1、May 2016 English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21.060.20!%SMI“2484238www.din.deDIN
2、EN ISO 2320Fasteners Prevailing torque steel nuts Functional properties (ISO 2320:2015);English version EN ISO 2320:2015,English translation of DIN EN ISO 2320:2016-05Mechanische Verbindungselemente Muttern aus Stahl mit Klemmteil Funktionelle Eigenschaften (ISO 2320:2015);Englische Fassung EN ISO 2
3、320:2015,Englische bersetzung von DIN EN ISO 2320:2016-05Fixations crous autofreins en acier Caractristiques fonctionnelles (ISO 2320:2015);Version anglaise EN ISO 2320:2015,Traduction anglaise de DIN EN ISO 2320:2016-05SupersedesDIN EN ISO 2320:2009-03www.beuth.deDocument comprises 28 pagesDTransla
4、tion by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.04.16 DIN EN ISO 2320:2016-05 2 A comma is used as the decimal marker. National foreword This document (EN ISO 2320:2015) has been prepared by Technical Committee ISO/TC 2 “Fasteners”, Subcomm
5、ittee SC 12 “Fasteners with metric internal thread” in collaboration with Technical Committee CEN/TC 185 “Fasteners” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Mechanische Verbindungselemente (DIN Standards Committee Fasteners), Worki
6、ng Committee NA 067-00-03 AA Verbindungselemente mit metrischem Innengewinde. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 68-1 DIN ISO 68-1 ISO 261 DIN ISO 261 ISO 262 DIN ISO 262 ISO 273 DIN EN 20273 ISO 898-1 DIN EN ISO 898-1 ISO
7、898-2 DIN EN ISO 898-2 ISO 965-2 DIN ISO 965-2 ISO 16047 DIN EN ISO 16047 Amendments This standard differs from DIN EN ISO 2320:2009-3 as follows: a) the standard has been editorially revised and normative references have been updated; b) the scope of the standard has been limited to the functional
8、properties, with reference to DIN EN ISO 898-2 as regards the mechanical properties; c) prevailing torques for nuts M3 and M4 for property classes 04, 05, 5, 6 and 12 have been deleted and those for property classes 8 and 10 have been moved to Annex C; d) property class 9 has been deleted; e) the re
9、ference surface condition for the test bolt has been specified in accordance with ISO 16047; f) Figure 2 showing the torque/clamp force/angle curve has been revised; g) the determination of the prevailing-off torque has been changed from the upper value to the minimum value (new point 5 in Figure 2)
10、, which changes the acceptance conditions; h) in the test fixture, the thread protrusion through the prevailing torque feature has been changed to 3 to 5 pitches (see 9.3.4.1 and Annex A). Previous editions DIN 267-15: 1971-10, 1983-11; DIN EN ISO 2320: 1998-03, 2009-03 DIN EN ISO 2320:2016-05 3 Nat
11、ional Annex NA (informative) Bibliography DIN EN 20273, Fasteners Clearance holes for bolts and screws DIN EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch thread DIN EN
12、ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes Coarse thread and fine pitch DIN EN ISO 16047, Fasteners Torque/clamp force testing DIN ISO 68-1, ISO general purpose metric screw threads Basic profile Part 1: Metric scre
13、w threads DIN ISO 261, ISO general purpose metric screw threads General plan DIN ISO 262, ISO general purpose metric screw threads Selected sizes for screws, bolts and nuts DIN ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose external and int
14、ernal screw threads Medium quality DIN EN ISO 2320:2016-05 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2320 December 2015 ICS 21.060.20 Supersedes EN ISO 2320:2008English Version Fasteners - Prevailing torque steel nuts - Functional properties (ISO 232
15、0:2015) Fixations - crous autofreins en acier - Caractristiques fonctionnelles (ISO 2320:2015) Mechanische Verbindungselemente - Muttern aus Stahl mit Klemmteil - Mechanische und funktionelle Eigenschaften (ISO 2320:2015) This European Standard was approved by CEN on 17 October 2015. CEN members are
16、 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 t
17、he CEN-CENELEC 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-CENELEC Management Cen
18、tre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuan
19、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-100
20、0 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2320:2015 EEuropean foreword .31 Scope . 52 Normative references 53 Terms and definitions . 54 Symbols 65 Thread . 76 Lubrication . 77 Mechanical properties of pre
21、vailing torque nuts . 78 Functional requirements for prevailing torque properties 79 Test method 159.1 General 159.2 Proof load test . 159.3 Prevailing torque test . 159.3.1 General. 159.3.2 Test apparatus .169.3.3 Test parts . 169.3.4 Test procedure 179.3.5 Test report 19Annex A (normative) Tempera
22、ture influence on prevailing torques of nuts with non-metallic insert 20Annex B (informative) Principles for the evaluation of the total coefficient of friction, tot21Annex C (informative) Test clamp force and prevailing torques for prevailing torque nuts M3 and M4 in property classes 8 and 10 22Bib
23、liography .24Contents PageDIN EN ISO 2320:2016-05 EN ISO 2320:2015 (E) 2Foreword 4European foreword This document (EN ISO 2320:2015) 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.
24、 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 2016, and conflicting national standards shall be withdrawn at the latest by June 2016. Attention is drawn to the possibility that some of the
25、 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 2320:2008. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the fo
26、llowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands
27、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 2320:2015 has been approved by CEN as EN ISO 2320:2015 without any modification. DIN EN ISO 2320:2016-05 EN ISO 2320:2015 (E) 3 ForewordISO (the Inte
28、rnational 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
29、 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 s
30、tandardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in acco
31、rdance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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. Detail
32、s of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endo
33、rsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee respon
34、sible for this document is ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread.This fifth edition cancels and replaces the fourth edition (ISO 2320:2008), which has been technically revised. The following changes have been made: property class 9 has been deleted; prevailin
35、g torques for nuts M3 and M4 have been moved to Annex C; in the test fixture, the thread protrusion through the prevailing torque feature has been changed to 3 to 5 pitches; the reference surface condition for the test bolt has been specified in accordance with ISO 16047 (plain surface, uncoated and
36、 degreased, unless otherwise agreed); the determination of the prevailing-off torque has been changed from the upper value to the minimum value (new point 5 in Figure 2), which changes the acceptance conditions; other editorial revisions.DIN EN ISO 2320:2016-05 EN ISO 2320:2015 (E) 4 1 ScopeThis Int
37、ernational Standard specifies the functional properties for prevailing torque steel nuts when tested at an ambient temperature range of +10 C to +35 C. It includes a combined test method to determine the prevailing torque properties and the torque/clamp force properties at the same time.It applies t
38、o prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts: with triangular ISO thread in accordance with ISO 68-1; with diameter/pitch combination in accordance with ISO 261 and ISO 262; with coarse pitch thread M5 to M39 or with fine pitch thread M8 1 to M39 3; wit
39、h thread tolerances in accordance with ISO 965-2; with mechanical properties in accordance with ISO 898-2;Prevailing torque values specified in this standard are based on laboratory test conditions.NOTE 1 Actual prevailing torques in practical application can vary.NOTE 2 All metal type nuts conformi
40、ng to the requirements of this International Standard are used in applications ranging from 50 C to +150 C.NOTE 3 Non-metallic insert type nuts conforming to the requirements of this International Standard are used in applications ranging from 50 C to +120 C.WARNING Temperatures outside the ambient
41、temperature range can influence the functional properties (torque/clamp force and prevailing torque properties), see Annex A.2 Normative referencesThe following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated
42、 references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 273, Fasteners Clearance holes for bolts and screwsISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolt
43、s, screws and studs with specified property classes Coarse thread and fine pitch threadISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes Coarse thread and fine pitch threadISO 965-2, ISO general purpose metric screw thread
44、s Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads Medium qualityISO 16047:2005, Fasteners Torque/clamp force testing3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 16047 and the following apply.DIN EN ISO 232
45、0:2016-05 EN ISO 2320:2015 (E) 5 3.1prevailing torque nutnut which is not free-running on a mating thread by virtue of a self-contained prevailing torque feature, and which provides resistance to rotation independent of clamping or compression forces3.2prevailing torque developed by the nuttorque ne
46、cessary to rotate the nut on its mating externally threaded component and without clamp force3.3prevailing-on torquetorque to rotate the nut on its mating externally threaded component with the torque measured while the nut is in motion and without clamp force3.4prevailing-off torquetorque to rotate
47、 after backing off the nut until the removal of the clamp force in the following 360 rotation of the nut3.5prevailing torque all metal type nutnut which has a one piece or a multiple piece metal construction and derives its prevailing torque characteristics from a controlled distortion of the nut th
48、read and/or body and/or from metallic insert(s)3.6prevailing torque non-metallic insert type nutnut which has a multiple piece construction and derives its prevailing torque characteristics from insert(s) of non-metallic material retained in the nut3.7seating pointpoint in the tightening process where clamp force first appears4 SymbolsFor the purpose of this International Standard, the following symbols apply together with those defined in ISO 16047.D nominal diameter, in milli
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