|
Unified External Screw Threads
Classes 2A & 3A UNRC. UNRF. |
Nominal
Size & TPI |
Class 2A |
Class 3A |
Major
Diameter |
Pitch
Diameter |
Major
Diameter |
Pitch
Diameter |
Blank
Size |
4-40 |
.1061
.1112 |
.0925
.0950 |
.1069
.1120 |
.0939
.0958 |
.0938
.0943 |
4-48 |
.1068
.1113 |
.0954
.0978 |
.1075
.1120 |
.0967
.0985 |
.0968
.0971 |
5-40 |
.1191
.1242 |
.1054
.1080 |
.1199
.1250 |
.1060
.1088 |
.1067
.1072 |
5-44 |
.1195
.1243 |
.1070
.1095 |
.1202
.1250 |
.1083
.1102 |
.1083
.1088 |
6-32 |
.1312
.1372 |
.1141
.1169 |
.1320
.1380 |
.1156
.1177 |
.1155
.1161 |
6-40 |
.1321
.1372 |
.1184
.1210 |
.1329
.1380 |
.1198
.1218 |
.1197
.1202 |
8-32 |
.1571
.1631 |
.1399
.1428 |
.1580
.1640 |
.1415
.1437 |
.1414
.1419 |
8-36 |
.1577
.1632 |
.1424
.1452 |
.1585
.1640 |
.1439
.1460 |
.1438
.1444 |
10-24 |
.1818
.1890 |
.1586
.1619 |
.1828
.1900 |
.1604
.1629 |
.1603
.1609 |
10-32 |
.1831
.1891 |
.1658
.1688 |
.1840
.1900 |
.1674
.1697 |
.1673
.1679 |
12-24 |
.2078
.2150 |
.1845
.1879 |
.2088
.2160 |
.1863
.1889 |
.1862
.1867 |
12-28 |
.2085
.2150 |
.1888
.1918 |
.2095
.2160 |
.1904
.1928 |
.1903
.1908 |
1/4-20 |
.2408
.2489 |
.2127
.2164 |
.2419
.2500 |
.2147
.2175 |
.2146
.2153 |
1/4-28 |
.2425
.2490 |
.2225
.2258 |
.2435
.2500 |
.2243
.2268 |
.2242
.2248 |
5/16-18 |
.3026
.3113 |
.2712
.2752 |
.3038
.3125 |
.2734
.2764 |
.2732
.2740 |
5/16-24 |
.3042
.3114 |
.2806
.2843 |
.3053
.3125 |
.2827
.2854 |
.2825
.2832 |
3/8-16 |
.3643
.3737 |
.3287
.3331 |
.3656
.3750 |
.3311
.3344 |
.3309
.3318 |
3/8-24 |
.3667
.3739 |
.3430
.3468 |
.3678
.3750 |
.3450
.3479 |
.3449
.3457 |
7/16-14 |
.4258
.4361 |
.3850
.3897 |
.4272
.4375 |
.3876
.3911 |
.3874
.3883 |
7/16-20 |
.4281
.4362 |
.3995
.4037 |
.4294
.4375 |
.4019
.4050 |
.4016
.4024 |
1/2-13 |
.4876
.4985 |
.4435
.4485 |
.4891
.5000 |
.4463
.4500 |
.4480
.4470 |
1/2-20 |
.4906
.4987 |
.4619
.4662 |
.4919
.5000 |
.4643
.4675 |
.4641
.4649 |
9/16-12 |
.5016
.5068 |
.5495
.5609 |
.5045
.5084 |
.5511
.5625 |
.5050
.5070 |
9/16-18 |
.5205
.5250 |
.5524
.5611 |
.523
.5264 |
.5538
.5625 |
.5170
.5190 |
5/8-11 |
.5589
.5644 |
.6113
.6234 |
.5619
.5660 |
.6129
.6250 |
.5630
.5650 |
5/8-18 |
.5828
.5875 |
.6149
.6236 |
.5854
.5889 |
.6163
.6250 |
.5840
.5860 |
ISO Metric Threads —CLASS 6g |
Metric Size |
Inch Measurement |
Millimeters |
Nominal Size |
Major Diameter |
Pitch Diameter |
Blank Size |
Major Diameter |
Pitch Diameter |
Blank
Size |
M3 x .5 |
.1173
.1131 |
.1045
.1016 |
.1037
.1030 |
2.980
2.874 |
2.655
2.580 |
2.635
2.615 |
M3.5 x .6 |
.1370
.1320 |
.1216
