1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 898-2:2012Mechanical properties offasteners made of carbon steeland alloy steelPart 2: Nuts with specified property classes Coarse thread and fine pitch thread (ISO898-
2、2:2012)BS EN ISO 898-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 898-2:2012. It supersedes BS EN 20898-2:1994 and BS EN ISO 898-6:1996 which are withdrawn.The UK participation in its preparation was entrusted to Technical Committee FME/9/1, Fasten
3、ers - Mechanical properties.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution
4、2012. Published by BSI Standards Limited 2012ISBN 978 0 580 70362 1 ICS 21.060.20 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2012.Amendments issued
5、 since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 898-2 April 2012 ICS 21.060.20 Supersedes EN 20898-2:1993English Version Mechanical properties of fasteners made of carbon steel and alloy steel - Part 2: Nuts with specified property classes - Coarse thread
6、 and fine pitch thread (ISO 898-2:2012) Caractristiques mcaniques des lments de fixation en acier au carbone et en acier alli - Partie 2: crous de classes de qualit spcifies - Filetages pas gros et filetages pas fin (ISO 898-2:2012) Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffs
7、tahl und legiertem Stahl - Teil 2: Muttern mit festgelegten Festigkeitsklassen - Regelgewinde und Feingewinde (ISO 898-2:2012) This European Standard was approved by CEN on 14 March 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giv
8、ing 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three off
9、icial 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 Centre has the same status as the official versions. CEN members are the national standards bodies o
10、f Austria, Belgium, Bulgaria, Croatia, 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, Turkey and United
11、 Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 898-2:2012
12、: EBS EN ISO 898-2:2012EN ISO 898-2:2012 (E) 3 Foreword This document (EN ISO 898-2:2012) 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
13、status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012. Attention is drawn to the possibility that some of the elements of this document may be
14、 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 20898-2:1993. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to imp
15、lement this European Standard: Austria, Belgium, Bulgaria, Croatia, 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, S
16、witzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 898-2:2012 has been approved by CEN as a EN ISO 898-2:2012 without any modification. BS EN ISO 898-2:2012ISO 898-2:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 23 Symbol
17、s . 24 Designation systems 24.1 Designation of nut styles 24.2 Designation of property classes . 24.3 Ranges of nominal diameters in relation to nut style and property class . 35 Design of bolt and nut assemblies . 36 Materials . 47 Mechanical properties 58 Inspection 88.1 Manufacturers inspection 8
18、8.2 Suppliers inspection . 88.3 Purchasers inspection 89 Test methods 99.1 Proof load test 99.2 Hardness test . 119.3 Surface integrity inspection .1310 Marking .1310.1 General .1310.2 Identification mark of the manufacturer 1310.3 Marking of property classes .1310.4 Identification .1410.5 Marking o
19、f left-hand thread 1510.6 Marking of packages 15Annex A (informative) Design principles of nuts .16Annex B (informative) Thread dimensions for the test mandrel 19Bibliography .21BS EN ISO 898-2:2012ISO 898-2:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide feder
20、ation 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 commit
21、tee. 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
22、 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 app
23、roval 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 898-2 was prepared by Technical Committ
24、ee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread.This third edition cancels and replaces the second edition (ISO 898-2:1992) and ISO 898-6:1994, which have been technically revised.ISO 898 consists of the following parts, under the general title Mechanical properties
25、 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 Part 2: Nuts with specified property classes Coarse thread and fine pitch thread Part 5: Set screws and similar threaded fasteners with specified ha
26、rdness classes Coarse thread and fine pitch thread Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm1)1) It is intended that, upon revision, the main element of the title of Part 7 will be aligned with the main element of the title of Part 1.iv ISO
27、2012 All rights reservedBS EN ISO 898-2:2012INTERNATIONAL STANDARD ISO 898-2:2012(E)Mechanical properties of fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes Coarse thread and fine pitch thread1 ScopeThis part of ISO 898 specifies mechanical and physical pr
28、operties of nuts with coarse thread and fine pitch thread made of carbon steel and alloy steel when tested at an ambient temperature range of 10 C to 35 C.Nuts conforming to the requirements of this part of ISO 898 are evaluated at that ambient temperature range. It is possible that they do not reta
29、in the specified mechanical and physical properties at elevated and/or lower temperatures.NOTE 1 Nuts conforming to the requirements of this part of ISO 898 have been used in applications ranging from 50 C to +150 C. It is the responsibility of users to consult an experienced fastener materials expe
