Washers under nut
A washer is a fastener and is placed under a nut or head of another fastener (E.g. a screw) and serves to increase the area of the support surface, or to prevent the fastener from loosening itself. The washer protects the surface from injury and distributes the load over a larger surface. A washer with a wide periphery is a fastener placed under a nut or head of another fastener (E.g. a screw) and serves to increase and distribute the area of the supporting surface, as well as to prevent the fastener from loosening itself. The washer protects the surface from damage.