... -plated, blue black zinc-plated,rust preventive oil, titanium alloy galvanized, silver plating, plastic, electroplating, anodizing ... the production of CNC/AUTO lathe, springs, shafts, screws, stamping parts and other metal parts. Our main ... HEXAGON SOCKET HEAD BOLTS DIN912ATANDARD:DIN912 /ISO4762SIZE:M3--M24GRADE:8.8,10.9,12.9FINISHED:ZINC PLATED,BLACK OXIDE,HDG,PLAIN,NICKLEPACKING:SMALL BOX head cap ...