DIN 913 914 915 916 Precision High Strength Tightening Bolt

DIN 913, DIN 914, DIN 915, and DIN 916 are German standard grades for industrial fasteners known as "hexagon socket bolts". Among them:

DIN 913 is a hexagonal flat end set screw;

DIN 914 is an internal hexagonal cone end set screw;

DIN 915 refers to hexagonal convex end set screws;

DIN 916 is a hexagonal concave end set screw.