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1、BS EN ISO 2320:2008 ICS 21.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Prevailing torque type steel nuts Mechanical and performance properties (ISO 2320:2008) Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:24, Unco
2、ntrolled Copy, (c) BSI This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3 2008 BSI 2008 ISBN 978 0 580 58341 4 Amendments/corrigenda issued since publication DateComments BS EN ISO 2320:2008 National foreword This British Standard is the UK im
3、plementation of EN ISO 2320:2008. It supersedes BS EN ISO 2320:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee FME/9/1, Mechanical properties of fasteners. A list of organizations represented on this committee can be obtained on request to its se
4、cretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. 1 December Licensed Copy: London South Bank University, South Bank Un
5、iversity, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2320 November 2008 ICS 21.060.20Supersedes EN ISO 2320:1997 English Version Prevailing torque type steel nuts - Mechanical and performance properties (ISO 2320:2008) crous autofreins en ac
6、ier - Caractristiques mcaniques et performances (ISO 2320:2008) Muttern aus Stahl mit Klemmteil - Mechanische und 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
7、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 Stan
8、dard 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 st
9、andards 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
10、Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2320:2008:
11、 E Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 EN ISO 2320:2008 (E) 3 Foreword This document (EN ISO 2320:2008) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collaboration with Technical Commi
12、ttee 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 b
13、y 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 In
14、ternal 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,
15、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. Licensed Copy: London South Bank University, South Bank
16、University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 ISO 2320:2008(E) ISO 2008 All rights reserved iii 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 torq
17、ue 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
18、 evaluation of the total coefficient of friction, tot. 18 Bibliography. 19 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 ISO 2320:2008(E) iv ISO 2008 All rights reserved Foreword ISO (the International Organizatio
19、n 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
20、 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. Inter
21、national 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. Publicat
22、ion 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 righ
23、ts. 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/Co
24、r.1:2006. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 INTERNATIONAL STANDARD ISO 2320:2008(E) ISO 2008 All rights reserved 1 Prevailing torque type steel nuts Mechanical and performance properties 1 Scope This I
25、nternational 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 forc
26、e 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
27、M39 and mechanical properties according to ISO 898-2; d) with fine pitch thread M81 to M393 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
28、 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, th
29、e 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 fastener
30、s 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
31、 screw threads Medium quality ISO 16047, Fasteners Torque/clamp force testing Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 ISO 2320:2008(E) 2 ISO 2008 All rights reserved 3 Terms and definitions For the purposes
32、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 clampi
33、ng 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 to
34、rque 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
35、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 it
36、s 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 defi
37、ned in ISO 16047. Symbol Designation d nominal diameter d4 diameter of the hole of the fixture FP proof load F65 lower load limit for the evaluation of the coefficient of total friction at 65 % of FP F75 upper load limit for the evaluation of the coefficient of total friction at 75 % of FP F80 test
38、clamp force (shut-down force for the tightening process) at 80 % of FP P pitch of the thread TFv prevailing-on torque, in newton metres Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 ISO 2320:2008(E) ISO 2008 All r
39、ights reserved 3 TFd prevailing-off torque, in newton metres T65 lower torque limit for the evaluation of the coefficient of total friction at F65 T75 upper torque limit for the evaluation of the coefficient of total friction at F75 T80 test torque corresponding to 80 % of the proof load, in newton
40、metres (see Tables 1 to 8) tot coefficient of total friction 5 Thread Threads for prevailing torque type nuts shall be in accordance with ISO 965-2 except for the prevailing torque feature: a) for prevailing torque non-metallic insert type nuts, the GO gauge shall be suitable for free installation (
41、by hand) until it is seated against the prevailing torque feature; b) for prevailing torque all metal type nuts, the GO gauge shall be suitable for free installation (by hand) to one pitch at least. 6 Lubrication At the option of the manufacturer a lubricant may be applied to the manufacturing lot t
42、o fulfil the performance requirements. 7 Mechanical properties of prevailing torque type nuts The mechanical properties of prevailing torque type nuts shall conform to ISO 898-2 or ISO 898-6. With regard to proof load, the test method specified in 9.2 shall apply. For prevailing torque all metal typ
43、e nuts, users should consult an experienced fastener materials expert for temperatures outside the range of 50 C to +150 C to determine appropriate choices for a given application. For prevailing torque non-metallic insert type nuts, use at or near the temperature limits of 50 C and +120 C may reduc
44、e the prevailing torque capability and may require the use of an adequate non-metallic material. Users should consult an experienced fastener materials expert for temperatures outside the range of 50 C to +120 C to determine appropriate choices for a given application. 8 Performance requirements for
45、 prevailing torque properties The prevailing-on torque shall not exceed the value specified for the applicable nut in Tables 1 to 8. The prevailing-off torque shall exceed the value specified for the applicable nut in Tables 1 to 8. For delivery inspection, the 1st installation/removal test applies,
46、 unless otherwise agreed. For initial type testing and in case of dispute, a 5th removal test shall also be applied unless otherwise agreed. Prevailing torque performance decreases as a function of the number of reuses; the consumer should take into consideration the consequences of the decreased pe
47、rformance before any reuse of the nut. By request of the customer, a temperature resistance test for prevailing torque non-metallic insert type nuts as given in Annex A may be carried out. Paragraphs 3 and 4 of Clause 7 also apply to performance requirements. Licensed Copy: London South Bank Univers
48、ity, South Bank University, 31/01/2009 03:24, Uncontrolled Copy, (c) BSI BS EN ISO 2320:2008 ISO 2320:2008(E) 4 ISO 2008 All rights reserved Table 1 Test clamp force and prevailing torques for prevailing torque type nuts of property class 04 Clamp force for evaluation of total friction coefficient t
49、ot b Prevailing torque Nm Thread d P Test clamp force F80a N Upper limit F75c N Lower limit F65d N 1st installation TFv,maxe 1st removal TFd,minf 5th removal TFd,minf M3 1 528 1 433 1 242 0,43 0,12 0,08 M4 2 672 2 505 2 171 0,9 0,18 0,12 M5 4 320 4 050 3 510 1,6 0,29 0,2 M6 6 112 5 730 4 966 3 0,45 0,3 M7 8 800 8 250 7 150 4,5 0,65 0,45 M8 11 120 10 425 9 035 M81 11 920 11 175 9 685 6 0,85 0,6 M10 17 600 16 500 14 300 M101,25 18 640 17 475 15 145 M101 19 600 18 375 15 925 10,5 1,5 1 M12 25 600 24 0
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