.526
.508
.481
.589
.571
.544
.536
.627
.599
.714
.689
.669
.653
.731
.715
.839
.821
.805
.794
.767
.856
.829
.964
.930
.919
.878
.941
1.044
.986
1.048
1.169
1.111
1.173
1.294
1.213
1.419
1.338
1.448
1.555
1.680
1.783
1.909
2.034
2.131
2.256
2.381
2.506
2.597
2.722
2.847
2.972
3.075
3.200
3.325
3.425
3.675
Drill
29/64
27/64
27/64
17/32
33/64
31/64
19/32
37/64
35/64
17/32
5/8
19/32
23/32
11/16
43/64
21/32
47/64
23/32
27/32
53/64
13/16
51/64
49/64
55/64
53/64
31/32
15/16
59/64
7/8
15/16
1 3/64
63/64
1 3/64
1 11/64
1 7/64
1 11/64
1 19/64
1 7/32
1 27/64
1 11/32
1 29/64
1 9/16
1 11/16
1 25/32
1 29/32
2 1/32
2 1/8
2 1/4
2 3/8
2 1/2
2 19/32
2 23/32
2 27/32
2 31/32
3 1/16
3 3/16
3 5/16
3 7/16
3 11/16
655
REFERENCE TABLES
Double Depth of Screw Threads
Millimeter Standard
p
D.D. = 1.732 For V Thread
N
f
60º
D.D. = 1.299 For American Nat. Form, U.S. Std.
N
f
d
D.D. = 1.28 For Whitworth Standard
N
Threads
per Inch
N
656
V
Threads
D.D.
Am. Nat. Form
U.S. Standard
D.D.
Whitworth
Standard
D.D.
2
3
4
10
13
.86600
.57733
.43300
.17320
.13323
.64950
.43300
.32475
.12990
.09992
.64000
.42666
.32000
.12800
.09846
18
20
22
24
26
.09622
.08660
.07872
.07216
.06661
.07216
.06495
.05904
.05412
.04996
.07111
.06400
.05818
.05333
.04923
27
28
30
32
34
.06415
.06185
.05773
.05412
.05094
.04811
.04639
.04330
.04059
.03820
.04740
.04571
.04266
.04000
.03764
36
38
40
56
60
80
.04811
.04558
.04330
.03093
.02887
.02165
.03608
.03418
.03247
.02319
.02165
.01623
.03555
.03368
.03200
.02285
.02133
.01600
p = distance between any point on a thread to
the corresponding point on the adjacent thread
d = depth – 0.64952P
f = flat – 0.125P
ISO External Threads
Medium Fit
Designation
mm Diameter
mm Pitch
M2 x 0.4
2
0.4
M3 x 0.5
3
0.5
M4 x 0.7
4
0.7
M5 x 0.8
5
0.8
M6 x 1
6
1.0
M8 x 1.25
8
1.25
M10 x 1.5
10
1.5
M12 x 1.75
12
1.75
M16 x 2
16
2.0
M20 x 2.5
20
2.5
M24 x 3
24
3.0
M30 x 3.5
30
3.5
REFERENCE TABLES
American Standard Acme Screw Thread Dimensions
p
h = Basic depth of thread
h⬘ = Depth of thread with clearance
K = Tap drill
Basic minor diameter of nut
Fc = Width of flat at crest of thread
Fr = Width of flat at bottom of space
n
p
Kr
D
T
FOR 10 OR LESS THREADS PER INCH
h⬘ = P plus .010
2
Fr = .3707 minus .0052
n
T = D plus .020
FOR MORE THAN 10 THREADS PER INCH
h⬘ = P plus .005
2
Fr = .3707 minus .0026
n
T = D plus .010
Threads
per inch
(n)
=
=
=
=
=
Depth of Thread
with Clearance
(h⬘)
1
1 1/3
2
3
4
5
6
7
8
9
10
12
14
16
Number of threads per inch
Pitch of thread
Minor diameter of screw
Major diameter of screw
Major diameter of tap
Flat at
