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BS EN ISO 129-1:2019+A1:2021

BS EN ISO 129-1:2019+A1:2021

$215.11

Technical product documentation (TPD). Presentation of dimensions and tolerances – General principles

Published By Publication Date Number of Pages
BSI 2021 76
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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.

NOTE 1 All figures are shown in 2D views only.

NOTE 2 Additional information and details for construction engineering are given in ISO 6284.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
Anchor 2
Foreword to amendment A1
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
3.1 Elements of dimensioning
3.2 Dimensions
11 4 Presentation of dimensions
4.1 Presentation rules
4.1.1 Dimensions
4.1.2 Repeated dimensions
4.1.3 Out of scale dimensions
4.1.4 Auxiliary dimensions
4.1.5 Theoretically exact dimensions
12 4.1.6 Symmetrical dimensions
4.1.7 Characters and presentation
4.2 Positioning of dimensions
14 4.3 Units of dimensions
5 Elements of dimensioning — Usage
5.1 General
15 5.2 Property indicators
16 5.3 Dimension line
19 5.4 Terminators and origin presentation
5.4.1 Terminators
20 5.4.2 Origin presentation
5.5 Extension line
24 5.6 Leader line
5.7 Dimensional values
5.7.1 Presentation
5.7.2 Placement of dimensional values and symbols
26 5.7.3 Special placement of dimensional values and symbols
28 5.8 Alpha numerical characters and symbols representing dimensional values
5.8.1 Alpha numerical characters representing dimensional values
5.8.2 Symbols added to dimensional values
5.9 Tabular dimensioning
29 5.10 Complementary indication
6 Presentation of dimensional tolerances
6.1 General
6.2 Limit deviations
31 6.3 Limit dimensioning
7 Presentation of special dimensions
7.1 Arrangement of graphical and letter symbols with dimensional values
33 7.2 Diameters
34 7.3 Radii
7.3.1 General
35 7.3.2 Dimension location of radius centre
36 7.3.3 Semicircle features
7.3.4 Combined radii presentation
7.4 Spheres
37 7.5 Between
7.6 Arcs, chords and angles
39 7.7 Squares
40 7.8 Equally spaced and repeated features
7.8.1 Equally spaced features
42 7.8.2 Repeated features
43 7.8.3 Tabulated repeated features
44 7.9 Symmetrical workpieces and views
46 7.10 Presentation of levels
47 7.11 Dimensions of out-of-scale represented features
7.12 Auxiliary dimensions
7.13 Theoretical exact dimensions
7.14 Dimensioning of curved features
7.14.1 Curved features defined by radii
48 7.14.2 Curved features defined by coordinate dimensions
50 7.15 Dimensioning of developed views
7.16 Dimensioning of thin parts
7.16.1 Thickness indication
51 7.16.2 Surface indication
52 7.17 Dimensioning of restricted areas
7.17.1 General Rules
7.17.2 Dimensioning of restricted areas on surfaces of revolution
53 7.17.3 Dimensioning of restricted areas on other than surfaces of revolution
54 8 Arrangements of dimensions
8.1 General
8.2 Chain dimensioning
8.3 Parallel dimensioning
55 8.4 Running dimensioning
8.4.1 General
8.4.2 Unidirectional and bidirectional running dimensions
59 8.5 Coordinate dimensioning
8.5.1 Cartesian coordinate dimensioning
61 8.5.2 Polar coordinate dimensioning
8.6 Combined dimensioning
63 9 Notes and special notations
9.1 Flag notes
65 9.2 Indication of textual instructions
67 Annex A (normative) Relations and dimensions of graphical symbols
71 Annex B (informative) Chamfers, countersinks, wedges, cones and screw threads
74 Annex C (informative) Former practice
75 Bibliography

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BS EN ISO 129-1:2019+A1:2021
$215.11