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pol-necks fasteners: Anti-loosening washers are a type of fastener with a flat, ring-like shape. Placed between the bearing surface of a bolt, screw, or nut and the surface of the connected part, they increase the contact surface area of the connected parts, reduce pressure per unit area, and protect the surfaces of the connected parts from damage. Another type, elastic washers, also prevents nuts from loosening. The anti-loosening washer consists of two pieces. Its unique embedded structure changes the traditional method of achieving anti-loosening primarily through friction, instead adopting the most advanced international anti-loosening technology, utilizing