1、BRITISH STANDARD AEROSPACE SERIES BS EN3720: 1995 Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA92HT (A 286), MoS 2coated Classification: 1100MPa (at ambient temperature)/425 C The European Standard EN3720:1995 has the status of a BritishStandardBSEN 3720:1995 This BritishStandard, h
2、aving been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15September1995 BSI12-1999 The following BSI references relate to the work on this standard: Committee referenceACE/12 Draft for comment91/76461DC IS
3、BN 0 580 24097 5 Committees responsible for this British Standard The preparation of this BritishStandard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Association of Electronics, Telecommunications and Busin
4、ess Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSEN 3720:1995 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Forewor
5、d 2 1 Scope 3 2 Normative references 3 3 Required characteristics 3 4 Designation 5 5 Marking 5 6 Technical specification 5 Figure 1 4 Table 1 4 List of references Inside back coverBSEN 3720:1995 ii BSI 12-1999 National foreword This BritishStandard has been prepared by Technical CommitteeACE/12 and
6、 is the English language version of EN3720:1995, Aerospace Series Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), MoS 2coated Classification:1100MPa (at ambient temperature)/425 C, published by the European Committee for Standardization (CEN). EN3720:1995 was produced as a
7、 result of international discussions in which the UnitedKingdom took an active part. The BritishStandard corresponding to the European Standards referred to in the text are identical in number and title with those given in clause2, with the exception of EN2399, EN2491, EN3639 and EN3752, for which n
8、o corresponding BritishStandards exist. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. C
9、ross-references Publication referred to Corresponding British Standard ISO5855-2:1988 BS6293 Aerospace MJ threads Part2:1994 Limit dimensions for bolts and nuts Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, the EN title page, pages2 to6, an inside back
10、cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN3720 July1995 ICS 49.040.20 Descriptors: Aircraft industry
11、, hexagonal nut, self-locking nut, heat resistant steel, coating, classification, dimension, dimensional tolerance, designation English version Aerospace series Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA92HT(A286), MoS 2 coated Classification:1100MPa (at ambient temperature)/425
12、C Srie arospatiale crous bihexagonaux, freinage interne, en acier rsistant chaud FE-PA92HT(A286), revtus MoS 2 Classification:1100MPa ( temprature ambiante)/425 C Luft- und Raumfahrt Zwlfkantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA92HT (A286), MoS 2beschichtet Klasse:1100MPa (bei Raun
13、temperatur)/425 C This European Standard was approved by CEN on1995-03-18. 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 bibliog
14、raphical 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 responsibility of a
15、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, Portugal, Spa
16、in, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref. No. EN3720:1995EEN 3720:1995 BSI 12-1999 2 Foreword
17、 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 successively received the approval of the National Associations and the Official Service
18、s 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 January1996, and conflicting national standards shall be withdrawn at the late
19、st by January1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
20、 the UnitedKingdom.EN 3720:1995 BSI 12-1999 3 1 Scope This standard specifies the characteristics of self-locking bihexagonal nuts in FE-PA92HT, MoS 2coated, for aerospace applications. Classification:1100MPa 1) /425 C 2) 2 Normative references This European Standard incorporates by dated or undated
21、 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 these publications apply to this European Standard only when inco
22、rporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO4095, Fasteners for aerospace construction Bi-hexagonal wrenching configuration. ISO5855-2, Aerospace MJ threads Part2: Limit dimensions for bolts and nuts. EN2399, Heat resi
23、sting steel FE-PA92-HT R m U 900MPa Bars for forged bolts Dk 25mm Aerospace series 3) . EN2424, Aerospace series Marking of aerospace products. EN2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods 4) . EN3639, Aerospace series Heat resisting alloy FE-PA2601 Softened and cold
24、 worked Wire for forged fasteners Dk 15mm 900MPak R m k 1100MPa 5) . EN3752, Aerospace series Nuts, self-locking MJ threads in heat resisting steel FE-PA92HT (A286), MoS 2coated Classification:1100MPa (at ambient temperature)/425 C Technical specification 5) . 3 Required characteristics 3.1 Configur
25、ation Dimensions Tolerances Masses See Figure 1 and Table 1. Dimensions and tolerances are in millimetres. They apply before MoS 2coating. 3.2 Materials EN2399 or EN3639 3.3 Surface treatment EN2491 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperatur
26、e without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum test temperature of the parts 3) Published as AECMA Standard at the date of publication of this standard 4) In preparation at the date of publication of this standard 5) Published as AECMA Prestandard at th
27、e date of publication of this standardEN 3720:1995 4 BSI 12-1999 Table 1 Figure 1 Thread a E F H J K L M N Y Z Mass kg/1000 parts Code Designation max. min. max. max. min. min. min. max. 050 MJ50,84H6H 5,8 5,2 7 7 9,1 8,3 2 4,9 0,1 0,2 1,63 060 MJ614H5H 7,1 6,3 8 8,1 10,6 9,8 2,3 5,5 2,33 070 MJ714H
28、5H 8,1 7,3 9 9,1 12,1 11,3 1,2 2,6 6,1 3,19 080 MJ814H5H 9,1 8,3 10 10,4 13,6 12,8 2,8 6,9 4,34 100 MJ101,254H5H 11,1 10,3 12 13 16,8 15,8 3,1 8,8 0,13 0,3 7,69 120 MJ121,254H5H 13,1 12,3 14 15 19,9 18,8 1,4 3,5 10,1 14,58 140 MJ141,54H5H 15,2 14,4 17 17,5 23 21,9 1,7 4 12,6 0,15 19,79 a In accordan
29、ce with ISO5855-2. In the self-locking zone, the tolerances apply before forming out-of-round.EN 3720:1995 BSI 12-1999 5 4 Designation EXAMPLE: NOTEIf necessary, the code19005 shall be placed between the description block and the identity block. 5 Marking EN2424, style A, as indicated on Figure 1. 6
30、 Technical specification EN37526 blankBSEN 3720:1995 BSI 12-1999 List of references See national foreword.BS EN3720: 1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view o
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