Plain washers A flat washer with a particularly large outer diameter in proportion to its central hole. These are commonly used to spread the load on thin sheet metal, and are named after their use on automobile fenders. They can also be used to make a connection to a hole that has been enlarged by rust or wear.
A washer is a thin plate (typically disk-shaped, but sometimes square) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a bolt or nut. ... Washers often have an outer diameter (OD) about twice their inner diameter (ID), but this can vary quite widely.
H.S.F.G Washer. Coronet load indicating washers are used in the structural industry to provided evidence that the required tension has been achieved. The raised protrusions will crush in relation to the load applied, providing a permanent observation that required tension was achieved.