brief introduction： Anti-loosing screw: Anti-loosing screw is a common type of fastening anti-loosing nut. The anti-loosening nut originated from abroad, which is permanently attached to the thread by special engineering plastics, so that the internal and external threads produce strong reaction force during the tightening process, and the engineering plastics are extruded, which greatly increases the friction force between the internal and external threads and provides the absolute resistance to vibration. Screw a

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