Do you need help for a custom machined part?
Short undercut for external threads (used when space is limited).
While Type A is the most searched, the DIN 76 standard includes several variations: din 76-a pdf
It allows the bolt head or nut to sit flush against the workpiece.
Are you trying to decide between and Type B (short) for a tight assembly? Do you need help for a custom machined part
It provides a "run-out" area for the thread-cutting tool.
In some modern contexts, ISO standards are superseding DIN, though DIN 76 remains the industry favorite in Europe. Are you trying to decide between and Type
Standard undercut for external threads (normal depth).
If the threads are rolled rather than cut, the undercut requirements might change. However, DIN 76-A remains the "gold standard" for general machining to ensure compatibility across different manufacturers. 3. Annotation on Drawings