: Using these exact dimensions reduces the variety of tools needed in a workshop, as specified in the DIN 509:2006-12 technical documentation . Visualizing the Undercut
While "exclusive" is not a formal part of the DIN 509 nomenclature, in a commercial or technical context, it typically implies a part manufactured to these exact tolerances for a specific high-end application or a proprietary product line. Technical Breakdown of DIN 509 E 0.6 x 0.2 din 509e06x02 exclusive