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sirlam sarl 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 area, reduce pressure per unit area, and protect the connected part's surface 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 relying mainly on friction for anti-loosening, instead adopting the most advanced international anti-loosening technology.