DIN 126 refers to a standardized specification originating from Germany, delineated under the Deutsches Institut für Normung (DIN), which is the German national organization for standardization. This particular standard outlines the requirements for plain washers, which are commonly used in mechanical engineering and construction applications to distribute the load of a threaded fastener, such as a screw or nut, over a larger area. The specifications under DIN 126 include dimensions, material properties, and tolerance levels for these washers, ensuring uniformity and compatibility across applications and industries. By adhering to such standards, manufacturers and engineers can ensure the reliability and effectiveness of their assemblies, contributing to the overall durability and structural integrity of the final product. The standardization process not only facilitates international trade by simplifying the specification process but also enhances safety and efficiency in engineering projects.