DS EN 4312:2006 Aerospace Series - Studs, Coarse Tolerance Reduced Shank, Medium Length Thread, In Heat And Corrosion Resisting Steel, With Aluminium Pigmented Coating - Classification: 1100 Mpa (At Ambient Temperature)/315 Degree C Defines the characteristics of studs, close tolerance shank, medium length thread, in heat and corrosion resisting steel, with aluminium pigmented coating.