Heavy Hex Bolts

Some ASTM specifications might demand a hex head that is larger compared to a normal finished Hex head. The specifications include A320, A193 and A307B. It is true that A325 and A490 bolts also require a heavy hex head; but, it is crucial to refer to Structural Bolts in order to study the dimensional specifications as these bolts are known to possess shorter thread lengths in comparison with the standard heavy Hex bolts.

Applications

Heavy hex bolts sport a range of applications including fastening wood, steel, and different other construction materials, used largely in projects including bridges, buildings, docks, and highway structures. Sometimes, Hex bolts also come with forged heads and these are usually used as headed anchor bolts.

Manufacturing

Baseline Bolts manufactures superior quality heavy hex bolts. With a diameter of 1/2″ – 2-1/2″, these bolts fulfill most specifications of the ASTM, SAE and AASHTO. In fact, we can even create special tooling to help produce nonstandard bolt heads / head dimensions with the client’s preferred logo and/or name.

   


Stock

Baseline Bolt stocks A325 Heavy Hex Structural Bolts.

Standard Thread Lengths

Bolt lengths ≤ 6″: Thread length = (2 X diameter) + 1/4″
Bolt lengths > 6″: Thread length = (2 X diameter) + 1/2″

Heavy Hex Dimensions

Click to show drawing
Bolt Diameter D F C H
Body Diameter Width Across Flats Width Across Corners Height
Max Basic Max Min Max Min Basic Max Min
12 0.515 78 0.875 0.850 1.010 0.969 1132 0.364 0.302
58 0.642 1116 1.062 1.031 1.227 1.175 2764 0.444 0.378
34 0.768 114 1.250 1.212 1.443 1.383 12 0.524 0.455
78 0.895 1716 1.438 1.394 1.660 1.589 3764 0.604 0.531
1 1.022 158 1.625 1.575 1.876 1.796 4364 0.700 0.591
118 1.149 11316 1.812 1.756 2.093 2.002 34 0.780 0.658
114 1.277 2 2.00 1.938 2.309 2.209 2732 0.876 0.749
138 1.404 2316 2.188 2.119 2.526 2.416 2932 0.940 0.810
112 1.531 238 2.375 2.300 2.742 2.622 1 1.036 0.902
158 1.658 2916 2.562 2.481 2.959 2.829 1332 1.116 0.978
134 1.785 234 2.750 2.662 3.175 3.035 1532 1.196 1.054
178 1.912 21516 2.938 2.844 3.392 3.242 114 1.276 1.130
2 2.039 318 3.125 3.025 3.608 3.449 11132 1.388 1.175
214 2.305 312 3.500 3.388 4.041 3.862 112 1.548 1.327
212 2.559 378 3.875 3.750 4.474 4.275 12132 1.708 1.479

Dimensions per ASME B18.2.1 2010