HDG or Galvanized Heavy Hex Bolts/Steel Structure Bolts ASTM A325
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HDG or Galvanized Heavy Hex Bolts/Steel Structure Bolts ASTM A325

Buy HDG or Galvanized Heavy Hex Bolts/Steel Structure Bolts ASTM A325 which is of high quality directly with low price.
Heavy hex bolts have a head that is larger than a standard (finish) hex head. Standard heavy hex bolts are made of low to mid carbon steel. The large head offers a greater bearing surface that distributes the clamping load over a greater area.
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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HDG or Galvanized Heavy Hex Bolts/Steel Structure Bolts ASTM A325



Heavy hex bolts have a head that is larger than a standard (finish) hex head. Standard heavy hex bolts are made of low to mid carbon steel. The large head offers a greater bearing surface that distributes the clamping load over a greater area.
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.

Heavy hex 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" diameter through 1-1/2" diameter. These bolts are intended for use in structural connections and therefore 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" diameter through 1-1/2" diameter with a minimum 150 ksi 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 Length Tolerance
Nominal Length, in. Nominal Size, in.
1⁄2 5⁄8 3⁄4 thru 1 11⁄8 thru 11⁄2
Thru 6 in. -0.12 -0.12 -0.19 -0.25
Over 6 in. -0.19 -0.25 -0.25 -0.25


HEAVY HEX BOLTS - MECHANICAL PROPERTIES
Grade Size Tensile ksi min Yield ksi min
A325 1/2" - 1 120 92
1 1/8 - 1 1/2 105 81
A490 1/2 - 1 1/2 150 130
A193 B7 Up to 2 1/2 125 105
2 5/8 - 4 115 95


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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