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Reference Tables -- Screw Thread Limits

 

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Screw Thread Limits
Screw Size Class Thread Major Diameter Pitch Diameter Minor Diameter
Basic Max. Min. Basic Max. Min. Max.
1/2-13. 2A 0.5000 0.4985 0.4876 0.4500 0.4485 0.4435 0.4041
1/2-13. 3A 0.5000 0.5000 0.4891 0.4500 0.4500 0.4463 0.4056
1/2-20. 2A 0.5000 0.4987 0.4906 0.4675 0.4662 0.4619 0.4374
1/2-20. 3A 0.5000 0.5000 0.4919 0.4675 0.4675 0.4643 0.4387
5/8-11. 2A 0.6250 0.6234 0.6113 0.5660 0.5644 0.5589 0.5119
5/8-11. 3A 0.6250 0.6250 0.6129 0.5660 0.5660 0.5619 0.5135
5/8-18. 2A 0.6250 0.6236 0.6149 0.5889 0.5875 0.5828 0.5554
5/8-18. 3A 0.6250 0.6250 0.6163 0.5889 0.5889 0.5854 0.5568
3/4-10. 2A 0.7500 0.7482 0.7353 0.6850 0.6832 0.6773 0.6255
3/4-10. 3A 0.7500 0.7500 0.7371 0.6850 0.6850 0.6806 0.6273
3/4-16. 2A 0.7500 0.7485 0.7391 0.7094 0.7079 0.7029 0.6718
3/4-16. 3A 0.7500 0.7500 0.7406 0.7094 0.7094 0.7056 0.6733
7/8 -9. 2A 0.8750 0.8731 0.8592 0.8028 0.8009 0.7946 0.7368
7/8 -9. 3A 0.8750 0.8750 0.8611 0.8028 0.8028 0.7981 0.7387
7/8-14. 2A 0.8750 0.8734 0.8631 0.8286 0.8270 0.8216 0.7858
7/8-14. 3A 0.8750 0.8750 0.8647 0.8286 0.8286 0.8245 0.7874
1 -8. 2A 1.0000 0.9980 0.9830 0.9188 0.9168 0.9100 0.8446
1 -8. 3A 1.0000 1.0000 0.9850 0.9188 0.9188 0.9137 0.8466
1 -12. 2A 1.0000 0.9982 0.9868 0.9459 0.9441 0.9382 0.8960
1 -12. 3A 1.0000 1.0000 0.9886 0.9459 0.9459 0.9415 0.8978
1-1/8-7. 2A 1.1250 1.1228 1.1064 1.0322 1.0300 1.0228 0.9475
1-1/8-12. 2A 1.1250 1.1232 1.1118 1.0709 1.0691 1.0631 1.0210
1-1/4-7 2A 1.2500 1.2478 1.2314 1.1572 1.1550 1.1476 1.0725
1-1/4-12 2A 1.2500 1.2482 1.2368 1.1959 1.1941 1.1879 1.1460
1-3/8-6 2A 1.3750 1.3726 1.3544 1.2667 1.2643 1.2563 1.1681
1-3/8-12 2A 1.3750 1.3731 1.3617 1.3209 1.3190 1.3127 1.2709
1-1/2-6 2A 1.5000 1.4976 1.4794 1.3917 1.3893 1.3812 1.2931
1-1/2-12 2A 1.5000 1.4981 1.4867 1.4459 1.4440 1.4376 1.3959
1-3/4-5 2A 1.7500 1.7473 1.7268 1.6201 1.6174 1.6085 1.5019
2 - 4-1/2 2A 2.0000 1.9971 1.9751 1.8557 1.8528 1.8433 1.7245

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