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 

Joint Study Group with ISO/TC 10 (JSG1)

Joint working group with ISO/TC 10 SC1 - JWG12, TPD and GPS harmonization

Advisory Groups (AGs)

AG1, Strategy and planning 

AG2, Auditing 

AG12, Mathematical support group 

AG13, Identification of user needs 

Working Groups (WGs)

WG2, Datums and datum systems 

WG4, Uncertainty of measurement and decision rules

WG6, General requirements for geometrical product specification (GPS) measuring equipment

WG9, Dimensional and geometrical tolerancing for castings

WG10, Coordinate measuring machines 

WG12, Size 

WG14, Vertical GPS principles 

WG15, GPS extraction and filtration techniques

WG16, Areal and profile surface texture 

WG17, Facilitation of GPS implementation 

WG18, 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 - Next meeting details

Hybrid meetings in London (face-face plus online access) 

The next round of ISO/TC 213 meetings will take place at the end of February/early March 2023. 

The meetings will be hosted by BSI (UK) at their London offices from Monday 27th February to Friday 10th March 2023. 

Further information to follow ...

Ms Sarah Kelly (UK)
Ms Sarah Kelly (UK)
ISO/TC 213 Committee Manager
BSI, British Standards Institution

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