In some modern contexts, ISO standards are superseding DIN, though DIN 76 remains the industry favorite in Europe.

Properly rounded undercuts reduce the "notch effect," which prevents stress fractures at the weakest point of a fastener. Flush Assembly:

DIN 76-1 categorizes external thread undercuts into different forms based on application requirements:

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.

Typically applied to internal (female) thread undercuts. Looking for a DIN 76-A PDF?

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