DS EN 3303:1997 Aerospace Series - Screws, Cap Head, Hexagon Socket, 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 screws, cap head, hexagon socket, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated.