|
|
External Thread /Internal Thread |
|
Nominal Size, TPI, Series |
Class |
Allowance |
Maxa Major Max Minor |
Min Major Min Minor |
Min b |
Maxa Pitch |
Min Pitch |
UNRc Minor Dia Major Dia(Min) |
Ext. |
5/8-11 UNC |
1A |
0.0016 |
0.6234 |
0.6052 |
- |
0.5644 |
0.5561 |
0.5152 |
Int. |
|
1B |
|
0.5460 |
0.5270 |
|
0.5767 |
0.5660 |
0.6250 |
Ext. |
5/8-11 UNC |
2A |
0.0016 |
0.6234 |
0.6113 |
0.6052 |
0.5644 |
0.5589 |
0.5152 |
Int. |
|
2B |
|
0.5460 |
0.5270 |
|
0.5732 |
0.5660 |
0.6250 |
Ext. |
5/8-11 UNC |
3A |
0.0000 |
0.6250 |
0.6129 |
- |
0.5660 |
0.5619 |
0.5168 |
Int. |
|
3B |
|
0.5391 |
0.5270 |
|
0.5714 |
0.5660 |
0.6250 |
Ext. |
5/8-12 UN |
2A |
0.0016 |
0.6234 |
0.6120 |
- |
0.5693 |
0.5639 |
0.5242 |
Int. |
|
2B |
|
0.5530 |
0.5350 |
|
0.5780 |
0.5709 |
0.6250 |
Ext. |
5/8-12 UN |
3A |
0.0000 |
0.6250 |
0.6136 |
- |
0.5709 |
0.5668 |
0.5258 |
Int. |
|
3B |
|
0.5463 |
0.5350 |
|
0.5762 |
0.5709 |
0.6250 |
Ext. |
5/8-14 UNS |
2A |
0.0015 |
0.6235 |
0.6132 |
- |
0.5771 |
0.5720 |
0.5385 |
Int. |
|
2B |
|
0.5640 |
0.5480 |
|
0.5852 |
0.5786 |
0.6250 |
Ext. |
5/8-16 UN |
2A |
0.0014 |
0.6236 |
0.6142 |
- |
0.5830 |
0.5782 |
0.5491 |
Int. |
|
2B |
|
0.5710 |
0.5570 |
|
0.5906 |
0.5844 |
0.6250 |
Ext. |
5/8-16 UN |
3A |
0.0000 |
0.6250 |
0.6156 |
- |
0.5844 |
0.5808 |
0.5505 |
Int. |
|
3B |
|
0.5662 |
0.5570 |
|
0.5890 |
0.5844 |
0.6250 |
Ext. |
5/8-18 UNF |
1A |
0.0014 |
0.6236 |
0.6105 |
- |
0.5875 |
0.5805 |
0.5575 |
Int. |
|
1B |
|
0.5780 |
0.5650 |
|
0.5980 |
0.5889 |
0.6250 |
Ext. |
5/8-18 UNF |
2A |
0.0014 |
0.6236 |
0.6149 |
- |
0.5875 |
0.5828 |
0.5575 |
Int. |
|
2B |
|
0.5780 |
0.5650 |
|
0.5949 |
0.5889 |
0.6250 |
Ext. |
5/8-18 UNF |
3A |
0.0000 |
0.6250 |
0.6163 |
- |
0.5889 |
0.5854 |
0.5589 |
Int. |
|
3B |
|
0.5730 |
0.5650 |
|
0.5934 |
0.5889 |
0.6250 |
Ext. |
5/8-20 UN |
2A |
0.0013 |
0.6237 |
0.6156 |
- |
0.5912 |
0.5869 |
0.5642 |
Int. |
|
2B |
|
0.5820 |
0.5710 |
|
0.5981 |
0.5925 |
0.6250 |
Ext. |
5/8-20 UN |
3A |
0.0000 |
0.6250 |
0.6169 |
- |
0.5925 |
0.5893 |
0.5655 |
Int. |
|
3B |
|
0.5787 |
0.5710 |
|
0.5967 |
0.5925 |
0.6250 |
Ext. |
5/8-24 UNEF |
2A |
0.0012 |
0.6238 |
0.6166 |
- |
0.5967 |
0.5927 |
0.5742 |
Int. |
|
2B |
|
0.5900 |
0.5800 |
|
0.6031 |
0.5979 |
0.6250 |
Ext. |
5/8-24 UNEF |
3A |
0.0000 |
0.6250 |
0.6178 |
- |
0.5979 |
0.5949 |
0.5754 |
Int. |
|
3B |
|
0.5869 |
0.5800 |
|
0.6018 |
0.5979 |
0.6250 |
Ext. |
5/8-27 UNS |
2A |
0.0011 |
0.6239 |
0.6172 |
- |
0.5998 |
0.5960 |
0.5798 |
Int. |
|
2B |
|
0.5940 |
0.5850 |
|
0.6059 |
0.6009 |
0.6250 |
Ext. |
5/8-28 UN |
2A |
0.0011 |
0.6239 |
0.6174 |
- |
0.6007 |
0.5969 |
0.5813 |
Int. |
|
2B |
|
0.5950 |
0.5860 |
|
0.6067 |
0.6018 |
0.6250 |
Ext. |
5/8-28 UN |
3A |
0.0000 |
0.6250 |
0.6185 |
- |
0.6018 |
0.5990 |
0.5824 |
Int. |
|
3B |
|
0.5926 |
0.5860 |
|
0.6055 |
0.6018 |
0.6250 |
Ext. |
5/8-32 UN |
2A |
0.0011 |
0.6239 |
0.6179 |
- |
0.6036 |
0.6000 |
0.5867 |
Int. |
|
2B |
|
0.5990 |
0.5910 |
|
0.6093 |
0.6047 |
0.6250 |
Ext. |
5/8-32 UN |
3A |
0.0000 |
0.6250 |
0.6190 |
- |
0.6047 |
0.6020 |
0.5878 |
Int. |
|
3B |
|
0.5969 |
0.5910 |
|
0.6082 |
0.6047 |
0.6250 |
Ext. |
11/16-12 UN |
2A |
0.0016 |
0.6859 |
0.6745 |
- |
0.6318 |
0.6264 |
0.5867 |
Int. |
|
2B |
|
0.6150 |
0.5970 |
|
0.6405 |
0.6334 |
0.6875 |
Ext. |
11/16-12 UN |
3A |
0.0000 |
0.6875 |
0.6761 |
- |
0.6334 |
0.6293 |
0.5883 |
Int. |
|
3B |
|
0.6085 |
0.5970 |
|
0.6387 |
0.6334 |
0.6875 |
Ext. |
11/16-16 UN |
2A |
0.0014 |
0.6861 |
0.6767 |
- |
0.6455 |
0.6407 |
0.6116 |
Int. |
|
2B |
|
0.6340 |
0.6200 |
|
0.6531 |
0.6469 |
0.6875 |
Ext. |
11/16-16 UN |
3A |
0.0000 |
0.6875 |
0.6781 |
- |
0.6469 |
0.6433 |
0.6130 |
Int. |
|
3B |
|
0.6284 |
0.6200 |
|
0.6515 |
0.6469 |
0.6875 |
Ext. |
11/16-20 UN |
2A |
0.0013 |
0.6862 |
0.6781 |
- |
0.6537 |
0.6494 |
0.6267 |
Int. |
|
2B |
|
0.6450 |
0.6330 |
|
0.6606 |
0.6550 |
0.6875 |
Ext. |
11/16-20 UN |
3A |
0.0000 |
0.6875 |
0.6794 |
- |
0.6550 |
0.6518 |
0.6280 |
Int. |
|
3B |
|
0.6412 |
0.6330 |
|
0.6592 |
0.6550 |
0.6875 |
Ext. |
11/16-24 UNEF |
2A |
0.0012 |
0.6863 |
0.6791 |
- |
0.6592 |
0.6552 |
0.6367 |
