Thread geometry - Unified Coarse (UNC)
All dimensions in mm unless otherwise stated.
d1 - Minor thread diameter male d2 - Minor Thread diameter female d3 - Pitch diameter d4 - Major diameter |
Thread | Major diameter | Thread per inch | Pitch diameter | Minor diameter male thread | Minor diameter female thread |
---|---|---|---|---|---|
1 | 0.0730 | 64 | 0.0629 | 0.0544 | 0.0561 |
2 | 0.0860 | 56 | 0.0744 | 0.0648 | 0.0667 |
3 | 0.0990 | 48 | 0.0855 | 0.0741 | 0.0764 |
4 | 0.1120 | 40 | 0.0958 | 0.0822 | 0.0849 |
5 | 0.1250 | 40 | 0.1088 | 0.0952 | 0.0979 |
6 | 0.1380 | 32 | 0.1177 | 0.1008 | 0.1042 |
8 | 0.1640 | 32 | 0.1437 | 0.1268 | 0.1302 |
10 | 0.1900 | 24 | 0.1629 | 0.1404 | 0.1449 |
12 | 0.2160 | 24 | 0.1889 | 0.1664 | 0.1709 |
1/4 | 0.2500 | 20 | 0.2175 | 0.1905 | 0.1959 |
Thread | Major diameter | Thread per inch | Pitch diameter | Minor diameter male thread | Minor diameter female thread |
---|---|---|---|---|---|
5/16 | 0.3125 | 18 | 0.2764 | 0.2464 | 0.2524 |
3/8 | 0.3750 | 16 | 0.3344 | 0.3005 | 0.3073 |
7/16 | 0.4375 | 14 | 0.3911 | 0.3525 | 0.3602 |
1/2 | 0.5000 | 13 | 0.4500 | 0.4084 | 0.4167 |
9/16 | 0.5625 | 12 | 0.5084 | 0.4633 | 0.4723 |
5/8 | 0.6250 | 11 | 0.5660 | 0.5168 | 0.5266 |
3/4 | 0.7500 | 10 | 0.6850 | 0.6309 | 0.6417 |
7/8 | 0.8750 | 9 | 0.8028 | 0.7427 | 0.7547 |
1 | 1.0000 | 8 | 0.9188 | 0.8512 | 0.8647 |
1-1/8 | 1.1250 | 7 | 1.0322 | 0.9549 | 0.9704 |
Thread | Major diameter | Thread per inch | Pitch diameter | Minor diameter male thread | Minor diameter female thread |
---|---|---|---|---|---|
1 1/4 | 1.2500 | 7 | 1.1572 | 1.0799 | 1.0954 |
1-3/8 | 1.3750 | 6 | 1.2667 | 1.1766 | 1.1946 |
1 1/2 | 1.5000 | 6 | 1.3917 | 1.3016 | 1.3196 |
1 3/4 | 1.7500 | 5 | 1.6201 | 1.5119 | 1.5335 |
2 | 2.0000 | 4.5 | 1.8557 | 1.7353 | 1.7594 |
2 1/4 | 2.2500 | 4.5 | 2.1057 | 1.9853 | 2.0094 |
2 1/2 | 2.5000 | 4 | 2.3376 | 2.2023 | 2.2294 |
2 3/4 | 2.7500 | 4 | 2.5876 | 2.4523 | 2.4794 |
3 | 3.0000 | 4 | 2.8376 | 2.7023 | 2.7294 |
3 1/4 | 3.2500 | 4 | 3.0876 | 2.9523 | 2.9794 |
Thread | Major diameter | Thread per inch | Pitch diameter | Minor diameter male thread | Minor diameter female thread |
---|---|---|---|---|---|
3 1/2 | 3.5000 | 4 | 3.3376 | 3.2023 | 3.2294 |
3 3/4 | 3.7500 | 4 | 3.5876 | 3.4523 | 3.4794 |
4 | 4.0000 | 4 | 3.8376 | 3.7023 | 3.7294 |