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Thread Dimensions (Class 2A, 2B, 3A, 3B ANSI B1.1)
| Major Dia. | Minor Dia. | |||
| EXTERNAL | Max. | Min. | Max. | |
| 0/80 | 2A 3A |
.0595 .0600 |
.0563 .0568 |
.0446 .0451 |
| 1/72 | 2A 3A |
.0724 .0730 |
.0689 .0695 |
.0559 .0565 |
| 2/56 | 2A 3A |
.0854 .0860 |
.0813 .0819 |
.0642 .0648 |
| 3/48 | 2A 3A |
.0983 .0990 |
.0938 .0945 |
.0734 .0741 |
| 4/40 | 2A 3A |
.1112 .1120 |
.1061 .1069 |
.0814 .0822 |
| 5/40 | 2A 3A |
.1242 .1250 |
.1191 .1199 |
.0944 .0952 |
| 6/32 | 2A 3A |
.1372 .1380 |
.1312 .1320 |
.1000 .1008 |
| 8/32 | 2A 3A |
.1631 .1640 |
.1571 .1580 |
.1259 .1268 |
| 10/24 | 2A 3A |
.1890 .1900 |
.1818 .1828 |
.1394 .1404 |
| 10/32 | 2A 3A |
.1891 .1900 |
.1831 .1840 |
.1519 .1528 |
| 12/24 | 2A 3A |
.2150 .2160 |
.2078 .2088 |
.1654 .1664 |
| 1/4-20 | 2A 3A |
.2489 .2500 |
.2408 .2419 |
.1894 .1905 |
| 1/4-28 | 2A 3A |
.2490 .2500 |
.2425 .2435 |
.2064 .2074 |
| 5/16-18 | 2A 3A |
.3113 .3125 |
.3026 .3038 |
.2452 .2464 |
| 5/16-24 | 2A 3A |
.3114 .3125 |
.3042 .0353 |
.2618 .2629 |
| 3/8-16 | 2A 3A |
.3737 .3750 |
.3643 .3656 |
.2992 .3005 |
| 3/8-24 | 2A 3A |
.3739 .3750 |
.3667 .3678 |
.3243 .3254 |
| 7/16-14 | 2A 3A |
.4361 .4375 |
.4258 .4272 |
.3511 .3525 |
| 7/16-20 | 2A 3A |
.4362 .4375 |
.4281 .4294 |
.3767 .3780 |
| 1/2-13 | 2A 3A |
.4985 .5000 |
.4876 .4891 |
.4069 .4084 |
| 1/2-20 | 2A 3A |
.4987 .5000 |
.4906 .4919 |
.4392 .4405 |
| 9/16-12 | 2A | .5609 | .5495 | .4617 |
| 9/16-18 | 2A | .5611 | .5524 | .4950 |
| 5/8-11 | 2A 3A |
.6234 .6250 |
.6113 .6129 |
.5152 .5168 |
| 5/8-18 | 2A | .6236 | .6149 | .5575 |
| 3/4-10 | 2A 3A |
.7482 .7500 |
.7353 .7371 |
.6291 .6309 |
| 3/4-16 | 2A | .7485 | .7391 | .6740 |
| 7/8-9 | 2A 3A |
.8731 .8750 |
.8592 .8611 |
.7428 .7427 |
| 7/8-14 | 2A | .8734 | .8631 | .7884 |
| 1-8 | 2A 3A |
.9980 1.000 |
.9830 .9850 |
.8492 .8512 |
| 1-14 | 2A | .9983 | .9880 | .9132 |
| 1-1/8-7 | 2A | 1.1228 | 1.1064 | .9527 |
| 1-1/8-8 | 2A | 1.1229 | 1.1079 | .9741 |
| 1-1/4-7 | 2A | 1.2478 | 1.2314 | 1.0777 |
| 1-1/4-8 | 2A | 1.2479 | 1.2329 | 1.0991 |
| 1-1/2-6 | 2A | 1.4976 | 1.4794 | 1.2992 |
| 1-1/2-8 | 2A | 1.4978 | 1.4828 | 1.3490 |
