SIST EN ISO 5458:2018
(Main)Geometrical product specifications (GPS) - Geometrical tolerancing - Pattern and combined geometrical specification (ISO 5458:2018)
Geometrical product specifications (GPS) - Geometrical tolerancing - Pattern and combined geometrical specification (ISO 5458:2018)
This document establishes complementary rules to ISO 1101 to be applied to pattern specifications and
defines rules to combine individual specifications, for geometrical specifications e.g. using the symbols
POSITION, SYMMETRY, LINE PROFILE and SURFACE PROFILE, as well as STRAIGHTNESS (in the case
where the toleranced features are nominally coaxial) and FLATNESS (in the case where the toleranced
features are nominally coplanar) as listed in Annex C.
These rules apply when a set of tolerance zones are grouped together with location or orientation
constraints, through the use of the CZ, CZR or SIM modifiers.
This document does not cover the use of the pattern specifications when the least and maximum
material requirement is applied (see ISO 2692).
This document does not cover the establishment of common datum (see ISO 5459) based on pattern
features.
Geometrische Produktspezifikation (GPS) - Form und Lagetolerierung - Positions- und Mustertolerierung (ISO 5458:2018)
Dieses Dokument legt ergänzende Regeln zu ISO 1101 fest, die auf Elementgruppenspezifikationen anzuwenden sind, und definiert Regeln zur Kombination einzelner Spezifikationen für geometrische Spezifikationen, z. B. durch Verwenden der Symbole POSITION, SYMMETRIE, LINIENPROFIL und FLÄCHENPROFIL sowie GERADHEIT (wenn die tolerierten Geometrieelemente nominal koaxial sind) und EBENHEIT (wenn die tolerierten Geometrieelemente nominal koplanar sind) wie in Anhang C angegeben.
Diese Regeln gelten, wenn eine Reihe von Toleranzzonen durch Verwenden der CZ-, CZR- oder SIM-Modifikatoren mit Nebenbedingungen für Ort oder Richtung zusammengefasst werden.
Dieses Dokument behandelt nicht das Anwenden der Elementgruppenspezifikationen, wenn die Minimum- und die Maximum-Material-Bedingung angewendet wird (siehe ISO 2692).
Dieses Dokument behandelt nicht das Festlegen eines gemeinsamen Bezugs (siehe ISO 5459) basierend auf Gruppenelementen.
Spécification géométrique des produits (GPS) - Tolérancement géométrique - Spécification géométrique de groupes d'éléments et spécification géométrique combinée (ISO 5458:2018)
Le présent document établit des règles complémentaires de celles de l'ISO 1101 à appliquer aux spécifications de groupes d'éléments et définit des règles pour combiner des spécifications individuelles, pour les spécifications géométriques, par exemple en utilisant les symboles de LOCALISATION, SYMÉTRIE, PROFIL DE LIGNE et PROFIL DE SURFACE, ainsi que les symboles de RECTITUDE (dans le cas où les éléments tolérancés sont nominalement coaxiaux) et de PLANÉITÉ (dans le cas où les éléments tolérancés sont nominalement coplanaires) comme listés en Annexe C.
Ces règles s'appliquent lorsqu'un ensemble de zones de tolérances sont regroupées ensemble avec des contraintes de position ou d'orientation, en utilisant les modificateurs CZ, CZR ou SIM.
Le présent document ne couvre pas l'utilisation des spécifications de groupes d'éléments lorsque l'exigence du minimum et du maximum de matière s'applique (voir l'ISO 2692).
Le présent document ne couvre pas non plus l'établissement de référence spécifiée commune (voir l'ISO 5459) basée sur des éléments de groupe d'éléments.
Specifikacija geometrijskih veličin izdelka (GPS) - Geometrijsko toleriranje - Vzorec in kombinirane geometrijske specifikacije (ISO 5458:2018)
Ta dokument določa dopolnilna pravila k standardu ISO 1101, ki se uporabljajo za specifikacije vzorca in opredeljuje pravila za združevanje posameznih specifikacij, npr. z uporabo simbolov POLOŽAJ, SIMETRIJA, LINIJSKI PROFIL in POVRŠINSKI PROFIL ter RAVNOST (v primeru, kjer so tolerančne značilnosti nominalno koaksialne) in PLOŠČATOST (v primeru, kjer so tolerančne značilnosti nominalno koplanarne), kakor je navedeno v dodatku C.
Ta pravila se uporabljajo, ko se nabor tolerančnih območij združi z lokacijskimi ali usmeritvenimi omejitvami z uporabo modifikatorjev CZ, CZR ali SIM.
Ta dokument ne zajema uporabe specifikacije vzorca, ko se uporablja zahteva po minimalnem ali maksimalnem materialu (glej ISO 2692).
Ta dokument ne zajema določanja skupnih referenc (glej ISO 5459) na podlagi značilnosti
vzorca.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 5458:2018
01-september-2018
1DGRPHãþD
SIST EN ISO 5458:2000
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND *36 *HRPHWULMVNRWROHULUDQMH
9]RUHFLQNRPELQLUDQHJHRPHWULMVNHVSHFLILNDFLMH ,62
Geometrical product specifications (GPS) - Geometrical tolerancing - Pattern and
combined geometrical specification (ISO 5458:2018)
Geometrische Produktspezifikation (GPS) - Form und Lagetolerierung - Positions- und
Mustertolerierung (ISO 5458:2018)
Spécification géométrique des produits (GPS) - Tolérancement géométrique -
Spécification géométrique de groupes d'éléments et spécification géométrique combinée
(ISO 5458:2018)
Ta slovenski standard je istoveten z: EN ISO 5458:2018
ICS:
01.100.01 7HKQLþQRULVDQMHQDVSORãQR Technical drawings in
general
17.040.10 Tolerance in ujemi Limits and fits
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND *36 Specification (GPS)
SIST EN ISO 5458:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 5458:2018
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SIST EN ISO 5458:2018
EN ISO 5458
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2018
EUROPÄISCHE NORM
ICS 17.040.10 Supersedes EN ISO 5458:1998
English Version
Geometrical product specifications (GPS) - Geometrical
tolerancing - Pattern and combined geometrical
specification (ISO 5458:2018)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) - Form und
Tolérancement géométrique - Spécification Lagetolerierung - Positions- und Mustertolerierung
géométrique de groupes d'éléments et spécification (ISO 5458:2018)
géométrique combinée (ISO 5458:2018)
This European Standard was approved by CEN on 25 February 2018.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5458:2018 E
worldwide for CEN national Members.
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SIST EN ISO 5458:2018
EN ISO 5458:2018 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 5458:2018
EN ISO 5458:2018 (E)
European foreword
This document (EN ISO 5458:2018) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2018, and conflicting national standards
shall be withdrawn at the latest by December 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5458:1998.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 5458:2018 has been approved by CEN as EN ISO 5458:2018 without any modification.
3
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SIST EN ISO 5458:2018
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SIST EN ISO 5458:2018
INTERNATIONAL ISO
STANDARD 5458
Third edition
2018-05
Geometrical product specifications
(GPS) — Geometrical tolerancing —
Pattern and combined geometrical
specification
Spécification géométrique des produits (GPS) — Tolérancement
géométrique — Spécification géométrique de groupes d'éléments et
spécification géométrique combinée
Reference number
ISO 5458:2018(E)
©
ISO 2018
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and specification modifiers . 3
5 Principles . 3
5.1 General . 3
5.2 Concepts . 4
5.3 Rule A: for position specification . 4
5.4 Rules for pattern specification . 5
5.4.1 General. 5
5.4.2 Rule B: constraints . 5
5.4.3 Rule C: indication of a single indicator pattern specification . 6
5.4.4 Rule D: indication of a multiple indicator pattern specification . 8
5.4.5 Rule E: indication of multi-level single indicator pattern specification .12
5.5 Pattern characteristic .17
Annex A (informative) Former practice, important changes .18
Annex B (informative) Differences between ISO 5458:1998 and this document .20
Annex C (informative) Examples of pattern specifications .22
Annex D (normative) Relations and dimensions of graphical symbols .41
Annex E (informative) Concept diagram for pattern specification and relation with modifiers .42
Annex F (informative) Relation to the GPS matrix model .43
Bibliography .44
© ISO 2018 – All rights reserved iii
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This third edition cancels and replaces the second edition (ISO 5458:1998), which has been technically
revised.
The main changes to the previous edition are as follows:
— exception from the independency principle removed according to ISO 8015;
— rules harmonized to align with ISO 1101;
— unstated rules in ISO 5458:1998 removed;
— concept of “pattern” to control all types of geometrical features introduced more generically, rather
than applying it only with position symbol.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
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 links A, B and C for form, orientation and location.
