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Bolt Thread Dimensions: UNC
0.25 to 1
Bolt thread dimensions — UNC, UNF, ISO coarse/fine thread series with pitch, tensile stress area, and threads per inch
| thread series | nominal diameter | gross area in2 (in2) | minor diameter in (in) | nominal size | pitch mm (mm) | root area in2 (in2) | tensile stress area in2 (in2) | tensile stress area mm2 (mm2) | threads per inch (threads/in) |
|---|---|---|---|---|---|---|---|---|---|
| UNC | 0.25 | 0.0491 | 0.1959 | 1/4 | 1.27 | 0.0254 | 0.0318 | 20.52 | 20 |
| UNC | 0.3125 | 0.0767 | 0.2524 | 5/16 | 1.4111 | 0.0419 | 0.0524 | 33.81 | 18 |
| UNC | 0.375 | 0.1104 | 0.3073 | 3/8 | 1.5875 | 0.062 | 0.0775 | 50 | 16 |
| UNC | 0.4375 | 0.1503 | 0.3602 | 7/16 | 1.8143 | 0.085 | 0.1063 | 68.58 | 14 |
| UNC | 0.5 | 0.1963 | 0.4167 | 1/2 | 1.9538 | 0.1135 | 0.1419 | 91.55 | 13 |
| UNC | 0.5625 | 0.2485 | 0.4723 | 9/16 | 2.1167 | 0.1456 | 0.182 | 117.42 | 12 |
| UNC | 0.625 | 0.3068 | 0.5266 | 5/8 | 2.3091 | 0.1808 | 0.226 | 145.81 | 11 |
| UNC | 0.75 | 0.4418 | 0.6418 | 3/4 | 2.54 | 0.2672 | 0.334 | 215.48 | 10 |
| UNC | 0.875 | 0.6013 | 0.7547 | 7/8 | 2.8222 | 0.3694 | 0.4617 | 297.87 | 9 |
| UNC | 1 | 0.7854 | 0.8647 | 1 | 3.175 | 0.4846 | 0.6057 | 390.77 | 8 |
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