EN ISO 2320:2008
(Main)Prevailing torque type steel nuts - Mechanical and performance properties (ISO 2320:2008)
Prevailing torque type steel nuts - Mechanical and performance properties (ISO 2320:2008)
ISO 2320:2008 specifies the mechanical and performance properties for prevailing torque type steel nuts when tested at an ambient temperature range of +10 °C to +35 °C. It includes a single test to determine the prevailing torque properties (performance properties) and/or the torque/clamp force properties.
ISO 2320:2008 applies to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts: a) with triangular ISO thread according to ISO 68-1; b) with diameter/pitch combination according to ISO 261 and ISO 262; c) with coarse pitch thread M3 to M39 and mechanical properties according to ISO 898-2; d) with fine pitch thread M8×1 to M39×3 and mechanical properties according to ISO 898-6; e) within the temperature range of -50 °C to +150 °C for prevailing torque all metal type nuts; f) within the temperature range of -50 °C to +120 °C for prevailing torque non-metallic insert type nuts.
ISO 2320:2008 does not apply: 1) to nuts of type e), outside the range -50 °C to +150 °C for prevailing torque all metal type nuts, when it is necessary to consult an experienced fastener materials expert to determine appropriate choices for a given application; 2) to nuts of type f), when use at or near the temperature limits can reduce the prevailing torque capability of prevailing torque non-metallic insert type nuts and can require the use of an adequate non-metallic material — it is necessary to consult an experienced fastener materials expert for temperatures outside the range -50 °C to +120 °C for prevailing torque non-metallic insert type nuts to determine appropriate choices for a given application.
Muttern aus Stahl mit Klemmteil - Mechanische und funktionelle Eigenschaften (ISO 2320:2008)
Diese Internationale Norm legt mechanische und funktionelle Eigenschaften für Muttern mit Klemmteil fest, wenn sie in einem Umgebungstemperaturbereich von + 10 °C bis + 35 °C geprüft werden. Sie enthält eine Einzelprüfung zur Bestimmung der Klemmeigenschaften (funktionelle Eigenschaften) und/oder der Drehmoment/Vorspannkraft-Eigenschaften.
Diese Internationale Norm gilt für Ganzmetallmuttern mit Klemmteil und für Muttern mit Klemmteil mit nichtmetallischem Einsatz
a) mit ISO-Gewindeprofil nach ISO 68-1;
b) mit Durchmesser/Steigungs-Kombination nach ISO 261 und ISO 262;
c) mit Regelgewinde M3 bis M39 und den mechanischen Eigenschaften nach ISO 898 2;
d) mit Feingewinde M8×1 bis M39×3 und den mechanischen Eigenschaften nach ISO 898 6;
e) im Temperaturbereich von 50 °C bis + 150 °C für Ganzmetallmuttern mit Klemmteil;
ANMERKUNG 1 Siehe Abschnitt 7, Absatz 3.
f) im Temperaturbereich von 50 °C bis + 120 °C für Muttern mit Klemmteil mit nicht¬metallischem Einsatz.
ANMERKUNG 2 Siehe Abschnitt 7, Absatz 4.
Écrous autofreinés en acier - Caractéristiques mécaniques et performances (ISO 2320:2008)
L'ISO 2320:2008 spécifie les caractéristiques mécaniques et les performances des écrous autofreinés en acier, essayés dans une plage de températures ambiantes comprises entre +10 °C et +35 °C. Elle présente un seul essai destiné à déterminer les caractéristiques d'autofreinage (caractéristiques fonctionnelles) et/ou les caractéristiques couple/tension.
L'ISO 2320:2008 s'applique aux écrous autofreinés tout métal et aux écrous autofreinés à anneau non métallique: a) à filetage triangulaire ISO conforme à l'ISO 68‑1; b) de combinaison diamètre/pas conforme à ISO 261 et à l'ISO 262; c) à filetage à pas gros M3 à M39 et avec des caractéristiques mécaniques conformes à l'ISO 898-2; d) à filetage à pas fin M8´1 à M39´3 et avec des caractéristiques mécaniques conformes à l'ISO 898-6; e) utilisés dans la plage de températures allant de -50 °C à +150 °C, pour les écrous autofreinés tout métal; f) utilisés dans la plage de températures allant de -50 °C à +120 °C, pour les écrous autofreinés à anneau non métallique.
L'ISO 2320:2008 ne s'applique pas: 1) aux écrous autofreinés tout métal lorsque les températures se situent en dehors de la plage allant de -50 °C à +150 °C; il convient dans ce cas que les utilisateurs consultent un métallurgiste expérimenté, spécialiste des éléments de fixation, afin de déterminer les choix appropriés pour une application donnée; 2) aux écrous autofreinés à anneau non métallique, lorsque l'utilisation aux limites de température de -50 °C à +120 °C, ou à des températures proches, peut réduire la capacité d'autofreinage et nécessiter l'emploi d'un matériau non métallique adéquat. Pour les écrous autofreinés à anneau non métallique, si les températures se situent en dehors de la plage allant de -50 °C à +120 °C, il convient que les utilisateurs consultent un spécialiste expérimenté dans les matériaux des éléments de fixation, afin de déterminer les choix appropriés pour une application donnée.