Top of Thread
(Fc)
.5100
.3850
.2600
.1767
.1350
.1100
.0933
.0814
.0725
.0655
.0600
.0467
.0407
.0363
.3707
.2780
.1854
.1236
.0927
.0741
.0618
.0530
.0463
.0412
.0371
.0309
.0265
.0232
Fc
29º
h⬘
Fr
p=1
n
K = D minus p
Fc = .3707
n
Kr = D minus 2h⬘
Flat at
Bottom of Space
(Fr)
Space at
Top of Thread
Thickness
at Root
of Thread
.3655
.2728
.1802
.1184
.0875
.0689
.0566
.0478
.0411
.0360
.0319
.0283
.0239
.0206
.6293
.4720
.3146
.2097
.1573
.1259
.1049
.0899
.0787
.0699
.0629
.0524
.0449
.0393
.6345
.4772
.3198
.2149
.1625
.1311
.1101
.0951
.0839
.0751
.0681
.0550
.0475
.0419
Tapers and Angles
Included Angle
Angle With Center Line
Taper
per Foot
Degree
Minute
Second
Degree
Minute
Second
Taper
per inch
Taper per inch
from Center Line
1/8⬙
1/4⬙
3/8⬙
0
1
1
35
11
47
49
37
25
0
0
0
17
35
53
54
49
43
.010417
.020833
.031250
.005208
.010417
.015625
1/2⬙
5/8⬙
3/4⬙
7/8⬙
2
2
3
4
23
59
34
10
13
1
47
33
1
1
1
2
11
29
47
5
37
30
24
17
.041667
.052083
.062500
.072917
.020833
.026042
.031250
.036458
1⬙
1 1/4⬙
1 1/2⬙
1 3/4⬙
4
5
7
8
46
57
9
20
19
47
10
27
2
2
3
4
23
58
34
10
9
53
35
14
.083333
.104167
.125000
.145833
.041667
.052084
.062500
.072917
2⬙
2 1/2⬙
3⬙
3 1/2⬙
9
11
14
16
31
53
2
35
38
37
0
39
4
5
7
8
45
56
1
17
49
49
30
50
.166667
.208333
.250000
.291667
.083333
.104167
.125000
.145833
4⬙
4 1/2⬙
5⬙
6⬙
18
21
23
28
55
14
32
4
29
22
12
21
9
10
11
14
27
37
46
2
44
11
6
10
.333333
.375000
.416667
.500000
.166667
.187500
.208333
.250000
657
REFERENCE TABLES
General Guide for Cutting Speeds and Feeds for Drills
The following information is a general guide. Specific jobs may
need to be modified because of varying job conditions, such as
coolant, equipment and job requirements.
Guide for Drill Feeds
Drill Dia.
Feed per Rev.
Drill Dia.
Feed per Rev.
Drill feeds are governed by the size of the drill and also the material
to be drilled.
Under 1/8⬙
.001⬙ - .002⬙
Under 3 mm
.025 - .05 mm
1/8⬙ - 1/4⬙
.002⬙ - .004⬙
3 - 6 mm
.05 - .100 mm
The lower feeds should be used when drilling relatively hard
materials such as alloy steels. The higher feeds should be used
when drilling relatively soft materials such as aluminum and brass.
1/4⬙ - 1/2⬙
.004⬙ - .007⬙
6 - 13 mm
.100 - .180 mm
1/2⬙ - 1⬙
.007⬙ - .015⬙
13 - 25 mm
.180 - .370 mm
These feeds are based on the peripheral speed of a drill.
Over 1⬙
.015⬙ - .025⬙
Over 25 mm
.370 - .630 mm
Guide for Peripheral Speeds
Material
Feet/Minute
Carbon Drill HSS Drill
Meters/Minute
Carbon Drill HSS Drill
Machinery
30
Steel
80
9
24
Cast Iron
35
100
10.5
30
Brass
60
200
18
60
50
–
15
Alloy Steel –
Drill Dia.
