Because DIN 933 bolts are fully threaded, the "thread run-out" (the transition point between the incomplete threads and the head) is a critical measurement. If the thread runs too close to the fillet (the radius under the head), it can create a stress concentration point, leading to fatigue failure.
If you only need (not the full standard), many engineering handbooks and fastener supplier websites (e.g., Würth, Bossard, McMaster-Carr) publish the key tables for free and legally. din 933 pdfcoffee