Internal serrated lock washer, outer tooth lock washer

Internal serrated locking washers and outer tooth locking washers are mainly used to increase friction to achieve the purpose of locking. Relying on the hieration force and small elasticity of the tooth tip and the plane of the connected part to prevent the loosening of the threaded connection, it functions like a torsion spring pad and can have the effect of locking and fastening.

When the nut is tightened with a wrench, the upper serrations are embedded in the surface of the part, which has the effect of preventing the nut from loosening. The internal tooth locking washer has the force to push backwards after being tightened, so as to achieve the purpose of tightening.