1、BRITISH STANDARD AEROSPACE SERIES BS EN 2881:2006 Nuts, anchor, self-locking, fuel resistant, sealing, floating, two lug, with counterbore, in corrosion resisting steel, passivated, MoS2 lubricated Classification: 900 MPa (at ambient temperature) / 120 C The European Standard EN 2881:2006 has the st
2、atus of a British Standard ICS 49.030.30BS EN 2881:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006 ISBN 0 580 48529 3 National foreword This British Standard is the official English language version of EN 2881:2006.
3、 The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or
4、proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement inter
5、national 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” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purp
6、ort 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. Summary of pages This document comprises a front cover, an inside front cover, the EN title page
7、, 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 publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN2881 May2006 ICS49.030.30 EnglishVersion AerospaceseriesNuts,an
8、chor,selflocking,fuelresistant, sealing,floating,twolug,withcounterbore,incorrosionresisting steel,passivated,MoS2lubricatedClassification:900MPa(at Sriearospatialecrousriver,freinageinterne, tanchesaucarburant,flottants,doublepatte,avec chambrage,enacierrsistantlacorrosion,passivs, lubrifisMoS2,sri
9、emtriqueClassification:900MPa( LuftundRaumfahrtAnnietmuttern,selbstsichernd, druckdicht,kraftstoffbestnding,beweglich,beiderseitiger Flansch,mitzylindrischerAussenkung,aus korrosionsbestndigemStahl,passiviert,MoS2geschmiert ThisEuropeanStandardwasapprovedbyCENon6February2006. CENmembersareboundtocom
10、plywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropean
11、Standardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,Cze
12、chRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Romania, Slovakia,Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCH
13、ESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2006CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN2881:2006:E ambienttemperature)/120C tempratureambiante)/120C Klasse:900MPa(beiRaumtemperatur)/120CEN 2881:2006 2 Contents Page For
14、eword 3 1 Scope .4 2 Normative references .4 3 Required characteristics 5 4 Designation .7 5 Marking 7 6 Technical specification.7 EN 2881:2006 3 Foreword This European Standard (EN 2881:2006) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). Af
15、ter 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 the status of
16、 a national standard, either by publication of an identical text or by endorsement, at the latest by November 2006, and conflicting national standards shall be withdrawn at the latest by November 2006. Attention is drawn to the possibility that some of the elements of this document may be the subjec
17、t 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, Belgium, Cypr
18、us, 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. 4 1 Scope This standard specifies the
19、 characteristics of self-locking, fuel resistant, sealing, floating, two lug anchor nuts, with counterbore, in corrosion resisting steel, passivated, MoS 2lubricated, metric series. Classification: 900 MPa 1) / 120 C 2)2 Normative references The following referenced documents are indispensable for t
20、he 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 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. ISO 5858, Aerospace Nuts, sel
21、f-locking, with maximum operating temperature less than or equal to 425 C Procurement specification. ISO 8788, Aerospace Nuts, metric Tolerances of form and position. ISO 8940, Aerospace Nuts, anchor, self-locking, sealing, floating, two-lug, with counterbore, with MJ threads, classifications: 900 M
22、Pa (at ambient temperature)/120 C, 900 MPa (at ambient temperature)/175 C and 900 MPa (at ambient temperature)/235 C Dimensions. EN 2424, Aerospace series Marking of aerospace products. EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods. EN 2516, Aerospace series Passivat
23、ion of corrosion resisting steels and decontamination of nickel base alloys. 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 9001:19
24、94). EN 9133, Aerospace series Quality management systems Qualification Procedure for aerospace standard parts. MIL-R-6855E, Rubber, synthetic, sheets, strips, molded or extruded shapes, general specification for. 3)TR 3791, Aerospace series Materials for self-locking nuts, threaded inserts and scre
25、w thread inserts of temperature classes 425 C. 4)1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the nut is able to withstand, without p
26、ermanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the seal material. 3) Published by: Department of Defense (DoD), the Pentagon, Washington, D.C. 20301, USA. 4) Published as AECMA Technical Report at the date o
27、f publication of this standard. EN 2881:20065 3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions and tolerances are: in conformity with ISO 8940, expressed in millimetres and apply after surface treatment but before MoS 2lubrication. Details of form n
28、ot stated are at the manufacturers option. 3.2 Tolerances of form and position See ISO 8788. 3.3 Materials Cage, seal retainer and nut element: TR 3791 Sealing ring: rubber, fuel resistant per MIL-R-6855, class 1, grade 60 or equivalent. 3.4 Surface treatments Cage and seal retainer: EN 2516 Nut ele
29、ment: EN 2491, thickness not specified, mandatory on threads, optional on other surfaces EN 2881:20066 These values in micrometres apply before surface treatment. They do not apply to threads, punched holes or sheared edges the surface texture of which will be as achieved by usual manufacturing meth
30、ods. Remove sharp edges 0,1 to 0,4. Key 1 Threaded element anti-rotational device (form at manufacturers discretion) 2 Marking 3 Choice of flange at manufacturers option 4 Two holes S 5 Cage 6 Seal 7 Seal retainer 8 Nut element. Minimum radial float of nut element: 0,5 9 Form-out-round in this area
31、to achieve the self-locking torque requirement (tooling marks permissible) 10 Thread aMaximum bolt thread intrusion bLug thickness at the rivet location Figure 1 6,3 3,2 EN 2881:20067 Table 1 Thread a E F G H J K L M Q S W Mass b Diameter code min. min. max. max. max. max. max. + 0,2 0 max.050 MJ5x0
32、,8-4H6H 9,5 19 6 3,4 16,214,4 24,67,912,5 14,4 4,3 060 MJ6x1-4H5H 11 22 7 19,217 29 9,516 2,5 17,4 7 080 MJ8x1-4H5H 13 26 9 4,1 20,3 19,4 32,5 11,3 18,5 3 18,5 10 aIn accordance with ISO 5855-2. In the self-locking zone the tolerances apply before forming out-of-round. bApproximate values (kg/1 000
33、pieces), given for information purposes only. 4 Designation EXAMPLE Description block NUT Identity block EN2881-060 Number of this standard Diameter code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style N.
34、See Figure 1. 6 Technical specification ISO 5858, except for: Approval of manufacturers: see EN 9100; Qualification of products: see EN 9133. EN 2881:2006BS EN 2881:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for pr
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