The trend toward "exclusive" codes like DIN 509E06X02 is driven by (EU Registration, Evaluation, Authorisation and Restriction of Chemicals). As hexavalent chromium (Cr+6) becomes completely banned by 2024, platers are developing unique trivalent black and sealant combinations. These new chemistries cannot be covered by old DIN codes, hence the rise of the proprietary X -series.
Providing a 0.2 mm deep clearance pocket allows components like bearings, collars, gears, and bushings to slide into a definitive axial position without obstruction. This directly ensures predictable machine timing and spatial stack-up accuracy. din 509e06x02 exclusive