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is a technical standard from the German Institute for Standardization (DIN) that specifies dimensions for thread run-outs thread undercuts
Remember: The depth of the undercut must be slightly deeper than the thread root diameter. din 76-a pdf
If you are looking for the actual PDF documentation or detailed tables, you can find them on various technical hosting sites: is a technical standard from the German Institute
Once you have your , here is how a CNC machinist or lathe operator applies it: If you are looking for the actual PDF
This report provides an overview of (the latest version), which specifies dimensions and types of thread run-outs and thread undercuts for metric ISO threads according to DIN 13-1. The goal is to ensure safe, standardized relief of thread ends in machined parts.
DIN 76-1 is a German (DIN) standard that defines the (the transition area between a full thread and a plain shaft) and thread undercuts (relief grooves) for metric ISO threads as specified in DIN 13 (e.g., M series threads).
Generally, the undercut width is approximately three times the thread pitch (
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