Hex Flange Nuts 1.Materials:Carbon Steel 2.Diameter:M5~M20 3.Grade:4~8 4.Standard:DIN6923 Hex Flange NutsHigh quality and Best price1.Materials:Carbon Steel2.Diameter:M5~M203.Grade:4~84.Standard:DIN69235.Packing:Bulk or Small Box,According to customer requirement6.Surface Treatment :Zinc,Black Phosphate,Grey,Nickel,Etc DIN6923 Hex Flange Nuts