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eLibrary > 25/30483944 DC BS 8888 Technical product documentation and specification >

25/30483944 DC BS 8888 Technical product documentation and specification, 2025

30483944-Form 36
900000000000000490_for PDF [Go to Page]
Section 1: Scope
1 Scope
2 Normative references
3 Terms, definitions and symbols [Go to Page]
3.1 Terms and definitions [Go to Page]
3.1.1 surface texture
3.1.2 profile surface texture
3.1.3 areal surface texture
3.1.4 skin model non-ideal surface model
3.1.5 mechanical surface
3.1.6 electromagnetic surface
3.1.7 nesting index Nis, Nic, Nif
3.1.8 profile S-filter
3.1.9 profile L-filter
3.1.10 profile F-operation
3.1.11 surface profile trace
3.1.12 mechanical profile
3.1.13 electromagnetic profile
3.1.14 scale-limited profile
3.1.15 primary surface profile
3.1.16 primary profile P-profile
3.1.17 waviness profile W-profile
3.1.18 roughness profile R-profile
3.1.19 reference line
3.1.20 evaluation length le
3.1.21 section length lsc
3.1.22 number of sections nsc
3.1.23 setting class Scn
3.1.24 primary surface
3.1.25 primary extracted surface
3.1.26 S-F surface
3.1.27 S-L surface
3.1.28 scale‑limited surface
3.1.29 reference surface
3.1.30 evaluation area A Ã
3.1.31 field parameter
3.1.32 feature parameter
3.1.33 V‑parameter
3.1.34 S‑parameter
3.1.35 associated feature
3.1.36 association
3.1.37 date of issue
3.1.38 derived feature
3.1.39 extracted feature
3.1.40 free state
3.1.41 geometrical product specification and verification
3.1.42 integral feature
3.1.43 nominal feature
3.1.44 real feature
3.1.45 restrained state
3.1.46 specification
3.1.47 technical product documentation (TPD)
3.1.48 technical product specification (TPS)
3.2 Symbols
Section 2: Standards underpinning BS 8888
4 General
5 Introduction
6 Functional specifications
7 Manufacturing specifications
8 Verification specifications
9 Principles of specification [Go to Page]
9.1 Working with 3D CAD data
9.2 Level of detail in a specification
9.3 Reference conditions
9.4 Interpretation
9.5 Decimal principle
9.6 Definitive specification principle
9.7 Rigid workpiece principle
9.8 Non-rigid workpieces
9.9 Fundamental concepts [Go to Page]
9.9.1 Properties
9.9.2 Feature principle
9.9.3 Interpretations of limits of size for a feature of size [Go to Page]
9.9.3.1 Relevant standards
9.9.3.2 Interpretations of limits of size for a linear feature of size
9.9.3.3 Interpretations of limits of size for an angular feature of size
9.10 Geometrical product specification [Go to Page]
9.10.1 Interpretation and invocation principle
9.10.2 Independency principle
9.11 Identification and classification of specification requirements [Go to Page]
9.11.1 General
9.11.2 Identification
9.11.3 Classification
Section 4: Technical product documentation (TPD)
10 Formatting of TPD [Go to Page]
10.1 General [Go to Page]
10.1.1 Product definition classification code 1 (2D drawing only) – Drawing with optional data set
10.1.2 Product definition classification code 2 (2D drawing with supplementary 3D CAD model) – Data set with design model and drawing containing specifications
10.1.3 Product definition classification code 3 (simplified 2D drawing with 3D CAD model) – Data set with design model or annotated model and simplified drawing.
10.1.4 Product definition classification code 4 (2D drawing with 3D CAD model) – Data set with annotated model and drawing
10.1.5 Product definition classification code 5 (annotated 3D CAD model) – Data set with annotated model
10.2 3D CAD data used in a TPD
10.3 Drawing sheets used in a TPD
10.4 Graphical representation and annotation of 3D data (3D modelling output)
10.5 Drawing sheets [Go to Page]
10.5.1 General
10.5.2 Sizes
10.5.3 Graphical features [Go to Page]
10.5.3.1 Title block
10.5.3.2 Borders and frame
10.5.3.3 Grid reference system
10.6 Line types and line widths [Go to Page]
10.6.1 Types of line
10.6.2 Line width
10.6.3 Colours
10.7 Scales
10.8 Lines [Go to Page]
10.8.1 Lines and terminators
10.8.2 Lines, terminators and origin indicators
10.9 Number formats [Go to Page]
10.9.1 General
10.9.2 Metric values
10.10 Lettering [Go to Page]
10.10.1 General
10.10.2 Lettering size
10.10.3 Notes
10.11 Projections [Go to Page]
10.11.1 General
10.11.2 Conventions for arrangement of views on a TPD [Go to Page]
10.11.2.1 General
10.11.2.2 Choice of views
10.11.2.3 Labelled view method
10.11.2.4 First angle projection method [Go to Page]
10.11.2.4.1 General
10.11.2.4.2 First angle projection method – Graphical symbol
10.11.2.5 Third angle projection method [Go to Page]
10.11.2.5.1 General
10.11.2.5.2 Third angle projection method – Graphical symbol
10.12 Views [Go to Page]
10.12.1 General
10.12.2 Auxiliary views
10.13 Sections
10.14 Representation of components [Go to Page]
10.14.1 General
10.14.2 Representation of moulded, cast and forged components
10.14.3 Representation of moulded components
Section 5: Dimensioning [Go to Page]
10.15 General
10.16 Dimensioning methods [Go to Page]
10.16.1 Presentation rules [Go to Page]
10.16.1.1 Dimensioning shall conform to BS ISO 129-1.
10.16.1.2 Only the dimensions which are necessary to unambiguously define the nominal geometry of the product shall be specified.
10.16.1.3 The size of a feature or relationship between features shall be dimensioned only once.
10.16.1.4 Unless otherwise specified, dimensions shall be indicated for the finished state of the dimensioned feature.
10.16.1.5 All dimensions, graphical symbols and annotations shall be indicated such that they can be read from the bottom or right-hand side (main reading directions) of the drawing. Dimensioning and annotations of 3D models shall be in accordance wit...
10.16.1.6 Dimension shall be used with other specification techniques as applicable, e.g. geometrical tolerancing or surface texture requirements.
10.16.1.7 Lettering on drawings shall be in accordance with BS EN ISO 3098 (all parts).
10.16.1.8 There shall be only one lettering height for dimension and tolerance indication for a TPS.
10.16.1.9 All dimensions shall be toleranced, either via a general tolerance or by direct indication of tolerance or limit indications, except for the following cases:
10.16.2 Presentation of decimals
10.16.3 Positioning of dimensions
10.16.4 Units of dimensions
10.16.5 Elements of dimensioning: usage [Go to Page]
10.16.5.1 General
10.16.5.2 Dimension line
10.16.5.3 Extension lines
10.16.5.4 Leader line
10.16.6 Dimensional values [Go to Page]
10.16.6.1 Indication
10.16.6.2 Positions of dimensional values
10.16.7 5 Indications of special dimensions
10.16.8 Auxiliary dimensions
10.16.9 5.2.9 Equally-spaced and repeated features [Go to Page]
10.16.9.1 Equally-spaced features
10.16.9.2 Repeated features
10.16.10 Chamfers [Go to Page]
10.16.10.1 External chamfer
10.16.10.2 Internal chamfer
10.16.11 Countersink
10.16.12 Indication of levels
10.16.13 Dimensioning of curved features [Go to Page]
10.16.13.1 Curved feature defined by radii
10.16.13.2 Curved feature defined by coordinate dimensions
10.16.14 Arrangements of dimensions [Go to Page]
10.16.14.1 General
10.16.14.2 Chain dimensioning
10.16.14.3 Parallel dimensioning
10.16.14.4 Running dimensioning [Go to Page]
10.16.14.4.1 General
10.16.14.4.2 Running dimensioning in two directions
10.16.14.4.3 Running dimensioning of angles
10.16.15 Cartesian coordinate dimensioning
10.17 Dimensioning common features [Go to Page]
10.17.1 Dimensioning of slots
10.17.2 Keyways
10.17.3 Screw threads
10.18 Dimensional tolerancing [Go to Page]
10.18.1 General
10.18.2 Methods of specifying tolerances
10.18.3 Indication of tolerances [Go to Page]
10.18.3.1 General
10.18.3.2 Limit deviations
10.18.3.3 Limits of dimension [Go to Page]
10.18.3.3.1 Maximum and minimum limit dimensions
10.18.3.3.2 Single limit dimensions
10.18.4 Functional dimensions
10.19 Implied dimensions
Section 6: Datums and datum systems
11 Datums and datum systems overview [Go to Page]
11.1 General
11.2 Datum systems
11.3 Identifying datum features: Placement of the datum feature indicator [Go to Page]
11.3.1 Datums based on single feature
11.3.2 Datums based on multiple datum features
11.3.3 Datums based on threaded features, gears or splines
11.4 Deriving datums from datum features
11.5 Indications of situation features in a technical product specification
11.6 Common datums [Go to Page]
11.6.1 General
11.6.2 Common datums based on two coaxial cylinders
11.6.3 Common datums based on two parallel cylinders
11.6.4 Common datums based on a group of cylinders
11.6.5 Association for common datums
11.7 Datum systems and the six degrees of freedom
11.8 Datum targets [Go to Page]
11.8.1 General
11.8.2 Datum target frame
11.8.3 Datum target symbol
11.8.4 Leader line
11.8.5 Datum target areas
11.8.6 Datum feature indicators used with datum targets
11.8.7 Datums based on more than one datum target
11.9 Modifying the effects of datums [Go to Page]
11.9.1 “Orientation only” modifier
11.9.2 Situation feature modifiers
Section 7: Specifications
12 Geometrical specification [Go to Page]
12.1 Geometric tolerances
