Welcome to ISO/TC 213 


ISO/TC 213 is responsible for international standards relating to the tolerancing, specification and verification of mechanical components. This includes standards for geometrical tolerancing (ISO 1101), datums (ISO 5459), size tolerances (ISO 14405), coordinate measuring machines (CMMs) (ISO 10360 series), and many, many others. 

Industry in Europe, the USA, Japan, China and across the world relies extensively on these standards. They are used in the design and manufacture of aircraft, cars, consumer products, medical devices, energy systems, defence hardware, scientific instruments, and in pretty much every area of industrial activity. 


Who are we? 

ISO/TC 213 is the international committee responsible for creating, updating, and maintaining the ISO GPS standards for geometrical product specifications and verification.

The committee was created in 1996 under the leadership of Danish Standards who ran the area for 21 years. The UK - BSI - took over the secretariat of the committee in 2017. 


Our committee structure and working groups 

ISO/TC 213 - the Technical Committee 

Advisory Groups (AGs)

AG 1, Strategic planning 

AG 2, Final Auditing Standards Team (FAST review group)

AG 12, Mathematical support group 

AG 13, Analysis of interdependence of specifications with respect to product function, verification and testing

Working Groups (WGs)

WG 2, Datums and datum systems 

WG 4, Uncertainty of measurement and decision rules

WG 6, General requirements for geometrical product specification (GPS) measuring equipment

WG 9, Dimensional and geometrical tolerancing for castings

WG 10, Coordinate measuring machines 

WG 12, Size 

WG 14, Vertical GPS principles 

WG 15, GPS extraction and filtration techniques

WG 16, Areal and profile surface texture 

WG 17, Facilitation of GPS implementation 

WG 18, Geometrical tolerancing 


Introduction to the ISO/TC 213 standards - the ISO GPS system

ISO GPS (geometrical product specifications) is an internationally accepted concept covering all of the different requirements - indicated on a technical drawing - for the geometry of industrial workpieces (e.g. size, distance, radius, angle, form, orientation, location, run-out, surface roughness, surface waviness, surface defects, edges, etc.). It includes all related verification principles, measuring instruments and their calibration. Expressed more simply - it is all of the requirements specifying the micro and macro geometry of a product (workpiece) with associated requirements for verification and calibration of related measuring instruments. 

Related ISO pages

Our page on iso.org

Who develops ISO standards?


Want to get involved?

Standards are developed by the people who need them – that could mean you. Technical committees include experts from both standards and industry and these experts are put forward by ISO’s national members. If you want to help shape future standards in your field, contact your national member


ISO/TC 213 rolling meeting schedule - our forthcoming meetings: 

2020 Meeting (1) in Queretaro, Mexico from Monday 27th January to Friday 7th February 2020

2020 Meeting (2) in London, UK from Monday 14th to Friday 25th September 2020

2021 Meeting (1) in St Antonio, Texas, USA,  Monday 1st - Friday 12th February 2021

2021 Meeting (2) - preliminary offer to host from China

Next meeting details - Queretaro, Mexico 2020 

See the news section for further information on our next round of meetings

Ms Sarah Kelly (UK)
Ms Sarah Kelly (UK)
Secretary to ISO/TC 213
BSI, British Standards Institution

+44 (0) 20 8996 7990
Mr Iain Macleod (UK)
Mr Iain Macleod (UK)
Chairperson of ISO/TC 213