DS EN 4074:2009 Aerospace Series - Screws, Pan Head, Six Lobe Recess, Coarse Tolerance Normal Shank, Medium Length Thread, In Titanium Alloy, Aluminium Ivd Coated - Classification: 1100 Mpa (At Ambient Temperature)/425 Degree C Defines the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated.