TS EN ISO 6413

TS EN ISO 6413 is a drafting standard for how splines and serrations are represented on technical drawings. Its focus is not on redesigning the part geometry itself, but on giving engineers and drafters a consistent visual language for showing these specific shaft-and-hub features. In mechanical drawings, clear representation helps avoid ambiguity in manufacture, inspection, and assembly.

Why spline and serration representation matters

In general technical terms, splines are longitudinal forms used to transmit torque between a shaft and a mating component through multiple engaged teeth or lobes. Serrations are related profile forms, often used where compact, accurate engagement is needed; the term triangular spline shaft points to a specific profile family. If these features are not distinguished clearly on a drawing, the interpretation of fit, profile form, and production method can vary. The value of a representation standard is that it reduces clutter while preserving the information needed to read the feature correctly.

What this standard covers

According to its scope, the standard covers the rules and graphical symbols used to represent these features on technical drawings. In practical drafting terms, that means it addresses how the symbols are applied and how these profiles are communicated visually, rather than the full design of the component. Such standards support consistent drafting practice across drawings and organizations. This listing corresponds to the withdrawn TSE edition based on EN ISO 6413:1994.

• Clear drawing representation of splines and serrations
• Common graphical symbols and drafting rules
• Consistent interpretation in manufacturing and inspection
• Concise communication of special profile geometry on engineering drawings