Nominal Size -
Threads/lnch/
Series Designation |
Allowance |
Major Diameter |
Pitch Diameter |
| Max |
Min |
Max |
Min |
Tolerance |
0-80
1-64
1-72
2-56
2-64 |
UNF
UNC
UNF
UNC
UNF |
0.0005
0.0006
0.0006
0.0006
0.0006 |
0.0595
0.0724
0.0724
0.0854
0.0854 |
0.0563
0.0686
0.0689
0.0813
0.0816 |
0.0514
0.0623
0.0634
0.0738
0.0753 |
0.0496
0.0603
0.0615
0.0717
0.0733 |
0.0018
0.0020
0.0019
0.0021
0.0020 |
3-48
3-56
4-40
4-48
5-40 |
UNC
UNF
UNC
UNF
UNC |
0.0007
0.0007
0.0008
0.0007
0.0008 |
0.0938
0.0983
0.1112
0.1113
0.1242 |
0.0938
0.0942
0.1061
0.1068
0.1191 |
0.0848
0.0867
0.0950
0.0978
0.1080 |
0.0825
0.0845
0.0925
0.0954
0.1054 |
0.0023
0.0022
0.0025
0.0024
0.0026 |
5-44
6-32
6-40
8-32
8-36 |
UNF
UNC
UNF
UNC
UNF |
0.0007
0.0008
0.0008
0.0009
0.0008 |
0.1243
0.1372
0.1372
0.1631
0.1632 |
0.1195
0.1312
0.1321
0.1571
0.1577 |
0.1095
0.1169
0.1210
0.1428
0.1452 |
0.1070
0.1141
0.1184
0.1399
0.1424 |
0.0025
0.0028
0.0026
0.0029
0.0028 |
10-24
10-32
12-24
12-28
1/4-20 |
UNC
UNF
UNC
UNF
UNC |
0.0010
0.0009
0.0010
0.0010
0.0011 |
0.1890
0.1891
0.2150
0.2150
0.2489 |
0.1818
0.1831
0.2078
0.2085
0.2408 |
0.1619
0.1688
0.1879
0.1918
0.2164 |
0.1586
0.1658
0.1845
0.1886
0.2127 |
0.0033
0.0030
0.0034
0.0032
0.0037 |
1/4-28
5/16-18
5/16-24
3/8-16
3/8-24 |
UNF
UNC
UNF
UNC
UNF |
0.0010
0.0012
0.0011
0.0013
0.0011 |
0.2490
0.3113
0.3114
0.3737
0.3739 |
0.2425
0.3026
0.3042
0.3643
0.3667 |
0.2258
0.2752
0.2843
0.3331
0.3468 |
0.2225
0.2712
0.2806
0.3287
0.3430 |
0.0033
0.0040
0.0037
0.0044
0.0038 |
7/16-14
7/16-20
1/2-13
1/2-20
9/16-12 |
UNC
UNF
UNC
UNF
UNC |
0.0014
0.0013
0.0015
0.0013
0.0016 |
0.4361
0.4362
0.4985
0.4987
0.5609 |
0.4258
0.4281
0.4876
0.4906
0.5495 |
0.3897
0.4037
0.4485
0.4662
0.5068 |
0.3850
0.3995
0.4435
0.4619
0.5016 |
0.0047
0.0042
0.0050
0.0043
0.0052 |
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16 |
UNF
UNC
UNF
UNC
UNF |
0.0014
0.0016
0.0014
0.0018
0.0015 |
0.5611
0.6234
0.6236
0.7482
0.7485 |
0.5524
0.6113
0.6149
0.7353
0.7391 |
0.5250
0.5644
0.5875
0.6832
0.7079 |
0.5205
0.5589
0.5828
0.6773
0.7029 |
0.0045
0.0055
0.0047
0.0059
0.0050 |
7/8-9
7/8-14
1-8
1-12
1-14 |
UNC
UNF
UNC
UNF
UNS |
0.0019
0.0016
0.0020
0.0018
0.0017 |
0.8731
0.0834
0.9980
0.9982
0.9983 |
0.8592
0.8631
0.9830
0.9868
0.9880 |
0.8009
0.8270
0.9168
0.9441
0.9519 |
0.7946
0.8216
0.9100
0.9382
0.9463 |
0.0063
0.0054
0.0068
0.0059
0.0056 |
11/8-7
11/8-8
11/8-12
11/4-7
1114-8 |
UNC
UN
UNF
UNC
UN |
0.0022
0.0021
0.0018
0.022
0.0021 |
1.1228
1.1229
1.1232
1.2478
1.2479 |
1.1064
1.1079
1.1118
1.2314
1.2329 |
1.0300
1.0417
1.0691
1.1550
1.1667 |
1.0228
1.0348
1.0631
1.1476
1.1597 |
0.0072
0.0069
0.0060
0.0074
0.0070 |
11/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6 |
UNF
UNC
UN
UNF
UNC |
0.0018
0.0024
0.0022
0.0019
0.0024 |
1.2482
1.3726
1.3728
1.3731
1.4976 |
1.2368
1.3544
1.3578
1.3617
1.4794 |
1.1941
1.2643
1.2916
1.3190
1.3893 |
1.1879
1.2563
1.2844
1.3127
1.3812 |
0.0062
0.0080
0.0072
0.0063
0.0081 |
1 1/2-8
1 1/2-12
1 5/8-8
1 3/4-5
1 3/4-8 |
UN
UNC
UN
UNC
UN |
0.0022
0.0019
0.0022
0.0027
0.0023 |
1.4978
1.4981
1.6228
1.7473
1.7477 |
1.4828
1.4867
1.6087
1.7268
1.7327 |
1.4166
1.4440
1.5416
1.6174
1.6665 |
1.4093
1.4376
1.5342
1.6085
1.6590 |
0.0073
0.0064
0.0074
0.0089
0.0075 |
1 7/8-8
2-4 1/2
2-8
2 1/4-4.5
2 1/4-8 |
UN
UNC
UN
UNC
UN |
0.0023
0.0029
0.0023
0.0029
0.0024 |
1.8727
1.9971
1.9977
2.2471
2.2476 |
1.8577
1.9751
1.9827
2.2251
2.2326 |
1.7915
1.8528
1.9165
2.1028
2.1664 |
1.7838
1.8433
1.9087
2.0931
2.1584 |
0.0077
0.0095
0.0078
0.0097
0.0080 |
2 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4 |
UNC
UN
UNC
UN
UNC |
0.0031
0.0024
0.0032
0.0025
0.0032 |
2.4969
2.4976
2.7468
2.7475
2.9968 |
2.4731
2.4826
2.7230
2.7325
2.9730 |
2.3345
2.4164
2.5844
2.6663
2.8344 |
2.3241
2.4082
2.5739
2.6580
2.8237 |
0.0104
0.0082
0.0105
0.0083
0.0107 |
3-8
3 1/4-4
3 1/4-8
3 1/2-4
3 1/2-8 |
UN
UNC
UN
UNC
UN |
0.0026
0.0033
0.0026
0.0033
0.0026 |
2.9974
3.2467
3.2474
3.4967
3.4974 |
2.9824
3.2229
3.2324
3.4729
3.4824 |
2.9162
3.0843
3.1662
3.3343
3.4162 |
2.9077
3.0734
3.1575
3.3233
3.4074 |
0.0085
0.0109
0.0087
0.0110
0.0088 |
3 3/4-4
3 3/4-8
4-4
4-8 |
UNC
UN
UNC
UN |
0.0034
0.0027
0.0034
0.0027 |
3.7466
3.7473
3.9966
3.9973 |
3.7228
3.7323
3.9728
3.9823 |
3.5842
3.6661
3.8342
3.9161 |
3.5730
3.6571
3.8229
3.9070 |
0.0112
0.0090
0.0113
0.0091 |