... Hexagon head bolts DIN931 Size:M1.6-M39 Grade: 8.8S,10.9S,12.9S Finish:Passivated,Black Oxide,Zinc,Dacromet etc Hexagon head bolts ... DIN931Material:Stainless Steel,Carbon Steel,Alloy Steel1) Various kinds of bolts are are ... strength, such as 8.8s,10.9s3) Can be supplied with different finish, such as bright, zinc plated, black4) Can be ...