1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3843:2010Aerospace series Nuts,bihexagonal, self-locking,with counterbore, in heatresisting steel, passivated Classification: 1 100 MPa (atambient temperature) / 650 CBS EN
2、 3843:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 3843:2010.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtaine
3、d on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 71362 0ICS 49.030.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This Brit
4、ish Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2010.Amendments issued since publicationDate Text affectedBS EN 3843:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3843 October 2010 ICS 49.030.30 English Version Aerospace series -
5、 Nuts, bihexagonal, self-locking, with counterbore, in heat resisting steel, passivated - Classification: 1 100 MPa (at ambient temperature) / 650 C Srie arospatiale - crous bihexagonaux, freinage interne, avec chambrage, en acier rsistant chaud, passivs - Classification : 1 100 MPa ( temprature amb
6、iante) / 650 C Luft- und Raumfahrt - Flache Zwlfkantmuttern, selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl, passiviert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 C This European Standard was approved by CEN on 30 July 2010. CEN members are bound to comply with the CEN/CE
7、NELEC 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 a
8、ny 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
9、. CEN members are the national standards bodies of 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, Sloven
10、ia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nat
11、ional Members. Ref. No. EN 3843:2010: EBS EN 3843:2010EN 3843:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Required characteristics .44 Designation 65 Marking .66 Technical specification .6BS EN 3843:2010EN 3843:2010 (E) 3 Foreword This document (EN 3843:2010) has been prepa
12、red by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countri
13、es of ASD, prior to its presentation to CEN. 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 April 2011, and conflicting national standards shall be withdrawn at the latest by April 2011. Attentio
14、n 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
15、 following countries are bound to implement 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,
16、 Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3843:2010EN 3843:2010 (E) 4 1 Scope This standard specifies the characteristics of bihexagonal self-locking nuts, with counterbore, in heat resisting steel, passivated. Classification: 1 100 MPa 1)/ 650 C 2)2 Normative ref
17、erences 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. EN 2424:2008, Aerospace series Marking of
18、 aerospace products EN 2516, Aerospace series Passivation of corrosion resisting steels and decontamination of nickel base alloys EN 9100, Quality Management Systems Requirements for Aviation, Space and Defense Organizations EN 9133, Aerospace series Quality management systems Qualification procedur
19、e for aerospace standard parts ISO 4095, Aerospace Bihexagonal drives Wrenching configuration Metric series ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 8641, Aerospace Self-locking nuts with maximum operating temperature greater than 425 C Procurement specificati
20、on ISO 8788, Aerospace Nuts, metric Tolerances of form and position TR 3791, Aerospace series Materials for self-locking nuts, threaded inserts and screw thread inserts of temperature classes 425 C 3)3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions
21、and tolerances are expressed in millimetres and apply after surface treatment. Details of form not stated are at the manufacturers option. 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a
22、higher strength class. 2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the material. 3) Published as ASD Technical Report at the date of publ
23、ication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN) (www.asd-stan.org). BS EN 3843:2010EN 3843:2010 (E) 5 3.2 Tolerances of form and position ISO 8788. 3.3 Materials TR 3791, Table 1, temperature class 425 C. 3.4 Surface treatment EN 2516, pr
24、ocess class appropriate to the material. These values in micrometres apply before surface treatment. They do not apply tothreads the surface texture of which will be as achieved by usual manufacturing methods. Remove sharp edges 0,1 to 0,4. Key 1 28 to 50 2 Thread 3 Form out-of-round in this area to
25、 achieve the self-locking torque requirement. Tooling marks are permitted in this area. 4 Marking aBihexagonal configuration in accordance with ISO 4095 over length N. bWrench pad engagement. Figure 1 1,6 6,3 BS EN 3843:2010EN 3843:2010 (E) 6 Table 1 Diameter code Thread a F G H K L M N P Mass b max
26、. max. min. min. min. min. min. 050 MJ50,8 4H6H 7 9,1 9,4 8,3 5,5 3,6 2 2,4 2,6 060 MJ61 4H5H 8 10,6 10,8 9,8 6,5 3,9 2,3 2,7 3,4 070 MJ71 4H5H 9 12,1 11,8 11,3 7,5 2,6 4,8 080 MJ81 4H5H 10 13,6 13,1 12,8 8,5 2,8 6,4 100 MJ101,25 4H5H 12 16,8 16 15,8 10,5 4,2 3,1 3 11,0 120 MJ121,25 4H5H 14 19,9 18
27、18,8 12,5 4,4 3,5 16,5 140 MJ141,5 4H5H 17 23 20,7 21,9 14,5 4,9 4 3,2 30,0 160 MJ161,5 4H5H 19 26 23,2 24,9 16,5 5,1 4,7 37,0 180 MJ181,5 4H5H 22 29,1 25,7 28 18,5 5,3 5,6 50,0 200 MJ201,5 4H5H 24 32,3 28,2 31,2 20,5 5,5 6,8 65,0 220 MJ221,5 4H5H 27 35,4 30,7 34,3 22,5 5,7 8,3 80,0 240 MJ242 4H5H 3
28、0 38 33,7 36,9 24,5 6,4 10,1 3,7 99,0 a In accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. b Approximate values (kg/1 000 pieces), given for information purposes only.4 Designation EXAMPLE Description block NUT Identity block EN3843060 Number o
29、f this standard Diameter code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424:2008, style N, see Figure 1. 6 Technical specification ISO 8641, except for: Approval of manufacturers: see EN 9100; Qualification of
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