A washer is a flat metal piece that’s designed to distribute the load of a fastener and protect surfaces that could otherwise be damaged by driving a threaded bolt or screw directly into them. Washers can be made of a variety of materials and come in different styles to suit a range of applications, from general washers to heavy-duty ones. Fender washers, also known as penny washers, are flat washers that have a larger outside diameter in proportion to their center hole than standard washers, allowing them to be placed under the head of a nut or bolt and help distribute forces applied during tightening.
Fender washers can also be used to secure fasteners in parts that have rusted or corroded because their large outer diameter provides a surface for the fastener head to catch on, which helps prevent the fastener from accidentally pulling through the part. These washers are often used in automotive repair, sheet metal work and plumbing projects.
Fender washers are available in a wide variety of sizes and materials, including stainless steel and low-carbon steel. They can also be finished with additional strengthening materials like zinc plating and neoprene to provide optimal corrosion resistance in demanding applications. These washers are commonly used in auto body restoration and other sheet metal work, in applications using wood paneling and drywall and in plumbing and electrical projects. fender washers