Din 509-e0.6x0.2 — Legit

: The German industrial standard for "Undercuts — Types and Dimensions".

The designation refers to a specific type of undercut (also known as a relief groove) used in mechanical engineering and precision machining. Standardized by the German Institute for Standardization (DIN) , this specification ensures that cylindrical parts, such as shafts and spindles, have the necessary clearance for subsequent machining or assembly. Decoding the Specification: E 0.6 x 0.2 Din 509-e0.6x0.2