Nut

A nut is a threaded fastener that screws onto a bolt or stud to hold parts together. It is used with a matching bolt or screw to clamp components.

A nut threads onto a bolt or stud to clamp parts together. It usually takes a washer under the bearing face and matches the thread and class of the bolt or stud. A spanner or socket of the right size sets it.

Nuts are often made in steel, stainless steel, brass, plastic, 400-nickel, or other corrosion resistant alloys. The material affects strength and resistance to corrosion. Plastic nuts suit light duty or electrical insulation.

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 a mill test certificate for the material. Check the thread fit, the finish condition and the marking on receipt.