What Is a Lock Nut?

Locknuts and self-tightening nuts are common fastening nuts. Including mechanical anti-loosening, riveting and anti-loosening, friction anti-loosening, and structural anti-loosening.

The lock nut originates from abroad. It is permanently attached to the thread by special engineering plastics. During the tightening process of the internal and external threads, the engineering plastics are squeezed to produce a strong reaction force, which greatly increases the internal and external threads. Friction provides absolute resistance to vibration.

This resistance is completely distributed over the entire meshing section of the internal and external threads, and the friction is not related to the tightening pressure between the internal and external threads. Unlike the previous method of back-off, it depends on the friction generated by the pressure after the screws are tightened. Play a back-stop function, once the screw is slightly loose, the pressure is reduced,

Locknuts are nuts that are screwed together with bolts or screws to play a role of fastening. All production machinery must be used as an original. Locknuts are parts that tightly connect machinery and equipment. Threads, lock nuts and screws of the same specifications can be connected together. The following describes in detail 4 ways to prevent the lock nuts from slipping.

Three advantages of lock nuts:

First, superior anti-vibration performance: When the thread is tightened, the thread crest of the bolt's crest tightly enters the 30 ° wedge-shaped slope of the nut and is clamped, and the normal force generated on the wedge-shaped slope and the bolt The axis is at an included angle of 60 ° instead of an included angle of 30 °. Therefore, the normal force generated when the lock nut is tightened is much larger than that of a standard nut, and it has a great ability to prevent loosening and vibration.
Second, strong wear resistance and shear resistance: The 30 ° bevel of the thread bottom of the nut thread can evenly distribute the nut tightening force on the threads of all the teeth. Because the pressing force on the thread surface of each tooth is evenly distributed, The nut can better solve the problems of thread wear and shear deformation.
Third, the repeated use performance is good: a large number of use shows that the lock nut has not been reduced after repeated tightening and disassembly, and the original locking effect can be maintained.

The self-locking and anti-loosening thread fasteners commonly used today are: 2, using various self-locking bolts or ring groove rivets to achieve self-locking; 3, installing various spring washers in the threaded connection pair to achieve thread self-locking; 2. Apply glue to the thread to achieve self-locking ^[2] .