Din 509e06x02 Exclusive Access

"DIN 509 E 0.6 x 0.2"

The keyword refers to a highly specific mechanical engineering specification for a Type E relief groove (undercut) as defined by the German Institute for Standardization (DIN) . In precision manufacturing, these undercuts are essential for ensuring that mating parts—such as a shaft and a bearing—can fit perfectly against a shoulder without interference from the naturally occurring radius left by a cutting tool.

The Stress Reliever

: Without this specific curvature, a sharp corner on a rotating shaft becomes a "stress riser." Under heavy loads, cracks begin at these sharp points. The Type E 0.6mm radius acts like a smooth highway for mechanical stress, allowing forces to flow around the corner instead of snapping the metal. din 509e06x02 exclusive

Used on turned shafts or in bores to allow grinding tools or mating parts to reach the corner. Usage Context Din 509-Relief Grooves | PDF | Machining - Scribd "DIN 509 E 0

Here is an analysis of the topic to help you identify the "piece" in question: The Type E 0

If you are writing a specification or manufacturing to this old code: