DIN 931 refers to a specific standard established by the Deutsches Institut für Normung (DIN), which outlines the specifications for hexagon head bolts with a partially threaded shank. This standard is crucial in ensuring that the bolts meet certain mechanical and dimensional requirements, thereby guaranteeing their reliability and performance in various applications. The DIN 931 stan... https://rsgfasteners.com/din-931-iso-4014.html