Steel thread insert (referred to as thread sleeve) is an insert developed to protect the threaded hole of non-ferrous metal and is suitable for threaded connection. Tighten it in the threaded hole of one of the connected parts to form a standard internal thread, and then screw the bolt (or screw) into it. Cold-rolled stainless steel wire is used to make spiral inner and outer concentric thread coils. Its cross section is rhombic, and its shape is similar to that of spiral spring, with high hardness and good surface roughness. When installing wire thread insert, use special tap and installation tool for tapping and installation. The screw is sleeved in the screw hole or nut, which can reduce the uneven stress and impact vibration of the thread, improve the fatigue strength of the thread and reduce the wear resistance and corrosion resistance of the thread. Extend the life of screw holes.
Wire thread insert is a new type of threaded fastener, which can be divided into ordinary type and locking type. It is a spring-shaped concentric body with internal and external threads and is made of high-precision diamond-shaped stainless steel wire. The locking type is to add one or several locking rings on the basis of the ordinary type. Wire thread insert is embedded in the threaded holes of low-strength engineering materials such as aluminum, magnesium alloy, cast iron, glass fiber reinforced plastic and plastic, which can form standard M and MJ threads, and has the functions of high connection strength, impact resistance, impact resistance and wear resistance, and can disperse stress to protect the matrix threads, thus greatly prolonging the service life of the matrix.
In addition, wire thread insert can also be used as a repair method when the thread on the original matrix is broken or disordered, so that the whole matrix will not be scrapped, and the maintenance is convenient, fast and economical.