Dome Lock Nut

A dome lock nut is a nut with a domed top, often used to cover the end of a bolt and resist loosening.

A dome lock nut clamps a joint and resists loosening from vibration. It takes a bolt or stud of the same thread and class. A spanner or socket sets it.

Hot dip galvanised is a zinc coating applied by dipping the part in molten zinc. It gives a thick coating that suits outdoor and corrosive exposure.

This kind of nut is often made in stainless steel. Stainless steel resists rust and suits outdoor or wet areas.

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 for the material and finish. On receipt, check the thread, the dome shape, and that the coating is even.