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ASTM A325/325M/A490/490M

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ASTM A325 Bolts

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.

ASTM F2329

ASTM F2329 covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied

ASTM F1554

The ASTM F1554 specification was introduced in 1994 and covers anchor bolts designed to anchor structural supports to concrete foundations. F1554 anchor bolts 

ASTM A563

The ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners.

ASTM A490

The ASTM A490 specification covers quenched and tempered, alloy steel, heavy hex structural bolts from ½” diameter through 1½” diameter with a minimum 150 ksi tensile.

ASTM A449

ASTM A449 covers headed bolts, rods, and anchor bolts in diameters ranging from 1/4"" through 3"" inclusive. It is a medium strength bolt manufactured from a medium carbon or alloy steel that develops its mechanical values through a heat treating process. It is intended for general engineering applications.

A325/A563/F436 Heavy hex structural bolts

A325/A563/F436 Heavy hex structural bolts

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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A490/A490M Heavy hex structural bolts