. This standard defines the geometry of undercuts used to provide clearance for subsequent machining or assembly on turned parts and in bores. Technical Breakdown

Let's decode it step by step according to the DIN 509 standard (Electrodeposited coatings):

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: Choose this form when the shoulder does not face high alternating loads and you primarily need to ensure the tool has enough room to finish the cylindrical section without hitting a sharp corner.

: In technical drawings, you can represent this either in full detail with all dimensions or as a simplified callout: Undercut DIN 509 – E 0.6 x 0.2 Grinding Allowances