1、CEN EbJ*:2909 95 m 3404589 OLL2Y17 638 m BRITISH STANDARD AEROSPACE SERIES Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A 286), silver-plated - Classification : 110 MPa (at ambient temperature) / 650 “C The European Standard EN 2909 : 1995 has the status of
2、a British Standard ICs 49.040.20 BS EN 2909 : 1995 CEN EN*2909 95 I 3404589 0112418 574 W . Amd.No. BS EN 2909 : 1995 Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACEY12, Aerospace fasteners and fast
3、ening systems, upon which the following bodies were represented: Association of Electronics, Telecommunications and Business Equipment British Industrial Fasteners Federation Ministsy of Defence Sociew of British Aerospace Companies Ltd. Industries This British Standard, having been prepared under t
4、he direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1995 O BSI 1995 Amendments issued since publication The following BSI references relate to the work on this standard Committee reference ACW12 Draft for comment
5、 8W6214 DC ISBN O 580 24490 3 J CEN EN*2909 95 B 3404589 OLL24L9 400 I BS EN 2909 : 1995 Contents Committees responsible Page Inside front cover National foreword i Foreword 2 Specification 1 Scope 3 2 Normative references 3 3 Required characteristics 4 Designation 5 Mxking 6 Technical specification
6、 i CEN EN*2909 95 I 340Y589 0332420 122 BS EN 2909 : 1995 National foreword This British Standard has been prepared by Technical Committee ACW12 and is the English language version of EN 2909 : 1995 Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA9
7、ZHT (A 286), silver plated - Classication : 11 O0 MPa (at ambient temperature) / 650 “C, published by the European Committee for Standardization (CEN). EN 2909 : 1995 was produced as a result of international discussions in which the United Kingdom took an active part. Cross-references There are no
8、British Standards corresponding to the European Standards referred to in the text. Publication referred to IS0 58552 : 1988 Corresponding British Standard BS 6293 Aerospace - MJ threads Part 2 : 1994 Limit dimertsions for bolts and nuts Compliance with a British Standard does not of itself confer im
9、munity from legal obligations. ii CEN EN*2707 75 1111 3YOY589 OLL242L Ob7 II EUROPEAN STANDARD NORIME EUROPENNE EuROPmC.E NOM EN 2909 July 1995 ICs 49.040.20 Descriptors: aircraft industry, hexagonal nut, seif-locking nut, heat resistant steel, silver coating, classification, surface treatment, dime
10、nsion, dimensional tolerance, designation English version Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92W (A 286), silver-plated - Classication : 1100 Mpa (at ambient temperature) / 650 “C Srie arospatiale - Luft-md Raumfahrt - crous bihexagona
11、ux, freinage interne, chambrs, en acier rsistant chaud FE-PA92HT (A 286), argents - Classification : 1100 MFa ( temprature ambiante) / 650 “C Zwlfkantmuttern, selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl FE-PA92HT (A 286), versilbert - Klasse : 1100 MPa (bei Raumtemperatur)
12、 / 650 “C (IS0 2861 : 1983) This European Standard was approved by CEN on 1995-03-18. CEN members are bound to comply with the CENICENELEC Internai Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists
13、and bibiiographicai references concerning such national standards may be obtained on application to the Centrai Secretariat or to any CEN member. This European Standard exists in three officiai versions (English, French, German). A version in any other language made by translation under the responsi
14、bility 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 standarch bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, P
15、ortugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 Copyright reserved to CEN members Ref. No. EN 2909 : 1995 E CEN ENx2909 95
16、 3404589 OLL2422 TT5 I Page 2 EN 2909 : 1995 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 successfully received the approval
