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Hex Bolt Dimensions

Click table to show drawing
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
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