Skip to main content


Mudguard washers or penny washers have wider outside diameters generally used in oversized holes. They can be used as spacers to cover large holes and prevent the fastener from punching through the material. These penny washers are pressed against the underside of a bolt head unto the fastened material to distribute the clamping force. Mudguard washers are normally made from stainless steel and are available in various sizes.