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Typically designated with capital letters (e.g., 7H, 9H).
DIN 5480 – W 120×3×38×8fDIN 5480 – W 120 cross 3 cross 38 cross 8 f Here is how to decode this designation: The governing standard.
: As explicitly stated in the DIN standard and by experts, "Spline teeth according to ANSI B92.2M and ISO 4156 are not interchangeable with splines described in the DIN 5480 series of standards". The tooth root fillet designs, tolerance calculations, and fit systems are fundamentally different, meaning a part made to one standard will not fit correctly with a part made to the other.
Note: The actual manufactured values will vary slightly based on the selected tolerance classes and the machining allowance required for specific fit types (interference, transition, or clearance). Understanding DIN 5480 Designations
When reviewing engineering drawings, DIN 5480 splines are specified using a standardized alphanumeric string. Deciphering this code is essential for manufacturing. DIN 5480 – W 120 x 3 x 38 x 8f Breaking down the code: DIN 5480: The governing standard. Din 5480 Pdf
The standard officially replaced older spline standards in the 1980s and has since been harmonized with international standards like ISO 4156 (though specific differences remain).
| Class | Fit Type | | :--- | :--- | | | Sliding / Clearance fits | | h / H | Line-on-line fit (standard) | | j–v / J–M | Interference / Press fits |
: Primarily uses flank centering , though diameter centering is allowed in exceptional cases.
: Often specified using classes like 9H (for hubs) or 8f (for shafts). Resources and Reference Tables Typically designated with capital letters (e
Selecting the right fit depends on the application. For instance, an fit provides a loose, sliding clearance ideal for parts that need to be assembled easily by hand, while a 7h fit offers tight, high-precision alignment minimalizing backlash in reversing drives. Inspection and Measurement: Measuring Over Pins
DIN 5480 is a widely used standard for involute splines, which defines the dimensions, tolerances, and testing methods for these components. The standard specifies several quality classes, which differ in their dimensional tolerances and testing requirements. If you're looking for a PDF version of DIN 5480, you can try the resources listed above.
): Precision pins of a specific diameter are placed into opposite tooth spaces. The distance over the pins (for external splines) or between the pins (for internal splines) is measured using a micrometer. The DIN 5480 PDF tables provide the exact pin diameters and target dimensions for each tooth configuration.
If you are replacing a shaft or hub in a German-made machine (from brands like Bosch Rexroth, ZF, or Siemens), chances are high that the spline was cut to DIN 5480 specifications. The tooth root fillet designs, tolerance calculations, and
If you are designing a new mechanical system, always refer to an official, updated copy of the data tables to extract the precise tolerance limits and pin measurement values required for your specific application.
DIN 5480 is a German Institute for Standardization (Deutsches Institut für Normung) standard that defines based on reference diameters. Unlike older systems (like DIN 5462 or DIN 5463) which used a straight-sided tooth profile, DIN 5480 uses an involute profile.
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.
The tooth shape distributes stress evenly, reducing stress concentrations.
The key aspects of splined connections include:
Exact tip and root diameters taking tool clearance fillets into account. Form diameters ( df1d sub f 1 end-sub df2d sub f 2 end-sub