DS EN 2888:2006 Aerospace Series - Metric Bolts, Normal Hexagon Head, Coarse Tolerance Normal Shank, Short Thread, In Corrosion Resisting Steel, Passivated - Classification: 600 Mpa (At Ambient Temperature)/425 Degree C Defines the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, short thread, in corrosion resisting steel, passivated.