The working principle of lock nut is self -locking with friction between nuts and bolts. The anti -loose effect of the locking nut mainly depends on the interaction between the nut and the bolt thread. There are many ways to improve the interaction between threads, such as the improvement of the thread of nuts, increasing roughness of nylon for nylon nuts, and the surface treatment of the thread.

There are several categories of commonly used lock nuts.

1. All-Metal Prevailing Torque Lock nut,such as DIN985. Through two metal pieces of the threaded bottom hole, when fasten with the bolt, the friction between the thread is increased to achieve the purpose of anti -loosening. When the all metal locking nut is fastened, the speed of assembly should not be too high. The all -metal lock nut can be reused, but it should not be installed more than 5 times.

2. Nylon lock nut, such as DIN985 Prevailing Torque Type Hexagon Thin Nuts With nylon Insert, DIN982 Prevailing Torque Type Hexagon Thick Nuts with nylon Insert. When the nylon lock nuts are tightened, the nylon part and the bolt thread form a close cooperation, and the friction resistance is generated under the effect of the elastic force of the nylon to achieve the purpose of preventing looseness.

3. Slotted loucking nuts, such as Hexagon Slotted Castle Lock Nuts. In the process of use, when the bolt into the hex slotted castle nut, it will automatically open the end of the nut, under the action of the nut deformation force, so that the thread is closely matched and friction resistance, in order to achieve the purpose of anti-loosening.

The slotted lock nut has stable torque, good anti-loosening effect and can be reused.