The principle of nuts mainly includes the friction principle and the deformation principle.
Friction principle
The basic principle of nut locking is to use the friction between the bolt and the nut. When the nut is tightened, the threads between the bolt and the nut are in close contact, forming friction. This friction can prevent the relative movement of the bolt and the nut when subjected to external loads, thereby achieving a locking effect. The magnitude of the friction depends on the geometry of the thread, the material properties, and the magnitude of the tightening torque.
Deformation principle
In addition to friction, nut locking also depends on the deformation of the material. During the tightening process, both the nut and the bolt will undergo a certain amount of elastic deformation. This deformation can increase the contact area between the threads, thereby increasing friction. When the external load tries to separate the bolt and the nut, the elastic recovery force of the material will produce a reverse friction force, further preventing loosening
