1、ASD STANDARD NORME ASD ASD NORM prEN 4673-002 Edition P 1 December 2009 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Descriptors: ENGLISH VERSION Aer
2、ospace series Inserts, UNJ threads, self-locking, with self-broaching keys Part 002: Design standard Srie arospatiale Douilles filetes, filetage UNJ, freinage interne, clavettes autobrochantes Partie 002 : Norme de conception Luft- und Raumfahrt Gewindeeinstze, UNJ-Gewinden, selbstsichernd, mit selb
3、strumenden Stiften Teil 002: 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 tech
4、nically approved 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. Af
5、ter examination 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
6、national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 15 December 2009 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2009
7、by ASD-STAN prEN 4673-002:2009 (E) 2 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 9 9 Indication on drawings9 Foreword This standard was reviewed by the Domain Technical C
8、oordinator of ASD-STANs Mechanical 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 4673-002:2009 (E) 3 1 Scope This standard specifies the applications and in
9、stallation hole dimensions for EN standard, self-locking, self-broaching key, UNJ threads 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,
10、only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 4673-001, Aerospace series Inserts, UNJ threads, self-locking, with self-broaching keys Part 001: Installation and removal procedure. 1)EN 4673-003, Aerospace
11、series Inserts, UNJ threads, self-locking, self-broaching keys Part 003: Technical specification. 1)ISO 3161, Aerospace UNJ threads General requirements and limit dimensions. 3 Design Typical examples of installed inserts are shown in Figures 1 and 2. 3.1 The threaded self-locking inserts may be use
12、d 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 i
13、nserts do not protrude into an abutment face or foul any other adjacent features. 3.2 The installed insert is compatible with UNJ threaded bolts to ISO 3161. 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 inserts
14、 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 4673-001. 1) Published as ASD-STAN Prestandard at the date of public
15、ation of this standard. prEN 4673-002:2009 (E) 4 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-broachi
16、ng 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-locking zone of these inserts is positioned at the opposi
17、te side from the 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 4673-002:2009 (E) 5 4.2 Performance The inserts according to EN 4673-003 have a minimum performance of 25 re-uses at ambient temperature an
18、d 5 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 accordance with the technical spec
19、ification of the inserts. Table 1 Self-locking torque Nm Bolt thread diameter min. max. .190 0-32UNJF 0,23 3,40 .250 0-28UNJF 0,40 6,78 .312 5-24UNJF 0,73 13,56 .375 0-24UNJF 1,07 18,08 .437 5-20UNJF 1,58 22,60 .500 0-20UNJF 2,03 33,90 4.3 Installation restrictions In applications where it is necess
20、ary to pass items 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 prEN 4673-002:2009 (E) 6
21、Table 2 Dimensions in millimetres Bolt thread diameter X max. .190 0-32UNJF 3,0 .250 0-28UNJF 4,1 .312 5-24UNJF 5,4 .375 0-24UNJF 6,7 .437 5-20UNJF 7,5 .500 0-20UNJF 8,55 Required characteristics 5.1 Installation hole See Figure 5 and Tables 3 to 7. Dimensions in millimetres KaX90 5120 512GLbE 0,08
22、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 of the insert may protrude. bL min. K 5 pitches. Allows automatic tapping. Figure 5 prEN 4673-002:2009 (E) 7 Table 3 Codified dimensions
