Lock washer consists of two washers, the outside is with a radial convex surface, the inner side of the helical surface. The working principle is very simple: when it is assembled, the inner side of the helical tooth surfaces are opposite to each other, and the outer radial convex surfaces are in a state of meshing with the contact surfaces at both ends. When the connecting member is vibrated and the bolt tends to be loosened, only two washers Inside the relative misalignment between the helical surface, resulting in lifting tension, so as to achieve 100% locking effect. Lock washers can be used in all strong vibration environments.