... 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 available2) Can be made with ... your reference.Welcome customerized drawings. Hexagon head bolts