Int. |
|
2B |
|
0.6520 |
0.6420 |
|
0.6656 |
0.6604 |
0.6875 |
Ext. |
11/16-24 UNEF |
3A |
0.0000 |
0.6875 |
0.6803 |
- |
0.6604 |
0.6574 |
0.6379 |
Int. |
|
3B |
|
0.6494 |
0.6420 |
|
0.6643 |
0.6604 |
0.6875 |
Ext. |
11/16-28 UN |
2A |
0.0011 |
0.6864 |
0.6799 |
- |
0.6632 |
0.6594 |
0.6438 |
Int. |
|
2B |
|
0.6570 |
0.6490 |
|
0.6692 |
0.6643 |
0.6875 |
Ext. |
11/16-28 UN |
3A |
0.0000 |
0.6875 |
0.6810 |
- |
0.6643 |
0.6615 |
0.6449 |
Int. |
|
3B |
|
0.6551 |
0.6490 |
|
0.6680 |
0.6643 |
0.6875 |
Ext. |
11/16-32 UN |
2A |
0.0011 |
0.6864 |
0.6804 |
- |
0.6661 |
0.6625 |
0.6492 |
Int. |
|
2B |
|
0.6610 |
0.6540 |
|
0.6718 |
0.6672 |
0.6875 |
Ext. |
11/16-32 UN |
3A |
0.0000 |
0.6875 |
0.6815 |
- |
0.6672 |
0.6645 |
0.6503 |
Int. |
|
3B |
|
0.6594 |
0.6540 |
|
0.6707 |
0.6672 |
0.6875 |
Ext. |
3/4-10 UNC |
1A |
0.0018 |
0.7482 |
0.7288 |
- |
0.6832 |
0.6744 |
0.6291 |
Int. |
|
1B |
|
0.6630 |
0.6420 |
|
0.6965 |
0.6850 |
0.7500 |
Ext. |
3/4-10 UNC |
2A |
0.0018 |
0.7482 |
0.7353 |
0.7288 |
0.6832 |
0.6773 |
0.6291 |
Int. |
|
2B |
|
0.6630 |
0.6420 |
|
0.6927 |
0.6850 |
0.7500 |
Ext. |
3/4-10 UNC |
3A |
0.0000 |
0.7500 |
0.7371 |
- |
0.6850 |
0.6806 |
0.6309 |
Int. |
|
3B |
|
0.6545 |
0.6420 |
|
0.6907 |
0.6850 |
0.7500 |
Ext. |
3/4-12 UN |
2A |
0.0017 |
0.7483 |
0.7369 |
- |
0.6942 |
0.6887 |
0.6491 |
Int. |
|
2B |
|
0.6780 |
0.6600 |
|
0.7031 |
0.6959 |
0.7500 |
Ext. |
3/4-12 UN |
3A |
0.0000 |
0.7500 |
0.7386 |
- |
0.6959 |
0.6918 |
0.6508 |
Int. |
|
3B |
|
0.6707 |
0.6600 |
|
0.7103 |
0.6959 |
0.7500 |
Ext. |
3/4-14 UNS |
2A |
0.0015 |
0.7485 |
0.7382 |
- |
0.7021 |
0.6970 |
0.6635 |
Int. |
|
2B |
|
0.6880 |
0.6730 |
|
0.7103 |
0.7036 |
0.7500 |
Ext. |
3/4-16 UNF |
1A |
0.0015 |
0.7485 |
0.7343 |
- |
0.7079 |
0.7004 |
0.6740 |
Int. |
|
1B |
|
0.6960 |
0.6820 |
|
0.7192 |
0.7094 |
0.7500 |
Ext. |
3/4-16 UNF |
2A |
0.0015 |
0.7485 |
0.7391 |
- |
0.7079 |
0.7029 |
0.6740 |
Int. |
|
2B |
|
0.6960 |
0.6820 |
|
0.7159 |
0.7094 |
0.7500 |
Ext. |
3/4-16 UNF |
3A |
0.0000 |
0.7500 |
0.7406 |
- |
0.7094 |
0.7056 |
0.6755 |
Int. |
|
3B |
|
0.6908 |
0.6820 |
|
0.7143 |
0.7094 |
0.7500 |
Ext. |
3/4-18 UNS |
2A |
0.0014 |
0.7486 |
0.7399 |
- |
0.7125 |
0.7079 |
0.6825 |
Int. |
|
2B |
|
0.7030 |
0.6900 |
|
0.7199 |
0.7139 |
0.7500 |
Ext. |
3/4-20 UNEF |
2A |
0.0013 |
0.7487 |
0.7406 |
- |
0.7162 |
0.7118 |
0.6892 |
Int. |
|
2B |
|
0.7070 |
0.6960 |
|
0.7232 |
0.7175 |
0.7500 |
Ext. |
3/4-20 UNEF |
3A |
0.0000 |
0.7500 |
0.7419 |
- |
0.7175 |
0.7142 |
0.6905 |
Int. |
|
3B |
|
0.7037 |
0.6960 |
|
0.7218 |
0.7175 |
0.7500 |
Ext. |
3/4-24 UNS |
2A |
0.0012 |
0.7488 |
0.7416 |
- |
0.7217 |
0.7176 |
0.6992 |
Int. |
|
2B |
|
0.7150 |
0.7050 |
|
0.7282 |
0.7229 |
0.7500 |
Ext. |
3/4-27 UNS |
2A |
0.0012 |
0.7488 |
0.7421 |
- |
0.7247 |
0.7208 |
0.7047 |
Int. |
|
2B |
|
0.7190 |
0.7100 |
|
0.7310 |
0.7259 |
0.7500 |
Ext. |
3/4-28 UN |
2A |
0.0012 |
0.7488 |
0.7423 |
- |
0.7256 |
0.7218 |
0.7062 |
Int. |
|
2B |
|
0.7200 |
0.7110 |
|
0.7318 |
0.7268 |
0.7500 |
Ext. |
3/4-28 UN |
3A |
0.0000 |
0.7500 |
0.7435 |
- |
0.7268 |
0.7239 |
0.7074 |
Int. |
|
3B |
|
0.7176 |
0.7110 |
|
0.7305 |
0.7268 |
0.7500 |
Ext. |
3/4-32 UN |
2A |
0.0011 |
0.7489 |
0.7429 |
- |
0.7286 |
0.7250 |
0.7114 |
Int. |
|
2B |
|
0.7240 |
0.7160 |
|
0.7344 |
0.7297 |
0.7500 |
Ext. |
3/4-32 UN |
3A |
0.0000 |
0.7500 |
0.7440 |
- |
0.7297 |
0.7270 |
0.7128 |
Int. |
|
3B |
|
0.7219 |
0.7160 |
|
0.7333 |
0.7297 |
0.7500 |
Ext. |
13/16-12 UN |
2A |
0.0017 |
0.8108 |
0.7994 |
- |
0.7567 |
0.7512 |
0.7116 |
Int. |
|
2B |
|
0.7400 |
0.7220 |
|
0.7656 |
0.7584 |
0.8125 |
Ext. |
13/16-12 UN |
3A |
0.0000 |
0.8125 |
0.8011 |
- |
0.7584 |
0.7543 |
0.7133 |
Int. |
|
3B |
|
0.7329 |
0.7220 |
|
0.7638 |
0.7584 |
0.8125 |
Ext. |
13/16-16 UN |
2A |
0.0015 |
0.8110 |
0.8016 |
- |
0.7704 |
0.7655 |
0.7365 |
Int. |
|
2B |
|
0.7590 |
0.7450 |
|
0.7782 |
0.7719 |
0.8125 |
Ext. |
13/16-16 UN |
3A |
0.0000 |
0.8125 |
0.8031 |
- |
0.7719 |
0.7683 |
0.7380 |
Int. |
|
3B |
|
0.7533 |
0.7450 |
|
0.7766 |
0.7719 |
0.8125 |
Ext. |
13/16-20 UNEF |
2A |
0.0013 |
0.8112 |
0.8031 |
- |
0.7787 |
0.7743 |
0.7517 |
Int. |
|
2B |
|
0.7700 |
0.7580 |
|
0.7857 |
0.7800 |
0.8125 |
Ext. |
13/16-20 UNEF |
3A |
0.0000 |
0.8125 |
0.8044 |
- |
0.7800 |
0.7767 |
0.7530 |
Int. |
|
3B |
|
0.7662 |
0.7580 |
|
0.7843 |
0.7800 |
0.8125 |
Ext. |
13/16-28 UN |
2A |
0.0012 |
0.8113 |
0.8048 |
- |
0.7881 |
0.7843 |
0.7687 |
Int. |
|
2B |
|
0.7820 |
0.7740 |
|
0.7943 |
0.7893 |
0.8125 |
Ext. |
13/16-28 UN |
3A |
0.0000 |
0.8125 |
0.8060 |
- |
0.7893 |
0.7864 |
0.7699 |
Int. |
|
3B |
|
0.7801 |
0.7740 |
|
0.7930 |
0.7893 |
0.8125 |
Ext. |
13/16-32 UN |
2A |
0.0011 |
0.8114 |
0.8054 |
- |
0.7911 |
0.7875 |
0.7742 |
Int. |
|
2B |
|
0.7860 |
0.7790 |
|
0.7969 |
0.7922 |
0.8125 |
Ext. |
13/16-32 UN |
3A |
0.0000 |
0.8125 |
0.8065 |
- |
0.7922 |
0.7895 |
0.7753 |
Int. |
|
3B |
|
0.7844 |
0.7790 |
|
0.7958 |
0.7922 |
0.8125 |
Ext. |
7/8-9 UNC |
1A |
0.0019 |
0.8731 |
0.8523 |
- |
0.8009 |
0.7914 |
0.7408 |
Int. |
|
1B |
|
0.7780 |
0.7550 |
|
0.8151 |
0.8028 |
0.8750 |
Ext. |
7/8-9 UNC |
2A |
0.0019 |
0.8731 |
0.8592 |
0.8523 |
0.8009 |
0.7946 |
0.7408 |
Int. |
|
2B |
|
0.7780 |
0.7550 |
|
0.8110 |
0.8028 |
0.8750 |
Ext. |
7/8-9 UNC |
3A |
0.0000 |
0.8750 |
0.8611 |
- |
0.8028 |
0.7981 |
0.7427 |
Int. |
|
3B |
|
0.7681 |
0.7550 |
|
0.8089 |
0.8028 |
0.8750 |
Ext. |
7/8-10 UNS |
2A |
0.0018 |
0.8732 |
0.8603 |
- |
0.8082 |
0.8022 |
0.7542 |
Int. |
|
2B |
|
0.7880 |
0.7670 |
|
0.8178 |
0.8100 |
0.8750 |
Ext. |
7/8-12 UN |
2A |
0.0017 |
0.8733 |
0.8619 |
- |
0.8192 |
0.8137 |
0.7741 |
Int. |
|
2B |
|
0.8030 |
0.7850 |
|
0.8281 |
0.8209 |
0.8750 |
Ext. |
7/8-12 UN |
3A |
0.0000 |
0.8750 |
0.8636 |
- |
0.8209 |
0.8168 |
0.7758 |
Int. |
|
3B |
|
0.7948 |
0.7850 |
|
0.8263 |
0.8209 |
0.8750 |
Ext. |
7/8-14 UNF |
1A |
0.0016 |
0.8734 |
0.8579 |
- |
0.8270 |
0.8189 |
0.7884 |
Int. |
|
1B |
|
0.8140 |
0.7980 |
|
0.8392 |
0.8286 |
0.8750 |
Ext. |
7/8-14 UNF |
2A |
0.0016 |
0.8734 |
0.8631 |
- |
0.8270 |
0.8216 |
0.7884 |
Int. |
|
2B |
|
0.8140 |
0.7980 |
|
0.8356 |
0.8286 |
0.8750 |
Ext. |
7/8-14 UNF |
3A |
0.0000 |
0.8750 |
0.8647 |
- |
0.8286 |
0.8245 |
0.7900 |
Int. |
|
3B |
|
0.8068 |
0.7980 |
|
0.8339 |
0.8286 |
0.8750 |
Ext. |
7/8-16 UN |
2A |
0.0015 |
0.8735 |
0.8641 |
- |
0.8329 |
0.8280 |
0.7900 |
Int. |
|
2B |
|
0.8210 |
0.8070 |
|
0.8407 |
0.8344 |
0.8750 |
Ext. |
7/8-16 UN |
3A |
0.0000 |
0.8750 |
0.8656 |
- |
0.8344 |
0.8308 |
0.8005 |
Int. |
|
3B |
|
0.8158 |
0.8070 |
|
0.8391 |
0.8344 |
0.8750 |
Ext. |
7/8-18 UNS |
2A |
0.0014 |
0.8736 |
0.8649 |
- |
0.8375 |
0.8329 |
0.8075 |
Int. |
|
2B |
|
0.8280 |
0.8150 |
|
0.8449 |
0.8389 |
0.8750 |
Ext. |
7/8-20 UNEF |
2A |
0.0013 |
0.8737 |
0.8656 |
- |
0.8412 |
0.8368 |
0.8142 |
Int. |
|
2B |
|
0.8320 |
0.8210 |
|
0.8482 |
0.8425 |
0.8750 |
Ext. |
7/8-20 UNEF |
3A |
0.0000 |
0.8750 |
0.8669 |
- |
0.8425 |
0.8392 |
0.8155 |
Int. |
|
3B |
|
0.8287 |
0.8210 |
|
0.8468 |
0.8425 |
0.8750 |
Ext. |
7/8-24 UNS |
2A |
0.0012 |
0.8738 |
0.8666 |
- |
0.8467 |
0.8426 |
0.8242 |
Int. |
|
2B |
|
0.8400 |
0.8300 |
|
0.8532 |
0.8479 |
0.8750 |
Ext. |
7/8-27 UNS |
2A |
0.0012 |
0.8738 |
0.8671 |
- |
0.8497 |
0.8458 |
0.8297 |
Int. |
|
2B |
|
0.8440 |
0.8350 |
|
0.8560 |
0.8509 |
0.8750 |
Ext. |
7/8-28 UN |
2A |
0.0012 |
0.8738 |
0.8673 |
- |
0.8506 |
0.8468 |
0.8312 |
Int. |
|
2B |
|
0.8450 |
0.8360 |
|
0.8568 |
0.8518 |
0.8750 |
Ext. |
7/8-28 UN |
3A |
0.0000 |
0.8750 |
0.8685 |
- |
0.8518 |
0.8489 |
0.8324 |
Int. |
|
3B |
|
0.8426 |
0.8360 |
|
0.8555 |
0.8518 |
0.8750 |
Ext. |
7/8-32 UN |
2A |
0.0011 |
0.8739 |
0.8679 |
- |
0.8536 |
0.8500 |
0.8367 |
Int. |
|
2B |
|
0.8490 |
0.8410 |
|
0.8594 |
0.8547 |
0.8750 |
Ext. |
7/8-32 UN |
3A |
0.0000 |
0.8750 |
0.8690 |
- |
0.8547 |
0.8520 |
0.8378 |
Int. |
|
3B |
|
0.8469 |
0.8410 |
|
0.8583 |
0.8547 |
0.8750 |
a For Class 2A threads with coating (plating) the max. is increased by the allowance, to the basic size. This is the same value as Class 3A. |
b For uncoated hot-rolled, but not standard fasteners with cold rolled threads |
c UN series external thread, Max.Diameter |
= |
Basic - Allowance, for Class 1A and 2A |
|
= | Basic for Class 3A |
|