1、A. E. C. M. A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 2942 Issue P 1 October 1990 EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS - l$L, 45-63-82-85 ENGLISH VERSION Aerospace series Insert, smew thread, helical coil, self-lo
2、cking, iri kea-iksishg alloy, nicke9 base alloy (INCO X750 - EN 3018*), silver plated Srie arospatiale Luft- und Raumfahrt Filets rapports, b freinage interne, Draht-Gewindeeinstze, selbstsichernd, Warme bsstandige, Nickel basis Legierung en alliage rsistant chaud, base de nickel (INCO X750 - EN 301
3、8*), (INCO X750 - EN 301 8*), argents versilbert This Aerospace Series. pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is publishedon green paper for the needs of AECMA-Members. It has been technically approvedby t
4、he experts of the concerned . Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected physically or functionally, without re-identification of the standard. A
5、fter examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard t CEN (European Committee for Standardization) for final vote. . - * will be replaced by the complete des
6、ignation when available Nota - Extra copies can be supplied by6.N.A.E. - 8, rue Moreau-Vauthier - 92100 BOULOGNE-BILLANCOURT Edition approved for publication Comments should be sent within Sixmonths C8 Chairman after the date of publication decision Mr. WILLIAiVS A.E.C.M.A. 88. Bd. Malesherbes 7 199
7、0-1 0-31 , I 75008 PARIS - FRANCE I CEN PREN82942 90 W 3404589 0015034 8 W prEN 2942 This draft standard is based in international discussions in which the UK has taken an active part, further participation by the UK in this work and in the preparation of the consequent British Standard. Technical c
8、omments on this draft will issist Cross References International Standard Corresponding British Standard IS0 5855-1 IS0 5855-2 EN 2424 EN 2943 EN 2945 EN 3018 EN 3044 E BS 6293/1 E BS 6293/2 none none none none none - 2- CEN PREN*Z942 90 m 3404589 0035035 T m; prEN 2942 Page 3 1 Scope and field of a
9、pplication I This standard specifies the characteristics of self-locking , 8ilVer-plated thread inserts, in Inconel X750, for aeronautical applications. Maximum test temperature : 550 OC. . 2 References ISO 5855-1, Aerospace - MJ Threads - Part 1 : General requirements EN 2945, EN 3018, Aerospace se
10、ries - Assembly with self-locking thread ineerts 3) Aerospace series - Heat resisting, nickel-based alloys (INCO X750) 2) EN 3044, Aerospace series - Installation of self-locking thread inserts - Design dimensions 3). 3 Materials, surface treatments, material identification I 3.1 Material Nickel-bas
11、ed alloy EN 3018. 3.2 Surface treatment Silver plating EN 2786, thickness 2 um to 5 um. 3.3 Material identification None (satin-finish white colaur of the silver plating), i) Published as AECMA standard at the date of publication of the present standard. 2) In preparation at the date of publication
12、of the present Standard. 3). Published as AECMA pre-standard at the date of publicationof- tjr4 present standard. -%- CEN PREN*E!942 90 I 3404589 0035036 3 Ei prEN 2942 Page 4 4 Required characteristics 4.1 Configuration - Dimensions - Tolerances The configuration shall be in accordance with the fig
13、ure 1 on page 5 : Dimensions and tolerances shall be in accordance with the values shown on figure 1 and in tables 1 and 2, All dimensions are after silver plating. # 4.2 Surface roughness See figure 1. Values are after silver plating. 4.3 Thread In accordance with tables 1 and 2. 5 See EN 3044. Ins
14、tallation of self-locking thread inserts 6 Assembly with self-locking thread inserts See EN 2945. -A- -. . ! - prEN 2942 Page 5 . ._ ing charorteristics 1) dimensions for use of desiSn offJccc detal 4) &ion K 7) a) - see detail W I Figure i) Locking shall be in the zone defined in 6). It shall take
15、place on at least 2 locking coils separated by an uncompressed coil, except in the case of inserts of diameter 4,s and 6 and basic length 1.25 I) where the uncompressed coil may be omitted. The remaining form characteristics are the choice of the manufacturer and shall be fixed when the thread inser
16、ts are qualified. 2) The number of un-engaged coils is counted from the notch. 3) Length of fitted insert to notch. 4) The notch shall be on the upper cace of the first coil behind“the*blend point of the tang radiusr 5) The nominal length L is a reference. It is equal to the basic length of the thre
17、ad insert. 6) Y max. - X min. = zone in whhh locking system may be achieved. 7) Dimensions after wrapping, corresponding to an insert fitted in a threaded hole as per EN 3044, 8) Section K is perpendicular to the insert wrapping angle. Y I . -5- XJi/Eji 6:s I prW 2942 Page 6 060 070 080 1 O0 CEN PRE
18、N82942 90 3404589 0035038 5 H MJ6xl MJ7xl 0,267 MJ8xl b!JlOxl,25 0,475 1 Table 1 - Dimensions 7,4 8,65 9,7 12,l Dimensions in millimetres 7,95 9,2 10,25 12,65 Thread Di:teDia. x pitch 1) I A Associated bolt) min. Di ameter J P R 5 U V AA code min. rnax. min. max. min. min., min. max. max, min, max.
