Hex Bolt Dimensions
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| 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 |
3⁄4 |
0.750 |
0.725 |
0.866 |
0.826 |
11⁄32 |
0.364 |
0.302 |
| 5⁄8 |
0.642 |
15⁄16 |
0.938 |
0.906 |
1.083 |
1.033 |
27⁄64 |
0.444 |
0.378 |
| 3⁄4 |
0.768 |
11⁄8 |
1.125 |
1.088 |
1.299 |
1.240 |
1⁄2 |
0.524 |
0.455 |
| 7⁄8 |
0.895 |
15⁄16 |
1.312 |
1.269 |
1.516 |
1.447 |
37⁄64 |
0.604 |
0.531 |
| 1 |
1.022 |
11⁄2 |
1.500 |
1.450 |
1.732 |
1.653 |
43⁄64 |
0.700 |
0.591 |
| 11⁄8 |
1.149 |
111⁄16 |
1.688 |
1.631 |
1.949 |
1.859 |
3⁄4 |
0.780 |
0.658 |
| 11⁄4 |
1.277 |
17⁄8 |
1.875 |
1.812 |
2.165 |
2.066 |
27⁄32 |
0.876 |
0.749 |
| 13⁄8 |
1.404 |
21⁄16 |
2.062 |
1.994 |
2.382 |
2.273 |
29⁄32 |
0.940 |
0.810 |
| 11⁄2 |
1.531 |
21⁄4 |
2.250 |
2.175 |
2.598 |
2.480 |
1 |
1.036 |
0.902 |
| 15⁄8 |
1.658 |
27⁄16 |
2.438 |
2.356 |
2.815 |
2.616 |
13⁄32 |
1.116 |
0.978 |
| 13⁄4 |
1.785 |
2-5/8 |
2.625 |
2.538 |
3.031 |
2.893 |
15⁄32 |
1.196 |
1.054 |
| 17⁄8 |
1.912 |
213⁄16 |
2.812 |
2.719 |
3.248 |
3.099 |
11⁄4 |
1.276 |
1.130 |
| 2 |
2.039 |
3 |
3.000 |
2.900 |
3.464 |
3.306 |
111⁄32 |
1.388 |
1.175 |
| 21⁄4 |
2.305 |
33⁄8 |
3.375 |
3.262 |
3.897 |
3.719 |
11⁄2 |
1.548 |
1.327 |
| 21⁄2 |
2.559 |
33⁄4 |
3.750 |
3.625 |
4.330 |
4.133 |
121⁄32 |
1.708 |
1.479 |
| Dimensions per ASME B18.2.1 |