23、of holes for normal size inserts Dimensions in millimetres A K L Diameter code Bolt thread diameter a Installation hole diameter a+ 0,2 0 min. min. 3-0 .190 0-32UNJF .312 5-18UNJC-3B 8,9 6,75 13,8 4-0 .250 0-28UNJF .375 0-16UNJFC-3B 10,5 8,75 16,6 5-0 .312 5-24UNJF .437 5-16UNJ-3B 12,1 10,25 18,1 6-
24、0 .375 0-24UNJF .500 0-16UNJ-3B 13,7 12,25 20,1 7-0 .437 5-20UNJF .562 5-16UNJ-3B 15,2 14,25 22,1 8-0 .500 0-20UNJF .625 0-16UNJ-3B 16,8 16,25 24,1 aAccording to ISO 3161. Table 4 Codified dimensions of holes for first repair size inserts Dimensions in millimetres A K L Diameter code Bolt thread dia
25、meter a Installation hole diameter a+ 0,2 0 min. min. 3-1 .190 0-32UNJF .375 0-16UNJC-3B 10,5 8,75 16,6 4-1 .250 0-28UNJF .437 5-16UNJ-3B 12,1 10,25 18,1 5-1 .312 5-24UNJF .500 0-16UNJ-3B 13,7 12,25 20,1 6-1 .375 0-24UNJF .562 5-16UNJ-3B 15,2 14,25 22,1 7-1 .437 5-20UNJF .625 0-16UNJ-3B 16,8 16,25 2
26、4,1 8-1 .500 0-20UNJF .687 5-16UNJ-3B 18,4 17,25 25,1 aAccording to ISO 3161. Table 5 Codified dimensions of holes for second repair size inserts Dimensions in millimetres A K L Diameter code Bolt thread diameter a Installation hole diameter a+ 0,2 0 min. min. 3-2 .190 0-32UNJF .437 5-16UNJ-3B 12,1
27、10,25 18,1 4-2 .250 0-28UNJF .500 0-16UNJ-3B 13,7 12,25 20,1 5-2 .312 5-24UNJF .562 5-16UNJ-3B 15,2 14,25 22,1 6-2 .375 0-24UNJF .625 0-16UNJ-3B 16,8 16,25 24,1 7-2 .437 5-20UNJF .687 5-16UNJ-3B 18,4 17,25 25,1 8-2 .500 0-20UNJF .750 0-16UNJF-3B 20,0 18,25 26,1 aAccording to ISO 3161. prEN 4673-002:
28、2009 (E) 8 Table 6 Minimal dimensions of holes Dimensions in millimetres Without provision With provision for repair for one repair for two repairs Bolt thread diameter E amin. G bmin. E amin. G bmin. E amin. G bmin. .190 0-32UNJF 5,1 14,5 6,0 17,5 6,9 21 .250 0-28UNJF 6,0 17,5 6,9 21 7,8 24 .312 5-
29、24UNJF 6,9 21 7,8 24 8,7 27 .375 0-24UNJF 7,8 24 8,7 27 9,6 30 .437 5-20UNJF 8,7 27 9,6 30 10,5 33 .500 0-20UNJF 9,6 30 10,5 33 11,4 36 aE min. allows a minimum thickness equal to about 1,5 mm. bG min. allows a minimum diameter equal to about 1,7 time the nominal installation thread diameter. 6 Inst
30、allation According to EN 4673-001. Inserts shall be installed between 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
31、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 cost/mass requirements, e.g. for an inexpensive component salvage may not be an economic proposition, whereas an expensive component
32、 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 event of component salvage action, hole preparation, repair size insert selection and installation shall be in accordance with EN 467
33、3-001. prEN 4673-002:2009 (E) 9 8 Designation EXAMPLE Description block INSERT Identity block EN4673-002-5-0 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 Me
34、thods of drawing Installation hole can be indicated on design drawing in 3 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
35、 give all dimensions and tolerances of the hole and boss on the drawing. NOTE 1 Above method A is recommended. NOTE 2 In case of boss, it shall be dimensioned on the drawing. CAUTION It is important to check that the bolt does not interfere with the bottom of the hole notably when method A is used.
36、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 4673-002:2009 (E) 10 9.2 Examples of definition drawing See Figure 6 to 8 for example of design with boss. 23 117 125 117
37、 118 0,523 117 1x 12 0,1120 5 0,08x 0,17YMJ10 x1-4H5H8 min.90 5C18 1YKey 1 Hole to EN 4673-002-6-0 Key 1 Hole to EN 4673-002-6-0 Key 1 Pitch diameter Figure 6 Method A Figure 7 Method B Figure 8 Method C 9.3 Example of assembly drawing See Figure 9. 1Key 1 Insert EN4673-004-6-0 installed to EN4673-0
38、01 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.
