TS 88-24 ISO 128-24

TS 88-24 ISO 128-24 is part of the ISO 128 series and addresses the general presentation rules for line types used on mechanical engineering drawings. It provides a basic framework for understanding how linework functions as a technical language, where distinctions between visible edges, hidden details, axes, dimension aids and other line functions matter to the clarity of the drawing.

The role of line language in mechanical drawings

In technical drawing, a line is not just a contour; it is a notation that conveys geometry, position and drawing intent. In mechanical engineering drawings, the coordinated use of different line types helps ensure that drawings can be read correctly during design, manufacture and inspection. This standard therefore covers the general and basic rules for line types, supporting that shared readability.

In general technical practice, line types are distinguished by properties such as thickness, continuity, dash pattern and purpose. These distinctions help separate a visible boundary from a concealed feature or a centreline used as a symmetry reference. As part of ISO 128, this document should be understood as a foundational reference to be used together with related drafting and presentation rules.

• Covers the general and basic rules for line types on mechanical engineering drawings.
• Supports functional distinction and visual consistency in technical communication.
• Is a line-presentation section within the ISO 128 family.
• Helps separate different kinds of information on the same drawing in a controlled way.