... : stainless steel,carbon steel hex head cap screws-bolts grade 8 fine thread in hardware 1)Standard of screw: DIN95/96 ... screw: alloy steel, carbon steel 35#,stainless steel, brass Grade: 8.8,10.9,12.9,SAE J429 GR.5/GR ... .8 4.Surface of screw: Black, Zinc Cr+3, Yellow Zinc ... ISO 9001:2008 certification hex head cap screws-bolts grade 8 fine thread in hardware