Electroplated coating, 6 µm thickness, single layer (likely zinc), with type 2 chromate passivation (blue-bright).
The specification refers to a standardized Type E relief groove (undercut) with a radius of 0.6 mm and a depth of 0.2 mm , primarily used in precision machining to ensure proper fitment and stress distribution in cylindrical parts. This specific configuration is "exclusive" to components that require a single machining surface, typically where a cylindrical shaft meets a flat shoulder but the shoulder itself does not undergo further finishing. Technical Breakdown of DIN 509 E0.6x0.2 din 509e06x02 exclusive