12.2 Basic concepts
12.3 Symbols
12.4 Geometrical specification indication
12.5 Tolerance indicator [Go to Page]
12.5.1 General
12.5.2 Symbol section
12.5.3 Tolerance zone section
12.5.4 Datum section
12.6 Tolerance zones
12.7 Toleranced features
12.8 Theoretically exact dimensions (TED)
12.9 Material condition modifiers [Go to Page]
12.9.1 Maximum material requirement applied to the toleranced feature
12.9.2 Maximum material requirement applied with a zero tolerance
12.9.3 Maximum material requirement applied to a datum reference in a tolerance indicator
12.9.4 Least material requirement applied to the toleranced feature
12.9.5 Least material requirement applied with a zero tolerance
12.9.6 Least material requirement applied to a datum reference in a tolerance indicator
12.9.7 Reciprocity requirement (RPR)
12.9.8 Direct indication of virtual size
12.10 Additional indications relating to the toleranced feature [Go to Page]
12.10.1 Projected tolerance zone
12.10.2 Free-state condition
12.10.3 Tolerances applied to threaded features
12.10.4 Tolerances applied to splines and gears
12.11 Unequal tolerance zone (UZ)
12.12 Restrictive specifications [Go to Page]
12.12.1 Tolerance requirements applied to a specific restricted portion of a feature
12.12.2 Tolerance requirements applied to any given restricted portion of a feature
12.13 Interrelationship of geometrical tolerances
Section 8: Indications for geometrical tolerances
13 Additional indications for geometrical tolerances [Go to Page]
13.1 Restricted or compound tolerancing of features [Go to Page]
13.1.1 Between
13.1.2 All-around
13.1.3 All-over
13.2 United features
13.3 Feature patterns (CZ, CZR, SZ and SIM) [Go to Page]
13.3.1 Internal and external constraints
13.3.2 Specifying a pattern requirement
13.3.3 Nested pattern requirements
13.3.4 Combined geometrical specifications
13.4 Plane and feature indicators [Go to Page]
13.4.1 Intersection plane indicator [Go to Page]
13.4.1.1 Purpose of intersection plane indicators
13.4.1.2 Intersection plane indicator symbol
13.4.2 Orientation plane indicator [Go to Page]
13.4.2.1 Purpose of orientation plane indicators
13.4.2.2 Orientation plane indicator symbol
13.4.3 Collection plane [Go to Page]
13.4.3.1 Purpose of collection planes
13.4.3.2 Collection plane symbol
13.4.4 Direction feature [Go to Page]
13.4.4.1 Purpose of direction features
13.4.4.2 Direction feature symbol
14 General tolerances [Go to Page]
14.1 General tolerance specifications [Go to Page]
14.1.1 Application of general dimensional tolerances
14.1.2 Application of general geometrical tolerances
14.1.3 Application of general tolerances for surface texture and edge conditions
14.2 General dimensional tolerances
14.3 General tolerances and 3D CAD data
14.4 General tolerances to size dimensions and/or surfaces
14.5 General tolerances for linear and angular dimensions without individual tolerance indications
14.6 General tolerances for specific manufacturing processes
Section 9: Statistical tolerancing
15 Statistical tolerances
Section 10: Edges
16 Edges details
Section 11: Welding symbols
17 Symbols [Go to Page]
17.1 The use of welding symbols on a TPS
17.2 Welding symbol
17.3 Arrow line
17.4 Reference line
17.5 Tail
17.6 Elementary symbols
17.7 Broken arrow lines
17.8 Supplementary symbols
Section 12: Surface texture specification
18 Surface texture details [Go to Page]
18.1 General
18.2 Profile surface texture
18.3 Profiles [Go to Page]
18.3.1 Profile surface texture indications [Go to Page]
18.3.1.1 Graphical symbols
18.3.1.2 Positions of surface texture requirements
18.3.1.3 Minimal indications and complete indications for profile surface texture
18.3.2 Profile direction
18.4 Areal surface texture indications
18.5 Positions of surface texture requirements
Section 13: Conformity and nonconformity
19 Conformity and nonconformity [Go to Page]
19.1 Decision rules
19.2 Default decision rules [Go to Page]
19.2.1 General
19.3 Default conformance probability limit
19.4 Default nonconformance probability limit
Section 14: Symbols and abbreviations
20 Symbols and abbreviations [Go to Page]
