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BS EN ISO 129-1:2019

BS EN ISO 129-1:2019

$215.11

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

Published By Publication Date Number of Pages
BSI 2019 78
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ISO 129-1:2018 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. ISO 129-1:2018 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 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
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
21 5.5 Extension line
25 5.6 Leader line
5.7 Dimensional values
5.7.1 Presentation
5.7.2 Placement of dimensional values and symbols
27 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
29 5.8.2 Symbols added to dimensional values
5.9 Tabular dimensioning
30 5.10 Complementary indication
6 Presentation of dimensional tolerances
6.1 General
6.2 Limit deviations
32 6.3 Limit dimensioning
7 Presentation of special dimensions
7.1 Arrangement of graphical and letter symbols with dimensional values
34 7.2 Diameters
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
37 7.4 Spheres
7.5 Between
38 7.6 Arcs, chords and angles
40 7.7 Squares
41 7.8 Equally spaced and repeated features
7.8.1 Equally spaced features
43 7.8.2 Repeated features
44 7.8.3 Tabulated repeated features
45 7.9 Symmetrical workpieces and views
47 7.10 Presentation of levels
48 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
49 7.14.2 Curved features defined by coordinate dimensions
51 7.15 Dimensioning of developed views
7.16 Dimensioning of thin parts
7.16.1 Thickness indication
52 7.16.2 Surface indication
53 7.17 Dimensioning of restricted areas
7.17.1 General Rules
7.17.2 Dimensioning of restricted areas on surfaces of revolution
54 7.17.3 Dimensioning of restricted areas on other than surfaces of revolution
55 8 Arrangements of dimensions
8.1 General
8.2 Chain dimensioning
8.3 Parallel dimensioning
56 8.4 Running dimensioning
8.4.1 General
8.4.2 Unidirectional and bidirectional running dimensions
60 8.5 Coordinate dimensioning
8.5.1 Cartesian coordinate dimensioning
62 8.5.2 Polar coordinate dimensioning
63 8.6 Combined dimensioning
64 9 Notes and special notations
9.1 Flag notes
66 9.2 Indication of textual instructions
68 Annex A (normative) Relations and dimensions of graphical symbols
72 Annex B (informative) Chamfers, countersinks, wedges, cones and screw threads
75 Annex C (informative) Former practice
76 Bibliography

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BS EN ISO 129-1:2019
$215.11