A washer is positioned at the top of the bolt’s shaft where it meets the head and slides into the mounting hole, preventing the bolt head and nut from scratching or indenting the surfaces of the two fastened parts. This is because threaded fasteners stress the material in which they’re used.ĭuring installation, the washer works by absorbing the compression forces of the bolt as it’s driven into the application. Regardless of the washer chosen, installing with the proper torque is the best way to ensure a reliable hold.īefore a threaded fastener, such as a bolt, is driven into an application’s surface, a washer is often placed through the end for greater protection during installation and over time. Steel and stainless steel are the most common, but other metals and plastics are also used, depending on the application. Washers are available in a variety of types, sizes, and materials (these are split washers).
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