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Nominal Size &Threads/lnch & Series DesignationAllowanceMajor DiameterPitch DiameterMaxMinMaxMinTolerance0-80
1-64
1-72
2-56
2-64UNF
UNC
UNF
UNG
UNF0.0005
0.0006
0.0006
0.0006
0.00060.0595
0.0724
0.0724
0.0854
0.08540.0563
0.0686
0.0689
0.0813
0.08160.0514
0.0623
0.0634
0.0738
0.07530.0496
0.0603
0.0615
0.0717
0.07330.0018
0.0020
0.0019
0.0021
0.00203-48
3-56
4-40
4-48
5-40UNG
UNF
UNG
UNF
UNC0.0007
0.0007
0.0008
0.0007
0.00080.0938
0.0983
0.1112
0.1113
0.12420.0938
0.0942
0.1061
0.1068
0.11910.0848
0.0867
0.0950
0.0978
0.10800.0825
0.0845
0.0925
0.0954
0.10540.0023
0.0022
0.0025
0.0024
0.00265-44
6-32
6-40
8-32
8-36UNF
UNG
UNF
UNG
UNF0.0007
0.0008
0.0008
0.0009
0.00080.1243
0.1372
0.1372
0.1631
0.16320.1195
0.1312
0.1321
0.1571
0.15770.1095
0.1169
0.1210
0.1428
0.14520.1070
0.1141
0.1184
0.1399
0.14240.0025
0.0028
0.0026
0.0029
0.002810-24
10-32
12-24
12-28
1/4-20UNG
UNF
UNG
UNF
UNG0.0010
0.0009
0.0010
0.0010
0.00110.1890
0.1891
0.2150
0.2150
0.24890.1818
0.1831
0.2078
0.2085
0.24080.1619
0.1688
0.1879
0.1918
0.21640.1586
0.1658
0.1845
0.1886
0.21270.0033
0.0030
0.0034
0.0032
0.00371/4-28
5/16-18
5/16-24
3/8-16
3/8-24UNF
UNG
UNF
UNG
UNF0.0010
0.0012
0.0011
0.0013
0.00110.2490
0.3113
0.3114
0.3737
0.37390.2425
0.3026
0.3042
0.3643
0.36670.2258
0.2752
0.2843
0.3331
0.34680.2225
0.2712
0.2806
0.3287
0.34300.0033
0.0040
0.0037
0.0044
0.00387/16-14
7/16-20
1/2-13
1/2-20
9/16-12UNG
UNF
UNG
UNF
UNG0.0014
0.0013
0.0015
0.0013
0.00160.4361
0.4362
0.4985
0.4987
0.56090.4258
0.4281
0.4876
0.4906
0.54950.3897
0.4037
0.4485
0.4662
0.50680.3850
0.3995
0.4435
0.4619
0.50160.0047
0.0042
0.0050
0.0043
0.00529/16-18
5/8-11
5/8-18
3/4-10
3/4-16UNF
UNG
UNF
UNG
UNF0.0014
0.0016
0.0014
0.0018
0.00150.5611
0.6234
0.6236
0.7482
0.74850.5524
0.6113
0.6149
0.7353
0.73910.5250
0.5644
0.5875
0.6832
0.70790.5205
0.5589
0.5828
0.6773
0.70290.0045
0.0055
0.0047
0.0059
0.00507/8-9
7/8-14
1-8
1-12
1-14UNG
UNF
UNG
UNF
UNS0.0019
0.0016
0.0020
0.0018
0.00170.8731
0.0834
0.9980
0.9982
0.99830.8592
0.8631
0.9830
0.9868
0.98800.8009
0.8270
0.9168
0.9441
0.95190.7946
0.8216
0.9100
0.9382
0.94630.0063
0.0054
0.0068
0.0059
0.005611/8-7
11/8-8
11/8-12
11/4-7
1114-8UNG
UN
UNF
UNG
UN0.0022
0.0021
0.0018
0.022
0.00211.1228
1.1229
1.1232
1.2478
1.24791.1064
1.1079
1.1118
1.2314
1.23291.0300
1.0417
1.0691
1.1550
1.16671.0228
1.0348
1.0631
1.1476
1.15970.0072
0.0069
0.0060
0.0074
0.007011/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6UNF
UNC
UN
UNF
UNC0.0018
0.0024
0.0022
0.0019
0.00241.2482
1.3726
1.3728
1.3731
1.49761.2368
1.3544
1.3578
1.3617
1.47941.1941
1.2643
1.2916
1.3190
1.38931.1879
1.2563
1.2844
1.3127
1.38120.0062
0.0080
0.0072
0.0063
0.00811 1/2-8
1 1/2-12
1 5/8-8
1 3/4-5
1 3/4-8UN
UNC
UN
UNC
UN0.0022
0.0019
0.0022
0.0027
0.00231.4978
1.4981
1.6228
1.7473
1.74771.4828
1.4867
1.6087
1.7268
1.73271.4166
1.4440
1.5416
1.6174
1.66651.4093
1.4376
1.5342
1.6085
1.65900.0073
0.0064
0.0074
0.0089
0.00751 7/8-8
2-4 1/2
2-8
2 1/4-4.5
2 1/4-8UN
UNC
UN
UNC
UN0.0023
0.0029
0.0023
0.0029
0.00241.8727
1.9971
1.9977
2.2471
2.24761.8577
1.9751
1.9827
2.2251
2.23261.7915
1.8528
1.9165
2.1028
2.16641.7838
1.8433
1.9087
2.0931
2.15840.0077
0.0095
0.0078
0.0097
0.00802 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4UNC
UN
UNC
UN
UNC0.0031
0.0024
0.0032
0.0025
0.00322.4969
2.4976
2.7468
2.7475
2.99682.4731
2.4826
2.7230
2.7325
2.97302.3345
2.4164
2.5844
2.6663
2.83442.3241
2.4082
2.5739
2.6580
2.82370.0104
0.0082
0.0105
0.0083
0.01073-8
3 1/4-4
3 1/4-8
3 1/2-4
3 1/2-8UN
UNC
UN
UNC
UN0.0026
0.0033
0.0026
0.0033
0.00262.9974
3.2467
3.2474
3.4967
3.49742.9824
3.2229
3.2324
3.4729
3.48242.9162
3.0843
3.1662
3.3343
3.41622.9077
3.0734
3.1575
3.3233
3.40740.0085
0.0109
0.0087
0.0110
0.00883 3/4-4
3 3/4-8
4-4
4-8UNC
UN
UNC
UN0.0034
0.0027
0.0034
0.00273.7466
3.7473
3.9966
3.99733.7228
3.7323
3.9728
3.98233.5842
3.6661
3.8342
3.91613.5730
3.6571
3.8229
3.90700.0112
0.0090
0.0113
0.0091