TS EN ISO 3098-1

TS EN ISO 3098-1 is the standard that sets out the general rules for lettering used in technical product documentation, especially on technical drawings. In the context of the ISO 3098 series, it provides the common framework for producing lettering that is legible, consistent and suitable for engineering use.

Why lettering matters in technical drawings

In technical documentation, lettering carries critical information such as dimensions, notes, material references, identifiers and instructions. The emphasis is not decorative style but reliable communication: character size, proportion, spacing, slant and layout all affect how clearly the information can be read and interpreted. As general technical practice, standardized lettering helps different users read the same drawing in the same way, reducing ambiguity across teams and disciplines.

What this part covers in general terms

This part specifies the general requirements for lettering and its application in line with the other parts of ISO 3098. It focuses on the overarching conventions for use in technical product documentation rather than on one isolated character form or one single application method. In practical terms, it provides the basic lettering rules that support a uniform appearance across drawings and related documents, while the more specific parts of the series address other lettering details or techniques.

• Focuses on lettering intended for technical product documentation and technical drawings.
• Provides general requirements to be used together with the other parts of ISO 3098.
• Supports legibility, consistency and unambiguous communication in engineering documents.
• Establishes a common lettering framework rather than a decorative writing style.