The curved flank profile distributes stresses evenly, reducing the risk of fatigue failure.

Here is a breakdown using the example :

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When looking at a DIN 5480 specification, you will see a designation string like this: DIN 5480 – N 40 x 2 x 18 x 9H : Indicates an internal spline (Hub). Use for an external spline (Shaft). : Reference diameter ( : Module ( ), which defines the tooth size. : Number of teeth ( : Tolerance class (9) and position (H). 4. Design Parameters The standard uses a 30° pressure angle . The relationship between the key dimensions is: Reference Diameter: 5. Where to Find Official PDF Copies

Under load, the forces naturally center the hub onto the shaft, minimizing runout.

is a German standard for involute splines based on reference diameters. These splines are essential mechanical components used to connect shafts and hubs, allowing for high torque transmission while maintaining precise alignment.

pressure angle. However, the exact calculation of tolerances and specific tooth heights vary slightly, meaning parts designed under ISO 4156 and DIN 5480 are universally interchangeable. Summary for Designers