1、BRITISH STANDARD AEROSPACE SERIES BS EN 3149:1997 Shank nuts Installation holes, 60 swage, flanges Design standard The European Standard EN 3149:1996 has the status of a British Standard ICS 49.030.30BSEN3149:1997 This British Standard, having been prepared under the direction of the Engineering Sec
2、tor Board, was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment 88/71828 DC ISBN 0 580 26901 9 Committees responsible for this Briti
3、sh Standard The 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 Electronic, Telecommunications and Business Equipment Industries British Industrial Fasteners
4、Federation Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBSEN3149:1997 BSI 11-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Design 3 4 Use 3 5
5、Required characteristics 4 6 Tolerances 7 7 Assembly 7 8 Designation of installation hole 7 9 Drawing presentation 8 Figure 1 3 Figure 2 4 Figure 3 5 Figure 4 6 Figure 5 6 Figure 6 6 Figure 7 7 Figure 8 8 Figure 9 8 Table 1 4 Table 2 5BSEN3149:1997 ii BSI 11-1998 National foreword This British Stand
6、ard has been prepared by Technical Committee ACE/12 and is the English language version of EN 3149:1996 Aerospace series Shank nuts Installation holes, 60 swage, flanges Design standard, published by the European Committee for Standardization (CEN). EN 3149:1996 was produced as a result of internati
7、onal discussions in which the United Kingdom took an active part. There are no British Standards corresponding to the European Standards referred to in the text. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
8、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 front cover, pages i and ii, theEN title page, pages 2 to 8 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 theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3149 August 1996 ICS 49.040.20 Descriptors: Aircraft industry, nut, fastener, installation, design, utilization, hole
10、 size, dimensional tolerance, designation English version Aerospace series Shank nuts Installation holes, 60 swage, flanges Design standard Srie arospatiale Ecrous sertir Trous d installation, sertissage 60, brides Norme de conception Luft- und Raumfahrt Einnietmuttern Einbaulcher, 60 Aufweitung, Fl
11、ansche Konstruktionsnorm This European Standard was approved by CEN on 1996-06-29. 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
12、 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 translation under the responsibili
13、ty 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, Luxembourg, Netherlands, Norway, Portu
14、gal, 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 3149:1996 EEN3149:1996 BSI 11-1998
15、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 Services o
16、f 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 February 1997, and conflicting national standards shall be withdrawn at the lates
17、t by February 1997. 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, Luxembourg, Netherlands, Norway,
18、 Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN3149:1996 BSI 11-1998 3 1 Scope This standard specifies the dimensions of installation holes for EN-standardized 60 swage shank nuts and the relevant functional dimensions of the component flange, for aerospace applications. 2 Normative
19、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 revisions of any of
20、 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 3148, Aerospace series Shank nuts, self-locking, flange restrained Installation procedure 1) . 3 Design See
21、Figure 1. 4 Use Shank nuts are parts which are secured axially by swaging an extended shank into a countersink. The dimensions and the 60 countersink ensure that the expansion of the shank after swaging is between 10 % and 20 %, which provides adequate safety without excessive expansion. Shank nuts
22、are prevented from turning by an abutment in the component flange on one side. Due to the small abutment face of the nut, care shall be taken that the strength of the component flange is suited to the surface pressure of the shank nut during tightening of the bolt. It is recommended that the designe
23、r selects the thickness of the component flange on the basis of the minimum structural requirements, taking into consideration dimension “A” in Table 2. Shank nuts are used for bolted joints which are only accessible from one side and where bihexagonal head nuts cannot be used. The use of shank nuts
24、 in highly stressed components is not recommended since the size of the corner radius of the abutment shoulder is small and could have stress increasing characteristics. 1) Published as AECMA Prestandard at the date of publication of this standard Figure 1EN3149:1996 4 BSI 11-1998 5 Required charact
25、eristics Dimensions and tolerances in millimetres 5.1 Installation hole See Figure 2 and Table 1. Table 1 Figure 2 Nut thread B C D F Diameter code Designation min. 050 MJ50,8-4H6H 6,5 7,2 0,8 7,8 060 MJ61-4H5H 7,5 8,2 8,8 070 MJ71-4H5H 8,5 9,2 1,55 10 080 MJ81-4H5H 9,5 10,2 1,8 11,5 + 0,1 0 + 0,4 0
26、 + 0,2 0EN3149:1996 BSI 11-1998 5 5.2 Flange and abutment shoulder See Figure 3 and Table 2. Table 2 Figure 3 Nut thread A K M M 1 N R Nut dimensions Diameter code Designation min. min. 0,1 E max. a S max. a 050 MJ50,8-4H6H 2 5 See 5.2.2 See 5.2.3 2,7 1 13,25 9,6 060 MJ61-4H5H 5,5 14,25 10,6 070 MJ7
27、1-4H5H 3 6 16,25 11,6 080 MJ81-4H5H 3,5 6,5 17,25 12,6 a See the relevant product standard. + 0,2 0EN3149:1996 6 BSI 11-1998 5.2.1 Shank nuts installed on a straight line See Figure 4 and Table 2. 5.2.2 Diameter M of abutment shoulder smaller than pitch circle diameter G See Figure 5 and Table 2. 5.
28、2.3 Diameter M 1of abutment shoulder greater than pitch circle diameter G See Figure 6 and Table 2. Figure 4 Figure 5 Figure 6EN3149:1996 BSI 11-1998 7 6 Tolerances The run-out tolerances of M or M 1and the positional tolerance of B shall be derived from Figure 7. The recommended tolerances are: 7 A
29、ssembly EN 3148 8 Designation of installation hole EXAMPLE: Run-out tolerance of M or M 1 : 0,1 Positional tolerance of B: 0,2 Figure 7EN3149:1996 8 BSI 11-1998 9 Drawing presentation 9.1 Installation hole EXAMPLE: see Figure 8. Alternatively, the hole may be fully dimensioned on the drawing. 9.2 In
30、stalled nut EXAMPLE: see Figure 9. Figure 8 Figure 99 blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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