The Structure And Characteristics Of Wire Thread Insert

1. The structure of the wire threaded insert:
The wire thread insert is made of high-hardness corrosion-resistant steel wire with a diamond-shaped cross-section. It is a spring-shaped concentric body with internal and external threads. The standard internal thread used for fastening parts, its cross-sectional shape is a combination of two internal and external threads. Wire screw inserts are divided into two types: ordinary type and locking type, each of which has no breaking groove and has breaking groove.
The locking type is a polygonal locking ring with one or more turns added to the ordinary screw sleeve. The elasticity of the locking ring has a braking effect on the screw. Locking type wire thread inserts have all the advantages of common type wire thread inserts, without affecting the installation of screws, and only increase the appropriate torque during installation. 
2. Characteristics of wire thread insert:
(1) The diameter of the wire threaded insert in the free state is slightly larger than the diameter of the screw hole it is installed in. During assembly, the wire threaded sleeve is subjected to the torque of a special wrench to make its diameter smaller, and enters the screw hole that has been tapped with a special tap In the middle, after being installed, the wire thread sleeve produces a spring-like expansion effect, making it firmly fixed in the threaded hole, and will never be brought out with the screw being unscrewed.
(2) Increase the bearing capacity and fatigue strength of the threaded connection: the wire thread sleeve makes the screw form an elastic connection with the internal thread hole where the wire thread sleeve is installed, thus eliminating the screw torque and half-angle error between the internal and external threads, which can be used In the specified length, the load on each thread is evenly distributed, thereby strengthening the internal thread and reducing vibration, so the fatigue strength of the threaded connection of the parts can be improved.
(3) Wear-resisting: the wire thread sleeve is precisely wound by extremely hard cold-rolled stainless steel wire, the hardness of the spiral surface can reach HRC43-50, and the mirror-like surface (the finish can reach 2-4μm) reduces friction and wear , can reduce the torque generated by friction on the screw by 90%, so as to obtain the maximum pre-tightening torque and screw pulling force with the minimum screw tightening torque, prevent the screw from loosening, and make the screws of various materials in the best use state.
(4) Corrosion resistance: Due to the excellent corrosion resistance of the stainless steel wire thread sleeve, it can ensure its performance under various materials and normal environmental conditions, and the assembly using the wire thread sleeve will not stagnate and rust.
(5) Heat resistance: the steel wire thread sleeve can prevent the threaded connection from being stuck or scratched at high temperature.
(6) Saving materials: Compared with ordinary standard internal threads, under the same strength conditions, after using the wire thread sleeve, in order to make the best use of the yield limit, you can choose a screw with a smaller size and higher strength, so that It can save a lot of materials, reduce weight and reduce volume.
(7) The locking type wire screw sleeve can lock the screw in the threaded hole, and when it is subjected to vibration and impact, it can prevent the screw from loosening and falling off, which is better than the usual locking device in terms of process performance. The locking wire thread insert has the torque of multiple disassembly and assembly without reducing the thread, and also has high reusability.