TS EN ISO 128-2

TS EN ISO 128-2 is part of the general principles for technical product documentation and focuses on how lines are defined and used in technical representation. In technical drawings, diagrams, plans and maps, the line language is essential for distinguishing visible edges, hidden details, axes, dimensions and explanatory references in a clear and consistent way.

Line types and their technical meaning

This part addresses the types of lines used in technical drawings, their designations and the basic rules for drafting them. In general technical practice, line thickness, continuity, dash patterns and junctions help separate geometry, positional information and annotation from one another. Consistent line use reduces the risk of misreading a drawing during design, checking, manufacture and communication.

Leader lines, reference lines and application notes

The standard also specifies general rules for leader lines and reference lines, together with the placement of instructions or notes on or near those lines. This makes it possible to link a note, callout or reference unambiguously to the intended feature. Annexes provide specific information for mechanical, construction and shipbuilding technical drawings, showing how the same line conventions are adapted across different engineering disciplines.

In the broad sense used here, “technical drawing” means more than a single sheet: it covers the complete documentation package that defines a product, including a workpiece, subassembly or assembly. The subject is therefore not only graphic appearance, but the consistent and readable communication of technical information.