Hex Bolts

Hex Bolts

 

Hex bolts (six sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head. For specifications such as A307 grade B,A325 and A490 that require a heavy hex pattern, refer to dimensional tolerances for heavy hex bolts or structural bolts.

Dimensions

E D F C H
Bolt Diameter Body Diameter Width Across Flats Width Across Corners Height
Max Basic Max Min Max Min Basic Max Min
1/4 0.250 7/16 0.438 0.428 0.505 0.488 5/32 0.163 0.150
5/16 0.313 1/2 0.500 0.489 0.577 0.557 13/64 0.211 0.195
3/8 0.388 9/16 0.562 0.544 0.650 0.620 1/4 0.268 0.226
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 1-1/8 1.125 1.088 1.299 1.240 1/2 0.524 0.455
7/8 0.895 1-5/16 1.312 1.269 1.516 1.447 37/64 0.604 0.531
1 1.022 1-1/2 1.500 1.450 1.732 1.653 43/64 0.700 0.591
1-1/8 1.149 1-11/16 1.688 1.631 1.949 1.859 3/4 0.780 0.658
1-1/4 1.277 1-7/8 1.875 1.812 2.165 2.066 27/32 0.876 0.749
1-3/8 1.404 2-1/16 2.062 1.994 2.382 2.273 29/32 0.940 0.810
1-1/2 1.531 2-1/4 2.250 2.175 2.598 2.480 1 1.036 0.902
1-3/4 1.785 2-5/8 2.625 2.538 3.031 2.893 1-5/32 1.196 1.054
2 2.039 3 3.000 2.900 3.464 3.306 1-11/32 1.388 1.175
2-1/4 2.305 3-3/8 3.375 3.262 3.897 3.719 1-1/2 1.548 1.327
2-1/2 2.559 3-3/4 3.750 3.625 4.330 4.133 1-21/32 1.708 1.479

 

All dimensions shown in inches. Dimensions per ASME B18.2.1 1996

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