A325 Bolts


We stock import and domestic A325 bolts. A325 bolts are heavy hex structural bolts designed for connecting steel to steel. These bolts differ from standard hex bolts in that they have heavy hex heads (thicker and wider to more effectively distribute the load) and shorter thread lengths (the weakest portion of carbon steel fasteners is the threaded portion so shorter thread lengths creates a stronger bolt) to increase their strength.

A325 bolts are available in diameters ranging from 1/2″ to 1 1/2″  and from 1 1/4″ to 12″ in length. Tensile strengths are 120 ksi for 1/2″ to 1″ in diameter and 105 ksi for 1″ to 1 1/2″. A325 bolts come in plain finish or galvanized and require heavy hex nuts: ASTM A563 grade C or DH nuts are acceptable, and F436 hardened washers. ASTM A194 grade 2H nuts are an alternative as are ASTM F959 compressible-washer-type direct-tension indicator washers.

We stock standard sizes of A325 bolts including the following:
3/4″ x 1 3/4″ A325 bolts
3/4″ x 2″ A325 bolts
3/4 x 2 1/2″ A325 bolts

We stock many other sizes and can get any size that we don’t have in stock. Atlantic Bolt also has material test reports (MTRs) on file digitally for all our structural bolts.

Call (704-597-5082) or email us for a quote today.

(In 2016 the ASTM introduced the new F3125 specification. F3125 replaces six other ASTM standards, including A325. Currently, the F3125 specification is much less known and the A325 specifications is still how our customers refer to these structural bolts. As such, until the ASTM removes the A325 standard, we will continue to use the existing “A325” specification to reference these bolts.)