A washer is a thin, ring-shaped mechanical part, usually used between a nut and the connected component. It has a central hole, and its outer diameter is larger than that of the nut, with a simple structure. There is a wide variety of materials. Metal washers are high in strength and wear-resistant, rubber washers are excellent in elasticity and sealing performance, and plastic washers are insulating and corrosion-resistant. Its main functions include distributing pressure, compensating for dimensional errors, providing sealing, shock absorption and buffering, as well as insulation and isolation, etc. It is widely used in many fields such as machinery, construction, and automobiles, playing an important role in ensuring the reliability of connections and the normal operation of equipment.
