|
NOMINAL SIZE
THREADS/INCH
SERIES |
ALLOW-ANCE |
MAJOR
DIAMETER |
PITCH
DIAMETER |
MINOR
DIAMETER |
PITCH
DIAMETER |
MAJOR
DIA. |
|
MAX. |
MIN. |
MAX. |
MIN. |
TOLER. |
MIN. |
MAX. |
MIN. |
MAX. |
TOLER. |
MIN. |
|
0-80
1-64
1-72
2-56
2-64 |
UNF
UNC
UNF
UNC
UNF |
.0005
.0006
.0006
.0006
.0006 |
.0595
.0724
.0724
.0854
.0854 |
.0563
.0686
.0689
.0813
.0816 |
.0514
.0623
.0634
.0738
.0753 |
.0496
.0603
.0615
.0717
.0733 |
.0018
.0020
.0019
.0021
.0020 |
.0465
.0561
.0580
.0667
.0691 |
.0514
.0623
.0635
.0737
.0753 |
.0519
.0629
.0640
.0744
.0759 |
.0542
.0655
.0665
.0772
.0786 |
.0023
.0026
.0025
.0028
.0027 |
.0600
.0730
.0730
.0860
.0860 |
|
3-48
3-56
4-40
4-48 |
UNC
UNF
UNC
UNF |
.0007
.0007
.0008
.0007 |
.0983
.0983
.1112
.1112 |
.0938
.0942
.1061
.1068 |
.0848
.0867
.0950
.0978 |
.0825
.0845
.0925
.0954 |
.0023
.0022
.0025
.0024 |
.0764
.0797
.0849
.0894 |
.0845
.0865
.0939
.0968 |
.0855
.0874
.0958
.0985 |
.0885
.0902
.0991
.1016 |
.0030
.0028
.0033
.0031 |
.0990
.0990
.1120
.1120 |
|
5-40
5-44
6-32
6-40 |
UNC
UNF
UNC
UNF |
.0008
.0007
.0008
.0008 |
.1242
.1243
.1372
.1372 |
.1191
.1195
.1312
.1321 |
.1080
.1095
.1169
.1210 |
.1054
.1070
.1141
.1184 |
.0026
.0025
.0028
.0026 |
.0979
.1004
.1040
.1110 |
.1062
.1079
.1140
.1190 |
.1088
.1102
.1177
.1218 |
.1121
.1134
.1214
.1252 |
.0033
.0032
.0037
.0034 |
.1250
.1250
.1380
.1380 |
|
8-32
8-36
10-24
10-32 |
UNC
UNF
UNC
UNF |
.0009
.0008
.0010
.0009 |
.1631
.1632
.1890
.1891 |
.1571
.1577
.1818
.1831 |
.1428
.1452
.1619
.1688 |
.1399
.1424
.1586
.1658 |
.0029
.0028
.0033
.0030 |
.1300
.1340
.1450
.1560 |
.1390
.1420
.1560
.1640 |
.1437
.1460
.1629
.1697 |
.1475
.1496
.1672
.1736 |
.0038
.0036
.0043
.0039 |
.1640
.1640
.1900
.1900 |
|
12-24
12-28
1/4-20
1/4-28 |
UNC
UNF
UNC
UNF |
.0010
.0010
.0011
.0010 |
.2150
.2150
.2489
.2490 |
.2078
.2085
.2408
.2425 |
.1879
.1918
.2164
.2258 |
.1845
.1886
.2127
.2225 |
.0034
.0032
.0037
.0033 |
.1710
.1770
.1960
.2110 |
.1810
.1860
.2070
.2200 |
.1889
.1928
.2175
.2268 |
.1933
.1970
.2224
.2311 |
.0044
.0042
.0049
.0043 |
.2160
.2160
.2500
.2500 |
|
5/16-18
5/16-24
3/8-16
3/8-24 |
UNC
UNF
UNC
UNF |
.0012
.0011
.0013
