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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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