DIN 5463 (technically succeeded by ISO 14) specifies the dimensions and tolerances for metric parallel-sided spline shaft connections. These splines are primarily used for transmitting torque and allowing axial movement between a shaft and its mating component, such as a bushing or gear. 1. Technical Specifications Overview
Tooth Profile: Straight, parallel flanks where the flank of each key is parallel to the inside diameter. din 5463 pdf
Thus, if you design a new component using the old DIN 5463 PDF, you may be creating a legacy part that does not conform to modern ISO requirements. DIN 5463 (technically succeeded by ISO 14 )