... head machine screw ; flat head countersunk socket cap screw ; flat head socket head cap screw ; hex socket flat head screw ; flat head ... (DIN912 Cup head, DIN913,DIN914,DIN915,DIN916set screw, DIN7991 hex socket flat head screw , ISO7380buttom head, DIN933 DIN931hex bolt, ISO7379 Shoulder ... the Production Plant :Overview of Eagle Metalware: flat head countersunk socket cap screw DIN7991 with 10.9grade