prEN ISO 1938-1
(Main)Geometrical product specifications (GPS) - Dimensional measuring equipment - Part 1: Plain limit gauges of linear size (ISO/DIS 1938-1:2025)
Geometrical product specifications (GPS) - Dimensional measuring equipment - Part 1: Plain limit gauges of linear size (ISO/DIS 1938-1:2025)
ISO 1938-1:2015 specifies the most important metrological and design characteristics of plain limit gauges of linear size.
ISO 1938-1:2015 defines the different types of plain limit gauges used to verify linear dimensional specifications associated with linear size.
ISO 1938-1:2015 also defines the design characteristics and the metrological characteristics for these limit gauges as well as the new or wear limits state Maximum Permissible Limits (MPLs) for the new state or wear limits state for these metrological characteristics.
In addition, ISO 1938-1:2015 describes the use of limit gauges. It covers linear sizes up to 500 mm.
Geometrische Produktspezifikation (GPS) - Längenprüftechnik - Teil 1: Grenzlehren und Lehrung der Längenmaße (ISO/DIS 1938-1:2025)
Spécification géométrique des produits (GPS) - Équipement de mesure dimensionnel - Partie 1: Calibres lisses à limite de taille linéaire (ISO/DIS 1938-1:2025)
ISO 1938-1:2015 spécifie les caractéristiques métrologiques et de conception les plus importantes des calibres lisses à limites de taille linéaire.
ISO 1938-1:2015 définit les différents types de calibres lisses à limites utilisés pour vérifier les spécifications dimensionnelles linéaires associées à la taille linéaire.
ISO 1938-1:2015 définit également les caractéristiques de conception et les caractéristiques métrologiques de ces calibres à limites, ainsi que l'état neuf ou l'état limite d'usure des limites maximales tolérées (Maximum Permissible Limits, MPL) de l'état neuf ou de l'état limite d'usure de ces caractéristiques métrologiques.
ISO 1938-1:2015 décrit également l'utilisation des calibres à limites. Elle couvre les tailles linéaires jusqu'à 500 mm.
Specifikacija geometrijskih veličin izdelka (GPS) - Oprema za merjenje dimenzij - 1. del: Ploščati mejni merilniki linearne velikosti (ISO/DIS 1938-1:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2025
Specifikacija geometrijskih veličin izdelka (GPS) - Oprema za merjenje dimenzij - 1.
del: Ploščati mejni merilniki linearne velikosti (ISO/DIS 1938-1:2025)
Geometrical product specifications (GPS) - Dimensional measuring equipment - Part 1:
Plain limit gauges of linear size (ISO/DIS 1938-1:2025)
Geometrische Produktspezifikation (GPS) - Längenprüftechnik - Teil 1: Grenzlehren und
Lehrung der Längenmaße (ISO/DIS 1938-1:2025)
Spécification géométrique des produits (GPS) - Équipement de mesure dimensionnel -
Partie 1: Calibres lisses à limite de taille linéaire (ISO/DIS 1938-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 1938-1
ICS:
17.040.30 Merila Measuring instruments
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 1938-1
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Dimensional measuring
Voting begins on:
equipment —
2025-02-17
Part 1:
Voting terminates on:
2025-05-12
Plain limit gauges of linear size
Spécification géométrique des produits (GPS) — Équipement de
mesure dimensionnel —
Partie 1: Calibres lisses à limite de taille linéaire
ICS: 17.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 1938-1:2025(en)
DRAFT
ISO/DIS 1938-1:2025(en)
International
Standard
ISO/DIS 1938-1
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Dimensional measuring
Voting begins on:
equipment —
Part 1:
Voting terminates on:
Plain limit gauges of linear size
Spécification géométrique des produits (GPS) — Équipement de
mesure dimensionnel —
Partie 1: Calibres lisses à limite de taille linéaire
ICS: 17.040.40
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 2025
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
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Published in Switzerland Reference number
ISO/DIS 1938-1:2025(en)
ii
ISO/DIS 1938-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Limits .2
3.2 Gauge types .2
3.3 Characteristics and function of gauges .6
4 Abbreviated terms and symbols . 7
5 Design characteristics for gauges . 8
6 Metrological characteristics . 10
6.1 General .10
6.2 Metrological characteristic relative to the type of limit gauge (GO gauge or NO GO
gauge) .10
7 Maximum permissible limits (MPL) on metrological characteristics . 14
7.1 General .14
7.2 Values for calculation of MPL for limit gauges for internal features of size.14
7.3 Values for calculation of MPL of limit gauges for external features of size .16
7.4 Values for calculation of MPL of limit gauges .17
8 Proving conformance with specification for limit gauges .20
9 Verification of dimensional specification of a workpiece with limit gauges .20
10 Marking . .22
Annex A (informative) General principles and application of limit gauging .23
Annex B (informative) Description of the specific use of the various gauge types and the
associated uncertainty .25
Annex C (informative) Relation to the GPS matrix model .28
Bibliography .30
iii
ISO/DIS 1938-1:2025(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 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).
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 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.
This second edition cancels and replaces the first edition (ISO 1938-1:2015), which has been technically
revised.
The main changes are as follows:
— update of the definitions 3.1.3, 3.1.4, 3.2.1;
— in Clause 5 and in Tables 4 and 5, update of design and metrological characteristics of GO gauge type B to K;
— in Table B.1, inclusion of full form cylindrical ring, full form notch gauge and gap gauge.
A list of all parts in the ISO 1938 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/DIS 1938-1:2025(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 links E, F and G of the size chain of standards in the general
GPS matrix. For more detailed information of the relation of this document to other standards and the GPS
matrix model, see Annex C.
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.
This document deals with verification, using plain limit gauges, of linear sizes for features of size when the
dimensional specifications are required (see ISO 14405-1), for rigid workpieces.
NOTE Tables 4 and 5 use the modifiers given in ISO 14405-1 and ISO 1101.
v
DRAFT International Standard ISO/DIS 1938-1:2025(en)
Geometrical product specifications (GPS) — Dimensional
measuring equipment —
Part 1:
Plain limit gauges of linear size
1 Scope
This document specifies the most important metrological and design characteristics of plain limit gauges of
linear size.
This document defines the different types of plain limit gauges used to verify linear dimensional
specifications associated with linear size.
This document also defines the design characteristics and the metrological characteristics for these limit
gauges as well as the new or wear limits state maximum permissible limits (MPLs) for the new state or wear
limits state for these metrological characteristics.
In addition, this document describes the use of limit gauges. It covers linear sizes 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
...
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