TS EN ISO 6413

TS EN ISO 6413 sets out how splines and serrations are represented in technical product documentation. This is important wherever machine components use profiled engagement features and those features must be shown clearly, consistently and without ambiguity on drawings. The standard focuses on the graphical representation of these geometries and the symbols used to express them.

Representation methods and their drafting purpose

The standard specifies two ways to present these features: complete representation and simplified representation. In general technical terms, a complete representation conveys the profile and related geometric detail in greater depth, while a simplified representation reduces visual complexity and keeps the drawing easier to read. The choice of method depends on the purpose of the document, the scale of the drawing and the level of detail needed to communicate the feature correctly. This distinction helps different drawings of the same part remain consistent and intelligible.

Why splines and serrations matter in engineering drawings

Splines and serrations are profiled connection features used in shaft-and-hub interfaces for torque transmission, positioning and mating accuracy. In general mechanical practice, they serve a function similar to other power-transmission features, but their geometry and drafting needs are distinct. The value of this standard is that it supports uniform notation for these special profiles, reducing ambiguity in design communication, manufacturing, inspection and assembly.

• Provides rules and graphical symbols for representing splines and serrations in technical product documentation.
• Defines two representation approaches: complete representation and simplified representation.
• Supports clearer and more consistent communication in machine engineering drawings.
• Helps standardise how profiled shaft-and-hub features are interpreted.