Rectangular washers are a type of hardware component that is designed to distribute the load of a threaded fastener, such as a bolt or nut, over a larger surface area. Unlike traditional round washers, square washers have a square shape with four equal sides. This design helps prevent the fastener from loosening or becoming misaligned due to vibrations or other external forces. Square washers are commonly used in construction, automotive, and industrial applications where stability and security are essential.