Gasket

Washers, also known as washers, are usually used to cushion the parts between the connector and the nut, the purpose is to serve as a spacer to protect the surface of the connector from being scratched by the nut, dispersing the pressure of the nut against the connector, and Reduce the vibration caused by the detachment. The gasket is usually metal or plastic, usually a flat metal ring. Due to the indentation torque is applied to prevent the loss of preload, special occasions require hardened steel washers. Especially by insulating the steel screws from the aluminum surface.