Thread Repair Kit

A thread repair kit restores damaged or worn internal threads in a tapped hole. It usually contains a helical insert and the tools needed to fit it.

A thread repair kit restores damaged internal threads in a tapped hole. It often contains helical inserts, a tap, and an insertion tool. The kit suits repair work where the original thread has stripped or worn.

Helical inserts are often made in stainless steel or carbon steel. Stainless steel resists corrosion, while carbon steel is usually stronger but needs protection from rust.

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 inserts and tools. On receipt, check the insert thread form, the free running of the fitting tool, and that the insert length matches the hole depth.