Inches mm
1/8
1/4
1/2
1
1 1/2
2
3
658
3 mm
6 mm
13 mm
25 mm
38 mm
50 mm
75 mm
30 (9 )
917
458
229
115
76
57
38
PERIPHERAL SPEEDS – FEET PER MINUTE (METERS PER MINUTE)
50 (15)
60 (18)
80 (24)
100 (30)
REVOLUTIONS PER MINUTE
1528
764
382
191
127
96
64
1833
917
458
229
153
115
76
2445
1222
611
306
204
153
102
3056
1528
764
382
255
191
127
200 (60)
6112
3056
1528
764
509
382
255
REFERENCE TABLES
Pitch Diameter Tables – American National Thread Form
For Nos. 575 and 585 Screw Thread Micrometers
Number Sizes
Fractional Sizes
Caliper Reading or Pitch Diameter = D – .6495
N
Caliper Reading or Pitch Diameter = D – .6495
N
0
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
22
24
26
28
30
Caliper
Reading
or Max.
Pitch
Diameter
Single
Depth
of
Thread
Threads
Per
Inch
D
N
D – .6495
N
.6495
N
.060
.073
.086
.099
.112
.125
.138
.151
.164
.177
.190
.216
.242
.268
.294
.320
.346
.372
.398
.424
.450
80
72
64
56
48
44
40
36
36
32
30
28
24
22
20
20
18
16
16
14
14
.0519
.0640
.0759
.0874
.0985
.1102
.1218
.1330
.1460
.1567
.1684
.1928
.2149
.2385
.2615
.2875
.3099
.3314
.3574
.3776
.4036
.0081
.0090
.0101
.0116
.0135
.0148
.0162
.0180
.0180
.0203
.0217
.0232
.0271
.0295
.0325
.0325
.0361
.0406
.0406
.0464
.0464
Diameter
Inches
D
Note: As there is no standard of diameter for the finer
pitches, this column is left blank.
No.
Basic
and
Max.
Outside
Diameter
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
1 5/8
1 3/4
1 7/8
2
2 1/2
3
3 1/2
4
Threads
per Inch
N
64
62
60
58
56
54
52
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
13
12
11
10
9
8
7
7
6
6
5 1/2
5
5
4 1/2
4
3 1/2
3 1/4
3
Caliper
Reading
of Pitch
Diameter
Single
Depth
of Thread
D – .6495
N
.6495
N
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
.2175
.2764
.3344
.3911
.4501
.5084
.5660
.6851
.8029
.9188
1.0322
1.1572
1.2668
1.3918
1.5070
1.6201
1.7451
1.8557
2.3376
2.8145
3.3002
3.7835
.0101
.0105
.0108
.0112
.0116
.0120
.0125
.0130
.0135
.0141
.0148
.0155
.0162
.0171
.0180
.0191
.0203
.0217
.0232
.0250
.0271
.0295
.0325
.0361
.0406
.0464
.0499
.0541
.0590
.0649
.0721
.0812
.0928
.0928
.1082
.1082
.1180
.1299
.1299
.1443
.1624
.1855
.1998
.2165
659
REFERENCE TABLES
Pitch Diameter Tables
For Nos. 575 and 585 Screw Thread Micrometers
p
Whitworth Standard
f
Caliper Reading or Pitch Diameter for Whitworth Threads = D – .640
N
660
d
f
Caliper
Reading
or Pitch
Diameter
Single
Depth
of Thread
Diameter
Inches
Threads
per Inch
D
N
D – .640
N
.640
N
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
12
11
11
10
10
9
9
8
7
7
6
6
5
5
4 1/2
4 1/2
4 1/2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
.2180
.2769
.3350
.3918
.4467
.5092
.5668
.6293
.6860
.7485
.8039
.8664
.9200
1.0336
1.1586
1.2684
1.3934
1.4970
1.6220
1.7328
1.8578
1.9828
.0133
.0139
.0146
.0152
.0160
.0168
.0178
.0188
.0200
.0213
.0229
.0246
.0267
.0291
.0320
.0355
.0400
.0457
.0533
.0533
.0582
.0582
.0640
.0640
.0711
.0711
.0800
.0914
.0914
.1066
.1066
.1280
.1280
.1422
.1422
.1422
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1/4
5/16
3/8
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
15/16
1
1 1/8
1 1/4
1 3/8
1 1/2
1 5/8
1 3/4
1 7/8
2
2 1/8
60º
p = pitch =
Metric
Standard
1
No. thread per inch
d = depth = p X .6495
f = flat = pitch
8
Pitch
Size
Mm
Intl. Std.
