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Current position:ASTM A325/325M/A490/490M

A325/A563/F436 Heavy hex structural bolts

A325/A563/F436 Heavy hex structural bolts
  • Description

Heavy Hex Bolts
SeveralASTM specificationsrequire a hex head that is larger than a standard (finished) hex head. These specifications include: A193, A320and A307B. Although A325 andA490bolts also require a heavy hex head, please refer to Structural Boltsfor dimensional specifications, since these bolts have shorter thread lengths than standard heavy hex bolts.
Manufacturing
Taida Bolt manufactures heavy hex bolts from 1/2" diameter through 2-1/2" diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company's name and/or logo.

 

Standard: ASTM A325/A563/F436  
Dia.: 1/2"-1 1/2";
Length:1 1/4"-8";
Surface treatment: Plain ,Black oxygenation, HDG 
 

Standard Thread Lengths

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

Dimensions

Bolt Diameter D F C H
Body Diameter Width Across Flats Width Across Corners Height
Max Basic Max Min Max Min Basic Max Min
1/2 0.515 7/8 0.875 0.850 1.010 0.969 11/32 0.364 0.302
5/8 0.642 1-1/16 1.062 1.031 1.227 1.175 27/64 0.444 0.378
3/4 0.768 1-1/4 1.250 1.212 1.443 1.383 1/2 0.524 0.455
7/8 0.895 1-7/16 1.438 1.394 1.660 1.589 37/64 0.604 0.531
1 1.022 1-5/8 1.625 1.575 1.876 1.796 43/64 0.700 0.591
1-1/8 1.149 1-13/16 1.812 1.756 2.093 2.002 3/4 0.780 0.658
1-1/4 1.277 2 2.00 1.938 2.309 2.209 27/32 0.876 0.749
1-3/8 1.404 2-3/16 2.188 2.119 2.526 2.416 29/32 0.940 0.810
1-1/2 1.531 2-3/8 2.375 2.300 2.742 2.622 1 1.036 0.902
1-3/4 1.785 2-3/4 2.750 2.662 3.175 3.035 1-5/32 1.196 1.054
2 2.039 3-1/8 3.125 3.025 3.608 3.449 1-11/32 1.388 1.175
2-1/4 2.305 3-1/2 3.500 3.388 4.041 3.862 1-1/2 1.548 1.327
2-1/2 2.559 3-7/8 3.875 3.750 4.474 4.275 1-21/32 1.708 1.479

Dimensions per ASME B18.2.1 1996

Scope
The ASTM A325 specification covers high strength heavy hex structural bolts from ½” 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. Refer to the Structural Bolts page of our site for thread lengths and other related dimensions.
This specification is applicable to heavy hex structural bolts only. For bolts of other configurations and thread lengths with similar mechanical properties, see Specification A 449.
Bolts for general applications, including anchor bolts, are covered by Specification A 449. Also refer to Specification A 449 for quenched and tempered steel bolts and studs with diameters greater than 1-1/2" but with similar mechanical properties.
Types
 TYPE 1
Medium carbon, carbon boron, or medium carbon alloy steel.
 TYPE 2
Withdrawn November 1991.
 TYPE 3
Weathering steel.
 
T
Fully threaded A325. (Restricted to 4 times the diameter in length)
M
Metric A325.

 Connection Types

Mechanical Properties
Size
Tensile, ksi
Yield, ksi
Elong. %, min
RA %, min
1/2 - 1
120 min
92 min
14
35
1-1/8 - 1-1/2
105 min
81 min
14
35
Recommended Nuts and Washers
Nuts
Washers
Type 1
Type 3
Type 1
Type 3
Plain
Galvanized
Plain
A563C, C3, D, DH, DH3
A563DH
A563C3, DH3
F436-1
F436-3
Note: Nuts conforming to A194 Grade 2H are a suitable substitute for use with A325 heavy hex structural bolts. The ASTM A563 Nut
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