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BS 8888:2013

BS 8888:2013

$215.11

Technical product documentation and specification

Published By Publication Date Number of Pages
BSI 2013 128
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This British Standard implements the ISO system for technical product documentation and specification.

The ISO system is defined in a large number of interlinked and related international standards which are referenced in this British Standard.

The purpose of this British Standard is to facilitate the use of the ISO system by providing:

  • an index to the international standards which make up the ISO system, referencing them according to their area of application;

  • key elements of the ISO standards to facilitate their application;

  • references to additional British and European Standards where they provide information or guidance over and above that provided by ISO standards; and

  • commentary and recommendations on the application of the standards where this is deemed useful.

The requirements refer to International and European Standards which have been implemented as British Standards, either in the BS EN, BS EN ISO, BS ISO series or as International Standards renumbered as British Standards.

Annex A (normative) contains a list of normative references, indispensable for the application of this British Standard.

Annex B (informative) contains a list of informative references.

Annex C (informative) gives examples of geometrical tolerances and requirements associated with them.

Annex D (normative) contains requirements for enhanced security.

PDF Catalog

PDF Pages PDF Title
7 Foreword
9 Section 1: Scope
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
11 Section 2: Standards underpinning BS 8888
2.1 General
12 Section 3: Symbols and abbreviations
3.1 Symbols and abbreviations
14 Section 4: Principles of specification
4.1 General principles of specification
4.2 Date of issue principle
4.3 Reference condition principle
15 4.4 Interpretation
4.5 Decimal principle
4.6 Rigid workpiece principle
16 4.7 Representation of features
17 Section 5: Fundamental concepts
5.1 Properties
5.2 Features
18 Figure 1 Interrelationship of the geometrical feature definitions
19 5.3 Interpretations of limits of size for a feature-of-size
20 Figure 2 Possible interpretations of size limits where no form control is defined and the specification is incomplete
22 Section 6: Dimensioning
6.1 Dimensioning methods
23 Figure 3 Example: expression of two deviations to the same number of decimal places
Figure 4 Example: expression of two limits of size to the same number of decimal places
Figure 5 Example: expression of deviations from dimensions displayed in accordance with BS EN ISO 286-1
Figure 6 Positioning of dimensions
24 Figure 7 Arrangement and indication of dimensions internal and external features
Figure 8 Grouping of relative dimensions of features or objects in close proximity
25 Figure 9 Elements of dimensioning
Figure 10 Dimension line of feature that is broken
26 Figure 11 Dimension lines of holes
27 Figure 12 Extension lines
Figure 13 Oblique extension lines
Figure 14 Intersection of projected contours of outlines
28 Figure 15 Intersection of projected contours of transitions and similar features
Figure 16 Extension lines of angular dimensions
29 Figure 17 Position of dimensional values
Figure 18 Position of dimensional values
30 Figure 19 Orientation of linear dimensions
Figure 20 Orientation of angular dimensions
31 Figure 21 Components of a toleranced dimension
Figure 22 Components of a toleranced dimension
Figure 23 Components of a toleranced dimension
32 SameLvl
Figure 24 Limits of dimensions
Figure 25 Single limit dimension
Figure 26 Indications of special dimensions: Radius
33 Figure 27 Indications of special dimensions: Square
Figure 28 Indications of special dimensions: Spherical diameter
Figure 29 Indications of special dimensions: Spherical radius
Figure 30 Indications of special dimensions: Thickness
34 Figure 31 Diameter and depth of counterbore
Figure 32 Size and angle of countersink
35 Figure 33 Number of equally-spaced features and the dimensional value
Figure 34 Dimensioning of angular spacing
Figure 35 Angles of spacings
36 Figure 36 Indication of features having the same dimensional value
Figure 37 Indication of features having the same dimensional value
37 Figure 38 Dimension of external chamfer not equal to 45°
Figure 39 Dimension of external chamfer equal to 45°
Figure 40 Dimension of internal chamfer not equal to 45°
38 Figure 41 Dimension of internal chamfer equal to 45°
Figure 42 Dimension of countersink
Figure 43 Dimension of countersink: simplification
39 Figure 44 Symmetrical parts
Figure 45 Symmetrical parts
40 Figure 46 Symmetrical parts
Figure 47 Indication of level on vertical view
Figure 48 Indication of level on horizontal view or section
41 Figure 49 Example of curved feature defined by radii
Figure 50 Example of curved feature defined by radii
42 Figure 51 Curved feature defined by coordinate dimensions
Figure 52 Curved features defined by coordinate dimensions
43 Figure 53 Example of chain dimensioning
Figure 54 Example of parallel dimensioning
44 Figure 55 Example of parallel dimensioning
45 Figure 56 Two dimension lines, inclined to each other, and two origins