19、040 4 s9 5 $6 2,s 3,55 0,726 0,219 1,02 1,67 0,45 0,31 0,34 05 O 6,1 6 s8 3,15 4,55 0,144 0,25 1,41 2,09 0,34 0,37 060 7,25 7,95 3,7 4,85 1,65 2,55 070 8 r4 9,2 4,3 Sa5 0318 0,312 2,OS 3,1 0,45 0,s 080 9,2 10 4,75 6,s 2,27 3,88 0,75 100 11 #5 12,3 5,s a 0,226 0,391 2,86 4,77 0,SS 0,6 - Os6 050 I MJS
20、XO, 10,209 Diameter Thread L L1 i25 X min. 2) Y max. 2) Q Ref Mass (8,25 kg/dm3) code Dia. X pitch(1) kg/1000 pieces Associated bolt) 1,250 1,5D 1,25D 1,5D 1,251) 1,5D 1,ZD 1,50 1,21D 1 ,SO 1,250 1 ,fD 040 W4x0,70 5 6 4,47. 5,47 1,5 1,s 3 3,7 4,9 6,l 0,19 O ,23 050 K15x0,O 6,3 7,s 5,65 6,9 2 2 3,s 4
21、,2 5,s 6,9 0,34 O ,42 060 MJ6x1,OO 7,s 9 6,75 8,25 2.3 2,3 4,s 5,s 5,4 6,8 0,61 O $75 070 W7x1,OO 8,8, 10,s 6 .9,75 2,s 2,s S,S 6,5 6,s 8 0,84 1,03 O80 HJBx1,OO 10 12 9,25 11,25 3 3 7 7 7,s 9,4 1.,12 1,38 100 KllOxl,25 12,s , 15 11,56 14,06 3,s 3,s 9 9 7,6 9,s 2,19 2s68 , - 7 8 min.1 max. 6,251 6, -
22、 min O ,683 0,775 - - - 0,975 - 4,251 - max. O ,758 0,866 - - - 1,083 I - 1,353 L, 0,598 0,7 0,748 0,875 0,967 I 1,094 H O ,637 0,65 _r_ 0,799 0,872 - . 1) In accordance.with IS0 3855-1,and 5855-2. 2) X and Y dimensions are after fitment of the insert. . . : . . , . .- . . _. . _. i. . .I. 1. . . -
23、- -L- f- . . _. li- 7 . CEN PREN*Z942 90 3LI04589 0035039 7 W prEN 2942 Page 7 7 Designation Example : description block Ident i ty block EN2942-080-120 Reference of EN standard Code of nominal diameter D (insert fitted - see table i) Length L (in millimetres multiplied by 10, see table 2) Note : If
24、 necessary, the originator code I9005 shall be placed between the description block and the identity block. 8 Marking EN 2424, style F. Marking optional. At the position shown on figure 1, Permanent marking : process to be chosen by manufacturer, but must not impair the characteristics of the thread insert. 9 Technical specification The self-locking thread inserts supplied in accordance with this standard must conform to the requirements of EN 2943.