20.1 General
20.2 Standard symbols and abbreviations
Section 15: Document handling
21 Documents [Go to Page]
21.1 Types of documentation [Go to Page]
21.1.1 General
21.1.2 Presentation media [Go to Page]
21.1.2.1 General
21.1.2.2 Format
21.2 Security [Go to Page]
21.2.1 Introduction
21.2.2 General security
21.2.3 Enhanced security
21.2.4 Security level identification
21.3 Storage
21.4 Marking [Go to Page]
21.4.1 General
21.4.2 Enhanced security
21.5 Protection notices
Annex A (informative) Datums and datum systems: Definitions and explanations [Go to Page]
A.1 Datum feature
A.2 Datum feature indicator
A.3 Datum feature identifier
A.4 Common datum
A.5 Datum section
A.6 Primary datum
A.7 Secondary datum
A.8 Tertiary datum
A.9 Six degrees of freedom
A.10 Situation feature
A.11 Associated feature
A.12 Association
A.13 Association criterion
A.14 Objective function (for association)
A.15 Association constraints
Annex B Normative references
Annex C (informative)
Annex D (informative) Associations [Go to Page]
D.1 Association operations
D.2 Default association operations
D.3 Non-default association operations
D.4 Examples of datums obtained from different datum features [Go to Page]
D.4.1 Datum based on a planar datum feature
D.4.2 Datum based on two parallel, opposed planes (external)
D.4.3 Datum based on two parallel, opposed planes (internal)
D.4.4 Datum based on an external cylindrical feature
D.4.5 Datum based on an internal cylindrical feature
D.4.6 Datum based on an external spherical feature
D.4.7 Datum based on an internal spherical feature
D.4.8 Datum based on an external or internal cone
D.4.9 Datum based on an external or internal wedge
D.4.10 Prismatic feature
D.4.11 Complex surface
Annex E (normative) Document security – Enhanced [Go to Page]
E.1 Enhanced security
E.2 Identification of security classification
E.3 Marking for enhanced security
Annex F (informative) Implementation in CAD [Go to Page]
F.1 General
F.2 Implementation according to BS 8888 and BS EN ISO 5459
F.3 Implementation according to most CAD software
Annex G (informative) Tolerancing system: Former practice
Annex H (informative) Selected ISO fits: Hole and shaft basis [Go to Page]
H.1 General
H.2 Determination of limit deviations using Table H.1 and Table H.2
Annex I (informative) Filtration [Go to Page]
I.1 Introduction
I.2 Filter types
I.3 Filters and nesting indices
I.4 Harmonic content
I.5 Transmission characteristics of linear filters
I.6 Surface texture [Go to Page]
I.6.1 General
I.6.2 Defaults filters
I.6.3 Examples
I.7 Geometric tolerances [Go to Page]
I.7.1 General
I.7.2 Default filters
I.7.3 Examples
I.8 Datums [Go to Page]
I.8.1 Default filters
I.9 Advantages and disadvantages of different filter types
Figure I.5 – Open Gaussian filter with (λc = 0,8 mm), using the moment retainment criterion for end effect correction, applied on a milled surface
Annex J (informative) Dimensioning of slots [Go to Page]
J.1 Defining the size of the slot
J.2 Defining the location of the slot
Annex K (informative) Guidance for parts produced by additive manufacture (AM) [Go to Page]
K.1 General
K.2 Dimensional size
K.3 Geometric form
K.4 Surface finish
K.5 Unique geometry
K.6 Functional grading and four-dimensional shape transformation
K.7 Hybrid manufacturing
Annex L (informative) Castings [Go to Page]
L.1 Background
L.2 Whether to use ISO 8062-3 or ISO 8062-4
Annex M (informative) Examples of profile and areal surface texture specifications, and summary of changes from BS EN ISO 1302 [Go to Page]
M.1 Examples of profile surface texture specification
M.2 Summary of changes from BS EN ISO 1302 [Go to Page]
M.2.1 Tolerance acceptance rules
M.2.2 Graphical symbols
M.2.3 Filter type
M.2.4 Indication of the profile direction
M.2.5 Indication of lay pattern
M.2.6 Setting class
M.2.7 Section length
M.2.8 Number of sections
M.2.9 Profile F-operator association method and element
M.2.10 Method of profile extraction:
M.3 Areal surface texture specifications [Go to Page]
M.3.1 Examples of areal surface texture specifications
Bibliography [Go to Page]

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