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Home / Product / Bolt / Heavy Hex Bolt / High-Strength Gr. 8.8 Gr.10.9, Gr.12.9 ASTM A325,A490 Heavy Hex Bolt
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High-Strength Gr. 8.8 Gr.10.9, Gr.12.9 ASTM A325,A490 Heavy Hex Bolt

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.

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  • ASTM A325,A490
  • HNF
  • 20170614

High-Strength Gr. 8.8 Gr.10.9, Gr.12.9 ASTM A325,A490 Heavy  Hex  Bolt

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.Hex Heavy structural bolts are designed for steel-to-steel structural connections. The ASTM A325 and A490 specifications cover high strength heavy hex structural bolts from 1/2" to 1-1/2" diameter. These bolts are intended for use in structural connections and it have shorter thread lengths than standard hex bolts. The A325 and A490 specifications are not intended for general applications.

The ASTM A490 specification covers quenched and tempered, alloy steel, heavy hex structural bolts from 1/2" to 1-1/2" diameter with a 150 ksi to 173ksi tensile. A490 bolts are similar in application and dimensions to A325 Hex Cap Screws heavy hex structural bolts but are made from an alloy steel rather than a medium carbon steel, resulting in a higher strength fastener.

 

 

 

 

 

 

 

 

 


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
1⁄2 0.515 7⁄8 0.875 0.85 1.01 0.969 5⁄16 0.323 0.302 1
5⁄8 0.642 11⁄16 1.062 1.031 1.227 1.175 25⁄64 0.403 0.378 1.25
3⁄4 0.768 11⁄4 1.25 1.212 1.443 1.383 15⁄32 0.483 0.455 1.38
7⁄8 0.895 17⁄16 1.438 1.394 1.66 1.589 35⁄64 0.563 0.531 1.5
1 1.022 15⁄8 1.625 1.575 1.876 1.796 39⁄64 0.627 0.591 1.75
11⁄8 1.149 113⁄16 1.812 1.756 2.093 2.002 11⁄16 0.718 0.658 2
11⁄4 1.277 2 2 1.938 2.309 2.209 25⁄32 0.813 0.749 2
13⁄8 1.404 23⁄16 2.188 2.119 2.526 2.416 27⁄32 0.878 0.81 2.25
11⁄2 1.531 23⁄8 2.375 2.3 2.742 2.622 15⁄16 0.974 0.902 2.25

 

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