DIN 985 refers to a specific standard established by the Deutsches Institut für Normung (DIN), which is the German Institute for Standardization. This standard pertains to the specifications and requirements for hexagon nuts with a prevailing torque, commonly known as self-locking nuts. The DIN 985 standard outlines the dimensions, material properties, and performance criteria necessary to ensure the reliability and effectiveness of these fasteners in various applications. The self-locking feature is achieved through a design that creates friction between the nut and the bolt, thereby preventing loosening due to vibrations or other external forces. Adhering to DIN 985 is crucial for manufacturers and engineers to ensure that the components meet safety and quality standards in mechanical assemblies.