is a specific section of the German institute for standardization (Deutsches Institut für Normung) standard DIN 76-1 . This standard defines the dimensions and geometry for thread run-outs and thread undercuts for ISO metric screw threads.
) if space permits, as it allows for easier machining and better tool clearance. Use the short width ( ) only when axial space is highly restricted. Finding a DIN 76-A PDF
During machining (like on a lathe), the tool needs space to exit the thread profile without hitting a shoulder. din 76-a pdf
(Radius): The curvature radius at the bottom of the groove to prevent stress fractures. DIN 76-1 Form A Dimension Table
When looking for an official , it is important to note that the document is officially titled DIN 76-1 ("Tapping holes, thread run-outs and thread undercuts for ISO metric threads"). Tips for Sourcing the Document: is a specific section of the German institute
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.
Purchase the official, current version of DIN 76-1 from Beuth Verlag (the official publisher of DIN standards) or IHS Markit. Use the short width ( ) only when
⚠️ Avoid illegal PDF-sharing sites; they often have outdated or scanned copies with errors.
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