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Flat round washers or plain washers are standard washers used for general-purpose applications to evenly distribute the load over a large area. They are pressed against the underside of a bolt head unto the fastened material to distribute the clamping force and act as spacers. Additionally, they serve as stoppers to prevent the fastener from punching through the material. They are regularly used in manufacturing, construction, and domestic applications. Flat round washers are available in either stainless, mild, high-tensile, and hardened steel.