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 apply to this document and
the default decision rules given in ISO 14253-1 apply to specifications made in accordance with this
document, unless otherwise indicated.
For more detailed information of the relation of this document to the GPS matrix model, see Annex F.
ISO 1101 and other relevant documents, such as those dealing with the least and maximum material
requirement (ISO 2692) and the datum system (ISO 5459), should be taken into consideration when
using this document.
This document provides rules for the tolerancing of a tolerance zone pattern, i.e. a collection of tolerance
zones constrained to each other with or without reference to a datum system which does not lock all
degrees of freedom.
For the presentation of lettering (proportions and dimensions), see ISO 3098-2.
All figures in this document for the 2D drawing indications have been drawn in first-angle projection
with dimensions and tolerances in millimeters. It should be understood that third-angle projection
and other units of measurement could have been used equally well without prejudice to the principles
established.
Annexes A and B provide more information on the changes in practice and differences between this
document and ISO 1101 on one hand and ISO 5458:1998 on the other hand.
© ISO 2018 – All rights reserved v
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SIST EN ISO 5458:2018
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SIST EN ISO 5458:2018
INTERNATIONAL STANDARD ISO 5458:2018(E)
Geometrical product specifications (GPS) — Geometrical
tolerancing — Pattern and combined geometrical
specification
IMPORTANT — The illustrations included in this document are intended to illustrate the text
and/or to provide examples of the related technical drawing specification; these illustrations
are not fully dimensioned and toleranced, showing only the relevant general principles.
In particular, many illustrations do not contain filter specifications. As a consequence, the
illustrations are not a representation of a complete workpiece, and are not of a quality that is
required for use in industry (in terms of full conformity with the standards prepared by ISO/
TC 10 and ISO/TC 213), and as such are not suitable for projection for teaching purposes.
1 Scope
This document establishes complementary rules to ISO 1101 to be applied to pattern specifications and
defines rules to combine individual specifications, for geometrical specifications e.g. using the symbols
POSITION, SYMMETRY, LINE PROFILE and SURFACE PROFILE, as well as STRAIGHTNESS (in the case
where the toleranced features are nominally coaxial) and FLATNESS (in the case where the toleranced
features are nominally coplanar) as listed in Annex C.
These rules apply when a set of tolerance zones are grouped together with location or orientation
constraints, through the use of the CZ, CZR or SIM modifiers.
This document does not cover the use of the pattern specifications when the least and maximum
material requirement is applied (see ISO 2692).
This document does not cover the establishment of common datum (see ISO 5459) based on pattern
features.
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 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
ISO 8015, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules
ISO 17450-1, Geometrical product specifications (GPS) — General concepts — Part 1: Model for geometrical
specification and verification
ISO 17450-2, Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets,
specifications, operators, uncertainties and ambiguities
ISO 22432, Geometrical product specifications (GPS) — Features utilized in specification and verification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8015, ISO 1101, ISO 17450-1,
ISO 17450-2, ISO 22432 and the following apply.
© ISO 2018 – All rights reserved 1
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
pattern specification
combined requirement indicated by a set of geometrical specifications, and controlled by a tolerance
zone pattern
Note 1 to entry: The geometrical features controlled by a pattern specification can be a set of compound features,
united features or single features, which can be features of size (linear or angular).
Note 2 to entry: Annex C provides examples of pattern specifications in Table C.1.
Note 3 to entry: The set of pattern features controlled by a pattern specification does not define a united feature.
A united feature can be a pattern feature, i.e. one of the members of the toleranced features controlled by a
pattern specification.
3.2
pattern feature
geometrical feature which is a member of the set of features controlled by a pattern specification
3.3
tolerance zone pattern
combination of more than one tolerance zone, having, without priority between them, constraints of
orientation and location, or constraints of orientation
Note 1 to entry: A tolerance zone pattern is composed of several tolerance zones which can have different nominal
geometries.
Note 2 to entry: A tolerance zone pattern can be established without external constraint or with orientation
constraint and/or location constraint from a datum system.
3.4
pattern characteristic
geometrical characteristic controlled by a pattern specification
3.5
theoretical exact feature pattern
TEF pattern
combination of more than one TEF having, without priority between them, constraints of orientation
and location, or constraints of orientation, used to establish the pattern characteristic
Note 1 to entry: A TEF pattern is composed of several TEFs which can have different nominal geometries and
constrained between them, with respect to their relative location and/or orientation.
