... ,Rohs certification 4.material: stainless steel,carbon steel grade 12.9 mild steel hexagonal socket head cap screw 1)Standard of ... steel 35#,stainless steel, brass Grade: 8.8,10.9,12.9,SAE J429 GR.5/GR.8 4.Surface of screw ... .6.we have passed ISO 9001:2008 certification grade 12.9 mild steel hexagonal socket head cap screw