1、ASD STANDARD NORME ASD ASD NORM prEN 4620 Edition P 1 June 2008 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.030.20 Descriptors: Aircraft indu
2、stry ENGLISH VERSION Aerospace series Inserts, MJ threads, self-locking, with self-broaching keys Design standard Srie arospatiale Douilles filetes, filetage MJ, freinage interne, clavettes auto-brochantes Norme de conception Luft- und Raumfahrt Gewindeeinstze, MJ-Gewinden, selbstsichernd, mit selbs
3、trumenden Stiften Konstruktionsnorm This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically app
4、roved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examina
5、tion and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national le
6、vel by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 30 June 2008 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2008 by ASD-STAN prE
7、N 4620:20082 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Design.3 4 Use 4 5 Required characteristics.6 6 Installation8 7 Provisions for component salvage8 8 Designation 8 9 Indication on drawings8 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs M
8、echanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 4620:2008 3 1 Scope This standard specifies the applications and installation hole dimensions for EN
9、 standard, self-locking, self-broaching key, MJ thread inserts and provisions for component salvage, for aerospace applications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For
10、 undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5855-1, Aerospace MJ threads Part 1: General requirements. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. EN 4619, Aerospace series Inserts, MJ threads, self-lock
11、ing, with self-broaching keys Installation and removal procedure. 1)EN 4621, Aerospace series Inserts, MJ threads, self-locking, self-broaching keys Technical specification. 1)3 Design Typical examples of installed inserts are shown in Figures 1 and 2. 3.1 The threaded self-locking inserts may be us
12、ed 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 minimum flange thicknesses, protrusion of the inserts will occur (see Figure 5, footnote a). Designers must therefore ensure that the
13、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 minimum selected bolt length shall ensure full thread engagement with the insert (see Figures 1 and 2). 3.4 These screw thread inser
14、ts 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 dimensions of the tools shall be taken into account as specified in EN 4619. 1) Published as ASD Prestandard at the date of publication o
15、f this standard. prEN 4620:20084 C11Key 1 1,5 pitches minimum Key 1 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 internally and externally, with 2 or more self-broaching keys. These i
16、nserts 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-locking zone of these inserts is positioned at the opposite side from the
17、 key side. Key 1 Keys to be broached into the thread of the parent component 2 Formed out-of-round to achieve self-locking feature Figure 3 prEN 4620:20085 4.2 Performance The inserts according to EN 4621 have a minimum performance of 25 re-uses at ambient temperature and 5 re-uses after baking at t
18、he 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 accordance with the technical specification of the inserts. Tab
19、le 1 Self-locking torque Nm Bolt thread diameter min. max. MJ50,8 0,25 2 MJ61 0,35 3,2 MJ71 0,5 4,6 MJ81 0,65 6 MJ101,25 1,2 9,5 4.3 Installation restrictions In applications where it is necessary to pass items through the installed insert, care shall be taken to ensure that such items do not foul t
20、he 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 thread diameter Diameter X max. MJ50,8 3,2 MJ61 3,7 MJ71 4,5 MJ81 5,3 MJ101,25 6,7 prEN 4620:
21、20086 5 Required characteristics 5.1 Installation hole See Figure 5 and Tables 3 to 6. Dimensions in millimetres KaX90 5120 512GLbE 0,08 Y AX 0,01 KYKey 1 Pitch diameter 2 Boss diameter aK allows total installation of the threaded part of the insert with 0,75 mm under-flush max. The locking feature
22、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 A K L Diameter code Bolt thread diameter a, bInstallation hole diameter a+ 0,200 min. min. 050-0 MJ50,8 MJ91-4H5H 10 7,5 14 06
23、0-0 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. prEN 4620:2008 7 Table 4 Codified dimensions of holes for first repair size inserts Dimensions in millimetres A K L D
24、iameter code Bolt thread diameter a,b Thread hole thread diameter a+ 0,200 min. min. 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 20 100-1 MJ101,25 MJ151-4H5H 16 14,5 23 aAccording to ISO 5855-1. bAccording to ISO 585
25、5-2 except MJS131 (see EN 4619). Table 5 Codified dimensions of holes for second repair size inserts Dimensions in millimetres A K L Diameter code Bolt thread diameter a,b Thread hole thread diameter a+ 0,200 min. min. 050-2 MJ50,8 MJ111-4H5H 12 7,5 14 060-2 MJ61 MJ121-4H5H 13 9 16,5 070-2 MJ71 MJS1
26、31-4H5H 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 in millimetres Without provision for repair With provision for one repair With provi
27、sion 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 23,8 MJ101,25 6,4 23,8 6,8 25,5 7,2 27,2 aE min. allows a minimum thickness equal to ab
28、out 1,5 mm. bG min. allows a minimum diameter equal to about 1,7 time the nominal installation thread diameter. prEN 4620:20088 6 Installation According to EN 4619. Inserts shall be installed between 0,25 mm and 0,75 mm below the surface of the component. 7 Provisions for component salvage When inse
29、rts are selected for a design, consideration shall be given to the feasibility of component salvage where the original hole could be damaged during manufacture, or where the hole is machined out of position. Before provision is made for component salvage, consideration shall be given to component co
30、st/mass requirements, e.g. for an inexpensive component salvage may not be an economic proposition, whereas an expensive component may necessitate salvage. Where provision for salvage is made, the component will be heavier because of the increase in wall thickness around the tapped holes. In the eve
31、nt 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 Identity block EN4620-050-0 Number of this standard Diameter code (see Tables 3 to 5) NOTE The last digit corresponds to
32、: 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 different manners given hereafter: A use of standard codification of holes given in chapter “Designation“; B use of
33、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. NOTE Above method A is recommended. In case of boss, it shall be dimensioned on the drawing. CAUTION It is important t
34、o 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 above shall be used. With method A, the drilling maximal depth is not limited; it cannot assume minimum thickness of material. prEN 4620:2008 9 9.2 Examp
35、les of definition drawing See Figures 6 to 8 for design with boss. 23 117 125 117 118 0,523 117 1 12 0,1120 5 0,08X 0,17YMJ10 x1-4H5H8 min.90 518 1Y XKey 1 Hole to EN 4620-060-0 Key 1 Hole to EN 4620-060-0 Key 1 Pitch diameter Figure 6 Method A Figure 7 Method B Figure 8 Method C 9.3 Example of asse
36、mbly drawing See Figure 9. 1Key 1 Insert EN 4622-060-0 installed to EN 4619 Figure 9 Lubricant or other product to apply on external thread 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.