| Major Dia. | Minor Dia. | |||
| INTERNAL | Max. | Min. | Max. | |
| 0/80 | 2B 3B |
.0465 .0465 |
.0514 .0514 |
.0600 .0600 |
| 1/72 | 2B 3B |
.0580 .0580 |
.0635 .0635 |
.0730 .0730 |
| 2/56 | 2B 3B |
.0667 .0667 |
.0737 .0737 |
.0860 .0860 |
| 3/48 | 2B 3B |
.0764 .0764 |
.0845 .0845 |
.0990 .0990 |
| 4/40 | 2B 3B |
.0849 .0849 |
.0939 .0939 |
.1120 .1120 |
| 5/40 | 2B 3B |
.0979 .0979 |
.1062 .1062 |
.1250 .1250 |
| 6/32 | 2B 3B |
.104 .1040 |
.114 .1140 |
.1380 .1380 |
| 8/32 | 2B 3B |
.130 .1300 |
.139 .1389 |
.1640 .1640 |
| 10/24 | 2B 3B |
.145 .1450 |
.156 .1555 |
.1900 .1900 |
| 10/32 | 2B 3B |
.156 .1560 |
.164 .1641 |
.1900 .1900 |
| 12/24 | 2B 3B |
.171 .1710 |
.181 .1807 |
.2160 .2160 |
| 1/4-20 | 2B 3B |
.196 .1960 |
.207 .2067 |
.2500 .2500 |
| 1/4-28 | 2B 3B |
.211 .2110 |
.220 .2190 |
.2500 .2500 |
| 5/16-18 | 2B 3B |
.252 .2520 |
.265 .2630 |
.3125 .3125 |
| 5/16-24 | 2B 3B |
.267 .2670 |
.277 .2754 |
.3125 .3125 |
| 3/8-16 | 2B 3B |
.307 .3070 |
.321 .3182 |
.3750 .3750 |
| 3/8-24 | 2B 3B |
.330 .3300 |
.3409 .3372 |
.3750 .3750 |
| 7/16-14 | 2B 3B |
.360 .3600 |
.376 .3717 |
.4375 .4375 |
| 6/16-20 | 2B 3B |
.383 .3830 |
.395 .3916 |
.4375 .4375 |
| 1/2-13 | 2B 3B |
.417 .4170 |
.434 .4284 |
.5000 .5000 |
| 1/2-20 | 2B 3B |
.446 .4460 |
.457 .4537 |
.5000 .5000 |
| 9/16-12 | 2B | .472 | .490 | .5625 |
| 9/16-18 | 2B | .502 | .515 | .5625 |
| 5/8-11 | 2B 3B |
.527 .5270 |
.546 .5391 |
.6250 .6250 |
| 5/8-18 | 2B | .565 | .578 | .6250 |
| 3/4-10 | 2B 3B |
.642 .6420 |
.6563 .6545 |
.7500 .7500 |
| 3/4-16 | 2B | .682 | .696 | .7500 |
| 7/8-9 | 2B 3B |
.755 .7550 |
.778 .7681 |
.8750 .8750 |
| 7/8-14 | 2B | .798 | .814 | .8750 |
| 1-8 | 2B 3B |
.865 .8650 |
.890 .8797 |
1.000 1.000 |
| 1-14 | 2B | .92 | .938 | 1.000 |
| 1-1/8-7 | 2B | .970 | .998 | 1.1250 |
| 1-1/8-8 | 2B | .990 | 1.015 | 1.1250 |
| 1-1/4-7 | 2B | 1.095 | 1.123 | 1.2500 |
| 1-1/4-8 | 2B | 1.115 | 1.140 | 1.250 |
| 1-1/2-6 | 2B | 1.320 | 1.350 | 1.5000 |
| 1-1/2-8 | 2B | 1.365 | 1.390 | 1.5000 |
Numbers are for general information only. Absolute Stainless Inc. accepts no liabilities for any inconsistencies or inaccuracies.