Din 5480 Spline Dimensions Pdf May 2026

This is the most critical fit dimension. DIN 5480 defines fits based on ISO tolerance systems (like 7H, 8f, 9e).

Instead of measuring the entire tooth, engineers measure over pins or balls (across rolls) or use span measurements ($W_k$). The standard provides tables listing the "Actual Space Width" ($E_max$ and $E_min$) and "Actual Tooth Thickness" ($S_max$ and $S_min$). din 5480 spline dimensions pdf

| Section | Description | |---------|-------------| | Basic formulas | Calculation of reference diameter, module, and profile shift | | Tooth geometry tables | Standardized combinations of module, teeth count, and diameters | | Tolerance classes | Fit classes for precise or general applications | | Inspection data | Over pin/ball measurements, span measurements over teeth | | Material allowances | Heat treatment and finishing allowances | This is the most critical fit dimension

For a given module, the reference diameter determines the number of teeth. Example for Module 2: The standard provides tables listing the "Actual Space

| d ref (mm) | Number of Teeth (z) | Major Diameter (dB) approx | | :--- | :--- | :--- | | 20 | 10 | 21.4 | | 25 | 12 | 26.6 | | 30 | 15 | 32.0 | | 38 | 19 | 40.4 | | 45 | 22 | 47.6 | | 50 | 25 | 53.0 | | 60 | 30 | 63.5 | | 75 | 38 | 79.0 |

(Note: Full PDF tables include values up to 500 mm reference diameter)