DS EN 4129:2009 Aerospace Series - Bolts, Normal Hexagonal Head, Coarse Tolerance Normal Shank, Medium Length Thread, In Alloy Steel, Cadmium Plated - Classification: 1100 Mpa (At Ambient Temperature)/235 Degree C Defines the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated.