Din 5480 Spline Dimensions Pdf ((better)) May 2026
DIN 5480 defines the standard for metric involute splines used in mechanical engineering.
Instead of traditional sizing based strictly on major and minor diameters, this standard utilizes a system based on reference diameters. This unique approach allows engineers to seamlessly match splined shafts and hubs to standard ball and roller bearing sizes. 📖 The Story of the Forgotten Zero
To understand how to read a DIN 5480 spline dimensions PDF, let’s look at a story every junior mechanical engineer experiences when first dealing with precision drivetrain design.
Imagine a young engineer tasked with replacing a high-torque gearbox shaft. The old blueprint has a cryptic callout: DIN 5480 W 120 x 3 x 38 x 8f.
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
. Confident, they model the part and send it to the machine shop.
A week later, the part returns. The engineer tries to press-fit a standard
ball bearing onto the new spline shaft. It gets completely stuck. Why?
The engineer fell into the classic DIN 5480 trap. In this standard, the number
does not equal the physical outer diameter. It is the Reference Diameter ( dBd sub cap B ). Because DIN 5480 utilizes a 30∘30 raised to the composed with power
pressure angle and profile displacement (shifting the teeth), the actual tip diameter of the shaft is modified to prevent interference with standard bearings. 🔍 How to Decode a DIN 5480 Callout
Whenever you look at a dimension table or drawing calling for DIN 5480, you can decode the string of numbers by breaking them down into five distinct parts:
W or N: Designates the part type. W stands for Welle (Shaft/External spline). N stands for Nabe (Hub/Internal spline). din 5480 spline dimensions pdf
120: The Reference Diameter. This is not the major or minor diameter, but rather the diameter that directly correlates with the matching bearing size. 3: The Module ( ). This determines the actual size of the spline teeth. 38: The Number of Teeth ( ).
8f: The Class of Fit. The number indicates the tolerance quality (tighter tolerances use lower numbers). The letter represents the positional deviation. In this specific case, 8f is a classic sliding/slip fit. 📐 Critical Dimension Formulas
When reading the PDF to calculate actual manufacturing dimensions, use these fundamental formulas: Pitch Diameter ( ): Base Circle ( ): Addendum ( ): Dedendum ( ):
Are you designing a sliding fit or a permanent interference fit for your spline project? DIN 5480 - Engineering.com
DIN 5480 is the German standard for involute splines based on reference diameters. Unlike other standards that use the pitch diameter as a starting point, DIN 5480 centers the design on the outside diameter of the shaft, making it easier to match with standard bearings and seals.
If you are looking for a DIN 5480 spline dimensions PDF, this article breaks down the essential geometry, calculation formulas, and tolerance classes you need to understand. The Logic of DIN 5480 Naming
The designation of a DIN 5480 spline follows a specific string of characters. Understanding this is key to reading any dimension table. Example: DIN 5480 - N 40 x 2 x 18 x 9H
N or W: "N" stands for a hub (internal), and "W" stands for a shaft (external). 40: The reference diameter ( 2: The module ( ), which determines the tooth size. 18: The number of teeth ( 9H: The tolerance class (standard fit). Core Geometry and Formulas
To calculate the dimensions found in a PDF table, you can use these fundamental formulas based on a 30° pressure angle. Reference Diameter ( ): Base Diameter ( ): Pitch ( ): Circular Tooth Thickness ( ): Key Dimension Table for Common Modules
The following values represent nominal dimensions before tolerances are applied. Reference Dia ( Number of Teeth ( Shaft Major Dia ( da1d sub a 1 end-sub Hub Minor Dia ( di2d sub i 2 end-sub Tolerance Classes and Fits
DIN 5480 uses a system of letters and numbers to define the "fit" between the shaft and hub.
Effective vs. Actual: The standard accounts for "effective" thickness, which includes deviations in lead, profile, and pitch. Standard Classes: DIN 5480 defines the standard for metric involute
9H/9g: The most common "sliding fit" for general engineering.
7H/7g: A precision fit for high-speed or high-torque applications. Position Letters: H: Standard for internal splines (hubs).
f, g, h: Common for external splines (shafts) to provide different levels of clearance. Measurement Between Pins (MDK/MDS)
Because you cannot easily measure the pitch diameter with a caliper, DIN 5480 dimensions PDFs focus on "Measurement Over Pins" for shafts and "Between Pins" for hubs. Shaft ( Macap M sub a
): Two pins are placed in opposite tooth spaces; the distance over the outside of the pins is measured. Hub ( Micap M sub i
): 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?
Self-Centering: The 30° pressure angle provides excellent centering under load.
High Strength: The involute curve reduces stress concentrations at the root.
Bearing Compatibility: Since it is based on reference diameters, the shaft ends often match standard metric ball bearing IDs perfectly.
💡 Tip: When downloading a PDF, ensure it specifies whether it covers the flat root or fillet root version, as this changes the root diameter and strength profile. AI responses may include mistakes. Learn more
DIN 5480 is the German standard for involute splines based on reference diameters. It is widely used in mechanical engineering for power transmission, particularly in automotive and industrial machinery. Key Characteristics Pressure Angle: Fixed at 30°. Module Range: Typically ranges from 0.5 to 10. Teeth Range: Standard covers 6 to 82 teeth.
Centering: Features side-fit centering, allowing for high load capacity and centering under torque. Understanding the Dimensions Standards & documents
When looking for specific values in a DIN 5480 PDF, the dimensions are calculated using these primary variables: Reference Diameter (
): The core diameter used for labeling (e.g., DIN 5480 N30). Module ( ): Determines the tooth size and spacing. Number of Teeth ( ): Defines the density of the spline. Pitch Diameter ( ): Calculated as
Major/Minor Diameters: Define the peaks and valleys of the teeth. Common Standard Tables
Most technical guides, such as the Doppler Gear Decoder or the eAssistant Handbook, provide tables for standard sizes. Standard Sizes (Examples) Number of Teeth ( N20 x 1.25 N30 x 2 N50 x 2 Design Considerations
Tolerances: Specified by "Tolerance Classes" (e.g., 9H for hubs, 7g for shafts).
Interchangeability: DIN 5480 is not interchangeable with ANSI B92.2M or ISO 4156.
Lubrication: Essential for reducing wear and ensuring smooth operation.
💡 Pro Tip: Always check the "N" (Hub) or "W" (Shaft) designation in your PDF to ensure you are looking at the correct part of the pairing. din 5480 spline dimensions
Standards & documents
- DIN 5480 is available as a PDF from standards providers; it includes full tables of dimensions (module vs. number of teeth), tolerances, and example drawings.
- For manufacturing and inspection, consult the official DIN 5480 document for exact numeric tables and tolerancing schemes.
DIN 5480 spline — concise overview
How to Calculate DIN 5480 Spline Dimensions
If you can’t find a PDF for your exact spline, use these formulas (for 30° side fit):
- Reference diameter = m × z
- Major dia external = m × (z + 1)
- Minor dia external = m × (z – 1.5)
- Form diameter (internal/external) – see DIN 5480-2 for exact limits
DIN 5480 Module Series (m)
The standard restricts modules to specific values to reduce tooling inventory:
0.5, 0.6, 0.8, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0
1. Understand DIN 5480
- Standard: DIN 5480-1:2006 or the latest version.
- Scope: This standard specifies the dimensions and tolerances for involute splines with a pressure angle of 30 degrees and a flat root.
DIN 5480 Spline Dimensions PDF – Complete Reference Guide
2. Engineering Reference Websites
- RotorClip, SDP/SI, and Grob Inc. offer summarized dimension tables (side fit, major diameter fit, minor diameter fit) in PDF format for free.
- Search for “DIN 5480 dimensions table PDF” on their resources pages.