1、AECMA PREN2908 86 1012311 0004393 T r Edition approved for publication 15 May 1986 A. E. C. M. A. STAN DAR D NOR ME A. E.C. M.A, A.E.C.M.A. NORM Comments should be sent within six months C8 Chairman A.E.C.M.A. Mr WILLIAMS after the date of publication decision 88, Bd. Malesherbes 75008 PARIS - FRANC
2、E prEN2908 Issue P 1 May 1986 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : - ENGLISH VERSION Aerospace series Nuts, self locking, bi hexagonal, deep counterbored, in heat resisting steel FE-PA92HT (
3、A286) unplated Classification : I 1 O0 MPa/650 OC Srie arospatiale Luft- und Raumfahrt crou bihexagonal, auto-freinant, chambr, en acier rsistant chaud FE-PA92HT (A286) non revtu Classification : 1 I O0 MPa/650 OC Zwlfkantmuttern, sel bstsichernd, mit zylindrischer Aussenkung, aus hochwarmfestem Sta
4、hl FE-PA92HT (A286) blank Klasse : I1 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 following comment
5、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. prEN2908 Page 3 Issue PI 1 S
6、cope and field of application This standard specifies the dimensions of self-locking, unplated bihexagonal nuts with MJ- thread and deep counterbore.in heat resisting steeI FE-PA92-HT according to EN2399 for aerospace applications. Maximum test temperature of the material 650 OC. 2 References IS0409
7、5 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 nuts IS08788 Aerospace Fasteners - Tolerances of form and position for
8、nuts (1) EN2399 Heat resisting steel FE-PA92-HT; Rm a900 MPa, bars for forged bolts DS 25 mm - Aerospace series EN2424 Identification marking of standard fasteners - Aerospace series EN3004 Aerospace series - Nuts, self-locking, material FE-PA92-HT, classif ication 1100 MPa/650 OC - Technical specif
9、ication (i) ._ 3 Required characteristics 3.1 Configuration - Dimensions - Tolerances Configuration shall be in accordance with the figure; dimensions, tolerances (2) and masses shall conform with the figure and the table. Details of form, not stated are at the manufacturers option. 3.2 Material Hea
10、t resisting steel FE-PA92-HT according to EN2399 3.3 Surface treatment None Previous page 1 is blank (i) In preparation (2) In conformity with IS08788 for tolerances of form and position AECMA PREN2708 _ b 1012311 0004375 3 J K L M N T y z max. min. min. min. max. +O,Z 9,l 8,3 5,7 2 9,l 4,5 Oll 0,2
11、10,6 9,8 5,95 2,3 10 4,75 0,l 0,2 12,l 11,3 6,2 2,6 10,7 5,O 0,l 0,2 13,6 12,8 6,45 2,8 12,2 5,25 0,l 0,2 16,8 15,8 6,7 3,l 14,3 5,5 0,13 0,3 (3) - prEN2908 Page 4 Issue PI Mass kg/1000 part max. 287 3,98 4,95 6,O 884 Threads surface uiII be as achieved by y (v/ ) narina1 methods of manufacture Hark
12、ing an the flnnge Thread c 050 060 070 080 100 MJ 50,8-4H6H MJ 6xl90-4H5H MJ 7xlI0-4H5H MJ 8xlI0-4H5H MJ 10125-4H51-1 H Remove sharp edges O,! lo 0,4 mm Figure - Configuration Table - Dimensions and masses 6 places (i) ijihexaqonal configuration in conformity with IS04095 over length “Mt (2) Thread
13、in conformity with IC05855 part 1 and part 2. In self-locking zone the tolerances apply before forming out of round. (3) Wrench pad engagement prEN2908 Page 5 Issue PI NUT 4 Designation EN2908-050 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.
