Washer, also known as washer, is a part that is usually used to pad between the connecting piece and the nut. Its purpose is as a spacer
to protect the surface of the connected piece from being scratched by the nut.
Disperse the nut's pressure on the connected parts and reduce the separation caused by vibration.
Washers are usually metal or plastic, and are generally flat metal rings. Since torque is applied after indentation to prevent loss of preload,
hardened steel washers are required for special occasions. Especially through Insulate steel screws from the aluminum surface.
The taps (or taps, or valves) used in rubber or fiber gaskets to stop the flow of water are sometimes called colloquially as gaskets; however,
although they may look similar, gaskets and Gaskets are usually designed for different functions.