The ASTM A325 specification covers 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. 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 A449. 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. A325 Types Â
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Withdrawn November 1991.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.
A325 Connection Types Â
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.
A325 Mechanical Properties Â
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
A325 Chemical Properties Â
Type 1 Bolts
Element
Carbon Steel
Carbon Boron Steel
Alloy Steel
Alloy Boron Steel
Carbon
0.30 - 0.52%
0.30 - 0.52%
0.30 - 0.52%
0.30 - 0.52%
Manganese, min
0.60%
0.60%
0.60%
0.60%
Phosphorus, max
0.040%
0.040%
0.035%
0.035%
Sulfur, max
0.050%
0.050%
0.040%
0.040%
Silicon
0.15-0.30%
0.10 - 0.30%
0.15 - 0.35%
0.15 - 0.35%
Boron
0.0005 - 0.003%
0.0005 - 0.003%
Alloying Elements
*
*
A325 Recommended Hardware Â
Note: Nuts conforming to A194 Grade 2H are a suitable substitute for use with A325 heavy hex structural bolts. The ASTM A563 Nut Compatibility Chart has a complete list of specifications.