French Std.
2
3
4
5
6
7
8
9
10
11
12
14
16
18
20
22
24
26
27
28
30
32
33
34
36
38
39
40
.45
.55
.70
.85
1.00
1.00
1.25
1.25
1.50
1.50
1.75
2.00
2.00
2.50
2.50
2.50
3.00
—
3.00
—
3.50
—
3.50
—
4.00
—
4.00
—
.50
.50
.75
.75
1.00
1.00
1.00
1.00
1.50
—
1.50
2.00
2.00
2.50
2.50
2.50
3.00
3.00
—
3.00
3.50
3.50
3.50
3.50
4.00
4.00
—
4.00
REFERENCE TABLES
Pitch Diameter Table
For Nos. 575 and 585 Screw Thread Micrometers “V” Standard Thread Form
Caliper Reading or Pitch Diameter for “V” Threads = D – .866
N
Caliper Reading
Single Depth
Diameter
Threads
or Pitch Diameter
of Thread
Inches*
per Inch
Threads
per Inch
D
N
D – .866
N
.866
N
D
N
64
62
60
58
56
54
52
50
48
46
44
42
40
38
36
34
32
30
28
26
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
.0135
.0140
.0144
.0149
.0155
.0161
.0167
.0173
.0180
.0188
.0197
.0206
.0217
.0228
.0241
.0255
.0271
.0289
.0309
.0333
1/4
1/4
5/16
5/16
3/8
3/8
7/16
7/16
1/2
1/2
1/2
9/16
9/16
5/8
5/8
11/16
3/4
7/8
1
1 1/8
1 1/4
1 1/2
24
20
20
18
18
16
16
14
14
13
12
14
12
11
10
10
10
9
8
8
7
6
Note: As there is no standard of diameter for the finer
pitches, this column is left blank.
Diameter
Inches
—
—
—
—
Caliper Reading
or Pitch Diameter
Single Depth
of Thread
D – .866
N
.866
N
.2139
.2067
.2692
.2644
.3269
.3209
.3834
.3756
.4381
.4334
.4278
.5006
.4903
.5463
.5384
.6009
.6634
.7788
.8918
1.0168
1.1263
1.3557
.0361
.0433
.0433
.0481
.0481
.0541
.0541
.0619
.0619
.0666
.0722
.0619
.0722
.0787
.0866
.0866
.0866
.0962
.1082
.1082
.1237
.1443
figures give the outside diameter for screws with threads cut theoretically sharp. As it is not practical to make these threads sharp, the outside diameter will measure
* These
less than the figures given, the pitch diameter remaining the same.
