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. Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer). Our Washers are widely used to distribute the load of bolts or nuts, also as a spacer, spring, wear pad, preload indicating device, locking device, and to reduce vibration. We are the Manufacturer of Conical washers, Machine washers, Plain washers, Serrated washers, Square washers, Spring and Star washers. Washers often have an outer diameter (OD) about twice their inner diameter (ID), but this can vary quite widely. Washers are usually metal or plastic.