Note 2 to entry: A TEF pattern can be established without external constraint or with orientation constraint
and/or location constraint from a datum system.
3.6
single indicator pattern specification
pattern specification, controlled by one tolerance indicator specification
3.7
multiple indicator pattern specification
pattern specification, controlled by more than one tolerance indicator specification
3.8
multi-level single indicator pattern specification
single indicator pattern specification applied to more than one group of toleranced features
2 © ISO 2018 – All rights reserved
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
3.9
internal constraint
location constraint and/or orientation constraint between the individual tolerance zones of the
tolerance zone pattern
3.10
external constraint
location constraint and/or orientation constraint between a tolerance zone or tolerance zone pattern
and a datum system
4 Symbols and specification modifiers
For the purposes of this document, the specification modifiers of Table 1 shall apply.
Rules for the presentation of graphical symbols shall be in accordance with Annex D.
Table 1 — Specification modifiers
Applied to Symbol Description Internal constraint Modifier defined in
Toleranced
UF United feature Not applicable ISO 1101
feature
SZ Separate zones None 5.1
Simultaneous require- Orientation and location
a,b
SIMi 5.4.4
ment No. i constraints
Tolerance zones
CZ Combined zone Orientation and location 5.4.3, 5.4.5 and ISO 1101
Combined zone rota-
CZR Orientation constraint only 5.4.3 and 5.4.5
tional only
a
An identification number i can be associated to the modifier SIM. In this case there is no space between SIM and i.
b
“SIM” in ISO 8785 is used for a family of “surface imperfection” parameters with indices (e.g. a, n, t, w, cd, ch, sh, n/A).
The modifier simultaneous requirement (SIM) as indicated in this document shall not be confused with the indication of a
surface imperfection parameter (e.g. SIM1 versus SIMt).
5 Principles
5.1 General
According to the feature principle (see ISO 8015:2011, 5.4), by default a geometrical specification
applies to one complete single feature as defined in ISO 22432. It is the designer’s responsibility to
select the features or portions of features to which a specification applies and either indicate that on a
2D drawing using appropriate symbology or define it in the CAD model.
According to the independency principle (see ISO 8015:2011, 5.5), by default a geometrical specification
that applies to more than one single feature applies to those features independently. The tolerance zones
defined by one tolerance indicator or by several tolerance indicators shall be considered independently
by default; this corresponds to the meaning of the modifier SZ. When the same geometrical specification
is applied to several toleranced features, for all geometrical specifications other than position
specifications, the indication of SZ modifier is redundant (see rule A for position specification, 5.3).
If it is required that the geometrical specification applies to the features simultaneously with some
constraint between the tolerance zones, it is the designer’s responsibility to either indicate this on a 2D
drawing or in the CAD model using appropriate pattern specifications.
In order to manage functional requirements for a set of features, they can be controlled simultaneously
by means of a pattern specification, using tolerance zone pattern modifiers CZ, CZR or SIMn.
The use of the concept of “simultaneous requirement” transforms a set of more than one geometrical
specification into a combined specification, i.e. a pattern specification.
© ISO 2018 – All rights reserved 3
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
There are two ways to create a tolerance zone pattern, either by using a single indicator pattern
specification with the CZ or CZR modifiers [see Figure 1 a) and rules C and E] or by using a multiple
indicator pattern specification using SIM modifiers [see Figure 1 b) and rule D (5.4.4)].
a) Single indicator pattern specification b) Multiple indicator pattern specification
Figure 1 — Example of pattern specifications
5.2 Concepts
A pattern specification consists of both a set of more than one geometrical feature and a tolerance zone
pattern. The set of tolerance zones in the tolerance zone pattern have internal constraints, which are
defined by implicit or explicit TEDs.
If necessary, external constraints to a tolerance zone pattern can be defined by referencing a datum
system, as defined in ISO 5459. The values of external constraints are defined by implicit or explicit TEDs.
The main specification elements of a pattern specification are:
— the identification of a single indicator pattern specification or a multiple indicator pattern
specification;
— the internal constraint (in orientation and/or in location) between the individual tolerance zones of
the tolerance zone pattern defined by TEDs;
— the tolerance zone pattern defined as a collection of individual tolerance zones;
— if applicable, external constraints (in orientation and/or in location) of the tolerance zone pattern
defined by TEDs from a datum system, see ISO 5459.
