Din 5480 Spline Dimensions Pdf [2025]
Warning: Many free PDFs online are scanned copies of outdated versions (pre-2005) or contain OCR errors in the dimension tables.
If you download a PDF of DIN 5480 Part 1 (Generalities) or Part 2 (Dimensions), you will find tables structured by Nominal Diameter and Module
| Symbol | Meaning | Description | | :--- | :--- | :--- | | d ref | Reference diameter | = m * z | | d B | Major diameter | Outer diameter of external spline | | d b | Minor diameter | Inner diameter of external spline | | d a | Root diameter | Internal spline minor diameter | | p | Circular pitch | = π * m | | α | Pressure angle | 30° or 37.5° |
If you work in mechanical engineering, automotive drivetrain design, or precision machining, you’ve likely encountered the DIN 5480 standard. It is the go-to specification for involute splines based on reference diameters, used heavily in Germany and across Europe. din 5480 spline dimensions pdf
But finding a clear, downloadable PDF that lists all the dimensions? That can be a headache.
In this post, we break down everything you need to know about DIN 5480 spline dimensions and point you toward a reliable reference.
Design Request: A shaft requires an external spline DIN 5480 Z 85 x 3 x 28 x 9H. Warning: Many free PDFs online are scanned copies
From the PDF (Module 3 table):
Inspection data from PDF:
For a given module, the reference diameter determines the number of teeth. Example for Module 2: Inspection data from PDF: For a given module,
| 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)
This is the theoretical diameter where the tooth thickness equals the space width. $$d = m \times z$$
DIN 5480 specifies tolerance classes (e.g., h, js) and flank clearance to control backlash and load distribution. Fits range from sliding (clearance) to interference types for press fits. The standard includes permissible deviations for flank form, lead, and runout.