| Size | Threads Per Inch |
Basic Minor Diam. |
Minor Diameter of Tapped Holes Leaving Thread Engagement of: |
||||
|---|---|---|---|---|---|---|---|
| *83-1/3% | 75% | 70% | 65% | 60% | |||
| 0 | 80 | .0438 | .0465 | .0479 | .0486 | .0494 | .0502 |
| 1 | 56 | .0498 | .0537 | .0556 | .0568 | .0580 | .0591 |
| 1 | 64 | .0527 | .0561 | .0578 | .0588 | .0599 | .0609 |
| 1 | 72 | .0550 | .0580 | .0595 | .0604 | .0613 | .0622 |
| 2 | 56 | .0628 | .0667 | .0686 | .0698 | .0710 | .0721 |
| 2 | 64 | .0657 | .0691 | .0708 | .0718 | .0729 | .0739 |
| 3 | 48 | .0719 | .0765 | .0788 | .0801 | .0815 | .0828 |
| 3 | 56 | .0758 | .0797 | .0816 | .0828 | .0840 | .0851 |
| 4 | 36 | .0759 | .0820 | .0850 | .0868 | .0886 | .0904 |
| 4 | 40 | .0795 | .0850 | .0877 | .0893 | .0909 | .0926 |
| 4 | 48 | .0849 | .0895 | .0918 | .0931 | .0945 | .0958 |
| 5 | 40 | .0925 | .0980 | .1007 | .1023 | .1039 | .1056 |
| 5 | 44 | .0955 | .1005 | .1029 | .1044 | .1059 | .1073 |
| 6 | 32 | .0974 | .1042 | .1076 | .1096 | .1117 | .1137 |
| 6 | 40 | .1055 | .1110 | .1137 | .1153 | .1169 | .1185 |
| 8 | 32 | .1234 | .1302 | .1336 | .1356 | .1377 | .1397 |
| 8 | 36 | .1279 | .1340 | .1370 | .1388 | .1406 | .1424 |
| 10 | 24 | .1359 | .1450 | .1495 | .1522 | .1549 | .1576 |
| 10 | 32 | .1494 | .1562 | .1596 | .1616 | .1637 | .1657 |
| 12 | 24 | .1619 | .1710 | .1755 | .1782 | .1809 | .1836 |
| 12 | 28 | .1696 | .1774 | .1813 | .1836 | .1859 | .1882 |
| 14 | 20 | .1770 | .1879 | .1933 | .1966 | .1998 | .2031 |
| 14 | 24 | .1879 | .1970 | .2015 | .2042 | .2069 | .2096 |
| 1/4 | 20 | .1850 | .1959 | .2012 | .2046 | .2078 | .2111 |
| 1/4 | 28 | .2036 | .2114 | .2153 | .2176 | .2199 | .2222 |
| 5/16 | 18 | .2403 | .2524 | .2584 | .2620 | .2656 | .2692 |
| 5/16 | 24 | .2584 | .2675 | .2720 | .2747 | .2774 | .2801 |
| 3/8 | 16 | .2938 | .3074 | .3142 | .3182 | .3223 | .3263 |
| 3/8 | 24 | .3209 | .3300 | .3345 | .3372 | .3399 | .3426 |
| 7/16 | 14 | .3447 | .3603 | .3680 | .3726 | .3772 | .3819 |
| 7/16 | 20 | .3726 | .3834 | .3888 | .3921 | .3953 | .3986 |
| 1/2 | 13 | .4001 | .4168 | .4251 | .4301 | .4351 | .4401 |
| 1/2 | 20 | .4351 | .4459 | .4513 | .4546 | .4578 | .4611 |
| 9/16 | 12 | .4542 | .4724 | .4814 | .4868 | .4922 | .4976 |
| 9/16 | 18 | .4903 | .5024 | .5084 | .5120 | .5156 | .5192 |
| 5/8 | 11 | .5069 | .5267 | .5365 | .5424 | .5483 | .5542 |
| 5/8 | 18 | .5528 | .5649 | .5709 | .5745 | .5787 | .5817 |
| 3/4 | 10 | .6201 | .6418 | .6526 | .6591 | .6656 | .6721 |
| 3/4 | 16 | .6688 | .6824 | .6892 | .6932 | .6973 | .7013 |
| 7/8 | 9 | .7307 | .7548 | .7668 | .7740 | .7812 | .7884 |
| 7/8 | 14 | .7822 | .7978 | .8055 | .8101 | .8147 | .8194 |
| 1 | 8 | .8376 | .8648 | .8783 | .8864 | .8945 | .9026 |
| 1 | 14 | .9072 | .9228 | .9305 | .9351 | .9397 | .9444 |
| 1-1/8 | 7 | .9394 | .9705 | .9859 | .9951 | 1.0044 | 1.0137 |
| 1-1/8 | 12 | 1.0168 | 1.0349 | 1.0439 | 1.0493 | 1.0547 | 1.0601 |
| 1-1/4 | 7 | 1.0644 | 1.0955 | 1.1109 | 1.1201 | 1.1294 | 1.1387 |
| 1-1/4 | 12 | 1.1418 | 1.1599 | 1.1689 | 1.1743 | 1.1797 | 1.1851 |
| 1-3/8 | 6 | 1.1585 | 1.1947 | 1.2127 | 1.2235 | 1.2343 | 1.2451 |
| 1-3/8 | 12 | 1.2668 | 1.2849 | 1.2939 | 1.2993 | 1.3047 | 1.3101 |
| 1-1/2 | 6 | 1.2835 | 1.3197 | 1.3377 | 1.3485 | 1.3593 | 1.3701 |
| 1-1/2 | 12 | 1.3918 | 1.4099 | 1.4189 | 1.4243 | 1.4297 | 1.4351 |
