Helical Insert

A helical insert is a coiled wire thread insert that is screwed into a tapped hole. It provides a wear-resistant internal thread and can repair a damaged thread or protect a softer parent material.

A helical insert fits into a tapped hole to provide a durable internal thread. It protects the parent thread and allows a screw or bolt of the same thread to be fitted and removed many times. A special insertion tool winds it into place.

This insert is often made in stainless steel for corrosion resistance and to avoid galling with the bolt. It can be made in other alloys where a specific property is needed.

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 material and thread form. Check on receipt the free length, coil condition and that the insert passes a go no-go gauge. Confirm the driving tang is present if required.