A rubber washer is a ring made of rubber used in mechanical devices. It is used to prevent vibration from spreading from one part to another, reducing the noise levels.
Why do we use washers?
A washer is a thin plate (typically disk-shaped) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a screw or nut. ... High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to Brinelling after the torque is applied.