Spring washer anti-loosening: The material of the spring washer is spring steel. After assembly, the washer is flattened. Its rebound force can maintain the compression force and friction between the threads, thereby achieving anti-loosening.

Anti-loosening of the jacking nut: The jacking effect of the nut is used to cause the bolt to receive additional tension and additional friction.

Self-locking nut to prevent loosening: One end of the nut is made into a non-circular closing or a radial closing after opening. When the nut is tightened, the closing opening expands, and the elastic force of the closing opening is used to compress the screwed threads. This kind of anti-loosening structure is simple, reliable and can be disassembled and assembled multiple times without reducing the anti-loosening performance.