DS EN 4311:2006 Aerospace Series - Studs, Coarse Tolerance Reduced Shank, Medium Length Threads, In Heat And Corrosion Resisting Steel, Mos[2] Lubricated - Classification: 1100 Mpa (At Ambient Temperature)/315 Degree C Defines the characteristics of studs, coarse tolerance reduced shank, medium length threads, in heat and corrosion resisting steel, MoS[2] lubricated.