prEN ISO 5459

Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems (ISO/DIS 5459:2024)

ISO 5459:2011 specifies terminology, rules and methodology for the indication and understanding of datums and datum systems in technical product documentation. It also provides explanations to assist the user in understanding the concepts involved.
ISO 5459:2011 defines the specification operator (see ISO 17450-2) used to establish a datum or datum system. The verification operator (see ISO 17450-2) can take different forms (physically or mathematically) and is not the subject of ISO 5459:2011.
The detailed rules for maximum and least material requirements for datums are given in ISO 2692.

Geometrische Produktspezifikation (GPS) - Geometrische Tolerierung - Bezüge und Bezugssysteme (ISO/DIS 5459:2024)

Dieses Dokument legt die Terminologie, die Regeln und die Methodik zur Angabe und zum Verständnis von Bezügen und Bezugssystemen in technischen Produktdokumentationen fest. Darüber hinaus stellt dieses Dokument Erklärungen zur Verfügung, um den Anwender dabei zu unterstützen, die zugrunde liegenden Konzepte zu verstehen.
Dieses Dokument legt den Spezifikationsoperator (siehe ISO 17450 2) fest, der zur Bildung eines Bezugs oder Bezugssystems verwendet wird. Der Verifikationsoperator (siehe ISO 17450 2) kann unterschiedliche Formen (physikalisch oder mathematisch) annehmen und ist nicht Gegenstand dieses Dokuments.
ANMERKUNG   Die ausführlichen Regeln für Maximum  und Minimum Material Bedingungen für Bezüge sind in ISO 2692 angegeben.

Spécification géométrique des produits (GPS) - Tolérancement géométrique -— Références spécifiées et systèmes de références spécifiées (ISO/DIS 5459:2024)

L'ISO 5459:2011 spécifie la terminologie, les règles et la méthodologie pour indiquer les références spécifiées et les systèmes de références spécifiées dans la documentation technique de produits. Elle fournit également des explications aidant l'utilisateur à la compréhension des concepts considérés.
L'ISO 5459:2011 définit l'opérateur de spécification utilisé pour établir une référence spécifiée ou un système de références spécifiées. L'opérateur de vérification qui peut prendre différentes formes (physique ou mathématique) ne fait pas l'objet de l'ISO 5459:2011.

Specifikacija geometrijskih veličin izdelka - Geometrijsko toleriranje - Reference in sistemi referenc (ISO/FDIS 5459:2024)

General Information

• Status: Not Published
• Publication Date: 02-Nov-2025
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 26-Jun-2024
• Completion Date: 26-Jun-2024
• Ref Project: oSIST prEN ISO 5459:2024 - Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems (ISO/FDIS 5459:2024)

Relations

• Revises: EN ISO 5459:2011 - Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems (ISO 5459:2011)
• Effective Date: 11-Oct-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2024
Specifikacija geometrijskih veličin izdelka - Geometrijsko toleriranje - Reference in
sistemi referenc (ISO/FDIS 5459:2024)
Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum
systems (ISO/FDIS 5459:2024)
Geometrische Produktspezifikation (GPS) - Geometrische Tolerierung - Bezüge und
Bezugssysteme (ISO/FDIS 5459:2024)
Spécification géométrique des produits (GPS) - Tolérancement géométrique -
Références spécifiées et systèmes de références spécifiées (ISO/FDIS 5459:2024)
Ta slovenski standard je istoveten z: prEN ISO 5459
ICS:
17.040.10 Tolerance in ujemi Limits and fits
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

FINAL DRAFT
International
Standard
ISO/FDIS 5459
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Geometrical tolerancing —
Voting begins on:
Datums and datum systems
2024-04-03
Spécification géométrique des produits (GPS) — Tolérancement
Voting terminates on:
géométrique — Références spécifiées et systèmes de références
2024-06-26
spécifiées
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 5459:2024(en) © ISO 2024

FINAL DRAFT
ISO/FDIS 5459:2024(en)
International
Standard
ISO/FDIS 5459
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Geometrical tolerancing —
Voting begins on:
Datums and datum systems
Spécification géométrique des produits (GPS) — Tolérancement
Voting terminates on:
géométrique — Références spécifiées et systèmes de références
spécifiées
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 5459:2024(en) © ISO 2024

ii
ISO/FDIS 5459:2024(en)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 5
5 Role of datums . 7
6 General concepts . 9
6.1 General .9
6.2 Intrinsic characteristics of surfaces associated with datum features .10
6.2.1 General .10
6.2.2 Single datum established from a single feature .11
6.2.3 Common datum established from two or more single features simultaneously .11
6.2.4 Datum systems established in a defined sequence from two or more single
features . 13
6.3 Single datums, common datums and datum systems . 13
6.3.1 General . 13
6.3.2 Single datums . 13
6.3.3 Common datums . .14
6.3.4 Datum systems. 15
7 Graphical language .18
7.1 General .18
7.2 Indication of datum features .18
7.2.1 Datum feature indicator .18
7.2.2 Datum feature identifier.19
7.2.3 Datum targets .19
7.3 Specification of datums and datum systems . 23
7.4 Indication and meaning of rules .24
7.4.1 General .24
7.4.2 Rules .24
8 Specification operators for datum .46
8.1 ISO default specification operator for datum . 46
8.2 Special specification operator for datum . 46
8.2.1 General . 46
8.2.2 Filtration specification elements for datum .47
8.2.3 Association specification elements for datum . 48
8.3 Drawing-default specification operator for datums . 49
Annex A (normative) Association for datums . .50
Annex B (informative) Invariance classes .60
Annex C (informative) Examples .62
Annex D (informative) Former practices .83
Annex E (informative) Examples of a datum system or a common datum established with
contacting features .87
Annex F (normative) Relations and dimensions of graphical symbols .93
Annex G (normative) Establishment of a datum coordinate system from a datum system .96
Annex H (informative) Filter symbols and attached nesting index .100
Annex I (informative) Issue of orientation and location constraints in datum systems .101

iii
ISO/FDIS 5459:2024(en)
Annex J (normative) Filtration of a datum feature which is nominally a plane .108
Annex K (informative) Relation to the GPS matrix model .111
Bibliography .112

iv
ISO/FDIS 5459:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are ca
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