1、AECMA PREN2753 87 JOI12311, 0004L07 5 Edition approved for publication 16 February 1987 A. E. C. M. A. STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM Comments should be sent within six months C3 Chairman after the date of publication decision 88, Bd. Malesherbes A.E.C.M.A. Mr ARENA 75008 PARIS - FRANCE
2、 prEN2753 Issue P 1 February 1987 UDC DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS - TL. 45-63-82-85 Key words : ENGLISH VERSION Aerospace series Nuts, anchor, self locking one lug, with counterbore Classification : 1 1 O0 MPa/235 OC S
3、rie arospatiale crous river freinage interne simple patte avec chambrage Classification : 1 1 O0 MPa/235 OC Luft- und Raumfahrt Annietmuttern, selbstsichernd, einseitiger Flansch mit zylindrischer Aussenkung Klasse : 11 O0 MPa/235 OC This standard is initially published on green paper for the needs
4、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 by the manufacturers of the Member countries. After examination and signature of the AECMA Standard Checking Centre (N
5、PS) 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 aecma 1987 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo repro
6、duction or networking permitted without license from IHS-,-,-Issue P 1 prEN2753 Page 3 1 Scope This standard specifies requirements for single lug, counterbored, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, the dimensions of which are in conformi
7、ty with IS0 3168. 2 Field of application These nuts are intended for use in aircraft assemblies, in which the fasteners are mainly subjected to shear loads. The counterbore of nuts with thread diameter equal to or greater than 4 mm is deep enough to accommodate a bolt shank in excess of assembly thi
8、ckness, as well as the incomplete threads, The 3 mm diameter nut has no counterbore. They are intended to be used with threaded parts of 1100 MPa i) tensile strength classification. O The cadmium plating restricts the application to temperatures not exceeding 235 OC. 3 . References IS0 3168, IS0 585
9、511, IS0 585512, IS0 5858, ). IS0 8788, Aerospace - Metric Fasteners - Nuts, anchor, self-locking, fixed, one lug, with counterbore - Dimensions Aerospace construction - MJ Threads - Part 1 : Basic profile Aerospace construction - MJ Threads - Part 2 : Dimensions for bolts and nuts Aerospace - Faste
10、ners - Self locking nuts with maximum operating temperature less than or equal to 425 OC - Procure- ment specifcation 2) Aerospace - Fasteners - Tolerances of form and position for nuts 2) 1) This strength class applies at room temperatures. e 2) In preparation Previous page is blank Copyright Assoc
11、iation Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- AECMA PREN2753 87 M LOL231L OOOLiLO9 7 M Issue P 1 prEN2753 Page 4 EN2000, Aerospace series - Quality assurance requi
12、rements for the manufacture and procurement of EN aerospace standard products EN2133, Cadmium plating of steels with maximum specified tensile strength equal or less than 1450 MPa, and copper and copper alloys - Aerospace series EN2424, Identification marking of standard fasteners - Aerospace series
13、 EN2491, Aerospace series - Molybdenum disulfide solid film lubricants for application to removable fasteners . in titanium, titanium alloy, corrosion resisting steel and cadmium plating steel i) EN2542, Aerospace series - Steel FE-PL43S - 1250 Rm 1400 MPa Bar and wire - De 3 40 mm - Only for Erevai
14、hg torque nuts 2) EN2543, Aerospace series - Steel FE-PL43S - 1250 Rm 1400 MPa - Sheets and strips - 0,3 - A - 2 mm - Only for-prevailing troque nuts 2) 4 Required characteristics 4.1 Configuration - Dimensions - Tolerances The configuration shall be in accordance with the figure ; the dimensions an
15、d tolerances shall conform to the values shown in the figure and in table 1, after cadmium plating but before Mos2 lubrication. 4.2 Surface roughness See figure. The values apply before cadmium plating and Mos2 lubrication, they do not apply to the thread, sheared-off edges and punched holes obtaine
16、d by normal methods of manufacture. 4.3 Materials Steel EN2542 or EN2543. 4.4 Surface treatment Cadmium plating EN2133, 5 ym minimum on the threads and all areas which can be contacted by a 20 mm diameter ball. On all other areas, a continuous deposit shall be present, but no minimum value is specif
17、ied. Lubrification by Mos2 EN2491 , mandatory on threads, optional on other surfaces. 2) In preparation. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-
18、,- AECMA PREN2753 87 m L0123Ll OOOYLLO 5 m Issue P 1 prEN2753 Page 5 Break sharp edges 0,l to 0,4 inm Detail X . Radius or chamfer Section Y-Y + 0,2 2 holes S 0 Plain rivet holes I I 1 Optiona flanges i (or reinforcements) . Optional : Countersunk or dimpled river hole 4). . ._ + 0,4 2 holes S o +0.
19、2 2 hole_c S o Dimpled hole Figure - Configuration Not stated details of form, are at manufacturers option. 3) For inspection requirements see clause 7. 4) Choice of realisation left to the manufacturer. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under
20、license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- AECMA PREN2753 87 LOL231L 0004LLL i Issue P i prEN2753 Page 6 ! .- 8 E E i3 I P . 00 06 h Co O v) - 5 L 8 t! .- P x ci .- O h e c .- m E O w u) O Q U .I .- s E e rc O u) a U E m L a I io AA . . I r
21、cv- rc O Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Issue P 1 prEN2753 Page 7 Option Plain rivet holes 5 Designation Hole code - Each nut shall on
22、ly be designated as in the following example : K Countersunk or dimpled rivet holes L Description Block NUT, ANCHOR Identity Block EN Number of EN Standard Table 2 Note : If necessary the originator code S9005 may be introduced between the description block and the .identity block. 6 Marking Each nu
23、t shall be marked in any of the positions shown on the figure in accordance with EN2424, Style F. 7 Conforming to IS0 5858 except for quality assurance requirements - See EN2000. Tech nical speci fica tion Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