.0011 |
.3113
.3114
.3737
.3739 |
.3026
.3042
.3643
.3667 |
.2752
.2843
.3331
.3468 |
.2712
.2806
.3287
.3430 |
.0040
.0037
.0044
.0038 |
.2520
.2670
.3070
.3300 |
.2650
.2770
.3210
.3400 |
.2764
.2854
.3344
.3479 |
.2817
.2902
.3401
.3528 |
.0053
.0048
.0057
.0049 |
.3125
.3125
.3750
.3750 |
|
7/16-14
7/16-20
1/2-13
1/2-20 |
UNC
UNF
UNC
UNF |
.0014
.0013
.0015
.0013 |
.4361
.4362
.4985
.4987 |
.4258
.4281
.4876
.4906 |
.3897
.4037
.4485
.4662 |
.3850
.3995
.4435
.4619 |
.0047
.0042
.0050
.0043 |
.3600
.3830
.4170
.4460 |
.3760
.3950
.4340
.4570 |
.3911
.4050
.4500
.4675 |
.3972
.4104
.4565
.4731 |
.0061
.0054
.0065
.0056 |
.4375
.4375
.5000
.5000 |
|
9/16-12
9/16-18
5/8-11
5/8-18 |
UNC
UNF
UNC
UNF |
.0016
.0014
.0016
.0014 |
.5609
.5611
.6234
.6236 |
.5495
.5524
.6113
.6149 |
.5068
.5250
.5644
.5875 |
.5016
.5205
.5589
.5828 |
.0052
.0045
.0055
.0047 |
.4720
.5020
.5270
.5650 |
.4900
.5150
.5460
.5780 |
.5084
.5264
.5660
.5889 |
.5152
.5323
.5732
.5949 |
.0068
.0059
.0072
.0060 |
.5625
.5625
.6250
.6250 |
|
3/4-10
3/4-16
7/8-9
7/8-14 |
UNC
UNF
UNC
UNF |
.0018
.0015
.0019
.0016 |
.7482
.7485
.8731
.8734 |
.7353
.7391
.8592
.8631 |
.6832
.7079
.8009
.8270 |
.6773
.7029
.7946
.8216 |
.0059
.0050
.0063
.0054 |
.6420
.6820
.7550
.7980 |
.6630
.6960
.7780
.8140 |
.6850
.7094
.8028
.8286 |
.6927
.7159
.8110
.8356 |
.0077
.0065
.0082
.0070 |
.7500
.7500
.8750
.8750 |
|
1-8
1-12
1-14 |
UNC
UNF
UNS |
.0020
.0018
.0017 |
.9980
.9982
.9983 |
.9830
.9868
.9880 |
.9168
.9441
.9519 |
.9100
.9382
.9463 |
.0068
.0059
.0056 |
.8650
.9100
.9230 |
.8900
.9280
.9380 |
.9188
.9459
.9536 |
.9276
.9535
.9609 |
.0088
.0076
.0073 |
1.0000
1.0000
1.0000 |
|
1-1/8-7
1-1/8-8
1-1/8-12 |
UNC
UN
UNF |
.0022
.0021
.0018 |
1.1228
1.1229
1.1232 |
1.1064
1.1079
1.1118 |
1.0300
1.0417
1.0691 |
1.0228
1.0348
1.0631 |
.0072
.0069
.0060 |
.9700
.9900
1.0350 |
.9980
1.0150
1.0530 |
1.0322
1.0438
1.0709 |
1.0416
1.0528
1.0787 |
.0094
.0090
.0078 |
1.1250
1.1250
1.1250 |
|
1-1/4-7
1-1/4-8
1-1/4-12 |
UNC
UN
UNF |
.0022
.0021
.0018 |
1.2478
1.2479
1.2482 |
1.2314
1.2329
1.2368 |
1.1550
1.1667
1.1941 |
1.1476
1.1597
1.1879 |
.0074
.0070
.0062 |
1.0950
