EN ISO 1938-2:2017

SLOVENSKI STANDARD
01-april-2017
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND*362SUHPD]DPHUMHQMHGLPHQ]LM
GHO5HIHUHQþQHPHUHGLVNRY,62
Geometrical product specifications (GPS) - Dimensional measuring equipment - Part 2:
Reference disk gauges (ISO 1938-2:2017)
Geometrische Produktspezifikation (GPS) - Längenprüftechnik - Teil 2: Prüflehren für
Rachenlehren (ISO 1938-2:2017)
Spécification géométrique des produits (GPS) - Équipement de mesurage dimensionnel -
Partie 2: Calibres de référence (ISO 1938-2:2017)
Ta slovenski standard je istoveten z: EN ISO 1938-2:2017
ICS:
17.040.30 Merila Measuring instruments
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND*36 Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 1938-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2017
EUROPÄISCHE NORM
ICS 17.040.10; 17.040.30; 17.040.40
English Version
Geometrical product specifications (GPS) - Dimensional
measuring equipment - Part 2: Reference disk gauges (ISO
1938-2:2017)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) -
Équipement de mesurage dimensionnel - Partie 2: Längenprüftechnik - Teil 2: Prüflehren für
Disques de référence pour calibres (ISO 1938-2:2017) Rachenlehren (ISO 1938-2:2017)
This European Standard was approved by CEN on 1 January 2017.

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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 1938-2:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 1938-2:2017) 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 August 2017 and conflicting national standards shall
be withdrawn at the latest by August 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
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 1938-2:2017 has been approved by CEN as EN ISO 1938-2:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 1938-2
First edition
2017-01
Geometrical product specifications
(GPS) — Dimensional measuring
equipment —
Part 2:
Reference disk gauges
Spécification géométrique des produits (GPS) — Équipement de
mesurage dimensionnel —
Partie 2: Disques de référence pour calibres
Reference number
ISO 1938-2:2017(E)
©
ISO 2017
ISO 1938-2:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 1938-2:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Design characteristics . 2
6 Metrological characteristics . 2
7 Maximum permissible limits on metrological characteristics . 3
8 Marking . 5
Annex A (informative) Material measure (reference) of the working size, WS, of a gap gauge .6
Annex B (informative) Relation to the GPS matrix model . 9
Bibliography .11
ISO 1938-2:2017(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 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: http:/// www .iso .org/ iso/
foreword .html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
A list of all parts in the ISO 1938 series can be found on the ISO website.
This document does not include requirements for setting plug gauges and setting ring gauges, which
were dealt with in ISO/R 1938:1971, 3.9.4.
This document covers the concepts and principles developed in ISO 14978.
iv © ISO 2017 – All rights reserved

ISO 1938-2:2017(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 links F and G of the size chain of standards in the general
GPS matrix. For more detailed information on the relation of this document to other standards and the
GPS matrix model, see Annex B.
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.
The terms and concepts used in this document (compared to ISO/R 1938:1971) have been changed
according to needs and terminology in the other GPS standards.
This document deals with reference disk gauges. The use of reference disk gauges is explained in
Annex A.
NOTE The content of Table 2 uses the modifiers given in ISO 14405-1 and ISO 1101.
INTERNATIONAL STANDARD ISO 1938-2:2017(E)
Geometrical product specifications (GPS) — Dimensional
measuring equipment —
Part 2:
Reference disk gauges
1 Scope
This document specifies the most important metrological and design characteristics of reference
disk gauges.
This document covers linear sizes of the gauge up to 500 mm.
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 286-1, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes —
Part 1: Basis of tolerances, deviations and fits
ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
ISO 1938-1:2015, Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1:
Plain limit gauges of linear size
ISO 14405-1, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 1: Linear sizes
ISO 17450-2, Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets,
specifications, operators, uncertainties and ambiguities
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM: 1995)
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated
terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 286-1, ISO 1938-1, ISO 14405-1,
ISO 17450-2, ISO/IEC Guide 98-3 and ISO/IEC Guide 99 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
reference disk gauge
gauge designed and intended
...