The DIN 9021 standard specifies a type of washer that is commonly used in various industrial applications. This washer is designed to distribute the load of a threaded fastener, such as a bolt or nut, over a larger surface area to prevent damage to the material being fastened. The DIN 9021 washer is typically made of metal and is available in different sizes to accommodate various fastener diameters. It is an essential component in many mechanical and structural systems to ensure proper fastening and stability.