Key-Locking Insert

A key-locking insert is a threaded sleeve that is installed into a hole to provide strong internal threads. It locks in place with keys that are driven down to prevent rotation.

A key-locking insert repairs or strengthens a tapped hole in a softer material. It takes a screw of the matching thread and class, and keys lock it against rotation. A drill, a tap and a key-setting tool are used to fit it.

Plain finish means no additional coating, leaving the natural surface of the material. Zinc-plated finish adds a zinc layer for mild corrosion resistance.

Key-locking inserts are often made in stainless steel for resistance to corrosion. Stainless steel grades such as 18/8 austenitic are common for general use.

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 that lists the material and dimensions. On receipt, check the keys, threads and finish for defects.