1、BRITISH STANDARD AEROSPACE SERIES BS EN 2948:1997 Washers, tab, in heat resisting steel, passivated The European Standard EN 2948:1996 has the status of a British Standard ICS 49.030.99BSEN 2948:1997 This British Standard, having been prepared under the direction of the Engineering Sector Board, was
2、 published under the authority of the Standards Board and comes into effect on 15 March 1997 BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment 88/76306 DC ISBN 0 580 27146 3 Committees responsible for this British Standard The
3、preparation of this British Standard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Association of Electronics, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Mini
4、stry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBSEN2948:1997 BSI 12-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Required characteristics 3 4 Desig
5、nation 4 5 Marking 4 6 Inspection and tests 4 7 Quality assurance 4 Figure 1 3 Table 1 4 Table 2 4 List of references Inside back coverBSEN2948:1997 ii BSI 12-1998 National foreword This British Standard has been prepared by Technical Committee ACE/12 and is the English language version of EN 2948:1
6、996 Aerospace series Washers, tab, in heat resisting steel, passivated, published by the European Committee for Standardization (CEN). EN 2948:1996 was produced as a result of international discussions in which the United Kingdom took an active part. A British Standard does not purport to include al
7、l the necessary provisions of the contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN 2000:1991 BS
8、EN 2000:1992 Quality assurance EN aerospace products Approval of the quality system of manufacturers EN 2424:1995 BS EN 2424:1995 Marking of aerospace products Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 4, an inside bac
9、k cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2948 October 1996 ICS 49.040.20 Descriptors: Aircraft i
10、ndustry, lock washer, heat resistant steel, specification, dimension, dimensional tolerance, designation, inspection, test English version Aerospace series Washers, tab, in heat resisting steel, passivated Srie arospatiale Freins dcrous, en acier rsistant chaud, passivs Luft und Raumfahrt Sicherungs
11、bleche mit Lappen, aus hochwarmfestem Stahl, passiviert This European Standard was approved by CEN on 1996-08-04. 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 a
12、lteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by tra
13、nslation under the responsibility of a CEN member into its 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembo
14、urg, Netherlands, Norway, Portugal, Spain, 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 1996 Copyright reserved to CEN members Ref. No. EN 2948
15、:1996 EEN2948:1996 BSI 12-1998 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associati
16、ons and the Official Services of the member countries of AECMA, 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 April1997, and conflicting national standards shal
17、l be withdrawn at the latest by April1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembour
18、g, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN2948:1996 BSI 12-1998 3 1 Scope This standard specifies the characteristics of tab washers, in heat resisting steel, passivated, for maximum operating temperature 650 C, for aerospace applications. Their use under
19、hexagon head bolts is conditional upon the user accepting the possibility of some interference. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and
20、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN
21、2000, Aerospace series Quality assurance EN aerospace products Approval of the quality system of manufacturers. EN 2175, Heat resisting steel FE-PA93-HT Solution treated and precipitation treated Sheets and strips a 3 mm Aerospace series 1) . EN 2424, Aerospace series Marking of aerospace products.
22、EN 2516, Aerospace series Passivation of corrosion resistant steels and decontamination of nickel base alloys 1) . 3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. 3.2 Ma
23、terial EN 2175 3.3 Surface treatment EN 2516 1) Published as AECMA Standard at the date of publication of this standard Figure 1EN2948:1996 4 BSI 12-1998 Table 1 4 Designation EXAMPLE: NOTEIf necessary, the code19005 shall be placed between the description block and the identity block. 5 Marking EN
24、2424, style G 6 Inspections and tests 6.1 Appearance On visual examination, a number of tab washers, as given in Table 2, shall be free from burrs, scratches and cracks. Table 2 6.2 Bend test This test shall be carried out on 0,1 % of tab washers to be inspected, with a minimum of three parts. Assem
25、ble the tab washers under normal operating conditions. After the locking tabs have been folded and straightened twice, they shall be free from cracks. 7 Quality assurance EN 2000 Diameter code A B C E F G H J K L R 1 R 2 T Mass a H13 js13 nom. Tol. 040 4,2 7 8 4 4,4 3,4 6 1 0,5 0,05 0,2 050 5,2 8 10
26、 5 5 4 7 0,27 060 6,2 10 12 6 6 5 8 1,5 0,8 0,1 0,68 070 7,2 11 9 4,4 2,3 5 5,5 9 1,7 0,70 080 8,3 14 16 10 8 2,8 8 6,5 10,5 1,15 100 10,5 17 18 12 10 5 3,5 9 8 13 2 1 1,88 120 12,5 20 20 13 11 4 10 9 16 3 2,47 140 14,5 22 24 15 12 6 4,5 12 10,5 17 3,07 160 16,5 24 26 13 13 11,5 19 4 2,5 3,52 180 18
27、,5 27 30 16 15 5 15 12,5 21 5 4,36 200 21 30 32 18 16 7 5,5 16 14 23 6 3 5,17 a Approximate values (kg/1 000 pieces), calculated on the basis of7,85 kg/dm 3 , given for information purposes only Delivered quantity Minimum quantity to be checked 1 000 1 % with three pieces min. 1 000 2 000 15 2 000 2
28、 000 20 5 000 30BSEN2948:1997 BSI 12-1998 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
29、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal
30、 Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an in
31、accuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures
32、 that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is B
33、SI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters S
34、ervice. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial disco
35、unts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standard
36、ization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclu
37、de the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070.
