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Aviation Glossary :: Heli-Coil Insert  Aviation Glossary :: Heli-Coil Insert FAA Written Test Preparation
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Heli-Coil Insert
Heli-Coil Insert
The registered trade name of a special helical insert used to restore threads stripped from a bolt hole, or to reinforce the threads in an aluminum casting. The damaged threads are drilled out and new threads are cut with a special oversize tap. A coil of stainless steel wire, with a cross section in the shape of a diamond, is screwed into the hole and serves as the new threads. Heli-Coil inserts are also used to provide durable threads in soft metal castings. Some spark plug holes in aluminum alloy cylinder heads are fitted with Heli-Coil inserts to minimize the wear caused by repeated removal and installation of the spark plugs.
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source: FAA Aviation Maintenance Technician Powerplant Handbook (FAA-H-8083-32)


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