DS EN 4161:2009 Aerospace Series - Screws, Pan Head, Offset Cruciform Recess, Coarse Tolerance Normal Shank, Long Thread, In Alloy Steel, Cadmium Plated - Classification: 1100 Pma (At Ambient Temperature)/235 Degree C Defines the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated.