The DIN 9021 is a standard specification for large outer diameter washers. These washers are designed to distribute the load of a threaded fastener, such as a bolt or nut, over a larger area. This helps to prevent the fastener from loosening or damaging the material it is attached to. The DIN 9021 washers are typically used in mechanical and structural applications where a high load bearing capacity is required. They are manufactured to precise dimensions and specifications to ensure consistent performance and reliability. Overall, the DIN 9021 provides an important solution for ensuring the stability and integrity of fastened components in various industrial and construction settings.