BS-EN-ISO-2320-1998.pdf
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1、BRITISH STANDARD BS EN ISO 2320:1998 Incorporating corrigendum no. 1 Prevailing torque type steel hexagon nuts Mechanical and performance properties ICS 21.060.20 ? Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:40:56 GMT+00:00 2008, Uncontrolled Copy, (c) B
2、SI BS EN ISO 2320:1998 This British Standard was published under the authority of the Standards Board and comes into effect on 15 May 1998 BSI 2008 ISBN 978 0 580 61007 3 National foreword This British Standard is the UK implementation of EN ISO 2320:1997, incorporating corrigendum November 2007. It
3、 is identical with ISO 2320:1997, incorporating corrigendum September 2006. It partially supersedes BS 4929-1:1973 which is declared obsolescent. The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by ISO corrigendum September 2006 is indi
4、cated in the text by . The UK participation in its preparation was entrusted by Technical Committee FME/9, Bolts, nuts and accessories, to Subcommittee FME/9/10, Male and female prevailing torque fasteners. A list of organizations represented on this subcommittee can be obtained on request to its se
5、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. Amendments/corrigenda issued since publication DateComments 31 Januar
6、y 2008Implementation of ISO corrigendum September 2006 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:40:56 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2320 November 1997 ICS 21.060 Descriptors: See ISO
7、 document English version Prevailing torque type steel hexagon nuts Mechanical (ISO 2320:1997) Ecrous hexagonaux autofreins en acier Caractristiques mcaniques et performances (ISO 2320:1997) Sechskantmuttern aus Stahl mit Klemmteil Mechanische und funktionelle Eigenschaften (ISO 2320:1997) This Euro
8、pean Standard was approved by CEN on 23 October 1997. 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 c
9、oncerning 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
10、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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
11、Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nation
12、al Members. Ref. No. EN ISO 2320:1997 E and performance properties Incorporating corrigendum November 2007 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:40:56 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN ISO 2320:1997 2 Foreword The text of the Internation
13、al Standard ISO 2320:1997 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
14、a national standard, either by publication of an identical text or by endorsement, at the latest by May 1998, and conflicting national standards shall be withdrawn at the latest by May 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun
15、tries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International St
16、andard ISO 2320:1997 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). Contents Page Foreword2 1 Scope1 2 Normative references1 3 Definitions2 3.1 Prevailing torque type nut2 3.2 Prevailing tor
17、que developed by a nut2 4 Designation system2 5 Materials and processes2 5.1 Materials2 5.2 Heat treatment3 5.2.1 Nuts with coarse thread 3 5.2.2 Nuts with fine pitch thread3 5.3 Thread3 5.4 Finish3 5.5 Hydrogen embrittlement3 6 Mechanical properties3 7 Performance requirements10 7.1 Prevailing torq
18、ue10 7.2 Torque/clamping force10 7.3 Tempering resistance of prevailing torque type nuts with non-metallic insert10 8 Test methods10 8.1 Proof load test10 8.1.1 Test bolt for proof load test10 8.1.2 Hardened mandrel for proof load test10 8.2 Hardness test10 8.3 Prevailing torque test10 8.3.1 Test pr
19、ogramme10 8.3.2 Torque measuring device11 8.3.3 Clamping force measuring device11 8.3.4 Test bolt for torque testing11 8.3.5 Test washer11 9 Marking12 Annex A (normative) Recommended testing technique using manual torque wrenches to determine torque performance characteristics of prevailing torque t
20、ype steel hexagon nuts13 Annex B (normative) Tempering resistance test for prevailing torque type nuts with non-metallic insert14 Annex C (informative) Torque/clamping force requirements and testing14 BSI 2008 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:4
21、0:56 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN ISO 2320:1997 3 Page Annex ZA (normative) Normative references to international publications with their relevant European publications18 Figure A.1 Clamping force measuring device13 Table 1 Designation system for nuts with nominal heights 0,8 d2 Tab
22、le 2 Designation system and stresses under proof load for nuts with nominal heigths 0,5 d and 0,8 d (effective lengths of thread 0,6 d) are designated by a number to indicate the maximum appropriate property class of bolts with which they may be mated, see Table 1; nuts with nominal heights 0,5 d an
23、d 0,4 d and 0,8 d Table 2 Designation system and stresses under proof load for nuts with nominal heigths 0,5 d and M16), 10 and 12 shall be quenched and tempered. Case hardening is not allowed for any property class. 5.2.2 Nuts with fine pitch thread Nuts of property classes 05, 8 (style 1), 10 and
24、12 shall be quenched and tempered. Case hardening is not allowed for any property class. 5.3 Thread The thread of the prevailing torque type nuts must conform to ISO 965-2 except for the prevailing torque element. In the case of prevailing torque type nuts with non-metallic insert, the go gauge must
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