Square Head Bolts

Square Head Bolt

 

Square head bolts were the industry standard prior to hex bolts gaining prominence. Square bolts are now most commonly used for aesthetic purposes to provide a rustic look in a new structure or to match existing fasteners in an older structure.

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
3/8 0.388 9/16 0.562 0.544 0.795 0.747 1/4 0.268 0.232
1/2 0.515 3/4 0.750 0.725 1.061 0.995 21/64 0.348 0.308
5/8 0.642 15/16 0.938 0.906 1.326 1.244 27/64 0.444 0.400
3/4 0.768 1-1/8 1.125 1.088 1.591 1.494 1/2 0.524 0.476
7/8 0.895 1-5/16 1.312 1.269 1.856 1.742 19/32 0.620 0.568
1 1.022 1-1/2 1.500 1.450 2.121 1.991 21/32 0.684 0.628
1-1/8 1.149 1-11/16 1.688 1.631 2.386 2.239 3/4 0.780 0.720
1-1/4 1.277 1-7/8 1.875 1.812 2.652 2.489 27/32 0.876 0.812
1-3/8 1.404 2-1/16 2.062 1.994 2.917 2.738 29/32 0.940 0.872
1-1/2 1.531 2-1/4 2.250 2.175 3.182 2.986 1 1.036 0.964
1-3/4* 2-9/16 1-3/16
2* 2-15/16 1-5/16
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