The thread insert (steel thread insert) is a new type of threaded fastener, which is a kind of spring-shaped concentric body of internal and external threads made of high-precision diamond section stainless steel wire. Thread sets, such as products, can meet international standards for high-precision internal thread, and their performance is superior to the thread formed by tapping. It is mainly applied to the mechanical parts of metal or non-metal materials (such as aluminum, magnesium and other light alloy engineering materials), which can form standard internal thread with high strength, wear resistance and high precision. Typical applications: high voltage switchgear, hydraulic machinery, welding equipment, tobacco machinery, microwave communication, auto parts, air separation equipment, coal machine, power machinery, textile chemical fiber machinery, etc. 2. When the thread processing error or the damaged inner screw hole is repaired, the screw thread sleeve (wire thread sleeve) can be used as a repair means, and can be quickly and effectively repaired in typical applications: repair after the thread hole of various important parts trips, such as: repair of the injection molding machine template thread hole. 3. It is very convenient and fast to use the screw thread sleeve to convert metric ←→ British screw hole. Typical application: imported equipment or machinery inch screw thread needs to be changed to metric screw thread due to the supply of spare parts.