Structural Bolts

Designed to ascertain steel-to-steel connections, Structural bolts (heavy hex) are generally very short in length. A325 and A490 specifications are normally not meant for general applications which include anchor bolts. When it comes to applications, substituting A449 for A325 and A354 grade BD for A490 is considered ideal.

Manufacturing

BBI manufactures A325 & A490 of diameter 1/2″ – 1-1/2″, generally in lengths longer than those largely available in the market.

   


Stock

Grade: F3125 Grade A325 Type 1 diameters: 1/2 – 1″
Lengths: 5″ maximum
Origin: Domestic
Finish: Plain and hot-dip galvanized

Bolt Length Tolerance

Nominal Length, in. Nominal Size, in.
12 58 34 thru 1 118 thru 112
Thru 6 in. -0.12 -0.12 -0.19 -0.25
Over 6 in. -0.19 -0.25 -0.25 -0.25

Structural Bolt Dimensions

Click table to show drawing
Bolt Diameter D F C H T
Body Diameter Width Across Flats Width Across Corners Height Thread Length
Max Basic Max Min Max Min Basic Max Min Basic
12 0.515 78 0.875 0.850 1.010 0.969 516 0.323 0.302 1.00
58 0.642 1116 1.062 1.031 1.227 1.175 2564 0.403 0.378 1.25
34 0.768 114 1.250 1.212 1.443 1.383 1532 0.483 0.455 1.38
78 0.895 1716 1.438 1.394 1.660 1.589 3564 0.563 0.531 1.50
1 1.022 158 1.625 1.575 1.876 1.796 3964 0.627 0.591 1.75
118 1.149 11316 1.812 1.756 2.093 2.002 1116 0.718 0.658 2.00
114 1.277 2 2.00 1.938 2.309 2.209 2532 0.813 0.749 2.00
138 1.404 2316 2.188 2.119 2.526 2.416 2732 0.878 0.810 2.25
112 1.531 238 2.375 2.300 2.742 2.622 1516 0.974 0.902 2.25

Dimensions per ASME B18.2.6 2011

Stock Structural Bolts

Length Diameter
1/2″ 5/8″ 3/4″ 7/8″
Plain Galv. Plain Galv. Plain Galv. Plain Galv.
112 16076 16092
134 16078 16094 16123 16124
2 16080 16096 16125 16126 16021 16022
214 16098 16127 16128 16024
212 16100 16129 16130 16025 16026
234 16132
3 16133 16134
Other sizes available upon request