Heavy Hex Dimensions
| Bolt Diameter | D | F | C | H | |||||
|---|---|---|---|---|---|---|---|---|---|
| Body Diameter | Width Across Flats | Width Across Corners | Height | ||||||
| Max | Basic | Max | Min | Max | Min | Basic | Max | Min | |
| 1⁄2 | 0.515 | 7⁄8 | 0.875 | 0.850 | 1.010 | 0.969 | 11⁄32 | 0.364 | 0.302 |
| 5⁄8 | 0.642 | 11⁄16 | 1.062 | 1.031 | 1.227 | 1.175 | 27⁄64 | 0.444 | 0.378 |
| 3⁄4 | 0.768 | 11⁄4 | 1.250 | 1.212 | 1.443 | 1.383 | 1⁄2 | 0.524 | 0.455 |
| 7⁄8 | 0.895 | 17⁄16 | 1.438 | 1.394 | 1.660 | 1.589 | 37⁄64 | 0.604 | 0.531 |
| 1 | 1.022 | 15⁄8 | 1.625 | 1.575 | 1.876 | 1.796 | 43⁄64 | 0.700 | 0.591 |
| 11⁄8 | 1.149 | 113⁄16 | 1.812 | 1.756 | 2.093 | 2.002 | 3⁄4 | 0.780 | 0.658 |
| 11⁄4 | 1.277 | 2 | 2.00 | 1.938 | 2.309 | 2.209 | 27⁄32 | 0.876 | 0.749 |
| 13⁄8 | 1.404 | 23⁄16 | 2.188 | 2.119 | 2.526 | 2.416 | 29⁄32 | 0.940 | 0.810 |
| 11⁄2 | 1.531 | 23⁄8 | 2.375 | 2.300 | 2.742 | 2.622 | 1 | 1.036 | 0.902 |
| 15⁄8 | 1.658 | 29⁄16 | 2.562 | 2.481 | 2.959 | 2.829 | 13⁄32 | 1.116 | 0.978 |
| 13⁄4 | 1.785 | 23⁄4 | 2.750 | 2.662 | 3.175 | 3.035 | 15⁄32 | 1.196 | 1.054 |
| 17⁄8 | 1.912 | 215⁄16 | 2.938 | 2.844 | 3.392 | 3.242 | 11⁄4 | 1.276 | 1.130 |
| 2 | 2.039 | 31⁄8 | 3.125 | 3.025 | 3.608 | 3.449 | 111⁄32 | 1.388 | 1.175 |
| 21⁄4 | 2.305 | 31⁄2 | 3.500 | 3.388 | 4.041 | 3.862 | 11⁄2 | 1.548 | 1.327 |
| 21⁄2 | 2.559 | 37⁄8 | 3.875 | 3.750 | 4.474 | 4.275 | 121⁄32 | 1.708 | 1.479 |
|
Dimensions per ASME B18.2.1 |
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