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Short thread relief for external threads. These are used when space is limited, such as in compact assemblies. Form C: Long thread relief for internal threads. Form D: Short thread relief for internal threads. Why Do You Need a Thread Undercut?

In practice, when you use a modern CAD program or CNC cycle, you may see an option for a "DIN 76" undercut, which typically covers both Form A (for metric threads) and Form G for specialized cases. The software will then automatically calculate the correct dimensions based on the thread pitch you provide. din 76a pdf

This normal‑length design strikes a practical balance: it is long enough to allow the thread to be fully formed using standard cutting tools without requiring special tooling, yet short enough to preserve material and minimize stress concentration in most applications. Wherever possible, Form A should be the engineer's first choice. Short thread relief for external threads

Understanding the DIN 76 Standard for Thread Run-Outs and Undercuts Form D: Short thread relief for internal threads