DS EN 4135:2009 Aerospace Series - Bolts, Normal Bi-Hexagonal Head, Coarse Tolerance Normal Shank, Medium Length Thread, In Titanium Alloy, Anodized, Mos[2] Lubricated - Classification: 1100 Mpa (At Ambient Temperature)/315 Degree C Defines the characteristics of bolts, normal bi-hexagonal head, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS[2] lubricated.