Table below provides root area and tensile stress area for stud bolts of inch series threads.
The root and tensile stress areas are based on coarse-thread series for sizes 1-inch and smaller and 8-pitch thread series for sizes 11/8 inch and larger.
| Bolt Size (in) |
Threads per Inch |
Root Area | Tensile Stress Area | ||
|---|---|---|---|---|---|
| in2 | mm2 | in2 | mm2 | ||
| 1/2 | 13 | 0.1257 | 81 | 0.1419 | 92 |
| 5/8 | 11 | 0.202 | 130 | 0.226 | 146 |
| 3/4 | 10 | 0.302 | 195 | 0.334 | 215 |
| 7/8 | 9 | 0.419 | 271 | 0.462 | 298 |
| 1 | 8 | 0.551 | 356 | 0.606 | 391 |
| 1(1/8) | 8 | 0.728 | 470 | 0.790 | 510 |
| 1(1/4) | 8 | 0.929 | 599 | 1.000 | 645 |
| 1(3/8) | 8 | 1.155 | 745 | 1.233 | 795 |
| 1(1/2) | 8 | 1.405 | 907 | 1.492 | 963 |
| 1(5/8) | 8 | 1.68 | 1084 | 1.78 | 1148 |
| 1(3/4) | 8 | 1.98 | 1277 | 2.08 | 1342 |
| 1(7/8) | 8 | 2.30 | 1486 | 2.41 | 1555 |
| 2 | 8 | 2.65 | 1711 | 2.77 | 1787 |
| 2(1/4) | 8 | 3.42 | 2208 | 3.56 | 2297 |
| 2(1/2) | 8 | 4.29 | 2769 | 4.44 | 2865 |
| 2(3/4) | 8 | 5.26 | 3393 | 5.43 | 3503 |
| 3 | 8 | 6.32 | 4080 | 6.51 | 4200 |
| 3(1/4) | 8 | 7.49 | 4831 | 7.69 | 4961 |
| 3(1/2) | 8 | 8.75 | 5645 | 8.96 | 5781 |
| 3(3/4) | 8 | 10.11 | 6522 | 10.34 | 6671 |
| 4 | 8 | 11.57 | 7462 | 11.81 | 7619 |