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Bolt Thread Dimensions: UNC
1.125 to 2
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 | 1.125 | 0.994 | 0.9704 | 1-1/8 | 3.6286 | 0.6106 | 0.7633 | 492.45 | 7 |
| UNC | 1.25 | 1.2272 | 1.0954 | 1-1/4 | 3.6286 | 0.7753 | 0.9691 | 625.22 | 7 |
| UNC | 1.375 | 1.4849 | 1.1946 | 1-3/8 | 4.2333 | 0.9239 | 1.1549 | 745.1 | 6 |
| UNC | 1.5 | 1.7671 | 1.3196 | 1-1/2 | 4.2333 | 1.1242 | 1.4053 | 906.64 | 6 |
| UNC | 1.75 | 2.4053 | 1.5335 | 1-3/4 | 5.08 | 1.5199 | 1.8999 | 1,225.74 | 5 |
| UNC | 2 | 3.1416 | 1.7594 | 2 | 5.6444 | 1.9985 | 2.4981 | 1,611.67 | 4.5 |
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