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Published 16 November 2018
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Geometrical Product
Specifications (GPS) —
Length standards —
Gauge blocks
The European Standard EN ISO 3650:1998 has the status of a
British Standard
ICS 17.040.30BS EN ISO 3650:1999
National foreword
This British Standard is the English language version of EN ISO 3650:1998. It
is identical with ISO 3650:1998. It supersedes BS 4311-1:1993 which is
The UK participation in its preparation was entrusted by Technical Committee
TDE/4, Engineering drawing, metrology, precision measurement and all
related documentation, to Subcommittee TDE/4/-/4, Engineers precision
measuring equipment including limits and fits, which has the responsibility to:
— aid enquirers to understand the text;
— present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep the UK
interests informed;
— monitor related international and European developments and
promulgate them in the UK.
A list of organizations represented on this subcommittee can be obtained on
request to its secretary.
Attention is drawn to the fact that CEN and CENELEC Standards normally
include an annex which lists normative references to international
publications with their corresponding European publications. The British
Standards which implement these international or European publications may
be found in the BSI Standards Catalogue under the section entitled
“International Standards Correspondence Index”, or by using the “Find”
facility of the BSI Standards Electronic Catalogue.
A British Standard does not purport to include all the necessary provisions of
a contract. Users of British Standards are responsible for their correct
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii,
the EN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 14,
an inside back cover and a back cover.
This standard has been updated (see copyright date) and may have had
amendments incorporated. This will be indicated in the amendment table on
the inside front cover.
This British Standard, having Amendments issued since publication
been prepared under the
direction of the Engineering
Amd. No. Date Comments
Sector Committee, was
published under the authority
of the Standards Committee
and comes into effect on
15 May 1999
© BSI 03-2000
ISBN 0 580 32485
BS EN ISO 3650:1999
National foreword Inside front cover
Foreword 2 iv
Text of ISO 3650 1
i© BSI
December 1998
ICS 17.040.30
English version
Goemetrical product specifications (GPS) — Length
standards — Gauge blocks
(ISO 3650:1998)
Spécification géométrique des produits Geometrische Produktspezifikation (GPS) —
(GPS) — Etalons de longueur — Cales-étalons Längennormale — Parallelendmaße
(ISO 3650:1998) (ISO 3650:1998)
This European Standard was approved by CEN on8 November 1998.
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 Central Secretariat 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
Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium,
CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland,
Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and United Kingdom.
European Committee for Standardization
Comité Européen de Normalisation
Europäisches Komitee für Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
© 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
Ref. No. EN ISO 3650:1998
EN ISO 3650:1998
The text of the International Standard
ISO 3650:1998 has been prepared by Technical
Committee ISO/TC 213 “Dimensional and
geometrical product specification and verification”
in collaboration with Technical Committee
CEN/TC 290 “Dimensional and geometrical product
specification and verification”, the secretariat of
which is held by DIN.
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 June 1999, and conflicting national standards
shall be withdrawn at the latest by June 1999.
According to the CEN/CENELEC Internal
Regulations, the national standards organizations
of the following countries are bound to implement
this European Standard: Austria, Belgium,
Czech Republic, Denmark, Finland, France,
Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the
United Kingdom.
Endorsement notice
The text of the International Standard
ISO 3650:1998 has been approved by CEN as a
European Standard without any modification.
NOTE Normative references to International Standards are
listed in Annex ZA (normative).
EN ISO 3650:1998
Foreword iv
Introduction 1
1 Scope 1
2 Normative references 1
3 Definitions 1
4 Nomenclature of faces 4
5 Basis of measurement, traceability, reference condition 4
5.1 Unit of length: metre 4
5.2 Traceability of the length of a gauge block 4
5.3 Reference temperature and standard pressure 4
5.4 Reference orientation of gauge blocks 5
6 General dimensions, material properties, marking 5
6.1 General dimensions 5
6.2 Material properties 5
6.2.1 Material 5
6.2.2 Coefficient of thermal expansion 6
6.2.3 Hardness 6
6.2.4 Dimensional stability 6
6.3 Marking 6
7 Metrological requirements 6
7.1 General 6
7.2 Flatness tolerance, t 7f
7.2.1 Gauge blocks with nominal lengths exceeding 2,5 mm 7
7.2.2 Gauge blocks with nominal lengths up to 2,5 mm 7
7.3 Measuring faces 7
7.4 Side faces 7
7.4.1 Flatness 7
7.4.2 Parallelism 7
7.4.3 Perpendicularity 7
7.4.4 Edges 9
8 Calibration of gauge blocks 9
8.1 General 9
8.2 Wringing test 9
8.3 Measurement by interferometry 9
8.3.1 Measured length 9
8.3.2 Auxiliary plate 9
8.3.3 Corrections to measurements by interferometry 9
8.3.4 Calibration certificate 9
8.4 Measurement by comparison 10
8.4.1 Principle of measurement 10
8.4.2 Central length 10
8.4.3 Method of determining length by comparison 10
8.4.4 Variation in length 10
8.4.5 Corrections 11
8.4.6 Calibration certificate 11
Annex A (informative) Example of a device for the
comparison of gauge blocks 12
Annex B (informative) Relation to the GPS matrix model 13
Annex C (informative) Bibliography 14

EN ISO 3650:1998
Annex ZA (normative) Normative references to
international publications with their relevant
European publications Inside back cover
Figure 1 — Central length l and another example of c
length l at any point of a gauge block wrung to the plane
surface of an auxiliary plate 2
Figure 2 — Deviation f from flatness 3d
Figure 3 — Nominal length l ; central length l ; variation n c
with f and f ; limit deviations t for the length at any point, o u e
proceeding from the nominal length 3
Figure 4 — Nomenclature of faces 4
Figure 5 — Dimensions of coupling holes in mm 5
Figure 6 — Perpendicularity deviation of side faces with a
measuring face as a datum 8
Figure 7 — Measurement of central length by comparison
taking the perpendicular distance from the centre of a
measuring face to the opposite one 10
Figure A.1 — Example of a comparator for gauge blocks of
nominal lengths up to 100 mm 12
Figure B.1 13
Table 1 — Cross section 5
Table 2 — Dimensional stability 6
Table 3 — Flatness tolerance t 7f
Table 4 — Perpendicularity tolerance 7
Table 5 — Limit deviation, t , of the length at any point of the e
measuring face from and tolerance, t , for the variation in length 8v
Descriptors: Geometrical product specifications, dimensional measurements, mechanical
measuring instruments, standard gauges, block gauges, specifications, materials specifications,
dimensions, dimensional tolerances, form tolerances, marking, calibration.
iii© BSI
EN ISO 3650:1998
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
Draft International Standards adopted by the technical committees are circulated
to the member bodies for voting. Publication as an International Standard requires
approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 3650 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 3650:1978), which
has been technically revised.
Annex A, Annex B and Annex C of this International Standard are for information
© BSI 03-2000iv