1.1150
1.1600 |
1.1230
1.1400
1.1780 |
1.1572
1.1688
1.1959 |
1.6680
1.1780
1.2039 |
.0096
.0092
.0080 |
1.2500
1.2500
1.2500 |
|
1-3/8-6
1-3/8-8
1-3/8-12 |
UNC
UN
UNF |
.0024
.0022
.0019 |
1.3726
1.3728
1.3731 |
1.3544
1.3578
1.3617 |
1.2643
1.2916
1.3190 |
1.2563
1.2844
1.3127 |
.0080
.0072
.0063 |
1.1950
1.2400
1.2850 |
1.2250
1.2650
1.3030 |
1.2667
1.2938
1.3209 |
1.2771
1.3031
1.3291 |
.0104
.0093
.0082 |
1.3750
1.3750
1.3750 |
|
1-1/2-6
1-1/2-8
1-1/2-12 |
UNC
UN
UNF |
.0024
.0022
.0019 |
1.4976
1.4978
1.4981 |
1.4794
1.4828
1.4867 |
1.3893
1.4166
1.4440 |
1.3812
1.4093
1.4376 |
.0081
.0073
.0064 |
1.3200
1.3650
1.4100 |
1.3500
1.3900
1.4280 |
1.3917
1.4188
1.4459 |
1.4022
1.4283
1.4542 |
.0105
.0095
.0083 |
1.5000
1.5000
1.5000 |
|
1-5/8-8
1-3/4-5
1-3/4-8
1-7/8-8 |
UN
UNC
UN
UN |
.0022
.0027
.0023
.0023 |
1.6228
1.7473
1.7477
1.8727 |
1.6078
1.7268
1.7327
1.8577 |
1.5416
1.6174
1.6665
1.7915 |
1.5342
1.6085
1.6590
1.7838 |
.0074
.0089
.0075
.0077 |
1.4900
1.5340
1.6150
1.7400 |
1.5150
1.5680
1.6400
1.7650 |
1.5438
1.6201
1.6688
1.7938 |
1.5535
1.6317
1.6786
1.8038 |
.0097
.0116
.0098
.0100 |
1.6250
1.7500
1.7500
1.8750 |
|
2-4.5
2-8
2-1/4-4.5
2-1/4-8 |
UNC
UN
UNC
UN |
.0029
.0023
.0029
.0024 |
1.9971
1.9977
2.2471
2.2476 |
1.9751
1.9827
2.2251
2.2326 |
1.8528
1.9165
2.1028
2.1664 |
1.8433
1.9087
2.0931
2.1584 |
.0095
.0078
.0097
.0080 |
1.7590
1.8650
2.0090
2.1150 |
1.7950
1.8900
2.0450
2.1400 |
1.8557
1.9188
2.1057
2.1688 |
1.8681
1.9289
2.1183
2.1792 |
.0124
.0101
.0126
.0104 |
2.0000
2.0000
2.2500
2.2500 |
|
2-1/2-4
2-1/2-8
2-3/4-4
2-3/4-8 |
UNC
UN
UNC
UN |
.0031
.0024
.0032
.0025 |
2.4969
2.4976
2.7468
2.7475 |
2.4731
2.4826
2.7230
2.7325 |
2.3345
2.4164
2.5844
2.6663 |
2.3241
2.4082
2.5739
2.6580 |
.0104
.0082
.0105
.0083 |
2.2290
2.3650
2.4790
3.6150 |
2.2670
2.3900
2.5170
2.6400 |
2.3376
2.4188
2.5876
2.6688 |
2.3511
2.4294
2.6013
2.6796 |
.0135
.0106
.0137
.0108 |
2.5000
2.5000
2.7500
2.7500 |
|
3-4
3-8 |
UNC
UN |
.0032
.0026 |
2.9968
2.9974 |
2.9730
2.9824 |
2.8344
2.9162 |
2.8237
2.9077 |
.0107
.0085 |
2.7290
2.8650 |
2.7670
2.8900 |
2.8376
2.9188 |
2.8515
2.9299 |
.0139
.0111 |
3.0000
3.0000 |
