Unterlegscheiben, or washers, are flat, disc-shaped pieces of material used in various mechanical applications. They are typically placed between a fastener, like a screw or bolt, and the surface it is being fastened to. Their primary purpose is to distribute the load of the fastener, preventing damage to the surface and reducing the risk of loosening over time. These components come in various sizes and materials, including metal, plastic, and rubber, depending on the specific requirements of the application. Unterlegscheiben are essential in construction, automotive, and machinery industries, ensuring stability and durability in assembled parts.