Various machines and components are inseparable from fasteners in the connection assembly. Fasteners bring convenience to the machinery industry, but it has an inevitable weakness, that is, it will loosen itself during severe vibrations, causing damage or disintegration of parts or a complete equipment, causing accidents.Various machines and components are inseparable from fasteners in the connection assembly. Fasteners bring convenience to the machinery industry, but it has an inevitable weakness, that is, it will loosen itself during severe vibrations, causing damage or disintegration of parts or a complete equipment, causing accidents.Various machines and components are inseparable from fasteners in the connection assembly. Fasteners bring convenience to the machinery industry, but it has an inevitable weakness, that is, it will loosen itself during severe vibrations, causing damage or disintegration of parts or a complete equipment, causing accidents.Various machines and components are inseparable from fasteners in the connection assembly. Fasteners bring convenience to the machinery industry, but it has an inevitable weakness, that is, it will loosen itself during severe vibrations, causing damage or disintegration of parts or a complete equipment, causing accidents.