DIN 5480 utilizes the standard ISO deviation system (letters and numbers) to control the fit between the shaft and hub flanks. This dictates whether the assembly will be a clearance fit, transition fit, or interference fit.

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The engineer quickly searches for a digital PDF of the standard, scrolls to the tables, and measures the old shaft's major diameter with a caliper. It reads exactly

Features side-fit centering, allowing for high load capacity and centering under torque. Understanding the Dimensions

: Ensure easy axial movement without load (e.g., 9H/9g).

indicates an Internal Spline (Hub/Bore). W indicates an External Spline (Shaft). 120 Reference Diameter ( The nominal dimension around which the spline is designed ( 3 The pitch module, which dictates tooth size ( 38 Number of Teeth ( The total count of splines around the circumference ( 9H or 8f Tolerance Class

The DIN 5480 series applies to splines within the following ranges: 0.5 to 10 Number of Teeth ( ): 6 to 82 Pressure Angle: Strictly 30° How to Read a DIN 5480 Designation

Used to adapt the teeth to a specific reference diameter while keeping the rack profile consistent across all pitches. Structure of the DIN 5480 Series

If you are modeling these components in CAD software (such as SolidWorks, Autodesk Inventor, or PTC Creo), look for built-in "Design Accelerator" modules that automatically calculate these values using the exact formulas outlined above.

A good should include tables structured by the reference diameter. The data usually follows this format: Description Reference Diameter The base diameter (e.g., 20, 25, 30 mm). Module Typically 0.5, 0.8, 1, 1.25, 1.5, 1.75, 2, 2.5, 3, etc.. Number of Teeth Varies based on the diameter. Base Diameter The circle from which the involute is generated. Major Diameter The outer diameter of the spline. Minor Diameter The inner diameter of the spline. Measurement Pin Diameter Dmcap D sub m The diameter of the pins used for measurement. Measurement Between Pins Micap M sub i Dimension for internal splines. Measurement Over Pins Macap M sub a Dimension for external splines. Finding a Reliable DIN 5480 PDF

Designated with lowercase letters (e.g., 7h , 8g , 8f ). An f or g tolerance produces a loose, free-sliding fit.

Here is a glimpse of how the dimensions are structured (example for Module 2): 20 mm Module: 2 Teeth (z): 9 Major Diameter: 22 mm Minor Diameter: 15.5 mm Reference Diameter: 30 mm Module: 2 Teeth (z): 14 Major Diameter: 32 mm Minor Diameter: 25.5 mm Conclusion

: A precision fit for high-speed or high-torque applications. Position Letters : H : Standard for internal splines (hubs).

The tooth profile is an involute curve, allowing for high torque capacity and high meshing accuracy, which is essential for high-speed transmission machinery.

The following formulas are used to calculate critical dimensions for both shafts (external) and hubs (internal): Engineering.com Reference Diameter ( Pitch Diameter Base Circle Diameter ( Addendum ( Dedendum ( Tooth Depth ( Standard Designation Example A typical specification follows this format: DIN 5480 W 120 x 3 x 38 x 8f : Indicates a shaft ("Welle") or a hub ("Nabe"). : Reference diameter. : Module ( : Number of teeth ( : Tolerance class and fit. Available Documentation

Below is a typical lookup format (for 30° pressure angle, flat root side fit):

Do you need assistance calculating the for a specific fit class?

) : Two pins are placed in opposite spaces; the distance between the inside of the pins is measured. The diameter of the measuring pin ( Decap D sub e ) is typically for most standard DIN 5480 calculations. Why Use DIN 5480 Over Other Standards?

: Since it is based on reference diameters, the shaft ends often match standard metric ball bearing IDs perfectly.

| Module (m) | Number of teeth (z) | Pitch diameter (d) | Tooth thickness (s) | | --- | --- | --- | --- | | 1 | 10 | 10 mm | 1.57 mm | | 1.5 | 12 | 18 mm | 2.36 mm | | 2 | 16 | 32 mm | 3.14 mm |