Din 5480 Pdf [2021] Page

For external spline, measure over two pins of diameter d(_P) = 1.8×m (for m ≥ 2). The measurement M(_R) = d(_B) × cos α / cos α(_M) + d(_P), where α(_M) is involute function.

Many CNC milling spindles have internal DIN 5480 splines to drive tool holders or drawbars. Din 5480 Pdf

❌ Stating both dref and z incorrectly – e.g., W 50 x 2.5 x 22 – 50/2.5 = 20 teeth, not 22. The tooth count is mathematically fixed. For external spline, measure over two pins of

– Provides specific data for modules ranging from 0.5 to 10 mm and tooth counts from 6 to 82. For external spline

– Covers inspection methods for fitted splined connections.