1、BS EN 4620:2010ICS 49.030.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Inserts, MJ threads,self-locking, with selfbroaching keys Design standardThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommitt
2、ee on 30 April2010 BSI 2010ISBN 978 0 580 56030 9Amendments/corrigenda issued since publicationDate CommentsBS EN 4620:2010National forewordThis British Standard is the UK implementation of EN 4620:2010.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fas
3、teners and fastening systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard c
4、annot confer immunityfrom legal obligations.BS EN 4620:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4620 March 2010 ICS 49.030.30 English Version Aerospace series - Inserts, MJ threads, self-locking, with self-broaching keys - Design standard Srie arospatiale - Douilles filetes, filetage
5、 MJ, freinage interne, clavettes auto-brochantes - Norme de conception Luft- und Raumfahrt - Gewindeeinstze, MJ-Gewinden, selbstsichernd, mit selbstrumenden Stiften - Konstruktionsnorm This European Standard was approved by CEN on 9 January 2010. CEN members are bound to comply with the CEN/CENELEC
6、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 bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN
7、 member. 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 CEN Management Centre has the same status as the official versions. CEN
8、members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Sp
9、ain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
10、Members. Ref. No. EN 4620:2010: EBS EN 4620:2010EN 4620:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Design .44 Use 54.1 General 54.2 Performance .54.3 Installation restrictions .65 Required characteristics Installation hole .76 Installation 97 Provisions for component salva
11、ge 98 Designation 99 Indication on drawings 99.1 Methods of drawing .99.2 Examples of definition drawing . 109.3 Example of assembly drawing 11BS EN 4620:2010EN 4620:2010 (E) 3 Foreword This document (EN 4620:2010) has been prepared by the Aerospace and Defence Industries Association of Europe - Sta
12、ndardization (ASD-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 ASD, prior to its presentation to CEN. This European Standard sha
13、ll be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. Attention is drawn to the possibility that some of the elements of this
14、 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 Stand
15、ard: Austria, Belgium, Bulgaria, Croatia, 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
16、Kingdom. BS EN 4620:2010EN 4620:2010 (E) 4 1 Scope This standard specifies the applications and installation hole dimensions for EN standard, self-locking, self-broaching key, MJ thread inserts and provisions for component salvage, for aerospace applications. 2 Normative references The following ref
17、erenced 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. EN 4619, Aerospace series Inserts, MJ threads, self-locking, with
18、self-broaching keys Installation and removal procedure EN 4621, Aerospace series Inserts, MJ threads, self-locking, self-broaching keys Technical specification ISO 5855-1, Aerospace MJ threads Part 1: General requirements ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts 3
19、 Design NOTE Typical examples of installed inserts are shown in Figures 1 and 2. 3.1 The threaded self-locking inserts may be used in tapped blind holes and tapped through holes. The minimum flange thickness dimensions K given in Tables 3 to 5 are less than the insert length. When using these minimu
20、m flange thicknesses, protrusion of the inserts will occur (see Figure 5, footnote a). Designers shall therefore ensure that the inserts do not protrude into an abutment face or foul any other adjacent features. 3.2 The installed insert is compatible with MJ threaded bolts to ISO 5855-2. 3.3 The min
21、imum selected bolt length shall ensure full thread engagement with the insert (see Figures 1 and 2). 3.4 These screw thread inserts may be used in aluminium alloys and in harder materials, such as heat resistant steels and titanium alloys. 3.5 During the design of the fitted flange, overall dimensio
22、ns of the tools shall be taken into account as specified in EN 4619. BS EN 4620:2010EN 4620:2010 (E) 5 Key a 1,5 pitches minimum Key a 1,5 pitches minimum Figure 1 Figure 2 4 Use 4.1 General A self-locking, self-broaching key insert as shown in Figure 3 is a sleeve of metal, which is threaded both,
23、internally and externally, with two or more self-broaching keys. These inserts are screwed into tapped holes (see 5.1) and are fixed by broaching the keys into the thread of the component (see Figures 1 and 2) thus preventing the insert moving during the installation or removal of a bolt. The self-l
24、ocking zone of these inserts is positioned at the opposite side from the key side. Key a Keys to be broached into the thread of the parent component b Formed out-of-round to achieve self-locking feature Figure 3 4.2 Performance The inserts according to EN 4621 have a minimum performance of 25 re-use
25、s at ambient temperature and five re-uses after baking at the maximum operating temperature given on the product standard. The self-locking torque values for the inserts are given in Table 1. These are the values required to achieve the minimum re-usability performance at ambient temperature in acco
26、rdance with the technical specification of the inserts. BS EN 4620:2010EN 4620:2010 (E) 6 Table 1 Bolt thread diameter Self-locking torque Nm min. max. MJ50,8 0,25 2 MJ61 0,35 3,2 MJ71 0,5 4,6MJ81 0,65 6 MJ101,25 1,2 9,5 4.3 Installation restrictions In applications where it is necessary to pass ite
27、ms through the installed insert, care shall be taken to ensure that such items do not foul the locking feature of the insert. The maximum diameter X that can be passed through the insert is illustrated in Figure 4 and dimensions are given in Table 2. Figure 4 Table 2 Dimensions in millimetres Bolt t
28、hread diameter Diameter X max. MJ50,8 3,2 MJ61 3,7 MJ71 4,5 MJ81 5,3 MJ101,25 6,7 BS EN 4620:2010EN 4620:2010 (E) 7 5 Required characteristics Installation hole See Figure 5 and Tables 3 to 6. Dimensions in millimetres Key 1 Pitch diameter 2 Boss diameter aK allows total installation of the threaded
29、 part of the insert with 0,75 mm under-flush max. The locking feature of the insert may protrude. b L min. K + 5 pitches. Allows automatic tapping. Figure 5 Table 3 Codified dimensions of holes for normal size inserts Dimensions in millimetres Diameter code Bolt thread diameter a, bInstallation hole
30、 diameter aA K L +0,2 min. min. 0 050-0 MJ50,8 MJ91-4H5H 10 7,5 14 060-0 MJ61 MJ101-4H5H 11 9 16,5 070-0 MJ71 MJ111-4H5H 12 10,5 18 080-0 MJ81 MJ121-4H5H 13 12 20 100-0 MJ101,25 MJ141-4H5H 15 14,5 23 aAccording to ISO 5855-1. bAccording to ISO 5855-2. BS EN 4620:2010EN 4620:2010 (E) 8 Table 4 Codifi
31、ed dimensions of holes for first repair size inserts Dimensions in millimetres Diameter code Bolt thread diameter a,b Thread hole thread diameter aA K L +0,2 min. min. 0 050-1 MJ50,8 MJ101-4H5H 11 7,5 14 060-1 MJ61 MJ111-4H5H 12 9 16,5 070-1 MJ71 MJ121-4H5H 13 10,5 18 080-1 MJ81 MJS131-4H5H 14 12 20
32、 100-1 MJ101,25 MJ151-4H5H 16 14,5 23 aAccording to ISO 5855-1. bAccording to ISO 5855-2 except MJS131 (see EN 4619). Table 5 Codified dimensions of holes for second repair size inserts Dimensions in millimetres Diameter code Bolt thread diameter a,b Thread hole thread diameter aA K L +0,2 min. min.
33、 0 050-2 MJ50,8 MJ111-4H5H 12 7,5 14 060-2 MJ61 MJ121-4H5H 13 9 16,5 070-2 MJ71 MJS131-4H5H 14 10,5 18 080-2 MJ81 MJ141-4H5H 15 12 20 100-2 MJ101,25 MJ161-4H5H 17 14,5 23 aAccording to ISO 5855-1. bAccording to ISO 5855-2 except MJS131 (see EN 4619). Table 6 Minimal dimensions for bosses Dimensions
34、in millimetres Without provision for repair With provision for one repair With provision for two repairs Bolt thread diameter E a min. G b min. E amin. G bmin. E amin. G bmin. MJ50,8 4,6 15,3 4,9 17 5,3 18,7 MJ61 4,9 17 5,3 18,7 5,7 20,4 MJ71 5,3 18,7 5,7 20,4 6,0 22,1 MJ81 5,7 20,4 6,0 22,1 6,5 23,
35、8 MJ101,25 6,4 23,8 6,8 25,5 7,2 27,2 aE min. allows a minimum thickness equal to about 1,5 mm. bG min. allows a minimum diameter equal to about 1,7 times the nominal installation thread diameter. BS EN 4620:2010EN 4620:2010 (E) 9 6 Installation According to EN 4619. Inserts shall be installed betwe
36、en 0,25 mm and 0,75 mm below the surface of the component. 7 Provisions for component salvage When inserts are selected for a design, consideration shall be given to the feasibility of component salvage, where the original hole could be damaged during the manufacture, or where the hole is machined o
37、ut of the position. Before provision is made for component salvage, consideration shall be given to component cost/mass requirements, e.g. for an inexpensive component salvage may not be an economic proposition, where as an expensive component may necessitate salvage. Where provision for salvage is
38、made, the component will be heavier, because of the increase in wall thickness around the tapped holes. In the event of component salvage action, hole preparation, repair size insert selection and installation shall be in accordance with EN 4619. 8 Designation EXAMPLE Description block INSERT Identi
39、ty block EN4620-050-0 Number of this standard Diameter code (see Tables 3 to 5) NOTE The last digit corresponds to: Size code: 0 = Normal size; 1 = First repair size; 2 = Second repair size. 9 Indication on drawings 9.1 Methods of drawing Installation hole can be indicated on design drawing in three
40、 different manners given hereafter: A use of standard codification of holes given in chapter “Designation“; B use of standard codification of holes given in chapter “Designation“ amended on drawing by different requirements; C give all dimensions and tolerances of the hole and boss on the drawing. N
41、OTE Above method A is recommended. In case of boss, it shall be dimensioned on the drawing. BS EN 4620:2010EN 4620:2010 (E) 10 CAUTION It is important to check that the bolt does not interfere with the bottom of the hole notably when method A is used. In case of possible interference method B or C a
42、bove shall be used. With method A, the drilling maximal depth is not limited; it cannot assume minimum thickness of material. 9.2 Examples of definition drawing See Figures 6 to 8 for design with boss. Dimensions in millimetres Dimensions in millimetres Dimensions in millimetres Key 1 Hole to EN 462
43、0-060-0 Key 1 Hole to EN 4620-060-0 Key 1 Pitch diameter Figure 6 Method A Figure 7 Method B Figure 8 Method C BS EN 4620:2010EN 4620:2010 (E) 11 9.3 Example of assembly drawing See Figure 9. Key 1 Insert EN 4622-060-0 installed to EN 4619 Figure 9 Lubricant or other product to apply on external thr
44、ead of the insert shall be specified in the above key when applicable. Inserts installed in aluminium or magnesium alloy components, for example, should be lightly smeared externally with a suitable compound to prevent galvanic corrosion. BS EN4620:2010BSI GroupHeadquarters 389Chiswick High Road,Lon
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