1、BRITISH STANDARD AEROSPACE SERIESBS EN2856:2006Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore Classification: 1 100 MPa/235 CThe European Standard EN 2856:2006 has the status of a British StandardICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g
2、37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 2856:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48
3、554 4National forewordThis British Standard is the official English language version of EN 2856:2006. 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 o
4、n this committee can 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 us
5、ing the “Search” facility 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 f
6、rom legal obligations. 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
7、.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 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 N
8、ORME EUROPENNE EUROPISCHE NORM EN 2856 June 2006 ICS 49.030.30 English Version Aerospace series - Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore - Classification: 1 100 MPa/235 C Srie arospatiale - crous river freinage interne fixes, angle ferm, srie rduite avec c
9、hambrage - Classification : 1 100 MPa/235 C Luft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkzter Eck-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 In
10、ternal 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 application to the Central Secretariat or to any CEN mem
11、ber. 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 same status as the official versions. CEN member
12、s are the national 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
13、and United Kingdom. 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 28
14、56:2006: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Required characteristics.5 4 Designation 7 5 Marking .7 6 Technical specification .7 EN 2856:20063 Foreword This European Standard (EN 2856:2006) has been prepared by the European Association of Aerospace Manufacturers - Standa
15、rdization (AECMA-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 sh
16、all be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2006, and conflicting national standards shall be withdrawn at the latest by December 2006. Attention is drawn to the possibility that some of the elements of this
17、document may be 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 Standa
18、rd: 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 the United Kingdom. EN 2856:200
19、64 1 Scope This standard specifies requirements for closed corner, counterbored, fixed, reduced series anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round. These nuts are intended for use in aircraft assemblies, in which the fasteners are mainly objected to sh
20、ear loads. The counterbore is deep enough to accommodate a bolt shank in excess of assembly thickness, as well as the incomplete threads. They are intended to be used with threaded parts of 1 100 MPa 1)tensile strength classification. The cadmium plating restricts the application to temperature not
21、exceeding 235 C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3222,
22、 Aerospace Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 C, 1 100 MPa (at ambient temperature)/315 C and 1 100 MPa (at ambient temperature)/425 C Dimensions. ISO 5855-2, Aerospace MJ thread
23、s Part 2: Limit dimensions for bolts and nuts. ISO 5858, Aerospace Nuts, self-locking, with maximum operating temperature 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
24、specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys. EN 2424, Aerospace series Marking of aerospace 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 prevaili
25、ng torque nuts. 2)EN 2543, Aerospace series Steel FE-PL43S Annealed Sheet and strip 0,3 a 2 mm for prevailing torque nuts. 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,
26、installation and servicing (based on ISO 9001:1994). 1) This strength class applies at room temperatures. 2) Published as AECMA Prestandard at the date of publication of this standard. EN 2856:20065 3 Required characteristics 3.1 Configuration Dimensions Tolerances The configuration shall be in acco
27、rdance with Figure 1; the dimensions and tolerances shall conform to the values shown in Figure 1 and Table 1, after cadmium plating but before MoS2lubrication. The dimensions are in conformity with ISO 3222 and the geometrical tolerances with ISO 8788. Details of form not defined are at the option
28、of the manufacturer. 3.2 Surface roughness See Figure 1. Values apply prior to cadmium plating and lubrication. They do not apply to the thread, sheared edges and punched edges; the surface roughness will be as achieved by normal methods of manufacture. 3.3 Materials Steel EN 2542 or EN 2543. 3.4 Su
29、rface treatment 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 surface
30、s. EN 2856:20066 Remove sharp edges 0,1 to 0,4 Y-Y Key 1 Group of 2 holes 2,5 020,+2 Form out-of-round in this area to achieve the self-locking requirement (tooling marks permissible) 3 Pitch diameter 4 Thread 5 Applicable over a diameter equal to 2 K 6 Radius or chamfer 7 Part marking in these area
31、s Figure 1 Configuration 6,3 3,2 EN 2856:20067 Table 1 Dimensions and mass Dimensions in millimetres Thread a Code Designation E F G min.H min. J b max.K max.L max.M max.N c max. R aux. W max. Mass kg/1 000 piecesmax. 040 MJ 4 0,7 - 4H6H 6 5,5 4,4 2,2 6,2 4 12 5,8 1 2,5 10,5 1,1 050 MJ 5 0,8 - 4H6H
32、7 5,5 5,5 2,4 7,3 4,5 13,6 6,9 1 2,5 10,5 1,6 060 MJ 6 1 - 4H5H 8 5,5 6,5 2,7 8,7 5 15,7 8,1 1,2 3 11,5 2,2 aIn conformity with ISO 5855-2. In the self-locking zone, the tolerances apply before deformation. bIs to sharp corners (chamfered) or point of tangency (radiused). cIs applicable at the rivet
33、 hole location. 4 Designation Each nut shall only be designated as in the following example EXAMPLE Description block NUT, ANCHOR Identity block EN2856-060 Number of EN Standard Thread code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity
34、 block. 5 Marking Each nut shall be marked in any of the positions shown in Figure 1 in accordance with EN 2424, style N. 6 Technical specification Conforming to ISO 5858 except for quality assurance requirements See EN 9100 EN 2856:2006BS EN 2856:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British
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