... -corrosion(ISO 9001 2008). We can produce high quality bolt and nut per customer's requirements. The feature of ... , GB, ANSI and BS certificate: ROHS,ISO,SGSMaterials: stainless steel, carbon steel, coppersurface treatment: zinc plated, passivation, dacroblack,size: M6,M8 ... to requirement Specifications1.material:carbon/stainless steel 2.size:M6-M20 3.Length:50-300mm 4.galvanized,QPQ,Passivate 5.ROHS, ...