1、BSI Standards PublicationBS EN 2648:2013Aerospace series Washers,concave, in alloy steel,cadmium platedBS EN 2648:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 2648:2013. Itsupersedes BS EN 2648:1995 which is withdrawn.The UK participation in its preparat
2、ion 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.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for
3、 its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 65864 8ICS 49.030.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and
4、 Strategy Committee on 31 December 2013.Amendments issued since publicationDate Text affectedBS EN 2648:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2648 December 2013 ICS 49.030.50 Supersedes EN 2648:1995English Version Aerospace series - Washers, concave, in alloy steel, cadmium plated
5、 Srie arospatiale - Rondelles concaves, en acier alli, cadmies Luft- und Raumfahrt - Scheiben, fr Neigungsausgleich, auslegiertem Stahl, verkadmet This European Standard was approved by CEN on 28 September 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
6、e 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-CENELEC Management Centre or to any CEN member. This European Stan
7、dard 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 Centre has the same status as the official versions. CEN members are the nat
8、ional 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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Sl
9、ovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any me
10、ans reserved worldwide for CEN national Members. Ref. No. EN 2648:2013 EBS EN 2648:2013EN 2648:2013 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Required characteristics .4 4 Designation 6 5 Marking .6 6 Qualification .6 BS EN 2648:2013EN 2648:2013 (E) 3 Foreword This document
11、 (EN 2648:2013) has been prepared 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
12、Services of the member countries 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 June 2014, and conflicting national standards shall be withdrawn at the l
13、atest by June 2014. Attention 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. This document supersedes EN 2648:1995. According to the CEN-CENELE
14、C Internal Regulations, the national standards organizations of the following 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, Icel
15、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 2648:2013EN 2648:2013 (E) 4 1 Scope This standard specifies the characteristics of concave washers, in alloy
16、 steel, cadmium plated, maximum operating temperature 235 C. They are intended to be used with nuts to EN 2647. 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 e
17、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2133, Aerospace series Cadmium plating of steels with specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys EN 2424, Aerospace series Marking of
18、aerospace products EN 2448, Aerospace series Steel FE-PL1503 (35CrMo4) 900 MPa Rm 1 100 MPa Bars De 40 mm EN 2542, Aerospace series Steel FE-PL1502 (25CrMo4) Annealed Bar and wire De 40 mm for prevailing torque nuts EN 2647, Aerospace series Nuts, hexagonal, self-locking, ball seat, in alloy steel,
19、cadmium plated, MoS2 lubricated Classification: 900 MPa (at ambient temperature) / 235 C EN 3330, Aerospace series Steel FE-PL1503 (35CrMo4) Annealed Bar and wire De 40 mm for prevailing torque nuts 3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions a
20、nd tolerances are expressed in millimetres and apply after surface treatment. 3.2 Materials Steel FE-PL1502 (25CrMo4), chemical composition in conformity with EN 2542, characteristics after manufacture: 1 250 MPa Rm 1 400 MPa, 40 HRC 43. Or steel FE-PL1503 (35CrMo4), chemical composition in conformi
21、ty with EN 3330 or EN 2448 or equivalent, characteristics after manufacture: 1 250 MPa Rm 1 400 MPa, 40 HRC 43. 3.3 Surface treatment EN 2133, 8 m to 14 m. BS EN 2648:2013EN 2648:2013 (E) 5 Values in micrometres apply prior to surface treatment.Remove sharp edges 0,1 to 0,4. Key 1 R spherical 2 Mark
22、ing Figure 1 Table 1 Diameter code a D1D2R S T Mass b + 0,2 0 0,2 + 0,5 0 0,1 050 7 10,3 8 2 8,5 0,8 060 8,2 13 9 2,5 9,2 1,4 080 11 17 12,5 3,5 13,25 3,3 100 13,8 21 16 4 16,9 6,5 120 16,5 24 18 5 19,5 8,9 aCorresponds to the diameter code of the nut EN 2647. bApproximate values (kg/1 000 pieces),
23、calculated on the basis of 7,85 kg/dm3, given for information purposes only. 6,3 1,6 BS EN 2648:2013EN 2648:2013 (E) 6 4 Designation EXAMPLE Description block WASHER Identity block EN2648-060 Number of this standard Diameter code (see Table 1) NOTE If necessary, the code I9005 shall be placed betwee
24、n the description block and the identity block. 5 Marking EN 2424, style F plus diameter code. See Figure 1. 6 Qualification See EN 2647. This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and se
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