ASTM A325

Note: In 2016, ASTM A325 was officially withdrawn and replaced by ASTM F3125, in which A325 now becomes a grade under the F3125 specification.  The F3125 specification is a consolidation and replacement of six ASTM standards, including; A325, A325M, A490, A490M, F1852, and F2280.  We are choosing to keep this technical information about the now obsolete A325 specification on our website for reference and informational purposes only.

This info and more on our specialized A325 Microsite

Prior to its withdrawl in 2016, the ASTM A325 specification covered 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 A449. Also refer to Specification A449 for quenched and tempered steel bolts and studs with diameters greater than 1-1/2″ but with similar mechanical properties.

A325 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TYPE 2 Withdrawn November 1991.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.

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.

A325 Mechanical Properties

Size Tensile, ksi Yield, ksi Elong. %, min RA %, min
12 - 1 120 min 92 min 14 35
118 - 112 105 min 81 min 14 35

A325 Type 1 Chemical Properties

Heat Analysis 120ksi, % 150ksi, %
Carbon 0.30 – 0.52 0.30 – 0.48*
Manganese 0.60 min 0.60 min
Phosphorus 0.035 max 0.035 max
Sulfur 0.040 max 0.040 max
Silicon 0.15 – 0.30 -
Boron 0.003 max 0.003 max
Copper - -
Nickel - -
Chromium - -
Molybdenum - -
*Carbon 0.35-0.53% for 1-1/2” A490/150ksi bolts

A325 Type 3 Chemical Properties

Heat Analysis 120ksi, % Comp A 120ksi, % Comp B 120ksi, % Index 150ksi, % Index
Carbon 0.33 – 0.40 0.38 – 0.48 0.30 – 0.52 0.30 – 0.53
Manganese 0.90 – 1.20 0.70 – 0.90 0.60 min 0.60 min
Phosphorus 0.035 max 0.035 max 0.035 max 0.035 max
Sulfur 0.040 max 0.040 max 0.040 max 0.040 max
Silicon 0.15 – 0.30 0.30 – 0.50    
Copper 0.25 – 0.45 0.20 – 0.40 0.20 – 0.60 0.20 – 0.60
Nickel 0.25 – 0.45 0.50 – 0.80 0.20 min* 0.20 min*
Chromium 0.45 – 0.65 0.50 – 0.80 0.20 min 0.20 min
Molybdenum   0.06 max 0.10 min* 0.10 min*
*Either Nickel or Molybdenum must be present in the amount specified *Corrosion Index based on ASTM Guide G101

A325 Recommended Hardware

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 Compatibility Chart has a complete list of specifications.

More Information

You can find more ASTM A325 information and FAQs on our A325-focused microsite www.a325bolts.com.