1、- AECMA PREN2752 6 D 1012311 0007378 2 -1 - -, - - A.E.C.M.A. STANDARD prEN2752 NORME A.E.C.M.A. Edition 1 A.E.C.M.A. NORM July 1986 ENGLISH VERSION Aerospace series Nuts, anchor, self lock ng fixed, two lug, reduced series, with counterbore Classification : 11 O0 MPa/235 OC Srie arospatiale crous r
2、iver freinage interne fixes, double patte, srie.rduite avec chambrage Classification : 11 O0 MPa/235 OC Luft- und Raumfahrt Annietmuttern, selbstsichernd, beiderseitiger verkrzter Fiansch mit zylindrischer Auscenkung Klasse : I100 MPa/235 OC This industrial standard for the aerospace sector has been
3、 drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on yellow paper in three equivalent versions (English, French, German). It will be submitted to CEN (European Committee for Standardization as a draft European Standard. Appro
4、ved by The equivalent versions in French and German languages COMITE DE NORMALISATION can be supplied by B.N.A.E., 8, rue Moreau-Vauthier of A.E.C.M.A. 1986-06-16 92100 BOULOGNE-BILLANCOURT - FRANCE. -T AECMA PREN2752 6 10123LL 0007399 4 1 Scope prEN2752 Page 3 This standard specifies the characteri
5、stics of self locking, two lug, fixed, reduced series anchor nuts, with counterbore. 2 Field of application These nuts are intended for use in aircraft assemblies subjected principal- ly to shear loading. They are intended to be used with bolts of 1100 MPa tensile strength cl ass if i cat ion. The c
6、ounterbore can accommodate a bolt plain shank in excess of assembly thickness, as well as the incomplete threads, The cadmium plating restricts the application to temperatures not exceeding 235 OC. 3 References IS0 5855/1, Aerospace Construction - MJ Threads - Part 1 : Basic IS0 5855/2, Aerospace Co
7、nstruction - MJ Threads - Part 2 : Dimensions prof i 1 e for bolts and nuts IS0 5858, Aerospace - Self locking nuts, maximum operating tempera- ture 425 “C - Procurement specification 1) IS0 8788, Aerospace - Fasteners - Tolerances of form and position for nuts 1) EN2000, Aerospace series - Qual i t
8、y Assurance requi remenls for the manufacture and procurement of EN aerospace standard products Cadmium plating of steels with maximum specified tensile strength equal or less than copper alloys - Aerospace series EN2424, Identification marking of standard fasteners - Aerospace series EN2491, Aerosp
9、ace series - Molybdenum disulfide solid film lubri- cants for application to removable fasteners in itanium, titanium alloy, corrosion resisting steel and cadmium plating steel i) Aerospace series - Steel FE-PL43 S - 1250 MPa Rm 1400 MPa - Sheets and strips - 0,3 mm a 2 mm - Only for prevailing torq
10、ue nuts 1). - EN2133, 1450 MPa, and copper and - EN2543, - - 4 Required characteristics 4.1 The configuraticn shall correspond with the figure, which does not dictate any particular method of manufacture. Details of form not defined are at manufacturers option. Dimensions and tolerances 2) specified
11、 in the figure and the table shall apply after cadmium plating, but before application of Mos2 lubrication. 4.2 Haterials Steel EN2543 Configuration - Dimensions - Tolerances ;- Previous page is blank 1) In preparation. _ 2) In conformity, with IS0 8788 for tolerances of form and position. AECIA PRE
12、N2752 8b 1OL23LL 0007400 7 = prEN2752 Page 4 Break all corners 0, to 0,4 mm +0.2 Bole 4 2.5 o Section Y-Y r“; m Deformation in this area ;,Pt;tdeel.seIf40cking IA L J- o,15 A Applicable over a diameter equal to K. Figure - Configuration Table - Dimensions and masses Dimensions in millimetres Mass Co
13、de Designation min. min. max. max. max. max. max. max. 040 MJ 4 X 0.7 - 4H6H 6 12 4,4 2.2 6.2 8 17,2 5,8 1,I 2,5 12 050 MJ 5 X 0.8 - 4H6H 7 14 53 2.4 7,3 9 19.2 6,9 1,l 2.5 1.5 060 MJ 6 X 1 - 4H5H 8 16 6.5 2,7 8,7 10 22.2 8,l 1.3 3 212 E F G H J6) K 7, kg/1000 pieces Thread 5) 3) 4) 5) 6) 7) Values
14、apply priorto cadmium plating and Mos2 lubrication. They do not applyto the thread, sheared edges and punched edges; the surface roughness will be as achieved by normal methods of manufacture. Tooling marks are permitted in this area. In conformity with IS0 5855 parts 1 and 2. In the self locking zo
15、ne, the tolerances apply before deformation. Is to sharp corners (chamfered) or point of tangency (radiused). Is applicable at the rivet hole location. - 1 AECMA PREN2752 Bb = 1012311 000740L 9 mi prEN2752 Page 5 4.3 Surface treatment - Cadmium plating EN2133, 5 pm minimum on the threads and all are
16、as which can be contacted by a 20 rnm diameter ball. On all other areas, a continuous deposit shall be present but no minimum value is specified. - Lubrication by Mos2 EN2491, mandatory on threads, optional on other surfaces. 5 Designation Each nut shall only be designated as in the following exampl
17、e : Description B1 ock NUT, ANCHOR Identity Block Number of EN Standard 1 1 060 : Thread code (see table) 1 Note : If necessary the originator code S9005 may be introduced between the description block and the identity block, 6 Marking Each nut shall be marked in any of the positions shown on the figure ir; accordance with EN2424, Style F. 7 Technical specification Conforming to IS0 5858 except for certification and quality assurance requirements - see EN2000.
