Roofing Bolt

A roofing bolt is a fastener with a rounded head and a square nut, used for fixing roofing sheets and panels. It often has a square neck under the head to stop it turning.

A roofing bolt fixes corrugated sheets and panels to a purlin or frame. It often takes a square nut and a washer of the same thread. It can be set with a spanner or a socket.

This kind of bolt is usually made in steel, often with a corrosion resistant finish. The material choice affects strength and outdoor life.

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

Ask for a certificate of conformance and check the head, thread and nut on receipt. A mill test certificate can be requested for the material.