1、BRITISH STANDARD AEROSPACE SERIES BS EN 2998:1996 Washers, flat, in heat resisting steel, passivated The European Standard EN2998:1996 has the status of a BritishStandard ICS 49.040.20BSEN2998:1996 This BritishStandard, having been prepared under the directionof the Engineering SectorBoard, was publ
2、ished underthe authority of the Standards Board and comes into effect on 15June1996 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment88/76306 DC ISBN 0 580 25925 0 Committees responsible for this BritishStandard The preparation
3、 of this BritishStandard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Association of Electronic, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defen
4、ce Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBSEN2998:1996 BSI 12-1999 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 Designation 5 5 Ma
5、rking 5 6 Quality assurance 5 Figure 1 4 Table 1 4 List of references Inside back coverBSEN2998:1996 ii BSI 12-1999 National foreword This BritishStandard has been prepared by Technical Committee ACE/12 and is the English language version of EN2998:1996 Aerospace seriesWashers, flat, in heat resisti
6、ng steel, passivated, published by the European Committee for Standardization (CEN). EN2998:1996 was produced as a result of international discussions in which theUnited Kingdom took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of B
7、ritish 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 BritishStandard EN2000:1991 BS EN2000:1992 Quality assurance. EN aerospace products. Ap
8、proval of the quality system of manufacturers EN2424:1995 BS EN2424:1995 Marking of aerospace products Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see
9、 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 2998 March 1996 ICS 49.040.20 Descriptors: Aircraft industry, washer, plainwasher, heat resistant steel, dimension,
10、designation English version Aerospace seriesWashers, flat, in heat resisting steel, passivated Srie arospatialeRondelles, plates, en acier rsistant chaud, passives Luft- und RaumfahrtScheiben, flach, aus hochwarmfestem Stahl, passiviert This European Standard was approved by CEN on1995-08-31. CEN me
11、mbers 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 such national standards may be obtained on applica
12、tion to the Central Secretariat 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 own language and notified to the Central Secretariat has the
13、 same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardiz
14、ation 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 2998:1996 EEN2998:1996 BSI 12-1999 2 Foreword This European Standard has been prepared by the European Association of Aerosp
15、ace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This Euro
16、pean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September1996, and conflicting national standards shall be withdrawn at the latest by September1996. According to the CEN/CENELEC Internal Regulations, the n
17、ational standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom.EN2998:1996 BSI 12-1
18、999 3 1 Scope This standard specifies the characteristics of flat washers, in heat resisting steel, passivated, for maximum operating temperature650 C, for aerospace applications. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publicati
19、ons. These normative references are cited at the appropriate places in the text and 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. F
20、or undated references the latest edition of the publication referred to applies. EN2000, Aerospace seriesQuality assuranceEN aerospace productsApproval of the quality system of manufacturers. EN2171, Heat resisting steel FE-PA92-HTR m U 900MPaBarsAerospace series 1) . EN2175, Heat resisting steel FE
21、-PA93-HTSolution treated and precipitation treatedSheets and strips ak3mmAerospace series 1) . EN2424, Aerospace seriesMarking of aerospace products. EN2516, Aerospace seriesPassivation of corrosion resistant steels and decontamination of nickel base alloys 1) . 3 Required characteristics 3.1 Config
22、urationDimensionsMasses SeeFigure 1 and Table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. 3.2 Materials EN2171 or EN2175 3.3 Surface treatment EN2516 1) Published as AECMA Standard at the date of publication of this standardEN2998:1996 4 BSI 12-1999 T
23、able 1 Figure 1 Diameter code D 1 D 2 D 3 H S a Mass 2) H13 nom. Tol. H13 0,1 0,1 050 5,2 10,5 0,3 6,2 0,5 1,5 0,72 060 6,2 12 7,6 1,12 070 7,2 14,5 8,6 1 2 1,85 080 8,2 16 9,6 2,07 100 10,2 20,3 0,4 12 1,5 2,5 3,48 120 12,2 23,9 14,4 5,63 140 14,2 26,9 0,5 16,4 7,06 160 16,2 31,4 19,2 2 3 11,30 180
24、 18,2 34,4 21,2 13,48 200 20,3 37,4 23,2 15,80 a Includes also the flatness tolerance. 2) Approximate values (kg/1000 pieces), calculated on the basis of7,85kg/dm 3 , given for information purposes onlyEN2998:1996 BSI 12-1999 5 4 Designation EXAMPLE: NOTEIf necessary, the code19005 shall be placed b
25、etween the description block and the identity block. 5 Marking EN2424, style G 6 Quality assurance EN20006 blankBSEN2998:1996 BSI 12-1999 List of references Seenational foreword.BS EN 2998:1996 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national bo
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