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Screw Thread Limits Table
| Screw Size |
Class Thread |
Major Diameter |
Pitch Diameter |
Minor Diameter |
| Basic |
Max. |
Min. |
Basic |
Max. |
Min. |
Max. |
| 0-80 |
2A |
0.0600 |
0.0595 |
0.0563 |
0.0519 |
0.0514 |
0.0496 |
0.0442 |
| 0-80 |
3A |
0.0600 |
0.0600 |
0.0568 |
0.0519 |
0.0519 |
0.0506 |
0.0447 |
| 1-64. |
2A |
0.0730 |
0.0724 |
0.0686 |
0.0629 |
0.0623 |
0.0603 |
0.0532 |
| 1-64. |
3A |
0.0730 |
0.0730 |
0.0692 |
0.0629 |
0.0629 |
0.0614 |
0.0538 |
| 1-72. |
2A |
0.0730 |
0.0724 |
0.0689 |
0.0640 |
0.0634 |
0.0615 |
0.0554 |
| 1-72. |
3A |
0.0730 |
0.0730 |
0.0695 |
0.0640 |
0.0640 |
0.0626 |
0.0560 |
| 2-56. |
2A |
0.0860 |
0.8540 |
0.0813 |
0.0744 |
0.0738 |
0.0717 |
0.0635 |
| 2-56. |
3A |
0.0860 |
0.0860 |
0.0819 |
0.0744 |
0.0744 |
0.0728 |
0.0641 |
| 2-64. |
2A |
0.0860 |
0.8540 |
0.0816 |
0.0759 |
0.0753 |
0.0733 |
0.0662 |
| 2-64. |
3A |
0.0860 |
0.0860 |
0.0822 |
0.0759 |
0.0759 |
0.0744 |
0.0668 |
| 3-48. |
2A |
0.0990 |
0.0983 |
0.0938 |
0.0855 |
0.0848 |
0.0825 |
0.0727 |
| 3-48. |
3A |
0.0990 |
0.0990 |
0.0945 |
0.0855 |
0.0855 |
0.0838 |
0.0734 |
| 3-56. |
2A |
0.0990 |
0.0983 |
0.0942 |
0.0874 |
0.0867 |
0.0845 |
0.0764 |
| 3-56. |
3A |
0.0990 |
0.0990 |
0.0949 |
0.0874 |
0.0874 |
0.0858 |
0.0771 |
| 4-40. |
2A |
0.1120 |
0.1112 |
0.1061 |
0.0958 |
0.0950 |
0.0925 |
0.0805 |
| 4-40. |
3A |
0.1120 |
0.1120 |
0.1069 |
0.0958 |
0.0958 |
0.0939 |
0.0813 |
| 4-48. |
2A |
0.1120 |
0.1113 |
0.1068 |
0.0985 |
0.0978 |
0.0954 |
0.0857 |
| 4-48. |
3A |
0.1120 |
0.1120 |
0.1075 |
0.0985 |
0.0985 |
0.0967 |
0.0864 |
| 5-40. |
2A |
0.1250 |
0.1242 |
0.1191 |
1.0880 |
1.0800 |
0.1054 |
0.0935 |
| 5-40. |
3A |
0.1250 |
0.1250 |
0.1199 |
1.0880 |
1.0880 |
0.1069 |
0.0943 |
| 5-44. |
2A |
0.1250 |
0.1243 |
0.1195 |
0.1102 |
0.1095 |
0.1070 |
0.0964 |
| 5-44. |
3A |
0.1250 |
0.1250 |
0.1202 |
0.1102 |
0.1102 |
0.1083 |
0.0971 |
| Screw Size |
Class Thread |
Major Diameter |
Pitch Diameter |
Minor Diameter |
| Basic |
Max. |
Min. |
Basic |
Max. |
Min. |
Max. |
| 6-32. |
2A |
0.1380 |
0.1372 |
0.1312 |
0.1177 |
0.1169 |
0.1141 |
0.0989 |
| 6-32. |
3A |
0.1380 |
0.1380 |
0.1320 |
0.1177 |
0.1177 |
0.1156 |
0.0997 |
| 6-40. |
2A |
0.1380 |
0.1372 |
0.1321 |
0.1218 |
0.1210 |
0.1184 |
0.1065 |
| 6-40. |
3A |
0.1380 |
0.1380 |
0.1329 |
0.1218 |
0.1218 |
0.1198 |
0.1073 |
| 8-32. |
2A |
0.1640 |
0.1631 |
0.1571 |
0.1437 |
0.1428 |
0.1399 |
0.1248 |
| 8-32. |
3A |
0.1640 |
0.1640 |
0.1580 |
0.1437 |
0.1437 |
0.1415 |
0.1257 |
| 8-36. |
2A |
0.1640 |
0.1632 |
0.1577 |
0.1460 |
0.1452 |
0.1424 |
0.1291 |
| 8-36. |
3A |
0.1640 |
0.1640 |
0.1585 |
0.1460 |
0.1460 |
0.1439 |
0.1299 |
| 10-24. |
2A |
0.1900 |
0.1890 |
0.1818 |
0.1629 |
0.1619 |
0.1586 |
0.1379 |
| 10-24. |
3A |
0.1900 |
0.1900 |
0.1828 |
0.1629 |
0.1629 |
0.1604 |
0.1389 |
| 10-32. |
2A |
0.1900 |
0.1891 |
0.1831 |
0.1697 |
0.1688 |
0.1658 |
0.1508 |
| 10-32. |
3A |
0.1900 |
0.1900 |
0.1840 |
0.1697 |
0.1697 |
0.1674 |
0.1517 |
| 1/4-20. |
2A |
0.2500 |
0.2489 |
0.2408 |
0.2175 |
0.2164 |
0.2127 |
0.1876 |
| 1/4-20. |
3A |
0.2500 |
0.2500 |
0.2419 |
0.2175 |
0.2175 |
0.2147 |
0.1887 |
| 1/4-28. |
2A |
0.2500 |
0.2490 |
0.2425 |
0.2268 |
0.2258 |
0.2225 |
0.2052 |
| 1/4-28. |
3A |
0.2500 |
0.2500 |
0.2435 |
0.2268 |
0.2268 |
0.2243 |
0.2062 |
| 5/16-18. |
2A |
0.3125 |
0.3113 |
0.3026 |
0.2764 |
0.2752 |
0.2712 |
0.2431 |
| 5/16-18. |
3A |
0.3125 |
0.3125 |
0.3038 |
0.2764 |
0.2764 |
0.2734 |
0.2443 |
| 5/16-24. |
2A |
0.3125 |
0.3114 |
0.3042 |
0.2854 |
0.2843 |
0.2806 |
0.2603 |
| 5/16-24. |
3A |
0.3125 |
0.3125 |
0.3053 |
0.2854 |
0.2854 |
0.2827 |
0.2614 |
| 3/8-16. |
2A |
0.3750 |
0.3737 |
0.3643 |
0.3344 |
0.3331 |
0.3287 |
0.2970 |
| 3/8-16. |
3A |
0.3750 |
0.3750 |
0.3656 |
0.3344 |
0.3344 |
0.3311 |
0.2983 |
| 3/8-24. |
2A |
0.3750 |
0.3739 |
0.3667 |
0.3479 |
0.3468 |
0.3430 |
0.3228 |
| 3/8-24. |
3A |
0.3750 |
0.3750 |
0.3678 |
0.3479 |
0.3479 |
0.3450 |
0.3239 |
| 7/16-14. |
2A |
0.4375 |
0.4361 |
0.4258 |
0.3911 |
0.3897 |
0.3850 |
0.3485 |
| 7/16-14. |
3A |
0.4375 |
0.4375 |
0.4272 |
0.3911 |
0.3911 |
0.3876 |
0.3499 |
| 7/16-20. |
2A |
0.4375 |
0.4362 |
0.4281 |
0.4050 |
0.4037 |
0.3995 |
0.3749 |
| 7/16-20. |
3A |
0.4375 |
0.4375 |
0.4294 |
0.4050 |
0.4050 |
0.4019 |
0.3762 |
| 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 |
Related References:
Screw Thread Limits Table
UNC UNF Threads Per Inch TPI Threads Per Inch
Wood Screw Pilot Hole Sizes Table
Standard NPT National Pipe Thread Tap Drill Sizes Table
ASTM ISO Metric Thread Sizes and Tap Drill Table
Tapping Drill Size and Clearance Drill Size for Metric Threads
Standard Number Drill Sizes Table
Metric Thread Size Tap Drill Table
Standard Tap Drills Clearance Holes Table
Standard Letter Drill Sizes Table
Standard Drill Sizes Decimal Equivalents Table
Socket Head Cap Screw Sizes Dimension Table
SAE Grade ASTM Bolt Identify Marks Mechanical Properties
Steel Bolt Torque Specifications Table
Finished Hex Nut Dimensions
Heavy Hex Nut Dimensions Table
Standard ANSI Type B Flat Washer Sizes
Circumferential Speeds for High Speed Twist Drill Table
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