1、BRITISH STANDARD AEROSPACE SERIES BS EN 2945:1998 Inserts, screw thread, helical coil, self-locking Assembly procedure The European Standard EN 2945:1998 has the status of a British Standard ICS 49.030.30BSEN2945:1998 This British Standard, having been prepared under the directionof the Engineering
2、SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15August1998 BSI 04-1999 ISBN 0 580 30157 5 National foreword This British Standard is the English language version of EN2945:1998. The UK participation in its preparation was entrusted by Technical Committe
3、e ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpreta
4、tion, or proposals for change, and keep the UKinterests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which
5、implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not
6、purport to include all the necessary provisions of a 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. Summary of pages This document comprises a front cover, an inside fro
7、nt cover, pages i and ii, theEN title page, pages 2 to 6 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. Amendments issued since publication Amd. No. Date Comments
8、BSEN2945:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 2945 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2945 May 1998 ICS 49.030.30 Descriptors: Aircraft industry, screw thread, self-locking screw thread, assembling, inspection English
9、version Aerospace series Inserts, screw thread, helical coil, self-locking Assembly procedure Srie arospatiale Filets rapports, freinage interne Procdure de montage Luft- und Raumfahrt Draht-Gewindeeinstze, selbstsichernd Einbauverfahren This European Standard was approved by CEN on 23 February 1998
10、. 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 such national standards may be obtained on
11、 application 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
12、 has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European
13、Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2945:1998 EEN2945:1998 BSI 04
14、-1999 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 Associations and the Official Serv
15、ices 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 November1998, and conflicting national standards shall be withdrawn at the
16、latest by November1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, N
17、etherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Tools 3 4 Assembly of thread inserts 6 5 Inspection of installed thread inserts 6 Figure 1 3 Figure 2 3 Figure 3 4 Figure 4 4 Figure 5 5 Figure 6 5 Figure 7
18、6 Table 1 3 Table 2 4 Table 3 5 Table 4 5 Table 5 Inspection of installed thread inserts 6EN2945:1998 BSI 04-1999 3 1 Scope This standard specifies the assembly procedure (tools and inspection) for self-locking, helical coil, screw thread inserts defined by EN standards, for aerospace applications.
19、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 the publications are listed hereafter. For dated references, subsequent amendments to or revisio
20、ns 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. ISO 5855-2, Aerospace MJ threads Part2: Limit dimensions for bolts and nuts. EN 2942, Aerospace ser
21、ies Inserts, screw thread, helical coil, self-locking, in heat resisting nickel base alloy NI-PH2801 (Inconel X750), silver plated. EN 2944, Aerospace series Inserts, screw thread, helical coil, self-locking, in corrosion resisting steel FE-PA3004. EN 3542, Aerospace series Inserts, screw thread, he
22、lical coil, self-locking, in heat resisting nickel base alloy NI-PH2801 (InconelX750). 3 Tools Configuration, seeFigure 1,Figure 2, Figure 3,Figure 4,Figure 5 andFigure 6 and Table 1,Table 2,Table 3,Table 4 andTable 5. Dimensions and tolerances are in millimetres. 3.1 Manual insertion tools Of the f
23、ollowing type or equivalent Table 1 3.2 Pneumatic insertion tools Of the following type or equivalent Figure 1 Diameter code of thread insert A a B a C a 040 193 68 050 202 060 211 16 83 070 216 080 224 92 100 238 23 a Recommended envelope dimensions Figure 2 EN2945:1998 4 BSI 04-1999 3.3 Profile of
24、 insertion tool front portion and wear limit The insertion tool shall have a threaded front portion which conforms toFigure 3 orFigure 4 andTable 3. Table 2 Diameter code of thread insert D a E a F a G a 040 8 13 28 32 050 11 11 060 13 070 13 42 49 080 15 15 100 17 17 57 a Recommended envelope dimen
25、sions Figure 3 Figure 4 EN2945:1998 BSI 04-1999 5 Table 3 3.4 Tang break tool With trigger device, of the type shown or equivalent Table 4 3.5 Extraction tool Of the following type or equivalent Diameter code of thread insert H J K a L b Wear limit Wear limit nom. nom. 040 3,45 3,35 3,2 3,10 1,05 0,
26、35 050 4,4 4,3 4,1 3,95 1,2 0,4 060 5,25 5,15 4,9 4,75 1,5 0,5 070 6,25 6,15 5,9 5,75 080 7,25 7,15 6,9 6,75 100 9,1 9 8,7 8,5 1,875 0,625 a K = 1,5 pitches b L = 0,5 pitches 0 005 , 0 005 , Figure 5 Diameter code of thread insert M 1) 040 100 050 150 060 070 080 100 200 1) Recommended envelope dime
27、nsion Figure 6 EN2945:1998 6 BSI 04-1999 4 Assembly of thread inserts 4.1 The top coil of the thread insert shall be0,5 pitches to1,25 pitches below the lead in face of the installation hole (seeFigure 7). 4.2 Break off tang with tool specified in3.4 and remove the broken off tang. 5 Inspection of i
28、nstalled thread inserts They shall be below the lead in face of the installation hole by the values given in4.1. They shall accept male threads (as shown in Table 5), to the depth of the first deformed coil (length specified in product standard). Visually check that the tang has been broken off and
29、removed. The locking torque shall be checked on the actual assembly, against the values given inTable 5. Table 5 Inspection of installed thread inserts Figure 7 Diameter code of threadinsert Thread a (Associatedbolt) Min. locking torque Nm 040 MJ4 0,7-4h6h 0,16 050 MJ5 0,8-4h6h 0,3 060 MJ6 1-4h6h 0,
30、4 070 MJ7 1-4h6h 0,6 080 MJ8 1-4h6h 0,8 100 MJ10 1,25-4h6h 1,4 a In accordance with ISO5855-27 blankBS EN 2945:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on stan
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