... brass, copper, alloyFinishPlating, Oxiding, Blasting, Painting, Anodizing, Heat treatment, AlodineTolerancehexagon socket screws: +0.0004/-0, +0/-0.0004 inchStandard DIN912,913 ... by ISO certified manufacturer – Freerun GroupStrict quality control for hexagon socket screws by IQC, IPQC, FQC, SPC, PCP, PPAP to ... us to ask for catalogues and price list. Top Quality din 912 hexagon socket head cap screws