There is no functional difference between using n identical specifications or a pattern specification
(with n members) when these specifications refer to a datum system which locks all degrees of freedom
of the related tolerance zones. However, there is a difference from a characteristic point of view: there
is only one pattern characteristic defined for a pattern specification, whereas there are n geometrical
characteristics defined each one for the n individual specifications.
There is a functional difference between using n identical specifications or a pattern specification (with
n members) when the pattern specification refers to a datum system which does not lock all degrees of
freedom of the related tolerance zones, or when the pattern specification does not refer to a datum system.
The rules, applied for pattern specification and their repetitions, are given in 5.3 and 5.4. A concept
diagram in Annex E illustrates these rules. Examples with their meanings are given in Annex C.
5.3 Rule A: for position specification
When a position specification is applied to several geometrical features and the tolerance zones have at
least one unlocked non-redundant degree of freedom, either the SZ or CZ or CZR modifier shall always
be indicated in the tolerance section, see Figure 2 and for former practice, see Annex A.
4 © ISO 2018 – All rights reserved
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SIST EN ISO 5458:2018
ISO 5458:2018(E)
Using the SZ modifier to a position specification without datum section makes the specification
meaningless.
NOTE This rule is in line with the independency principle stated in ISO 8015. However, ISO 5458:1998 was
in conflict with the independency principle, since a pattern specification without the CZ modifier implied that
the tolerance zones for the repeated specifications were related with internal constraints, and thus dependent
on each other (see Annex A and Annex B). Rule A (5.3), which includes the exception for position specification,
eliminates this conflict.
a) Pattern specification b) Not a pattern specification: Two c) Pattern specification
without a datum independent specifications with a datum
with a datum
Figure 2 — Example of geometrical specifications which are or are not pattern specification
5.4 Rules for pattern specification
5.4.1 General
To create a single indicator pattern specification, a geometrical specification shall be applied to a set
of more than one geometrical feature simultaneously. Internal constraints to define the tolerance zone
pattern between the individual tolerance zones shall be defined and, if necessary, external constraints
from a datum or datum system shall also be defined.
To create a multiple indicator pattern specification, a set of more than one separate geometrical
specification shall be applied to a set of more than one geometrical feature simultaneously. Internal
constraints to define the tolerance zone pattern between the individual tolerance zones shall be defined
and, if necessary, external constraints from a datum or datum system shall also be defined.
It is possible to indicate a repetition of an identical geometrical specification, as described in ISO 1101,
to control several geometrical features.
5.4.2 Rule B: constraints
A pattern specification defines internal constraints.
A pattern specification can define external constraints when the geometrical specification includes a
datum or datum system.
The internal constraints consist of the location constraints and/or the orientation constraints linking
the individual tolerance zones composing a tolerance zone pattern.
The external constraints define the location constraints and/or the orientation constraints linking the
tolerance zone pattern to a datum or datum system.
These internal or externals constraints are defined by TEDs, which can be explicit or implicit.
The following TEDs are i
...
SLOVENSKI STANDARD
oSIST prEN ISO 5458:2015
01-september-2015
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND *36 7ROHULUDQMHJHRPHWULMH
7ROHULUDQMHSR]LFLM ,62',6
Geometrical Product Specifications (GPS) - Geometrical tolerancing - Positional
tolerancing (ISO/DIS 5458:2015)
Geometrische Produktspezifikation (GPS) - Form- und Lagetolerierung -
Positionstolerierung (ISO/DIS 5458:2015)
Spécification géométrique des produits (GPS) - Tolérancement géométrique -
Tolérancement de position et de motif (ISO/DIS 5458:2015)
Ta slovenski standard je istoveten z: prEN ISO 5458 rev
ICS:
01.100.01 7HKQLþQRULVDQMHQDVSORãQR Technical drawings in
general
17.040.30 Merila Measuring instruments
oSIST prEN ISO 5458:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 5458:2015
DRAFT INTERNATIONAL STANDARD ISO/DIS 5458
ISO/TC 213 Secretariat: DS
Voting begins on Voting terminates on
2015-06-11 2015-09-11
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
Geometrical Product Specifications (GPS) — Geometrical
tolerancing — Positional and pattern tolerancing
Spécification géométrique des produits (GPS) — Tolérancement géométrique — Tolérancement de position
et de motif
ICS 17.040.10
ISO/CEN PARALLEL PROCESSING
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Should this draft be accepted, a final draft, established on the basis of comments received, will be
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THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
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© International Organization for Standardization, 2015
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ISO/DIS 5458
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015
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Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specification modifiers and symbols . 2
5 Principles. 2
5.1 General . 2
5.2 Rules . 3
Annex A (informative) Former practice, important changes . 10
Annex B (informative) Interpretations between ISO 1101:2012 and ISO 5458:1998. 11
Annex C (informative) Examples of specification for patterns . 12
Annex D (normative) Relation to the GPS matrix model . 22
Bibliography . 23
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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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information
ISO 5458 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This third edition cancels and replaces the second edition (ISO 5458:1998), which has been technically
revised.
