... ISO7380=ASME B18.3)Hexagon Socket Head Shoulder Screws (ISO7378=ASME B18.3)Hex Socket Set Screws (DIN913-DIN916/ISO4026- ... alloyFinishPlating, Oxiding, Blasting, Painting, Anodizing, Heat treatment, AlodineTolerancehexagon socket screws: +0.0004/-0, +0/-0.0004 inchStandard DIN912,913 ... certified manufacturer – Freerun Group Strict quality control for hexagon socket screws by IQC, IPQC, FQC, SPC, PCP, ...