U-Nut

A U-nut is a locknut with a shaped metal body that grips the bolt. It is used where a nut must stay put under vibration.

A U-nut clips onto a panel edge and takes a screw or bolt from the other side. It suits thin sheet where a tapped hole is not practical. A screw of the same thread is matched with it.

This nut is often made in stainless steel or high carbon steel. Stainless steel suits wet or outdoor use, while high carbon steel suits higher strength joints.

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 with the material and thread size. On receipt, check the locking action and that the thread is clean and free from damage.