A325M Heavy Hex Bolt

A325M Heavy Hex Bolt is a metric, high-strength structural bolt conforming to ASTM A325M specification. It features a heavy hex head (larger than a standard hex head) for increased bearing surface and wrench engagement. Typically used in steel-to-steel structural connections, it offers high tensile strength (approximately 830–1040 MPa, depending on property class, e.g., Class 8.8 or 10.9 equivalent). Common surface finishes include plain, hot-dip galvanized, or mechanically galvanized for corrosion resistance. It is often paired with a heavy hex nut and washers for pre-tensioned bolting applications in bridges, buildings, and other heavy steel structures.