1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication _ prEN 4443 Edition P 1 October 2000 Comments should be sent within six months after the date of publication to C8 Chairman PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 6-1200 BRUXELLES -
2、Td. (+32) 2 775 8110 - Fax. (+32) 2 775 811 1 ICs: 49.030.30 Descriptors: ENGLISH VERSION Aerospace series Nuts, elliptical clinch, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), Mos2 coated Classification: 900 MPa (at ambient temperature) I425 OC Srie arospatiale Luft- und Raum
3、fahrt Einnietmutter, blind, elliptischer Kopf, selbstsichernd, filetage MJ, MJ Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), revtus Mos2 Mos2 beschichtet Klasse: 900 MPa (bel Raumtemperatur) I425 “C kcrous tte elliptique, freinage interne, en acier rsistant chaud FE-PA2601 (A286), Classificati
4、on : 900 MPa ( temprature ambiante) I425 “C This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA- Members. It has been technically approved by the experts of t
5、he concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Presfandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. Affer exa
6、mination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Oficial Services of the Member countries it will be submitted as a draf European Standard to CEN (European Committee for Standardization) for formal vote. 2000-10-31 AECMA Gulledelle 94 6-1200 BRUXELLES Mr
7、 Feltham I I aecma 200 STD-AECMA PREN qV43-ENGL 2000 = LOL23LL 0018892 793 = Page 3 prEN 4443: 2000 I Scope This standard specifies the characteristics of self-locking elliptical clinch nuts with MJ threads in FE-PA2601 , Mos2 coated, for aerospace applications. Classification: 900 MPa 1) I 425 “C 2
8、) 2 Normative references IS0 5855-2 Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts EN 2399 EN 2424 EN 2491 EN 3639 EN 4444 3 3.1 Heat resisting steel FE-PA92-HT - Rm 2 900 MPa - Bars for forged bolts - D s 25 mm - Aerospace series 3) Aerospace series - Marking of aerospace prod
9、ucts Aerospace series - Molybdenum disulphide dry lubricants - Coating methods Aerospace series - Heat resisting alloy FE-PA2601 - Softened and cold worked - Wire for forged fasteners - D s 15 mm - 900 MPa S R, 5 1 100 MPa 4) Aerospace series - Nuts, elliptical clinch, self-locking, in heat resistin
10、g steel FE-PA2601 (A286), Mos2 coated - Classification: 900 MPa (at ambient temperature) / 425 “C - Technical specification 4) Required characteristics Configuration - Dimensions - Tolerances - Masses See figure 1 and tables 1 and 2. Dimensions and tolerances are in millimetres. They apply before Mo
11、s2 coating. 3.2 Materials EN 2399 or EN 3639 3.3 Surface treatment EN 2491 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum test temperature of the parts
12、3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Prestandard at the date of publication of this standard STD-AECMA PREN Vqi13-ENGL 2000 lo12313 0038893 b2T Page 4 prEN 4443: 2000 Values apply before Mos2 coating. Thread surface will be as achieved by n
13、ormal methods of manufacture. q Remove sharp edges 0,l to 0,4. c- F I D AI k 3 R 0,15 max. YL , x (1O:ll Key I 2 Thread 3 Marking Form out-of-round in this area to achieve the self-locking requirement (tooling marks permissible). Tapping marks are accepted in the El diameter. 0,Ol underhead swelling
14、 is accepted over a length less than % of diameter D. Tolerance I :$ on diameter D is applicable only on the nominal grip length. Details of form not stated are left to the manufacturers discretion. Figure 1 Table 1 Threada I B I +$I5 I Code I Designation min. 060 MJ6x1-4H5H 11,45 11,15 070 MJ7x1-4H
15、5H 12,85 12,55 080 MJ8xl-4H5H 14.25 13,95 C D I Ei I H J t 0,15 - 0,02 O I min. 1 -0,07 I -:,I I Ref. I Ref. 7,80 9,70 10,90 12,lO 7,55 9,45 10,65 11,85 9,oo 7,25 2,oo 10.00 1.10 In accordance with IS0 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. Page 5 prEN 44
16、43: 2000 O s O O ln O STD-AECMA PREN qqll3-ENGL 2000 I 3032333 0038875 4T2 = Description block Page 6 prEN 4443: 2000 Identity block 4 Designation EXAMPLE: Thread code (see table 1) Grip length code (see table 2) NOTE If necessary, the code 19005 shall be placed between the description block and the identiiy block. 5 Marking EN 2424, style A, as indicated on figure 1 6 EN 4444 Technical specification P