Jeklene samovarovalne matice - Mehanske in funkcionalne lastnosti (ISO 2320:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2009
1DGRPHãþD
SIST EN ISO 2320:2001
SIST EN ISO 2320:2001/AC:2008
Jeklene samovarovalne matice - Mehanske in funkcionalne lastnosti (ISO
2320:2008)
Prevailing torque type steel nuts - Mechanical and performance properties (ISO
2320:2008)
Muttern aus Stahl mit Klemmteil - Mechanische und funktionelle Eigenschaften (ISO
2320:2008)
Écrous autofreinés en acier - Caractéristiques mécaniques et performances (ISO
2320:2008)
Ta slovenski standard je istoveten z: EN ISO 2320:2008
ICS:
21.060.20 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 2320
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2008
ICS 21.060.20 Supersedes EN ISO 2320:1997
English Version
Prevailing torque type steel nuts - Mechanical and performance
properties (ISO 2320:2008)
Écrous autofreinés en acier - Caractéristiques mécaniques Muttern aus Stahl mit Klemmteil - Mechanische und
et performances (ISO 2320:2008) funktionelle Eigenschaften (ISO 2320:2008)
This European Standard was approved by CEN on 25 October 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2320:2008: E
worldwide for CEN national Members.
Contents Page
Foreword.3
Foreword
This document (EN ISO 2320:2008) has been prepared by Technical Committee ISO/TC 2 "Fasteners" in
collaboration with Technical Committee CEN/TC 185 “Fasteners” 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 May 2009, and conflicting national standards shall be withdrawn at the
latest by May 2009.
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.
This document supersedes EN ISO 2320:1997.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 2320:2008 has been approved by CEN as a EN ISO 2320:2008 without any modification.
INTERNATIONAL ISO
STANDARD 2320
Fourth edition
2008-11-01
Prevailing torque type steel nuts —
Mechanical and performance properties
Écrous autofreinés en acier — Caractéristiques mécaniques et
performances
Reference number
ISO 2320:2008(E)
©
ISO 2008
ISO 2320:2008(E)
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ii © ISO 2008 – All rights reserved
ISO 2320:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Symbols . 2
5 Thread . 3
6 Lubrication . 3
7 Mechanical properties of prevailing torque type nuts. 3
8 Performance requirements for prevailing torque properties . 3
9 Test method. 12
9.1 General. 12
9.2 Proof load test. 12
9.3 Prevailing torque test . 12
Annex A (normative) Temperature resistance of prevailing torque non-metallic insert type nuts . 17
Annex B (informative) Basis for the evaluation of the total coefficient of friction, µ . 18
tot
Bibliography . 19
ISO 2320:2008(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 2320 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical
properties of fasteners.
This fourth edition cancels and replaces the third edition (ISO 2320:1997), which has been technically revised.
It also incorporates the Technical Corrigendum ISO 2320:1997/Cor.1:2006.
iv © ISO 2008 – All rights reserved
INTERNATIONAL STANDARD ISO 2320:2008(E)
Prevailing torque type steel nuts — Mechanical and
performance properties
1 Scope
This International Standard specifies the mechanical and performance properties for prevailing torque type
steel nuts when tested at an ambient temperature range of +10 °C to +35 °C. It includes a single test to
determine the prevailing torque properties (performance properties) and/or the torque/clamp force properties.
This International Standard applies to prevailing torque all metal type nuts and prevailing torque non-metallic
insert type nuts:
a) with triangular ISO thread according to ISO 68-1;
b) with diameter/pitch combination according to ISO 261 and ISO 262;
c) with coarse pitch thread M3 to M39 and mechanical properties according to ISO 898-2;
d) with fine pitch thread M8×1 to M39×3 and mechanical properties according to ISO 898-6;
e) within the temperature range of −50 °C to +150 °C for prevailing torque all metal type nuts;
NOTE 1 See Clause 7, paragraph 3.
f) within the temperature range of −50 °C to +120 °C for prevailing torque non-metallic insert type nuts.
NOTE 2 See Clause 7, paragraph 4.
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 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 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general
purpose external and internal screw threads — Medium quality
ISO 16047, Fasteners — Torque/clamp force testing
ISO 2320:2008(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16047 and the following apply.
3.1
prevailing torque type nut
nut which is not free-running on a mating thread by virtue of a self-contained prevailing torque feature, and
which provides a degree of resistance to rotation independent of clamping or compression forces
3.2
prevailing torque developed by the nut
torque necessary to rotate the nut on its mating externally threaded component and with no axial force in the
mating component
3.3
prevailing-on torque
torque to rotate the nut on its mating externally threaded component with the torque measured while the nut is
in motion and with no clamp force
3.4
prevailing-off torque
torque to rotate after backing off the nut until the removal of the clamp force in the externally threaded
component in the following 360° rotation of the nut
3.5
prevailing torque all metal type nut
nut which has a one piece or a multiple piece metal construction and derives its prevailing torque
characteristics from a controlled distortion of the nut thread and/or body or from metallic insert(s)
3.6
prevailing torque non-metallic insert type nut
nut which has a multiple piece construction and derives its prevailing torque characteristics from insert(s) of
non-metallic material located and retained in the nut
3.7
seating point
point in the tightening process where clamp force first appears
4 Symbols
For the purpose of this International Standard, the following symbols apply together with those defined in
ISO 16047.
Symbol Designation
d nominal diameter
d diameter of the hole of the fixture
F proof load
P
F lower load limit for the evaluation of the coefficient of total friction at 65 % of F
65 P
F upper load limit for the evaluation of the coefficient of total friction at 75 % of F
75 P
F test clamp force (shut-down force for the tightening process) at 80 % of F
80 P
P pitch of the thread
T prevailing-on torque, in newton metres
Fv
2 © ISO 2008 – All rights reserved
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