.1183 |
.1205
.1195 |
3.479
3.354 |
3.089
3.004 |
3.060
3.035 |
M4 x .7 |
.1566
.1511 |
.1387
.1352 |
.1376
.1364 |
3.978
3.938 |
3.523
3.438 |
3.495
3.465 |
M5 x .8 |
.1959
.1900 |
.1754
.1717 |
.1742
.1730 |
4.976
4.826 |
4.456
4.361 |
4.425
4.395 |
M6 x 1.0 |
.2352
.2281 |
.2096
.2052 |
.2087
.2071 |
5.974
5.794 |
5.324
5.212 |
5.300
5.260 |
M7 x 1.0 |
.2746
.2675 |
.2490
.2446 |
.2480
.2465 |
6.974
6.794 |
6.324
6.212 |
6.300
6.260 |
M8 x 1.25 |
.3139
.3055 |
.2819
.2772 |
.2807
.2791 |
7.972
7.760 |
7.160
7.042 |
7.130
7.090 |
M10 x 1.25 |
.3926
.3856 |
.3606
.3560 |
.3594
.3579 |
9.972
9.794 |
9.160
9.042 |
9.130
9.090 |
M10 x 1.5 |
.3924
.3831 |
.3541
.3489 |
.3528
.3512 |
9.968
9.732 |
8.994
8.862 |
8.960
8.920 |
M11 x 1.5 |
.4318
.4225 |
.3935
.3883 |
.3921
.3902 |
10.968
10.732 |
9.994
9.862 |
9.960
9.910 |
M12 x 1.25 |
.4713
.4630 |
.4394
.4342 |
.4382
.4366 |
11.972
11.760 |
11.160
11.028 |
11.130
11.090 |
M12 x 1.75 |
.4711
.4607 |
.4263
.4204 |
.4252
.4232 |
11.966
11.701 |
10.829
10.679 |
10.800
10.750 |
| ISO Metric Threads —CLASS 4h |
Metric Size |
Inch Measurement |
Millimeters |
Nominal Size |
Major Diameter |
Pitch Diameter |
Blank Size |
Major Diameter |
Pitch Diameter |
Blank
Size |
M3 x .5 |
.1181
.1155 |
.1053
.1034 |
.1051
.1046 |
3.000
2.933 |
2.675
2.627 |
2.669
2.656 |
M3.5 x .6 |
.1378
.1321 |
.1216
.1183 |
.1212
.1205 |
3.500
3.355 |
3.088
3.004 |
3.078
3.060 |
M4 x .7 |
.1575
.1539 |
.1396
.1374 |
.1394
.1387 |
4.000
3.910 |
3.545
3.489 |
3.540
3.522 |
M5 x .8 |
.1968
.1931 |
.1751
.1740 |
.1748
.1741 |
5.000
4.905 |
4.480
4.420 |
4.439
4.422 |
M6 x 1.0 |
.2362
.2318 |
.2106
.2078 |
.2100
.2093 |
6.000
5.888 |
5.350
5.279 |
5.334
5.316 |
M7 x 1.0 |
.2756
.2712 |
.2500
.2472 |
.2494
.2487 |
7.000
6.888 |
6.350
6.279 |
6.334
6.316 |
M8 x 1.25 |
.3150
.3098 |
.2830
.2800 |
.2826
.2819 |
8.000
7.868 |
7.188
7.113 |
7.178
7.160 |
M10 x 1.0 |
.3937
.3893 |
.3681
.3653 |
.3675
.3668 |
10.000
9.888 |
9.350
9.279 |
9.334
8.554 |
M10 x 1.25 |
.3937
.3885 |
.3617
.3588 |
.3610
.3603 |
10.000
9.868 |
9.188
9.113 |
9.169
9.151 |
M10 x 1.5 |
.3937
.3878 |
.3553
.3520 |
.3551
.3544 |
10.000
9.850 |
9.026
8.941 |
9.020
9.001 |
M12 x 1.25 |
.4724
.4672 |
.4405
.4371 |
.4397
.4390 |
12.000
11.868 |
11.188
11.103 |
11.168
11.150 |
M12 x 1.5 |
.4724
.4665 |
.4341
.4305 |
.4335
.4328 |
12.000
11.850 |
11.026
10.936 |
11.010
10.993 |
M12 x 1.75 |
.4724
.4657 |
.4277
.4239 |
.4273
.4265 |
12.000
11.830 |
10.863
10.768 |
10.853
10.833 |
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