... , Oxiding, Blasting, Painting, Anodizing, Heat treatment, AlodineTolerancehexagon socket screws: +0.0004/-0, +0/-0.0004 inchStandard ... socket screws we provided can be RoHS compliant. Hexagon socket screws are made by ISO certified manufacturer – Freerun Group Strict quality control ... for hexagon socket screws by IQC, IPQC, FQC, SPC, ...