DS EN 2859:2006 Aerospace Series - Bolts, Normal Hexagonal Head, Close Tolerance Normal Shank, Short Thread, In Alloy Steel, Cadmium Plated, Metric Series - Classification: 1100 Mpa (At Ambient Temperature)/235 Degree C Defines the characteristics of bolts, normal hexagonal head, close tolerance normal shank, short thread, in alloy steel, cadmium plated, metric series.