prEN ISO 25935

SLOVENSKI STANDARD
01-april-2026
Specifikacija geometrijskih veličin izdelka (GPS) - Vezana stanja (ISO/DIS
25935:2026)
Geometrical product specifications (GPS) - Restrained states (ISO/DIS 25935:2026)
Geometrische Produktspezifikation (GPS) - Gespannte Zustände (ISO/DIS 25935:2026)
Spécifications géométriques des produits (GPS) - Etats contraints (ISO/DIS 25935:2026)
Ta slovenski standard je istoveten z: prEN ISO 25935
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.

DRAFT
International
Standard
ISO/DIS 25935
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Restrained states
Voting begins on:
Spécifications géométriques des produits (GPS) — Etats
2026-02-11
contraints
Voting terminates on:
ICS: 17.040.40; 17.040.10 2026-05-06
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
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This document is circulated as received from the committee secretariat.
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
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Reference number
ISO/DIS 25935:2026(en)
DRAFT
ISO/DIS 25935:2026(en)
International
Standard
ISO/DIS 25935
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Restrained states
Voting begins on:
Spécifications géométriques des produits (GPS) — Etats
contraints
Voting terminates on:
ICS: 17.040.40; 17.040.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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BE CONSIDERED IN THE LIGHT OF THEIR
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NOTIFICATION OF ANY RELEVANT PATENT
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 25935:2026(en)
ii
ISO/DIS 25935:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic concept . 2
5 Restrained state . 2
5.1 General .2
5.2 Restraining conditions .3
5.2.1 General .3
5.2.2 Restraining features .3
5.2.3 Gravity .3
5.2.4 Forces .4
5.2.5 Other restraining conditions .4
6 Indication . 4
6.1 General indications .4
6.2 Indication of specifications .4
6.3 Indication of restraining features .5
6.4 Indication of gravity .6
6.5 Indication of forces .7
Annex A (informative) Examples . 8
Annex B (informative) Relationship to the GPS matrix model .10

iii
ISO/DIS 25935:2026(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/had not] received notice of
(a) patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification, collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 290, Dimensional and geometrical product specification and verification, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This document cancels and replaces ISO 10579:2010, which has been technically revised. In addition to the
change of number, the main changes to ISO 10579:2010 are as follows:
— New introduction of restrained states for specifying parts under external influences e.g., gravity, forces.
— More than one restrained state may be applied to one part.
— New introduction of graphical symbols and identifiers for indicating restrained states, gravity and force.

iv
ISO/DIS 25935:2026(en)
Introduction
This document is a geometrical product specification (GPS) standard and is to be regarded as a general GPS
standard (see ISO 14638). It influences chain link A in the GPS matrix structure.
The ISO GPS matrix model given in ISO 14638 gives an overview of the ISO GPS system of which this
document is a part. The fundamental rules of ISO GPS given in ISO 8015:2011 apply to this document and
the default decision rules given in ISO 14253-1 apply to the specifications made in accordance with this
document, unless otherwise indicated.
For more detailed information on the relation of this document to other standards and the GPS matrix model,
see Annex B.
According to the rigid workpiece principle in ISO 8015:2011, all parts are by default considered rigid (i.e.
having infinite stiffness) and all GPS specifications apply in a state undeformed by any external forces (in
this document referred to as restraining conditions).
While the rigid workpiece principle applies well for many industrial cases, it is however inadequate in cases
where the deformations (caused by e.g. contact with counterparts, gravity, forces, etc.) are non-negligible
with respect to the part’s function. In such cases it is beneficial to specify the part in restrained state(s).

v
DRAFT International Standard ISO/DIS 25935:2026(en)
Geometrical product specifications (GPS) — Restrained states
1 Scope
This document specifies rules for restrained states.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 128-2:2022, Technical product documentation (TPD) — General principles of representation — Part 2: Basic
conventions for lines
ISO 1101:2017, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
ISO 5459:2024, Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum
systems
ISO 7499:2024, Technical product documentation (TPD) — Unique integral feature identification (UIFI)
ISO 8015:2011, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules
ISO 10209:2022, Technical product documentation — Vocabulary — Terms relating to technical drawings,
product definition and related documentation
3 Terms and definitions
The Terms and definitions clause is a mandatory element of the text.
For rules on the drafting of the Terms and definitions, refer to the ISO/IEC Directives, Part 2:2021, Clause 16.
To insert a new terminological entry, go to the Structure tab and click on Insert Term entry.
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electro
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