BSI BritishStandards
Technicalproductspecification- Specification
Publishing and copyright information
BSI 2008
ISBN 978 0 580 60368 6
ICS 01.100.01; 01.110
Publication history
First published August 2000 Second edition October 2002Third edition October 2004Fourth edition October 2006 Fifth edition November 2008
Amendments issued since publication
The BSl copyright notice displayed in this document indicates when thedocument was last issued.
The following BSIreferences relate to the work on this standard:Committee reference TDW/4Draft for ment 08/ DC
Text affected
Contents
List of annexes
List of figures
Foreword i2 References2 Scope13 Terms and definitions 24 5 Types of documentation 5 Global standards underpinning BS 888836 7 Scales7 Lines arrows and terminators 78 Lettering 89 10 Projections Views11 Symbols and abbreviations Sections 1013 12 Representation of features 1214 15 Representation of ponents 13 Dimensioning and tolerancing16 Geometrical tolerancing 2017 18 Surface texture indication 21 Graphical representation and annotation of 3-D data (3-Dmodelling output) 2220 19 Verification 23 Security 2321 22 Storage and retrieval24 Marking23 Protection notices 26 24
Annex A (normative) Normative references 27 Annex B (informative) Informative references 48Annex D (informative) Cast forged and moulded parts 51 Annex C (informative) Expression of the concept 50Annex E (normative) Document security- Enhanced 59tolerancing and ASME Y14.5 geometric dimensioning and tolerancing Annex F (informative) Key differences between BS 8888 geometrical(GD&T)60Annex G (informative) Forthing amendments to BS ISO 1101:2004 64product specification (GPS)75 Annex H (informative) Technical product specification Geometrical
Figure 1-Metricreference graduations 6 Figure 2-Auxiliary view showing true shape of inclined surface10Figure 3 Permissible interpretations when no form control is givenon the drawing16 Figure 4 - Dimensioning of keyways 19Figure 5- Examples of general tolerance notes 20Figure 6 Method of indicating that the independency system of tolerancing had been used 25Figure7-Method of indicating that the dependency system oftolerancing had been used Figure D.1 Reproduced Figure E.1 from ISO 8062-3 showing the TPS 25for the example cast part54 Figure D.2 Reproduced Figure E.2 from ISO 8062-3 showing theexample cast part with the applicable general straightness tolerancesapplied 55
List of tables
Summary of pages
Figure D.3 Reproduced Figure E.5 from ISO 8062-3 showing theapplied 55 example cast part with the applicable general parallelism tolerancesFigure D.4 Reproduced Figure 1 from BS 7010 showing thoseFigure G.1-Indication of orientation of the tolerance zone 69 dimensions which relate to the mould and mould closure58Figure G.2 - Use of the median feature 69 Figure G.3 - Restricted parts of a feature 69Figure G.4 - Example of a mon tolerance zone69Figure G.6 - Examples of the use of the *all around" symbol70 Figure G.5 - Example of a mon tolerance zone 70Figure G.7 - Unequally disposed tolerance zone indicator 70feature71 Figure G.8 - Example of the use of the pound tolerancedFigure G.9 - Indicating the start and end of the pound toleranced feature71Figure G.10 - Indicating a mon set of toleranced features 71Figure G.11- Indicating a mon pound tolerance zone 72 Figure G.12 Two different ways of indicating a GPS with projectedtolerance modifier72Figure G.13 - Explanation of the direction of the extended feature 72Figure G.14 - Example of direct indication of a projected tolerance with an offset73Figure G.15 - Example of indirect indication of a projected toleranceFigure G.16 Example of the use of projected tolerance zone together with an offset 73with the median modifier 74 Figure G.17 Example of the use of projected tolerance zone togetherwith a mon zonemodifier74Figure H.1 -Model of the relationship between specification verification and the actual work piece 76Figure H.2 - The link between design intent and metrology 78Figure H.3 - The duality principle 79
Table A.1-Normative references 28Table B.1 - Informative references 48 Table D.1 - Drawing type indicator graphical symbols52Table D.2 - Examples of part condition identifier application53Table D.3 Collated letter symbols introduced in ISO 10135:200756
Foreword
Publishing information
30 November 2008. It was prepared by Technical Committee TDW/4 This British Standard was published by BSl and came into effect onTechnical product specification (TPs) -Methodology presentation and verification. A list of organizations represented on this mittee canbe obtained on request to its secretary.
Supersession
This British Standard supersedes BS 8888:2006 which is withdrawn.
This new edition updates the fourth edition bringing in relevantstandards published during 2007 and early 2008. It does not representa full revision of the standard which will be undertaken in due course.
Relationshipwith otherpublications
The function of BS 8888 is to draw together in an easily accessiblethe preparation of technical product specifications in accordance manner the full plement of International Standards relevant towith geometrical product specification (GPS) principles. However itis not the intention that BS 8888 should be a “stand-alone" standard since it is part of a triumvirate of TPR (Technical Product Realization)standards also prising BS 8887 and BS 8889.
Ministry of Defence as part of its DEF-STAN for defence project It should be noted that BS 8888 has recently been taken up by thespecification and that BSl does make educational/training aidsavailable in this field and is currently planning a major education/ training initiative which it is expected will lead to a programme ofpetency assessment and certification.
"GPS Relevance”symbol
Because the principal objective of BS 8888 is to provide for accurate standards provision that constitutes the GPS system of dimensioning unambiguous technical product specification (TPS) the particularand tolerancing will be found throughout the document.
Recognizing that on occasion it may be useful to be able to identifythis edition of BS s888 introduces the *GPS Relevance* symbol and pull together certain GPS elements into a continuous sequence segmented symbol is shaded to correlate with the layers of the GPS (see table below) as a means of doing this for the first time. Thissystem itself and is placed in the margin adjacent to the clause orsubclause to which it refers.
unambiguous GPS is built upon a solid base of foundation standards The formation of the symbol is based on the following. Anrelating to fundamental principles and presentation media forsize geometry and surface. example. While the specification of a feature or ponent defines
Where no specific relevance to the GPS system can be identified thesymbol is left unshaded.