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Introduction
This International Standard is a geometrical product specification (GPS) standard and is to be regarded as a
general GPS standard (see ISO 14638). It influences chain links A, B and C of the chain of standards of
geometrical characteristic with or without datum or datum system.
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 apply to this document and the
default decision rules given in ISO 14253-1 apply to specifications made in accordance with this document,
unless otherwise indicated.
For more detailed information of the relation of this standard to the GPS matrix model, see Annex B.
Other relevant International Standards, such as those dealing with the least and maximum material
requirement (ISO 2692), and datum system (ISO 5459) should be taken into consideration when using this
standard.
This International Standard provides tools to describe functionalities in relation to more than one feature
considered together, and facilitate the relationship between design, manufacturing and quality services.
More information is provided in Annexes A and B, which cover changes in practice and differences between
ISO 1101:2012 and ISO 5458:1998.
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DRAFT INTERNATIONAL STANDARD ISO/DIS 5458(E)
Geometrical product specifications (GPS) — Geometrical
tolerancing — Positional and pattern tolerancing
1 Scope
This International Standard establishes complementary rules to ISO 1101 for geometrical tolerancing of form,
orientation, location or run-out. These rules are applicable when:
one geometrical specification is applied to more than one geometrical feature considered individually or
as united feature or as a pattern for GPS specification;
more than one geometrical specification is to be established simultaneously with orientation and/ or
location constraints between them.
This International standard does not cover the use of the pattern (3.1):
when the least and maximum material requirement is applied (see ISO 2692);
when a datum is established from a collection of datum features without priority between them as a
pattern (see ISO 5459).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
ISO 8015, Geometrical product specifications (GPS) — Fundamentals -- Concepts, principles and rules
ISO 17450-1, Geometrical product specifications (GPS) — General concepts — Part 1: Model for geometrical
specification and verification
ISO 17450-2, Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets,
specifications, operators, uncertainties and ambiguities
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8015, ISO 1101, ISO 17450-1,
ISO 17450-2 and the following apply.
3.1
pattern
compound feature, consisting of a set of more than one individual feature with defined nominal orientation
and/or location to each other (without priority)
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Note 1 to entry: The geometrical features composing a pattern can be compound features or a single feature, which can
be features of size (linear or angular).
Note 2 to entry: A pattern is composed by several geometrical features which either can or cannot be of the same nominal
geometry.
Note 3 to entry: A pattern does not exist when no orientation constraint or no orientation and location constraint exists
between two or more geometrical specifications of form, orientation, location or run-out.
Note 4 to entry: A pattern is qualified as:
an homogeneous pattern, when it is composed of several single features or united features, which may have the
same nominal geometry and is managed by one geometrical specification;
a non-homogeneous pattern, when it is composed of several single features or united features having more than one
nominal geometry and managed by more than one geometrical specification.
4 Specification modifiers and symbols
For the purposes of this International Standard, the following specification modifiers and symbols apply (see
Table 1).
Table 1 — Specification modifiers for linear size
Description Symbol
Combined zone CZ
Separate zones SZ
Orientation only ><
Simultaneous requirement N° i SIMi
5 Principles
5.1 General
In order to manage functional needs, the toleranced feature can be identifiedy as:
a single feature: complete or restricted;
a pattern: homogeneous or non-homogeneous.
This International Standard deals only with a pattern.
This same functional need can be applied to several toleranced features, considered independently to each
other or with constraint between them.
This pattern (homogeneous or non-homogeneous) can be constrained in orientation or in location from a
datum system.
There is no functional difference in using or not using the concept of pattern when the specifications managing
the patterns (composed by n geometrical features) use a datum system which locks all degrees of freedom of
the related tolerance zones. However, when the concept of pattern is used there is only one result of
measurement, and when the concept of pattern is not used there are n results of measurement.
