Handbook for the geometrical specification of products

The ISO - GPS standards

This handbook recaps seventeen key standards into a succinct six chapters. The most recent of these standards have only just been approved





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Geometrical product specification, which has gone through a complete overhaul to fit a new standardization landscape, represents a strategic component of any industry.


Some of the latest updates to ISO-GPS standards have entailed a number of major fixes. The normative revision process has picked up pace,

and industrial design needs that had so far escaped coverage have finally now been standardized.

Today’s standards are a whole different species to yesterday’s standards.







This handbook is intended as an easy- reference pocket companion, and so features a hands-on index with a clear and readable key system. It also features a glossary giving definitions for a handful of the main key terms.

Four of these chapters get down to the ‘nuts and bolts’ of the topic :




ISBN 978-2-240-03333-8

155 p.

12,90 €


ISBN 978-2-240-03385-7

155 p.

12,90 €


ISBN 978-3-410-23805-8

EBOOK ISBN 978-3-410-23806-5

34 €



The point of departure that sparked this new handbook was the overhauled training programme (1) on ISO-GPS (tolerancing) standards for Renault. The original way in for training on ISO-GPS (tolerancing) standards was directly via the standards, but although this approach looked salient at the outlet, it soon showed its limits as learners repeatedly ran into reiterations and inconsistencies between the original-version standards.

The new training programme proposes (ISO-GPS standards) a new system, where learning sets out from the needs of the product or process designers, each need being paired up to the standards required to meet it. The eight or nine application standards first identified have swelled into close-on two dozen—some already approved, others in final draft stage, but all converging to create a continuous thread tying together knowledge and know-how (2). Re-categorizing the standards into different levels has given an easy-to-understand picture of their role in how design engineers research, code and de-code the specification. This overhaul was necessary on many fronts, not least for structuring skillsets and understanding the normative language employed. All the draft standards have since emerged as approved standards. The move to integrate the draft-phase standards made it possible to gain early feedback and build a capital of insights and experience vital to product development.

I am sincerely grateful to all those who extended their invaluable support as I authored this handbook. Their expert insights, critical proofreads, and valuable advice were precious assets:

– Brigitte Lorrière, standardization advisor at SNECMA metrology laboratories, president of the UNM/08 workgroup and AFNOR (French)-ISO (international) expert sitting on technical committee 213 (ISO-GPS) and UNM commission 08 (Specification);

– Catherine Lubineau, head of development and lead quality manager at the French sectoral standardization office for mechanical engineering (Union de Normalisation de la Mécanique, UNM);

– Alex Ballu, University of Bordeaux 1 Senior Lecturer ('MCF' [Maître de Conférence], 'HDR' [Habilitation à Diriger la Recherche]) at the Institute of Mechanics and Engineering (I2M) Laboratory of Mechanical Physics (LMP), member of the tolerancing research group, and AFNOR (French)-ISO (international) expert sitting on technical committee 213 (ISO-GPS) and UNM commission 08 (Specification);

– Serge Farges, design engineering, metrology, expert in Standardization–Specification–
Measurement (PSA Peugeot Citroën) and AFNOR (French) expert sitting on UNM commission 09 (Measurement);

– Nicolas Lerouge, measurement methodology (PSA Peugeot Citroën), and AFNOR (French)-ISO (international) expert sitting on technical committee 213 (ISO-GPS) and UNM
commission 08 (Specification);

– Luc Mathieu, Full professor ('PU') at the University of Paris-Sud 11 University Institute of Technology (Cachan campus), director of the Cachan ENS automated production research laboratory (LURPA), member of the tolerancing research group, and AFNOR (French)-ISO (international) expert sitting on technical committee 213 (ISO-GPS) and UNM commissions 08 (Specification) and 09 (Measurement);

– Adnan Özögütcü, ISO-GPS standards training consultant (Renault Turkey), ISO-GPS advisor for Turkey;

– Jean-Marc Prenel, electric powertrain design advisor for mechanical engineering (Renault) and AFNOR (French)-ISO (international) expert sitting on technical committee 213 (ISO-GPS) and UNM commission 08 (Specification);

– Alain Van Hoecke, expert in electromechanical engineering (Schneider Electric), and AFNOR (French)-ISO (international) expert sitting on technical committee 213 (ISOGPS) and UNM commission 08 (Specification).

My thanks also go out to all those who kindly provided photograph materials: Catherine Lubineau (UNM), Christophe Lemoine (Metrologic Group).

Frédéric Charpentier

1. Frédéric Charpentier, "Un langage de spécification univoque – formation aux normes ISO-GPS (de tolérancement) – concepteurs
produit/process", Renault Training Programme, January 2009.
2 Frédéric Charpentier, Jean-Marc Prenel, "Les normes ISO-GPS. Une fracture dans l'apprentissage (deuxième partie)", Technologie,
Sciences et techniques industrielles, No. 165, CNDP, Jan-Feb 2010.




Specification by dimension


The datums


Specification by zone


Specification by gauge.





Senior Consultant and trainer in the areas research and development to product design and processes

in the automotive industry , railway industry and the aviation industry .

PhD in mechanical

Expert (Value Management - Value analysis, functional analysis)

Expert (Dimensional and geometrical product specifications and verification)