Figure 57 Running dimensioning of angles
46 Figure 58 Cartesian coordinate dimensioning
47 6.2 Dimensioning common features
Figure 59 Cartesian coordinate dimensioning
49 Figure 60 Dimensioning of keyways
50 6.3 Tolerance dimensions
51 Table 1 Permissible deviations for linear dimensions except for broken edges
Table 2 Permissible deviations for broken edges (external radii and chamfer heights)
Table 3 Permissible deviations of angular dimensions
52 6.4 Edges specification
Figure 61 Use of general tolerance notes
53 Table 4 Examples of indication of edges
54 Section 7: Geometrical product specification
7.1 Interpretation and invocation principle
7.2 Independency principle
55 7.3 Feature principle
7.4 Default principle
7.5 Reference condition principle
7.6 Rigid workpiece principle
7.7 Datums and datum systems
56 Figure 62 Tolerance defining a datum system
57 Figure 63 Degrees of freedom
58 Figure 64 Datum based on a planar datum feature
59 Figure 65 Datum based on two parallel, opposed planes (external)
60 Figure 66 Datum feature consisting of a non-ideal cylinder (external)
61 Figure 67 Datum feature consisting of a non-ideal sphere (external)
63 Figure 68 Datum feature consisting of a non-ideal wedge
64 Figure 69 Datum feature consisting of a non-ideal cone
65 Figure 70 Datum feature consisting of a non-ideal complex surface
67 Table 5 Example: single datum
68 Figure 71 Common datum established from two coaxial cylinders
69 Table 6 Examples: datum systems
70 Table 7 Examples: datum systems
71 Figure 72 Application of datum targets
72 Figure 73 Application of datum targets
Figure 74 Single datum target frame
Figure 75 Datum target point
73 Figure 76 Open datum target line
Figure 77 Datum target area
Figure 78 Indicator for single datum target point
Figure 79 Indicator for single datum target line
74 Figure 80 Indicator for single datum target surface
Figure 81 Indicator for single datum target point
Figure 82 Indicator for single datum target point
75 Figure 83 Indication of datums established from datum targets
Figure 84 Simplification of drawing indication when there is only one datum target area
76 Figure 85 Datums based on more than one datum target
77 Figure 86 Application of “orientation-only” modifier
Figure 87 Indication of which modifier is need in the set of situation features
78 7.8 Geometric tolerances
79 Table 8 Symbols for geometrical characteristics
80 Table 9 Additional symbols
81 Figure 88 Tolerance applying to more than one feature
Figure 89 Indications qualifying the form of the feature within the tolerance zone
Figure 90 Requirements given in tolerance frames one under the other
82 Figure 91 Arrowhead terminating on the outline of the feature or as an extension
Figure 92 Arrowhead terminating as an extension of the dimension line
83 Figure 93 Width of tolerance zone applying to the specified geometry
Figure 94 With of tolerance zone, otherwise indicated
84 Figure 95 Orientation of the width of a positional tolerance zone
Figure 96 Orientation of the width of an orientation tolerance zone
85 Figure 97 Tolerances perpendicular to each other
Figure 98 Cylindrical and circular tolerance zones
86 Figure 99 Tolerance zones applied to separate features
Figure 100 Single tolerance zone applied to separate features
87 Figure 101 Examples of the use of the “all around” symbol
88 Figure 102 Examples of “MD” and “LD”
Figure 103 Use of theoretically exact dimensions (TEDs)
89 Figure 104 Examples of tolerances of the same characteristic
Figure 105 Tolerance applied to a restricted part of a feature
90 Figure 106 Projected tolerance zone
Figure 107 Indication of the maximum material requirement
Figure 108 Indication of the least material requirement
91 Figure 109 Free state condition
Figure 110 Use of several specification modifiers
92 Section 8: Surface texture specification
94 Section 9: Technical product documentation
9.1 Graphical representation and annotation of 3-D data (3-D modelling output)
9.2 Drawing sheets
Table 10 Sizes of trimmed and untrimmed sheets and the drawing space A)
95 Figure 111 Size A4 to A0
96 9.3 Line types and line widths
Table 11 Number of fields
Table 12 Basic types
97 9.4 Scales
Table 13 Scales
98 9.5 Lines
9.6 Lettering
99 9.7 Projections
100 Figure 112 Labelled view method
101 Figure 113 First angle projection method
Figure 114 First angle projection method: Graphical symbol
102 9.8 Views
Figure 115 Third angle projection method
Figure 116 Third angle projection method: Graphical symbol
103 9.9 Sections
Figure 117 Auxiliary view showing true shape of inclined surface
104 Figure 118 Auxiliary view showing true shape of inclined surface
Figure 119 Auxiliary view showing true shape of inclined surface
105 9.10 Representation of features
Figure 120 Auxiliary view showing true shape of inclined surface
106 9.11 Representation of components
108 Section 10: Document handling
10.1 Types of documentation
10.2 Security
109 10.3 Storage
10.4 Marking
110 10.5 Protection notices
Figure 121 BS 8888 independency system symbol
Figure 122 BS 8888 dependency system symbol
111 Annex A Normative references
116 Annex B Bibliography
118 Annex C Geometrical tolerancing
Table C.1 Examples of geometrical tolerancing
125 Annex D Document security – Enhanced

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BS 8888:2013
$215.11