DS EN 4163:2009 Aerospace Series - Screws 100 Degree Countersunk Normal Head, Offset Cruciform Recess, Coarse Tolerance Normal Shank, Long Thread, In Alloy Steel, Cadmium Plated - 1100 Mpa (At Ambient Temperature)/235 Degree C Defines the characteristics of screws, 100 degree countersunk normal head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated.