When creating 2D production drawings in compliance with ISO or DIN standards, you do not need to manually detail every dimension of the undercut. Instead, use a standardized simplified callout note pointing to the groove:
Among these three, is by far the most frequently used, and it is the one that contains Form A (DIN 76‑A) and Form B for external threads, as well as Form C and Form D for internal threads. The current version of DIN 76‑1 was published in August 2016 (DIN 76‑1:2016‑08) and supersedes all earlier editions going back to 1924.
When creating 2D production drawings in compliance with ISO or DIN standards, you do not need to manually detail every dimension of the undercut. Instead, use a standardized simplified callout note pointing to the groove:
Among these three, is by far the most frequently used, and it is the one that contains Form A (DIN 76‑A) and Form B for external threads, as well as Form C and Form D for internal threads. The current version of DIN 76‑1 was published in August 2016 (DIN 76‑1:2016‑08) and supersedes all earlier editions going back to 1924. din 76-a pdf
