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Most free PDFs floating on personal servers contain rounding errors (especially for "d_ee" and "d_ii" tolerances). For a verified source:

The DIN 5480 standard is the definitive German Industrial Standard for . Unlike the ISO 14 standard which covers straight-sided splines, DIN 5480 utilizes an involute tooth form (similar to gears) which provides superior centering, high load capacity, and ease of measurement.

Identifies if it’s an external (W) or internal (N) spline. 120: Reference Diameter ( ) in millimeters. 3: Module ( 38: Number of Teeth ( 8f: Tolerance Class (specifies fit accuracy). Verified DIN 5480 Spline Dimensions