EN ISO 16047:2005

SLOVENSKI STANDARD
01-maj-2005
Vezni elementi – Preskus torzijskega momenta/prednapetosti (ISO 16047:2005)
Fasteners - Torque/clamp force testing (ISO 16047:2005)
Verbindungselemente - Drehmoment/Vorspannkraft-Versuch (ISO 16047:2005)
Eléments de fixation - Essais couple/tension (ISO 16047:2005)
Ta slovenski standard je istoveten z: EN ISO 16047:2005
ICS:
21.060.01 Vezni elementi na splošno Fasteners in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 16047
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2005
ICS 21.060.01
English version
Fasteners - Torque/clamp force testing (ISO 16047:2005)
Eléments de fixation - Essais couple/tension (ISO Verbindungselemente - Drehmoment/Vorspannkraft-
16047:2005) Versuch (ISO 16047:2005)
This European Standard was approved by CEN on 17 January 2005.
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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16047:2005: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 16047:2005) has been prepared by Technical Committee ISO/TC 2
"Fasteners" in collaboration with Technical Committee CEN/TC 185 "Threaded and non-
threaded mechanical fasteners and accessories", 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 August 2005, and conflicting national
standards shall be withdrawn at the latest by August 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 16047:2005 has been approved by CEN as EN ISO 16047:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 16047
First edition
2005-02-01
Fasteners — Torque/clamp force testing
Éléments de fixation — Essais couple/tension

Reference number
ISO 16047:2005(E)
©
ISO 2005
ISO 16047:2005(E)
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ii © ISO 2005 – All rights reserved

ISO 16047:2005(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 2
4 Symbols and their designations. 3
5 Principle of test . 4
5.1 General. 4
5.2 Determination of coefficients of friction. 4
5.3 Determination of torque coefficient K (K-factor). 5
5.4 Determination of ratio T/F. 5
6 Apparatus. 5
6.1 Testing machine. 5
6.2 Test fixture. 5
7 Test parts . 6
7.1 General. 6
7.2 Test-bearing plates or test washers. 7
7.3 Test nuts for testing bolts, screws and studs. 8
7.4 Test bolts or test screws for testing nuts. 8
8 Testing under standard conditions. 9
9 Testing under specific conditions. 9
10 Evaluation of results. 9
10.1 Determination of torque coefficient K. 9
10.2 Determination of coefficient of total friction µ . 10
tot
10.3 Determination of coefficient of friction between threads µ . 10
th
10.4 Determination of coefficient of friction between bearing surfaces µ . 11
b
10.5 Determination of yield clamp force F . 11
y
10.6 Determination of yield tightening torque T . 11
y
10.7 Determination of ultimate clamp force F . 11
u
10.8 Determination of ultimate tightening torque T . 11
u
11 Test report. 11
11.1 General. 11
11.2 Description of fasteners to be tested. 12
11.3 Description of test parts. 13
11.4 Testing machine. 13
11.5 Test fixture. 14
11.6 Environmental conditions. 14
11.7 Specific conditions . 14
11.8 Test results . 14
Bibliography . 15

ISO 16047:2005(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 16047 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical
properties of fasteners.
iv © ISO 2005 – All rights reserved

INTERNATIONAL STANDARD ISO 16047:2005(E)

Fasteners — Torque/clamp force testing
1 Scope
This International Standard specifies the conditions for carrying out torque/clamp force tests on threaded
fasteners and related parts.
It is applicable, basically, to bolts, screws, studs and nuts made of carbon steel and alloy steel, whose
mechanical properties are specified in ISO 898-1, ISO 898-2 or ISO 898-6, having ISO metric threads with
thread sizes M3 to M39. It is also applicable to the combination of other externally and internally threaded
fasteners with a triangular ISO thread according to ISO 68-1.
It is not applicable to set screws and similar threaded fasteners that are not under tensile stresses, nor to
screws which form their own mating thread or threaded fasteners having additional self-locking features.
Unless otherwise agreed, the tests are carried out at room temperature. However, tests carried out under
standard conditions are made at a temperature of 10 °C to 35 °C.
This method allows determination of the tightening characteristics of threaded fasteners and related parts.
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.
ISO 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads
ISO 273:1979, Fasteners — Clearance holes for bolts and screws
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws
and studs
ISO 898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse
thread
ISO 898-6, Mechanical properties of fasteners — Part 6: Nuts with specified proof load values — Fine pitch
thread
ISO 4014, Hexagon head bolts — Product grades A and B
ISO 4017, Hexag
...