EN ISO 6789:2003

SLOVENSKI STANDARD
01-september-2004
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Assembly tools for screws and nuts - Hand torque tools - Requirements and test
methods for design conformance testing, quality conformance testing and recalibration
procedure (ISO 6789:2003)
Schraubwerkzeuge - Handbetätigte Drehmoment-Werkzeuge - Anforderungen und
Prüfverfahren für die Typprüfung, Annahmeprüfung und das Rekalibrierverfahren (ISO
6789:2003)
Outils de manoeuvre pour vis et écrous - Outils dynamométriques a commande
manuelle - Exigences et méthodes d'essai pour vérifier la conformité de conception, la
conformité de qualité et la procédure de réétalonnage (ISO 6789:2003)
Ta slovenski standard je istoveten z: EN ISO 6789:2003
ICS:
25.140.30 2URGMD]DURþQRXSRUDER Hand-operated tools
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 6789
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2003
ICS 25.140.30 Supersedes EN 26789:1994
English version
Assembly tools for screws and nuts - Hand torque tools -
Requirements and test methods for design conformance testing,
quality conformance testing and recalibration procedure (ISO
6789:2003)
Outils de manoeuvre pour vis et écrous - Outils Schraubwerkzeuge - Handbetätigte Drehmoment-
dynamométriques à commande manuelle - Exigences et Werkzeuge - Anforderungen und Prüfverfahren für die
méthodes d'essai pour vérifier la conformité de conception, Typprüfung, Annahmeprüfung und das Rekalibrierverfahren
la conformité de qualité et la procédure de réétalonnage (ISO 6789:2003)
(ISO 6789:2003)
This European Standard was approved by CEN on 24 March 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6789:2003 E
worldwide for CEN national Members.

CORRECTED  2003-07-16
Foreword
This document (EN ISO 6789:2003) has been prepared by Technical Committee ISO/TC 29
"Small tools" in collaboration with CMC.
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 October 2003, and conflicting national
standards shall be withdrawn at the latest by October 2003.
This document supersedes EN 26789:1994.
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, Hungary, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and
the United Kingdom.
Endorsement notice
The text of ISO 6789:2003 has been approved by CEN as EN ISO 6789:2003 without any
modifications.
INTERNATIONAL ISO
STANDARD 6789
Third edition
2003-04-01
Assembly tools for screws and nuts —
Hand torque tools — Requirements and
test methods for design conformance
testing, quality conformance testing and
recalibration procedure
Outils de manœuvre pour vis et écrous — Outils dynamométriques à
commande manuelle — Exigences et méthodes d'essai pour vérifier la
conformité de conception, la conformité de qualité et la procédure de
réétalonnage
Reference number
ISO 6789:2003(E)
©
ISO 2003
ISO 6789:2003(E)
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ii © ISO 2003 — All rights reserved

ISO 6789:2003(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Classification. 2
5 Requirements . 2
5.1 Design conformance testing. 2
5.2 Quality conformance testing. 4
5.3 Recalibration . 4
6 Calibration. 5
6.1 Calibration device . 5
6.2 Calibration temperature. 5
6.3 Calibration conditions . 5
6.4 Calibration sequence. 8
6.5 Calibration examples . 8
7 Marking. 11
Annex A (normative) Indicating torque tools: Type I. 12
Annex B (normative) Setting torque tools: Type II. 13
Bibliography . 15

ISO 6789:2003(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 6789 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 10, Assembly
tools for screw and nuts, pliers and nippers.
This third edition cancels and replaces the second edition (ISO 6789:1992), which has been technically
revised, in particular by the addition of a new Clause 3, subclauses 5.1, 5.2 and 5.3, Figure 3 and Figure B.7.
Further, Figures 1 and 2 have been revised.
iv © ISO 2003 — All rights reserved

ISO 6789:2003(E)
Introduction
The revision of the previous edition of ISO 6789 became necessary, because the requirements of ISO 9001,
concerning the procedure of the control of test devices, as well as the introduction of calibration services,
unambiguously need guidelines in ISO 6789 for calibration and recalibration of hand torque tools.
Further, information about recalibration has been included in the present new issue.

INTERNATIONAL STANDARD ISO 6789:2003(E)

Assembly tools for screws and nuts — Hand torque tools —
Requirements and test methods for design conformance testing,
quality conformance testing and recalibration procedure
1 Scope
This International Standard specifies the requirements for, and describes the test methods and marking of,
hand torque tools used for controlled tightening of bolted connections.
It applies to torque tools in accordance with Clause 4, in particular to indicating and setting torque wrenches in
accordance with numbers 258 and 259 of ISO 1703:1983.
2 Normative references
The following referenced documents are indispensable for the application 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.
GUM, Guide for evaluation of uncertainty in measurement
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
design conformance testing
those requirements to be met during design or modification of hand torque tools (see 5.1)
3.2
quality conformance testing
those requirements to be met during manufacture of hand torque tools (see 5.2)
3.3
calibration
set of operations that establish, under specified conditions, the relationship between values of quantities
indicated by a measuring instrument or measuring system, or values represented by a material measure or a
reference material, and the corresponding values realized by standards
[VIM:1993, definition 6.11]
NOTE For the specific purposes of this International Standard, the following definition may apply:
set of operations that establish, under specified conditions, the relationship between values indicated or signalled by a
torque tool, and the corresponding values indicated by a calibration device
3.4
recalibration
those requirements to be met during calibration of hand torque tools after a defined period of use (see 5.3)
ISO 6789:2003(E)
3.5
indicating torque tool (Type I)
tool that indicates by means of a mechanical scale, dial or electronic display, the value of torque exerted by
the tool at the output drive
3.6
setting torque tool (Type II)
tool that is pre-set to a certain torque value, so that, when the prescribed value of torque is exerted by the tool
at the output drive, a signal is released (e.g. audibly, visibly, perceptibly)
3.6.1
adjustable graduated torque tool (Type II, Class A, Class D and Class G)
tool designed to be adjusted by the user, which has a scale or a display to assist adjustment
3.6.2
adjustable non-graduated tor
...