Heavy Hex Bolt

A heavy hex bolt is a large hexagon head bolt with a thicker head and larger across flats than a standard hex bolt. It is used in structural steel connections and other high load applications.

A heavy hex bolt clamps structural steel members through a drilled hole. It takes a heavy hex nut of the same thread and class, and often a hardened washer. A spanner or impact wrench usually tightens it.

Hot dip galvanising provides a thick zinc coating for outdoor and corrosive environments. PTFE coating reduces friction and offers some corrosion resistance, often used where controlled tightening is needed.

This kind of bolt is often made in alloy steel. Alloy steel allows high strength grades and is suitable for critical structural joints.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a mill test certificate and a certificate of conformance. On receipt, check the head markings, dimensions and thread condition. Verify the finish is uniform and free from damage.