... manufacture and distributor of Rc fasteners and Rc parts Hex Socket Button Head Screws (ISO7380=ASME B18.3)Material : ... 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, PPAP ...