1、a O O O Edition approved for publication Comments should be sent within six months after the date of aublication decision A.E.C. M.A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM C8 Chairman prEN 3542 issue P 1 October 1990 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, bou
2、levard Malesherbes, 75008 PARIS -TL. 45-63-82-85 ENGLISH VERSION Aerospace series Insert, screw thread, helical coil, self-locking, in heat resisting alloy, nickel base alloy unplated (INCO X750 - EN 301 8*), “4 Srie a,. ospatiale Filets rapports, freinage interne, en alliage rsistant chaud, base de
3、 nickel Luft- und Raum., Draht-Gewindeeinstze, selbstsichernd, Warme bestandige, Nickel basis Legierung (INCO X750 - EN 301 8*), (NCO X750 - EN 301 8*)r sans revtement blank This Aerospace Seriess pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeu
4、rs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shalinot be chang
5、ed to an extent that interchangeability is affected, physicalry or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Officiaiservices of the Member countries it will be submitted as a draft
6、 European Standard to CEN (European Committee for Standardization) for final vore. * will be replaced by the complete designation when available 1990-1 0-31 A.E.C.M.A. 88, Bd. Malesherbes 75008 PARIS - FRANCE Mr. WILLIAMS aecrna 1990 - prEN 3542 Page 3 1 Scope and field of application This standard
7、specifies the characteristics of self-locking thread inserts, in Inconel X750, unplated, for aeronautical applicatfons. Maximum test temperature : 550 OC. 2 References IS0 5855-1, Aerospace - MJ Threads - Part 1 : General requirements IS0 5855-2, Aerospace - MJ Threads - Part 2 : Limit dimensions fo
8、r bolts and nuts EN 2424, Aerospace series - Identification marking of standard fasteners 1) EN 2943, Aerospace series - Wire thread inserts, prevailing torque (self-locking) - Technical specification 2) EN 2945, Aerospace series - Assembly with self-locking thread inserts 2) EN 3018, Aerospace seri
9、es - Heat resisting nickel-based alloys (INCO X750) 3) EN 3044, Aerospace series - Design dimensions 2). Installation of self-locking thread inserts - 3 Materials, surface treatments, material identification 3.1 Material Nickel-based alloy EN 3018. 3.2 Surface treatment None. 3.3 Material identifica
10、tion Colour : yellow. 4 Required characteristics 4.1 Configuration, dimensions, tolerances The configuration shall be in accordance with figure 1 on p ge 5 dimensions and tolerances shall be in accordance with the values shown on figure 1 and tables 1 and 2. 1) Published as AECMA standard at the dat
11、e of publication of the present standard. 2) Published as AECMA pre-standard at the date of publication of the present standard. 3) In preparation at the date of publication of the present standard. Previous page is blank I 1 k - AECMA PREN3542 90 m 1012311 0006703 6 E prEN 3542 Page 4. 4.2 Surface
12、roughness See figure 1. 4.3 Thread In accordance with tables 1 and 2. 5 Installation of self-locking thread inserts See EN 3044. 6 Assembly with self-locking thread inserts See EN 2945. AECMA PREN35Li2 90 M 10123211 0006704 B prEN 3542 Page measured at 3$ king characteristics 1) O0 ta dimensions for
13、 use of design offtees detail z 4) section K 7) 8) 5 459 see detail W detail w 7) 8) I Figure 1) Locking shall be in the zone defined in 6). It shall take place on at least 2 locking coils separated by an uncompressed coil, except in the case of inserts af diameter 4.5 and 6 and basic length L.25D w
14、here the uncompressed- coil may -be omitted. The remaining form,characteristicc are the choice of the manufacturer and shall be fixed when the thread insert 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 u
15、pper face of the first coil behind the blend point of the tang radius, 5) the nominal length L is a reference, It is equal to the basic length of the thread insert. 6) Y max. - X min. = zone in which locking system may be achieved, 7) Dimensions after wrapping, corresponding to an insert fitted in a
16、 threaded hole as per EN 3044. 8) Section K is perpendicular to the insert wrapping angle. prEN 3542 Page 6 Table 1 - Dimensions Dimensions in millimetres 3i ameter Thread A B C E F H code Dia. x pitch 1) (Associated bolt) min. min. max. min. max. min. max. min. max. 040 MJ4x0,7 0,163 5,05 5,6 0,683
17、 0,758 0,51 0,612 0,35 0,4445 0,455 - 050 MJSx0,E 0,209 6,25 0,8 0,775 0,866 0,598 0,7 0,4 0,5085 0,52 060 MJ6xl 7,4 7.95 070 MJ7xl 0,267 8,65 9,2 0,975 7,083 0,748 0,875 0,s 0,637 .O365 080 MJ8xl 9,7 10,25 1 O0 MJ1 Oxl,25 0,415 12,l 12,65 1,251 1,353 0,967 1,094 0,625 0,799 0,812 Di ameter J P R S
18、u V AA code min. max, min. max. min. . min. min. max. max. min. max. 040 4 89 5,6 2,5 3,55 0,126 0,219 1,02 1,67 0,45 0,31 0,34 050 6,1 6,8 3,15 4,5f 0,144 0,25 l,4l 2,09 0,34 0,37 060 7,25 7,95 3,7 4,85 1,65 2,55 070 8,4 982 4,3 5,5 0,18 0,312 . 2,09 3,l 0,45 0,s 080 9,2 10 4,75 6,s 2,27 3,88 0,75
19、1 O0 11,5 12,3 5,5 0,226 0,391 2,86 4,77 0,55 0,6 036 I 8 I I Table 2 - Length, number of coils and weight Dimensions in millimetres Diameter Thread L L1 t0,25 - X min. 2) Y max. 2) Q Ref. Mass (8,25 kg/dm3) code Dia. X pitchtl) kg/1000 pieces 2 (Associated bolt) 1,25D 1,fD 1,25D 1,5D 1,25D 1,5D 1,2
20、5D 7,5D 1,25D 1,SD 1,25D 1 ,SD 040 MJ4x0,70 5 6 4,47 5,47 1,s 1,s 3 3,7 4,9 6,l 0,19 0,23 0,42 6,3 7,s 2 3,8 4,2 5,s 6,9 0,34 050 MJ5x0,80 5,65 6,9 2 060 MJ6x1,OO 7,s 9 6,75 8,25 2,3 2,3 4,s 5,5 5,4 6,8 0,61 0,75 070 MJ7x1,OO 8,8 10,5 8 9,75 2,5 2,5 5,s 6,s 6,5 8 0,84 1 ,O3 080 PJ8x1,OO 10 12 9,25 1
21、1,25 3 3 7 7 7,5 9,4 7,12 1,38 1 O0 PJl Oxl,25 12,s 15 11,56 14,06 3,s 3,s 9 9 7,6 9,s 2,19 2,68 1) In accordance with ISO5855-1 and 5855-2. 2) X and Y dimensions are after fitment of the insert. AECMA PREN3542 i0 I IO12321 000690b I 7 Designation Example : Identity block I Description block EN3542-
22、080120 - THREAD INSERT Reference of EN standard Code of nominal diameter D (insert fitted, see table 1) Length L (in millimetres multiplied by 10, see table 2) Note : In necessary, the originator code I9005 shall be placed between the description block and identity block. 8 Marking EN 2424, styIe F.
23、 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- conform to the requirements of EN 2943. accordance with this standard must
