Structural Bolts

Structural bolts

 

Heavy hex structural bolts are designed for steel-to-steel structural connections. Consequently, they are typically very short. The A325 and A490 specifications are not intended for general applications, including anchor bolts. In these applications, substitutions of A449 for A325 and A354 grade BD for A490 should be considered.

DIMENSION

Bolt Diameter D F C H T
Body Diameter Width Across Flats Width Across Corners Height ThreadLength
Max Basic Max Min Max Min Basic Max Min Basic
1/2 0.515 7/8 0.875 0.850 1.010 0.969 5/16 0.323 0.302 1.00
5/8 0.642 1-1/16 1.062 1.031 1.227 1.175 25/64 0.403 0.378 1.25
3/4 0.768 1-1/4 1.250 1.212 1.443 1.383 15/32 0.483 0.455 1.38
7/8 0.895 1-7/16 1.438 1.394 1.660 1.589 35/64 0.563 0.531 1.50
1 1.022 1-5/8 1.625 1.575 1.876 1.796 39/64 0.627 0.591 1.75
1-1/8 1.149 1-13/16 1.812 1.756 2.093 2.002 11/16 0.718 0.658 2.00
1-1/4 1.277 2 2.00 1.938 2.309 2.209 25/32 0.813 0.749 2.00
1-3/8 1.404 2-3/16 2.188 2.119 2.526 2.416 27/32 0.878 0.810 2.25
1-1/2 1.531 2-3/8 2.375 2.300 2.742 2.622 15/16 0.974 0.902 2.25
Nominal Bolt Size, in. 1/2 5/8 3/4 thru 1 1-1/8 thru 1-1/2
Nominal Bolt Length Tolerance of Length
Thru 6 in.Over 6 in. -0.12-0.19 -0.12-0.25 -0.19-0.25 -0.25-0.25

 

 

 

 

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