American Standard Acme Screw Thread Dimensions
p
h = Basic depth of thread
h⬘ = Depth of thread with clearance
K = Tap drill
Basic minor diameter of nut
Fc = Width of flat at crest of thread
Fr = Width of flat at bottom of space
n
p
Kr
D
T
FOR 10 OR LESS THREADS PER INCH
h⬘ = p plus .010
2
Fr = .3707 minus .0052
n
T = D plus .020
FOR MORE THAN 10 THREADS PER INCH
h⬘ = p plus .005
2
Fr = .3707 minus .0026
n
T = D plus .010
=
=
=
=
=
Number of threads per inch
Pitch of thread
Minor diameter of screw
Major diameter of screw
Major diameter of tap
Fc
29º
h⬘
Fr
Threads
per inch
(n)
1
1 1/3
2
3
4
5
6
7
8
9
10
12
14
16
Depth of Thread
with Clearance
(h⬘)
.5100
.3850
.2600
.1767
.1350
.1100
.0933
.0814
.0725
.0655
.0600
.0467
.0407
.0363
Flat at
Top of Thread
(Fc)
.3707
.2780
.1854
.1236
.0927
.0741
.0618
.0530
.0463
.0412
.0371
.0309
.0265
.0232
Flat at
Bottom of Space
(Fr)
.3655
.2728
.1802
.1184
.0875
.0689
.0566
.0478
.0411
.0360
.0319
.0283
.0239
.0206
p=1
n
K = D minus p
Space at
Top of Thread
.6293
.4720
.3146
.2097
.1573
.1259
.1049
.0899
.0787
.0699
.0629
.0524
.0449
.0393
Fc = .3707
n
Kr = D minus 2h⬘
Thickness
at Root
of Thread
.6345
.4772
.3198
.2149
.1625
.1311
.1101
.0951
.0839
.0751
.0681
.0550
.0475
.0419
661
REFERENCE TABLES
Temperature Conversion
Using this table to convert Fahrenheit degrees (Fº) directly to Celsius
degrees (Cº) and vice versa. It covers the range of temperatures
used in most hardening, tempering and annealing operations.
Lower, higher and intermediate conversions can be made by
substituting a known Fahrenheit (Fº) or Celsius (Cº) temperature
figure in either of the following formulas.
Cº = Fº 9- 32 x 5
Fº = Cº 5x 9 + 32
Fº
Cº
Fº
Cº
Fº
Cº
Fº
Cº
Fº
Cº
–160
–140
–120
–100
–80
–60
–40
–107
–96
–84
–73
–62
–51
–40
–20
–0
–20
–32
–40
–60
–80
–29
–18
–7
0
4
16
27
–100
–120
–140
–160
–180
–200
–212
–38
–49
–60
–71
–82
–93
–100
220
300
400
500
600
700
800
–104
–149
–204
–260
–316
–371
–427
–1000
–1200
–1400
–1600
–1800
–2000
–2200
–538
–649
–760
–871
–982
–1093
–1204
High Temperatures Judged by Color and Colors for Tempering
Degrees
Centigrade
400
525
700
900
1100
1300
1500
Degrees
Fahrenheit
752
975
1292
1652
2012
2372
2732
High Temperatures Judged
by Color
Red heat, visible in the dark
Red heat, visible in daylight
Dark red
Cherry-red
Orange-red
Yellow-white
Brilliant white
Degrees
Centigrade
221.1
237.8
254.4
260.0
271.1
282.2
293.3
Degrees
Fahrenheit
430
460
490
500
520
540
560
Colors for Tempering
Very pale yellow
Straw-yellow
Yellow-brown
Brown-yellow
Brown-purple
Full purple
Full blue
Rules Relative to the Circle
To Find Circumference
– Multiply diameter by 3.1416
– Or divide diameter by 0.3183
To Find Diameter
– Multiply circumference by 0.3183
– Or divide circumference by 3.1416
To Find Radius
– Multiply circumference by 0.15915
– Or divide circumference by 6.28318
To Find Side of an Inscribed Square
– Multiply diameter by 0.7071
– Or multiply circumference by 0.2251
– Or divide circumference by 4.4428
To Find Side of an Equal Square
– Multiply diameter by 0.8862
– Or divide diameter by 1.1284
– Or multiply circumference by 0.2821
– Or divide circumference by 3.545
662
Square
– A side multiplied by 1.4142 equals diameter of its
circumscribing circle
– A side multiplied by 4.443 equals circumference of its
circumscribing circle
– A side multiplied by 1.128 equals diameter of an equal side
– A side multiplied by 3.547 equals circumference of an
equal circle
To Find the Area of a Circle
– Multiply circumference by one-quarter of the diameter
– Or multiply the square of diameter by 0.7854
– Or multiply the square of circumference by .07958
– Or multiply the square of 1/2 diameter by 3.1416
To Find the Surface of a Sphere or Globe
– Multiply the diameter by the circumference
– Or multiply the square of a diameter by 3.1416
– Or multiply four times the square of radius by 3.1416
REFERENCE TABLES
Standards for Sheet and Wire Gages with corresponding Starrett Gages
Dimensions of Sizes in Decimal Parts of an Inch
Starrett
Sheet and
Wire Gage
Cat. Nos.
