... screw and anchors. Specifications of DIN7991 Hex socket flat head screw:Other names:Din7991 flat head cap screw, BS2470 socket flat head screw,countersunk ... head socket screw ,CSK head screw. ... Screws (DIN912 Cup head, DIN913,DIN914,DIN915,DIN916set screw, DIN7991 Flat head , ISO7380buttom head, DIN933 DIN931hex ...