Bolt Dimensions

SQUARE HEAD BOLT DIMENSIONS

Square Head Bolts Dimension

D F C H
Nominal Max Body Width Across Width Across Head Height
Diameter Diameter Flats Max Corners Max Max
1/4" 0.26 0.375 0.53 0.188
5/16" 0.324 0.5 0.707 0.22
3/8" 0.388 0.562 0.795 0.268
7/16" 0.452 0.625 0.884 0.316
1/2" 0.515 0.75 1.061 0.348
5/8" 0.642 0.938 1.326 0.444
3/4" 0.768 1.125 1.591 0.524
7/8" 0.875 1.312 1.856 0.62
1" 1.022 1.5 2.121 0.684
1-1/8" 1.149 1.688 2.386 0.78
1-1/4" 1.277 1.875 2.652 0.876
1-3/8" 1.404 2.062 2.917 0.94