1、BRITISH STANDARD AEROSPACE SERIESBS EN2754:2006Nuts, anchor, self locking, two lug, floating with counterbore Classification: 1 100 MPa/235 CThe European Standard EN 2754:2006 has the status of a British StandardICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g
2、48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 2754:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2006 BSI 2006ISBN 0 580 48400 9National forewor
3、dThis British Standard is the official English language version of EN 2754:2006. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the responsibility to: A list of organizations represented on this committee can
4、be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” faci
5、lity of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations
6、. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis
7、 document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD
8、NORME EUROPENNE EUROPISCHE NORM EN 2754 April 2006 ICS 49.030.30 English Version Aerospace series - Nuts, anchor, self locking, two lug, floating with counterbore - Classification: 1 100 MPa/235 C Srie arospatiale - crous river freinage interne flottants, double patte avec chambrage - Classification
9、 : 1 100 MPa/235 C Luft- und Raumfahrt - Gehuse-Annietmuttern, selbstsichernd, beweglich, beiderseitiger Flansch mit zylindrischer Aussenkung - Klasse: 1 100 MPa/235 C This European Standard was approved by CEN on 9 March 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
10、s 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 application to the Central Secretariat or to any CEN member. This Europea
11、n 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 same status as the official versions. CEN members are the nationa
12、l standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdo
13、m. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2754:2006: E2 Conte
14、nts Page Foreword 3 1 Scope .4 2 Normative references .4 3 Required characteristics 5 4 Designation .8 5 Marketing.8 6 Technical specification.8 EN 2754:20063 Foreword This European Standard (EN 2754:2006) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AE
15、CMA-STAN). After enquiries 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 of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given
16、the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2006, and conflicting national standards shall be withdrawn at the latest by October 2006. Attention is drawn to the possibility that some of the elements of this document may be
17、 the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Be
18、lgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 2754:20064 1 Scope This
19、 standard specifies the characteristics of two lug, counterbored, floating anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, the dimensions of which are in conformity with ISO 3209. These nuts are intended for use in aircraft assemblies, in which the fasten
20、ers are mainly subjected to shear loads. The counterbore of nuts with thread diameter equal to or greater than 4 mm is deep enough to accommodate a bolt shank in excess of assembly thickness, as well as the incomplete threads. The 3 mm diameter nut has no counterbore. They are intended to be used wi
21、th threaded parts of 1 100 MPa 1)tensile strength classification. The cadmium plating restricts the application to temperatures not exceeding 235 C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the editio
22、n cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3209, Aerospace Nuts, anchor, self-locking, floating, two lug, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature )/235 C, 1 100 MPa (at a
23、mbient temperature )/315 C and 1 100 MPa (at ambient temperature)/425 C Dimensions. ISO 5855-1, Aerospace MJ threads Part 1: General requirements. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. ISO 5858, Aerospace Nuts, self-locking, with maximum operating temperature
24、less than or equal to 425 C Procurement specification. ISO 8788, Aerospace Nuts, metric Tolerances of form and position. EN 2133, Aerospace series Cadmium plating of steels with specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys. EN 2424, Aerospace series Marking of aerosp
25、ace products. EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods. EN 2542, Aerospace series Steel FE-PL43S Annealed Bar and wire De 40 mm for prevailing torque nuts. 2)EN 2543, Aerospace series Steel FE-PL43S Annealed Sheet and strip 0,3 a 2 mm for prevailing torque nuts.
26、 2)EN 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems Model for quality assurance in design, development, production, installation and servicing (based on ISO 9001:1994). 1) This strength class applies at room temperatures. 2) Published as
27、AECMA Prestandard at the date of publication of this standard. EN 2754:20065 3 Required characteristics 3.1 Configuration Dimensions Tolerances The configuration shall be in accordance with Figure 1; the dimensions and tolerances shall conform to the values shown in Figure 1 and Table 1, before cadm
28、ium plating and MoS2lubrication. 3.2 Surface roughness See Figure 1. The values apply before cadmium plating and MoS2lubrication. They do not apply to the thread, sheared-off edges and punched holes obtained by common manufacturing processes. 3.3 Materials Steel EN 2542 or EN 2543. 3.4 Surface treat
29、ment Cadmium plating EN 2133, 5 m minimum on the threads and all areas which can be contacted by a 20 mm diameter ball. On all other areas, a continuous deposit shall be present, but no minimum value is specified. Lubrication by MoS2EN 2491, mandatory on threads, optional on other surfaces. EN 2754:
30、20066 Break sharp edges 0,1 mm to 0,4 mm Float included Section Y-Y Detail X Optional: dimped rivet holes Key 1 2 holes S 020,+; Plain rivet holes 2 Cage 3 Part marking in these areas 4 Pitch 5 Threads 6 Applicable over a diameter equal to the width of the threaded element 7 Form out-of-round in thi
31、s area to achieve the self-locking torque requirement (tool marks permissible) 8 Threaded element 9 Radius or chamfer 10 2 holes S 040,+; Dimpled rivet holes aFor inspection requirements, see Clause 6. Details of form, not stated, are at the manufacturers option. Figure 1 Configuration 6,3 0,8 EN 27
32、54:20067 Table 1 Dimensions Dimensions in millimetres Diamtre code Thread aE F G min. H min. J b max. K max. L max. M max. 030 MJ 3 0,50 4H 6H 8,5 17 c c 4,6 11 23,2 4 040 MJ 4 0,70 4H 6H 8,5 17 4,4 2,2 6,2 11 23,2 5,8 050 MJ 5 0,80 4H 6H 9,5 19 5,5 2,4 7,3 12 25,2 6,9 060 MJ 6 1,00 4H 5H 11 22 6,5
33、2,7 8,7 13,5 29,2 8,1 080 MJ 8 1,00 4H 5H 11 22 8,5 2,7 10,9 16 29,2 9,9 100 MJ 10 1,25 4H 5H 13 26 10,5 3 12,9 18 35,2 12 Diamtre code N d max. P min. R aux. S T max. U V 0,25 Z Radial float min. Mass kg/1 000 piecesmax. 030 0,9 4,5 3 2,5 4,5 0,15 4,8 0,5 1,8 040 0,9 5,5 3 2,5 4,5 0,15 4,8 0,5 2 05
34、0 0,9 6,5 3 2,5 4,5 0,18 4,8 0,7 2,3 060 0,9 7,5 3,5 2,5 4,6 0,18 4,8 0,7 3,8 080 1,1 9,5 3,5 3 5,5 0,20 5,7 0,75 7,3 100 1,1 11,5 4,5 3,5 6 0,23 6,6 0,75 10 Tolerances of form and position are in conformity with ISO 8788. aIn conformity with ISO 5855 parts 1 and 2. In the self-locking zone, the tol
35、erances apply before deformation. b J is to be measured at sharp corners (chamfered) or point of tangency (radiused) cThe 3 mm diameter nut does not include a counterbore. dDimension N is the lug thickness at the rivet hole location. EN 2754:20068 4 Designation Each nut shall only be designated as i
36、n the following example. EXAMPLE Description block NUT, ANCHOR Identity block EN2754060 Number of EN Standard Hole code (see Table 2) Thread code (see Table 1) Table 2 Option Hole code Plain rivet holes Dimpled rivet holes K NOTE If necessary, the code I9005 shall be placed between the description b
37、lock and the identity block. 5 Marketing Each nut shall be marked in any of the positions shown on Figure 1 in accordance with EN 2424, Style F. 6 Technical specification Conforming to ISO 5858 except for quality assurance requirements See EN 9100. EN 2754:2006blankBS EN 2754:2006BSI389 Chiswick Hig
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