is the German standard that specifies the dimensions for thread run-outs and thread undercuts specifically for ISO metric threads (coarse and fine pitch).
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DIN standards are and not freely available. Legal sources: din 76-a pdf
Properly rounded undercuts reduce the "notch effect," which prevents stress fractures at the weakest point of a fastener. Flush Assembly: DIN 76-1 is the German standard that specifies
(undercut depth and width) for a particular thread size like AI responses may include mistakes. Learn more Din 76-1 | PDF | Screw | Metalworking - Scribd din 76-a pdf