Thread repair insert

Thread repair insert

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.

Threaded insert varieties

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

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 when unscrewing the fastener.

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.

General installation procedure

The general procedure for repairing a thread with a threaded insert is to:
# Drill out all the damaged thread with the appropriately sized bit
# Tap a thread into the hole using the specified tap
# Thread the insert into the hole
# Break off installation tang or drive in locking keys (as applicable)

References


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