30、rt for temperatures outside the range of 50 C to +150 C and up to a maximum temperature of +300C to determine appropriate choices for a given application.NOTE 2 Information for the selection and application of steels for use at lower and elevated temperatures is given for instance in EN 10269, ASTM
31、F2281 and in ASTM A320/A320M.This part of ISO 898 is applicable to nuts:a) made of carbon steel or alloy steel;b) with coarse thread M5 D M39, and fine pitch thread M81 D M393;c) with triangular ISO metric thread according to ISO 68-1;d) with diameter/pitch combinations according to ISO 261 and ISO
32、262;e) with specified property classes, including proof load;f) with different nut styles: thin nuts, regular nuts and high nuts;g) with minimum height m 0,45D;h) with a minimum outside diameter or width across flats s 1,45D (see Annex A);i) able to mate with bolts, screws and studs with property cl
33、asses according to ISO 898-1.For hot dip galvanized nuts, see ISO 10684.This part of ISO 898 does not specify requirements for properties such as: prevailing torque properties (see ISO 2320); torque/clamp force properties (see ISO 16047 for test method); weldability; corrosion resistance. ISO 2012 A
34、ll rights reserved 1BS EN ISO 898-2:2012ISO 898-2:2012(E)2 Normative referencesThe 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 (inclu
35、ding any amendments) applies.ISO 6157-2, Fasteners Surface discontinuities Part 2: NutsISO 6506-1, Metallic materials Brinell hardness test Part 1: Test methodISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test me
36、thod (scales A, B, C, D, E, F, G, H, K, N, T)ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force
37、-measuring systemISO 16426, Fasteners Quality assurance system3 SymbolsFor the purposes of this document, the following symbols apply.D nominal thread diameter of the nut, in millimetresdhhole diameter of the grip, in millimetresF load, in newtonsh thickness of the grip, in millimetresm height of th
38、e nut, in millimetresP pitch of the thread, in millimetress width across flats, in millimetres4 Designation systems4.1 Designation of nut stylesThis part of ISO 898 specifies requirements for three styles of nuts according to their height: style 2: high nut with minimum height mmin 0,9D or mmin 0,9D
39、; see Table A.1; style 1: regular nut with minimum height mmin 0,8D; see Table A.1; style 0: thin nut with minimum height 0,45D mminM16, 10 and 12 shall be quenched and tempered.Nuts with fine pitch thread and property classes 05, 6 (with D M16), 8 regular nuts (style 1), 10 and 12 shall be quenched
40、 and tempered.The chemical composition shall be assessed in accordance with the relevant International Standards.4 ISO 2012 All rights reservedBS EN ISO 898-2:2012ISO 898-2:2012(E)Table 3 SteelsThreadProperty classMaterial and nut heat treatmentChemical composition limit(cast analysis %)aCmax.Mnmin.
41、Pmax.Smax.Coarsethread04cCarbon steeld0,58 0,25 0,060 0,15005cCarbon steel, QTe0,58 0,30 0,048 0,0585bCarbon steeld0,58 0,060 0,1506bCarbon steeld0,58 0,060 0,1508 High nut (style 2) Carbon steeld0,58 0,25 0,060 0,1508 Regular nut (style 1) D M16 Carbon steeld0,58 0,25 0,060 0,1508cRegular nut (styl
42、e 1) D M16 Carbon steel, QTe0,58 0,30 0,048 0,0589 Carbon steeld0,58 0,25 0,060 0,15010cCarbon steel, QTe0,58 0,30 0,048 0,05812cCarbon steel, QTe0,58 0,45 0,048 0,058Finepitchthread04bCarbon steeld0,58 0,25 0,060 0,15005cCarbon steel, QTe0,58 0,30 0,048 0,0585bCarbon steeld0,58 0,060 0,1506bD M16 C
43、arbon steeld0,58 0,060 0,1506bD M16 Carbon steel; QTe0,58 0,30 0,048 0,0588 High nut (style 2) Carbon steeld0,58 0,25 0,060 0,1508cRegular nut (style 1) Carbon steel, QTe0,58 0,30 0,048 0,05810cCarbon steel, QTe0,58 0,30 0,048 0,05812cCarbon steel, QTe0,58 0,45 0,048 0,058QT = Quenched and tempered
44、nuts.“ No limit specified.a In case of dispute, the product analysis applies.b Nuts of these property classes may be manufactured from free-cutting steel upon agreement between the purchaser and the manufacturer; in such a case, sulfur, phosphorus and lead are permissible with the following maximum
45、contents: S: 0,34 %; P: 0,11 %; Pb: 0,35%.c Alloying elements may be added, provided the mechanical properties required in Clause 7 are fulfilled.d This may be quenched and tempered at the manufacturers discretion.eFor materials of these property classes, there shall be sufficient hardenability to e
46、nsure a structure consisting of approximately 90 % martensite in the “as-hardened” condition before tempering in the threaded area of the nut as specified in Figure 3.NOTE It is intended that national regulations for the restriction or prohibition of certain chemical elements be taken into account i
47、n the countries or regions concerned.7 Mechanical propertiesWhen tested by the methods specified in Clause 9, the nuts of the specified property class shall meet, at ambient temperature, the requirements for the proof load (see Tables 4 and 5) and for the hardness (see Tables 6 and 7), regardless of
48、 which tests are performed during manufacturing or final inspection.For nuts which are not quenched and tempered, 9.2.4.2 additionally applies. ISO 2012 All rights reserved 5BS EN ISO 898-2:2012ISO 898-2:2012(E)Table 4 Proof load values for nuts with coarse threadThreadDPitchPProof load a, NProperty
49、 class04 05 5 6 8 9 10 12M5 0,8 5 400 7 100 8 250 9 500 12 140 13 000 14 800 16 300M6 1 7 640 10 000 11 700 13 500 17 200 18 400 20 900 23 100M7 1 11 000 14 500 16 800 19 400 24 700 26 400 30 100 33 200M8 1,25 13 900 18 300 21 600 24 900 31 800 34 400 38 100 42 500M10 1,5 22 000 29 000 34 200 39 400 50 500 54 500 60 300 67 300M12 1,75 32 000 42 200 51 400 59 000 74 200 80 100 88 500 100 300M14 2 43 700 57 500 70 200 80 500 101 200 109 300 120 800 136