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There is a functional difference in using or not using the concept of pattern when the specifications managing
the patterns (composed by n geometrical features) use a datum system which does not lock all degrees of
freedom of the related tolerance zones.
The rules, applied for repetition or pattern, are presented in 5.2 and examples with their meanings are given in
Annex C.
5.2 Rules
To create a specification on a homogeneous pattern, it is necessary to indicate that a geometrical
specification applies to a repetition of geometrical features.
To create a requirement on a non-homogeneous pattern, it is necessary to indicate that a set of more than
one geometrical specification is applied simultaneously.
The rules A to F allow expressing requirements on homogeneous and non-homogeneous pattern and their
repetition.
Rule A: Indication of repetition of application of the same specification
It is possible to indicate a repetition as described in ISO 1101, in different ways:
a) directly by using several leader lines coming from an unique tolerance indicator or by using an "all
around" symbol (see Figure 1);
b) indirectly by using:
1) nx above the tolerance indicator (see Figure 2) when no interpretation is possible for the identification
of n members;
2) nx above the tolerance indicator followed by an identifier letter (see Figure 3) when an interpretation
is possible for the identification of n members of a pattern on the workpiece. The identifier letter shall
be also indicated individually to identify each member with a leader line with a terminator (arrow or
dot).
Figure 1 — Direct indication
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Figure 2 — Indirect indication with implicit identification
Figure 3 — Indirect indication with explicit identification
Rule B: Independency between members of repetition or dependency rule for homogeneous pattern
By default, based on the independency principle defined in ISO 8015, a geometrical specification of form,
orientation, location or run-out, without modifier, applied to n geometrical features (n being greater than one),
is equivalent to n independent geometrical specifications: each geometrical feature shall be considered
individually and each specification shall be considered individually (independent between them). The resulting
independent tolerance zones correspond to an implicit indication of the SZ (separate zones) modifier: the "all
around" modifier does not create itself a united feature or a pattern.
When positional tolerancing is applied to several geometrical features and all the non-redundant degrees of
freedoms of the tolerances zones are un-locked, either the SZ (separate zones) modifier or the CZ (combined
zone) modifier shall always be indicated in the second compartment of the tolerance indicator.
NOTE This rule allows the potential conflict of interpretation between ISO 1101:2012 and the former ISO 5458:1998
to be resolved (see Annex B).
To create one homogeneous pattern, the modifier CZ shall be indicated in the tolerance section of the
tolerance indicator.
To create a new level of pattern defined as a homogeneous pattern of more than one homogeneous patterns,
an additional CZ modifier shall be indicated after the sequence defining the previous level of pattern.
EXAMPLE One CZ in the tolerance section defines a single pattern. The sequence CZ CZ CZ in the tolerance
section defines a pattern of patterns of patterns (pattern of level three).
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Between theses tolerance zones:
to manage the orientation constraints and the location constraints, the modifier CZ (combined zone) shall
be indicated, and these shall be defined by linear and angular TEDs (implicit or explicit).
to manage the orientation constraints only, the following order of modifiers CZ (combined zone) and “><”
(orientation only) shall be indicated, and these orientation constraints shall be defined by angular TEDs
(implicit or explicit).
When a geometrical symbol (form, orientation, location (e.g. position), or run-out symbol) is used in the
tolerance indicator without indication of a datum, CZ shall be indicated in the second compartment of the
tolerance indicator. This rule consolidates the general rules, to use CZ when it is necessary to create a
collection of tolerance zones with orientation and location constraints defined between them (see Figure 4 and
former practice in Annex A).
Figure 4 — Example of positional tolerancing applied to a patterns without datum
Rule C: Independency or dependency rule for non-homogeneous patterns
When the tolerance zones corresponding to several geometrical specifications indicated separately are not to
be considered independently, but with orientation and location constraints defined between them
(simultaneous requirement), then the modifier SIM, followed by a number without space if necessary, shall be
indicated close to each related geometrical specification, preferably on the free side of the tolerance indicator
(see Figures 5 and 9).
NOTE 1 The modifier SIM is not an implicit modifier: see independency principle of ISO 8015.
NOTE 2 'SIM' in ISO 8785 is used for the Surface IMperfection parameters family with some indices (e.g. a, n, t, w, cd,
ch, sh, n/A). The modifier simultaneous requirement (SIM) as indicated in this standard is not to be confused with the
indication of an imperfection surface parameter (e.g. SIM1 versus SIMt).
NOTE 3 The free side of the t
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