If you are looking for the actual PDF documentation or detailed tables, you can find them on various technical hosting sites:
On a typical engineering drawing, you might see a note like: din 76-a pdf
DIN 76-1 is a German (DIN) standard that defines the (the transition area between a full thread and a plain shaft) and thread undercuts (relief grooves) for metric ISO threads as specified in DIN 13 (e.g., M series threads). If you are looking for the actual PDF