Thread repair insert

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Thread repair inserts are fastener elements used for one of two purposes:

To repair a stripped threaded hole.
To provide a more durable threaded hole in softer materials that can withstand repeated assembly and disassembly of the mating bolt or screw.

1 Threaded insert varieties
2 References
3 External links

[edit] Threaded insert varieties

Thread repair inserts come in two varieties, solid and wire.

[edit] Solid inserts

Solid inserts are tubes with a thread on the inside and another form of engagement (this is often larger threads) on the outside. Some externally threaded solid inserts also have positive locking elements that prevent the insert from backing out during disassembly.

Fredsert® solid threaded inserts are unique from other solid inserts in that they have no mechanical locking, which means they can be easily removed and replaced. The Fredsert design relies on a flanged head, as well as a precision-machined taper on the outside thread, to reliably lock the insert into place.

[edit] Wire inserts

Wire inserts are wires of a specific diameter and shape that are coiled up. Generally these are of larger diameter than the hole they are to go into so that they hold themselves in tightly. Helical screw thread inserts are manufactured by Emhart Teknologies,^[1] Alcoa, and Advanex in the USA, and Armstrong Precision Components in the UK and Europe ^[2]