Wire thread insert is a new thread fasteners, which is made of high strength, high precision and high surface quality of the diamond-shaped cross-section of the steel corrosion around the system, shaped like a spring. Steel screw set into the holes in the outer surface of wire thread inserts fit in the holes by elastic, its inner surface to form a new thread for screw screws or bolts, screws or bolts that do not directly contact with the substrate to protect the the matrix and the screw threads to play to extend the service life, increase the strength of threaded connections, increasing the force of thread in hand, to increase the bearing capacity of threaded connections and fatigue strength, seismic and other anti-loosening effect. Aluminum, magnesium alloy construction materials such as the application of low intensity can significantly improve strength and wear resistance of threads, while wire thread insert thread also improved the situation by force, so that the whole thread hard to improve the strength of thread connection. Wire thread insert can also be used to repair worn or damaged internal thread hole.