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 prevent