TS EN ISO 129-1
Technical product documentation (TPD) - Presentation of dimensions and tolerances - Part 1: General principles
This document establishes the general principles for presentation of dimensions and associated
tolerances that apply to 2D technical drawings in all disciplines and trades but which can also be
applied to 3D applications.
This document does not cover the application of dimensional tolerances and their meaning. See
ISO 14405-1 for tolerancing principles. This document can only be used to describe the nominal model
of a drawing, not the non-ideal surface model (skin model) used for tolerancing purposes (for more
information on tolerancing specifications, see the list of GPS standards listed as normative reference or
as bibliography)
Considering the ISO 14405 series, the presentation of tolerance indication is unambiguous when it is
applied to a dimension which is a size and ambiguous when the dimension is not a size.
All rules presented in this document are available for any type of drawing (see ISO 29845).
In addition, this document introduces the concept of property indicators, developed length, between,
surface indicators, flag notes and textual instructions.
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About This Item
TS EN ISO 129-1 defines the general principles for presenting dimensions and associated tolerances in technical product documentation. Its purpose is to provide a consistent visual language for technical drawings, so that dimensions, annotations and symbols can be read in the same way across disciplines and trades. The standard is aimed at the presentation of 2D technical drawings, while its principles can also be applied to 3D applications. As a general presentation standard, it does not by itself define the engineering meaning or application of dimensional tolerances.
Where dimension presentation ends and tolerancing begins
In technical drawing, the way a dimension is shown is not the same as the way its tolerance is interpreted. This standard focuses on the clear presentation of nominal dimensions, while tolerancing principles and the meaning of dimensional tolerances belong to related GPS standards such as ISO 14405-1. That distinction matters because the unambiguity of a tolerance indication depends on whether the dimension represents a size or a non-size characteristic. In practice, this helps drawings communicate design intent without mixing notation rules with tolerancing rules.
Additional notation concepts used in drawings
The document also introduces concepts such as property indicators, developed length, between, surface indicators, flag notes and textual instructions. In general technical terms, these devices help specify which feature, surface or region of a part is being addressed when a simple numerical dimension is not enough. They are especially useful in complex products, where clarity depends on linking the number on the drawing to the exact geometry or condition being described. The rules apply to any type of drawing as referenced by ISO 29845, supporting a common presentation discipline across different drawing practices.
Overall, this standard is about the presentation layer of technical documentation: how dimensions and related notes are shown, not how all tolerances are calculated or assigned. It is therefore best understood as a foundational drawing language standard that works alongside the broader GPS tolerancing framework.
- Publication Date: 16.12.2019
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 01.100.01 Teknik Resim (Genel)
- Pages: 82
- Source Standard: EN ISO 129-1:2019
- International Equivalents: EN ISO 129-1-EQV; ISO 129-1-EQV
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