1、r - I AECMA PREN2909 86 W LOL2311 0004397 - 7 A. E. C. M. A. STAN DARD - prEN2909 issue P 1 NORME A.E.C.M.A. A.E.C.M.A. NORM May 1986 EDITE PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TEL. 45-63-82-85 Edition approved for publication 15
2、May 1986 UDC : Key words : Comments should be sent within six months C8 Chairman Mr WILLIAMS after the date of publication decision A.E.C.M.A. 88, Bd. Malesherbes 75008 PARIS - FRANCE ENGLISH VERSION Aerospace series Nuts, self locking, bi hexagonal, deep counterbored, in heat resisting steel FE-PA9
3、2HT (A286) silver plated Classification : 1 1 O0 MPa/650 OC Srie arospatiale crou bihexagonal, auto-freinant, chambr, en acier rsistant chaud FE-PA92HT (A286) argent Classification : 11 O0 MPa/650 OC Luft- und Raumfahrt Zwlfkantmuttern, selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfeste
4、m Stahl FE-PA92HT (A286) versilbert Klasse : 1 1 O0 MPa/650 OC This standard is initially published on green paper for the needs of AECMA-Members (Association Europenne des Constructeurs de Matriel Arospatial). It has been technically approved by the experts of the concerned AECMA Commission followi
5、ng comment by the manufacturers of the Member countries. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be published in its final version on yellow paper as an AECMA Standard. 0 aecma 1986 I AE
6、CMA PREN2909 86 1012311 - 0004398 9 prEN2909 Page 3 Issue PI 1 Scope and field of application This standard specifies the dimensions of seIf-locking, silver-coated bihexagonal nuts with MJ-thread and deep counterbore in heat resisting steel FE-PA92-HT according to EN2399 for aerospace applications.
7、Maximum test temperature of the material 650 OC. 2 References IS04095 Fasteners for aerospace construction - Bi-hexagonal wrenching configuration IS05855/1 Aerospace construction - MJ threads - Part 1: Basic profile IS05855/2 Aerospace construction - MJ threads - Part 2: Dimensions for bolts and nut
8、s IS08788 Aerospace Fasteners - Tolerances of form and position for nuts (1) EN2399 Heat resisting steel FE-PA92-HT; Rm 2900 MPa, bars for forged bolts DS 25 mm - Aerospace series EN2424 Identification marking of standard fasteners - Aerospace series EN2786 Aerospace series - Electrolytic deposition
9、 of silver on metals (i) EN3004 Aerospace series - Nuts, self-locking, material FE-PA92-HT, classification 1100 MPa/650 OC - Technical specification (1) 3- Required characteristics 3.1 Configuration - Dimensions - Tolerances Configuration shall be in accordance with the figure; dimensions, tolerance
10、s (2) and masses shall conform with the figure and the table. Details of form, not stated are at the manufacturers option. Dimensions are after coating. 3.2 Material Heat resisting sfeel FE-PA92-HT according to EN2399 3.3 Surface treatment Silver coat to EN2786, coating thickness 5 to 15 /um. On nut
11、s MJ6 and larger, the coating thickness shall be not less than 5 /um, measured at the pitch diameter. Nuts MJ5 and smaller shall show complete coating coverage on the threads. . Previous page I is blank I (1) in preparation (2) In conformity with IS08788 for tolerances of form and position I - AECMA
12、 PREN2707 Bh LOL23L1 0004377 O Thread E min. 43 9,8 11,3 12, 158 KLM (3) min. min. 5,7 2 5,95 2,3 6,2 2,6 6,45 2,8 6,7 3,l -_ -_ prEN2909 Page 4 Issue PI ing. Ihods These values are lo be applied before silver-coat Threads surface uill be as achieved by normal me of manufacture Harking on the flange
13、 Remove sharp edges 0,l to 0,4 RBI Figure - Configuration . Table - Dimensions and masses illimetres Mass kg/1000 part max. 2,87 C 475 iensions in r - F (1) - 7 - J max. 9,l - H max. 11,5 “e I Designation I min. 5,2 MJ 5xO18-4H6H max. 598 - 00 I MJ 6x1,0-4H51-i I 6,3 8 12,9 10,6 3,9B 070 I MJ 7xl10-
14、4H5H I 7,3 9 14,l 12,l 4,95 080 I MJ 8x1,0-4H5H I 83 9,1 11,l _ 10 13,6 163 - 15,7 185 100 I MJ 10x1,25-4GH I 103 12 (1) Bihexagonal configuration in conformity with 1504095 over length “MI (2) Thread in conforinity with IS05055 part 1 and part 2. In self-locking zone the tolerances apply before for
15、ming out of round. (3) Wrench pad engagement AECMA PREN2907 86 = LOL23L 0004400 3 m 1 Description block prEN2909 Page 5 Issue PI Identity block Number of EN Standard Thread code Note: If necessary, the design code S9005 may be introduced between the description block and the identity block. 5 Marking Each bihexagonal nut shall be marked in accordance to EN2424, class A. 6 Technical specification The bihexagonal nuts shall conform to the requirements of EN3004.
