1、BSI Standards PublicationBS EN 4121:2015Aerospace series Shanknuts, serrated, self-locking, inheat resisting steel FE-PA2601(A286), silver plated on thread Classification: 1 100 MPa (atambient temperature) / 650 CBS EN 4121:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implem
2、entation of EN 4121:2015. Itsupersedes BS EN 4121:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations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 beobtained on request to its secretary.Thi
3、s publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 87603 5ICS 49.030.30Compliance with a British Standard cannot confer imm
4、unity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2015.Amendments issued since publicationDate Text affectedBS EN 4121:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4121 July 2015 ICS 49.030.30 Supe
5、rsedes EN 4121:2004English Version Aerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 C Srie arospatiale - crous dentels sertir, freinage interne, en acier rsistant chaud
6、FE-PA2601 (A286), argents sur filetage - Classification: 1 100 MPa ( temprature ambiante) / 650 C Luft- und Raumfahrt - Einnietmuttern, verzahnt, selbstsichernd, aus hochwarmfestem Stahl steel FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 C This European Standar
7、d was approved by CEN on 8 November 2014. 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 concerning su
8、ch national standards may be obtained on application to the 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 ow
9、n language and notified to the CEN-CENELEC Management Centre 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,
10、Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORM
11、UNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4121:2015 EBS EN 4121:2015EN 4121:2015 (E) 2 Contents Page European foreword .3 1 Scope 4 2 Normative referen
12、ces 4 3 Requirements characteristics 4 4 Designation 6 5 Marking .6 6 Technical specification .6 7 Installation 6 Annex A (informative) Standard evolution form 7 BS EN 4121:2015EN 4121:2015 (E) 3 European foreword This document (EN 4121:2015) has been prepared by the Aerospace and Defence Industries
13、 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 countries of ASD, prior to its presentation to CEN
14、. 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 January 2016, and conflicting national standards shall be withdrawn at the latest by January 2016. Attention is drawn to the possibility that some
15、 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 following countries are bound to imple
16、ment 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, Norway, Poland, Portugal, Romania,
17、 Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 4121:2015EN 4121:2015 (E) 4 1 Scope This standard specifies the characteristics of self-locking serrated shank nuts in FE-PA2601, silver plated on thread, for aerospace applications. Classification: 1 100 MPa 1)/ 6
18、50 C 2). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including
19、any amendments) applies. EN 2399, Aerospace series Heat resisting steel FE-PA2601 (X4NiCrTiMoV26-15) Rm 900 MPa Bars for forged bolts D 25 mm EN 2424, Aerospace series Marking of aerospace products EN 2786, Aerospace series Electrolytic silver plating of fasteners EN 3004, Aerospace series Nuts, sel
20、f-locking, MJ threads, in heat resisting steel FE-PA2601 (A286) Classification: 1 100 MPa (at ambient temperature) / 650 C Technical specification EN 3064, Aerospace series Shank nuts, self-locking, serrated Installation procedure EN 3065, Aerospace series Installation holes for self-locking, serrat
21、ed shank nuts Design standard EN 3639, Aerospace series Heat resisting alloy FE-PA2601 Softened and cold worked Wire for forged fasteners D 15 mm 900 MPa Rm 1 100 MPa 3)ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts 3 Requirements characteristics 3.1 Configuration Dimen
22、sions Tolerances Masses See Figure 1 and Table 1. Dimensions and tolerances are in millimetres. They apply after silver plating for thread surface. 3.2 Materials EN 2399 or EN 3639. 1)Correspond to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking
23、or cracking when tested with a bolt of a higher strength class. 2)Maximum test temperature of the parts. 3)Published as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). BS EN 4121:2015EN 4121:2015 (E) 5 3.3 Surface treatment EN 2786 on thread only Thickness: threa
24、d MJ6: 5 m min. on thread flanks; thread MJ5: shall show complete coverage, without thickness requirement. Coating may extend to counterbore and chamfers at manufacturers option, without thickness requirement. Values applicable before silver plating. Thread surface will be as achieved by normal meth
25、ods of manufacture. Remove sharp edges 0,1 to 0,4. Style 1 Style 2 Z Y Key 1 Thread 2 Pitch diameter 3 Form out-of-round in this area to achieve the self-locking requirement (tooling marks permissible). 4 Marking 5 Diameter P (wire) 6 Number of teeth J NOTE Configurations, style 1 or style 2, are pe
26、rmitted. Figure 1 BS EN 4121:2015EN 4121:2015 (E) 6 Table 1 ThreadaB bC D E F G H J Code Designation max. min. max. min. max. min. min. min. max. Number of teeth 050 MJ50,8-4H6H 6,3 10,1 9,8 6,8 6,1 7,38 7,15 0,9 5,12 3,3 17 060 MJ61-4H5H 7,7 11,5 11,2 8,6 7,9 8,98 8,75 1,4 6,56 3,6 20 070 MJ71-4H5H
27、 8,4 12,7 12,4 9,7 9 10,28 10,05 8,10 5 23 080 MJ81-4H5H 9,5 10 9,3 7 Code K M N Wire S U Mass cmax. min. max. max. No. P max. min. max. min. 1 Style 1 Style 2 050 6,62 6,36 7,7 7,7 3 1,0 8,730 8,639 2,4 1,6 8630 1,71 1,97 060 8,17 7,91 9,1 8,7 2 1,2 10,638 10,547 102 2,73 3,02 070 9,44 9,18 10,4 9,
28、8 3 1,5 12,536 12,445 2,9 2,1 3,46 3,84 080 10,9 3,58 4,21 aIn accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. bApplicable before forming out-of-round. cMass quoted in kg/1 000 parts. 4 Designation EXAMPLE Description block NUT Identity block E
29、N4121-080 Number of this standard Thread 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, style A, as indicated on Figure 1. 6 Technical specification EN 3004. 7 Installation The nuts shall be installed acco
30、rding to the procedure specified in EN 3064 in installation holes to EN 3065. Careful attention shall be paid to notch sensitivity of the materials in which they are to be installed. BS EN 4121:2015EN 4121:2015 (E) 7 Annex A (informative) Standard evolution form MODIFICATION REASON AND VALIDATION Be
31、fore: Figure 1 size G external. After: Figure 1 size G internal. Before: Figure 1 teeth width 14,5 min. from external side of skirt to end of teeth. After: Figure 1 teeth width 1,45 min. from beginning of teeth to flange. Before: Figure 1 key notes 1 to 10. After: Figure 1 key notes 1 to 6. Four not
32、es changed to full text. Others become: 1 Thread 2 Pitch diameter 3 Form out-of-round in this area to achieve the self-locking requirement (tooling marks permissible) 4 Marking 5 Diameter P (wire) 6 Number of teeth J This page deliberately left blankThis page deliberately left blankBSI is the nation
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