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  A wire thread insert is a new type of internal thread fastener suitable for threaded connections. It is screwed and fastened into the threaded hole of one of the connected parts to form a standard internal thread, into which a bolt (or screw) is then screwed. Also known as a thread wire sleeve or simply a wire sleeve, it is made from high-precision, smooth-surfaced cold-rolled stainless steel wire shaped into a spring-like concentric body with internal and external threads. It is mainly used to reinforce and protect internal threads in low-strength materials. Its principle is to form an elastic connection between the screw and the base internal thread, eliminating thread manufacturing errors and improving connection strength. Wire thread inserts embedded in threaded holes of low-strength engineering materials such as aluminum, magnesium alloys, cast iron, fiberglass, and plastics can form high-precision internal threads that meet international standards. They feature high connection strength, resistance to vibration, impact, and wear, and can distribute stress to protect the base thread, greatly extending the service life of the base material, and are widely used.