DIN 961 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 a particular type of fastener, specifically a hexagon head screw with a metric thread. The DIN 961 standard outlines the dimensions, mechanical properties, and material specif... https://rsgfasteners.com/din-961.html