17、of the National Associations 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 January 1996, and conflic
18、ting national standards shall be withdrawn at the latest by Jan- 1996. According to the CEN/CENELEC Internal Regulations, the foilowing countries are bound to implement this European Standard Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherland
19、s, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. CEN EN*2909 95 3404589 0332423 931 E . Page 3 EN 2909 : 1995 1 Scope This standard specifies the characteristics of self-locking bihexagonal nuts with deep Counterbore, in FE-PAgZHT, silver plated, for aerospace applications. Cl
20、assification : 1 100 MPa / 650 OC 21 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
21、, 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. IS0 4095 IS0 5855-2 Fasteners for aerospace construction - Bi-
22、hexagonal wrenching configuration Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts EN 2399 Heat resisting steel FE-PA92-HT - R, 2 900 MPa - Bars for forged bolts - D 5 25 mm - Aerospace series EN 2424 EN 2786 Aerospace series - Marking of aerospace products Aerospace series - El
23、ectrolytic silver plating of fasteners I EN 3004 Aerospace series - Nuts, self-lockinp, in heat resisting steel FE-PA92Hf IA2861 - Classification : 1 100 MPa I650 OC - Technical specification EN 3639 Aerospace series - Heat resisting alloy FE-PA2601 - Softened and cold worked - Wire for forged faste
24、ners - D S 15 mm - 900 MPa 5 R, 5 1 1 O0 MPa ) 3 Required characteristics 3.1 Configuration - Dimensions - Tolerances - Masses See figure 1 and table 1. Dimensions and tolerances are in millimetres. They apply after silver plating. 3.2 Materials EN 2399 or EN 3639 3.3 Surface treatment EN 2786 Thick
25、ness : - external surfaces : 5 pm to 15 pm ; - thread 2 MJ6 : 5 pm min. on thread flanks ; - thread MJ5 : shall show complete coverage, without thickness requirement. 11 Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking w
26、hen tested with a bolt of a higher Strength class. 2) Maximum test temperature of the pans 3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Prestandard at the date of publication of this standard CEN ENx2707 95 3404589 0332424 878 U M8SS Thread E F H J
27、 K L M N T Y ZsgJlOOO pans N H Code Designation max. min. max. max. min. min. min. max. i 0,2 050 MJ5x0.84H6H 5,8 5.2 7 11.5 9,l 8,3 5,7 2 9,4 4,s . 2,87 , 060 MJ6xl4H5H I 7,l 6.3 , 8 12,9 10,6 , 9.8 5.95 2,3 10,3 4,75 0.1 0.2 3,98 070 MJ7xl4H5H 8,l 7,3 9 14,l 12,l 11,3 6,2 2,6 11,l 5 4,95 O80 MJxl-
28、QHSH 9.1 I 8,3 10 15,7 113,s 12,8 6,45 2,8 12,2 5,25 6 100 MJlOx1.254H5H 11,l 10,3 12 18,5(16,8 15,8 6.7 3.1 14,3 5,s 0,13 0.3 8,84 1) In accordance with IS0 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. Page 4 EN 2909 : 1995 Values apply before silver plating.
29、Thread surface will be as achieved by normal methods of manufacture. Remove sharp edges 0,l to 0,4 Form outsf-round in this afea to achieve the self-locking fequirem 1 -em Not convex Details of form not stated are left to the manufacturers discretion. Bihexagonal configuration in accordance with IS0
30、 4095 over length M Figure 1 CEN EN*2909 95 3404589 0332425 704 I Page 5 EN 2909 : 1995 4 Designation EXAMPLE : Description block Identity block NUT 1 EN2r9-T Number of this standard Thread code (see table 1) NOTE : If necessary, the code 19005 shall be placed between the description block and the i
31、dentity block. 5 Marking EN 2424, style A, as indicated on figure 1, 6 Technical specification EN 3004 CEN ENr2909 95 IB 3404589 OLL2426 640 I BS EN 2909 : 1995 List of references See national foreword. CEN EN*ir2909 95 3404589 OLL2427 587 113 BS EN 2909 : 1995 BSI 389 Chiswick High Road London w4 4
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