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ASTM A325

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 TYPE 2 Withdrawn November 1991.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.
M Metric A325.

Connection Types

 SC Slip critical connection.
 N Bearing type connection with threads included in the shear plane.
 X Bearing-type connection with threads excluded from the shear plane.
 

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.


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