No. 281
No. 188
No. 245
No. 287
No. 280
No.283
American S. & W.
U.S. Standard Gage
Number of
American or
Birmingham or Washburn & Moen,
Co’s. Music
for Sheet and
Wire Gage Brown & Sharpe Stubs’ Iron Wire (Worcester, MA)
Wire Gage
Stubs’ Steel Wire Plate Iron and Steel
00000000
—
—
—
—
—
—
0000000
—
—
—
—
—
—
000000
—
—
—
.004
—
.46875
00000
—
—
—
.005
—
.4375
0000
.460
.454
.3938
.006
—
.40625
000
.40964
.425
.3625
.007
—
.375
00
.3648
.380
.3310
.008
—
.34375
0
.32486
.340
.3065
.009
—
.3125
1
.2893
.300
.2830
.010
.227
.28125
2
.25763
.284
.2625
.011
.219
.265625
3
.22942
.259
.2437
.012
.212
.250
4
.20431
.238
.2253
.013
.207
.234375
5
.18194
.220
.2070
.014
.204
.21875
6
.16202
.203
.1920
.016
.201
.203125
7
.14428
.180
.1770
.018
.199
.1875
8
.12849
.165
.1620
.020
.197
.171875
9
.11443
.148
.1483
.022
.194
.15625
10
.10189
.134
.1350
.024
.191
.140625
11
.090742
.120
.1205
.026
.188
.125
12
.080808
.109
.1055
.029
.185
.109375
13
.071961
.095
.0915
.031
.182
.09375
14
.064084
.083
.0800
.033
.180
.078125
15
.057068
.072
.0720
.035
.178
.0703125
16
.05082
.065
.0625
.037
.175
.0625
17
.045257
.058
.0540
.039
.172
.05625
18
.040303
.049
.0475
.041
.168
.050
19
.03589
.042
.0410
.043
.164
.04375
20
.031961
.035
.0348
.045
.161
.0375
21
.028462
.032
.03175
.047
.157
.034375
22
.025347
.028
.0286
.049
.155
.03125
23
.022571
.025
.0258
.051
.153
.028125
24
.0201
.022
.0230
.055
.151
.025
25
.0179
.020
.0204
.059
.148
.021875
26
.01594
.018
.0181
.063
.146
.01875
27
.014195
.016
.0173
.067
.143
.0171875
28
.012641
.014
.0162
.071
.139
.015625
29
.011257
.013
.0150
.075
.134
.0140625
30
.010025
.012
.0140
.080
.127
.0125
31
.008928
.010
.0132
.085
.120
.0109375
32
.00795
.009
.0128
.090
.115
.01015625
33
.00708
.008
.0118
.095
.112
.009375
34
.006304
.007
.0104
—
.110
.00859375
35
.005614
.005
.0095
—
.108
.0078125
36
.005
.004
.0090
—
.106
.00703125
37
.004453
—
—
—
.103
.006640625
38
.003965
—
—
—
.101
.00625
39
.003531
—
—
—
.099
—
40
.003144
—
—
—
.097
—
663
REFERENCE TABLES
Triangle Chart
For the Rapid Solution of Right-Angle and Oblique-Angle Triangles
664
J.W. DONCHIN CO.
www.jwdonchin.com
Precision Measuring Equipment and Industrial Supplies since 1924.
4841 W. Chicago Ave. - Chicago, IL 60651 • Phone: 773-261-2182 • Fax: 773-261-2867 • sales@jwdonchin.com
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