1、AECMA PREN2852 87 W L0123LL _ OOOLi270 S-Iii, - prEN2852 A.E.C.M.A. STANDARD NORME A.E.C.M.A. Issue P 1 A.E.C.M.A. NORM February 1987 Edition approved for publication DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS - TL. 45-63-82-85 UDC :
2、 Comments should be sent within six months C3 Chairman Key words : ENGLISH VERSION Aerospace series Nuts, hexagonal, plain, normal height, normal across flats, heat resisting steel passivated Classification : 1 1 O0 MPa/650 OC Srie arospatiale Luft- und Raumfahrt crous hexagonaux, simples Sechskantm
3、uttern, hauteur normale, surplats normaux normale Hhe, normale Schlsselweite, en acier rsistant chaud passiv aus hochwarmfestem Stahl, passiviert Ciassification : 1 I O0 MPa/650 OC Klasse : 1100 MPa/650 “C This standard is initially published on green paper for the needs of AECMA-Members (Associatio
4、n 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 (NPS) and formal agreement of
5、the Official Services of the Member countries it will be published in its final version on yellow paper as an AECMA Standard. 16 February 1987 after the date of publication decision A.E.C.M.A. 88, Ed. Malesherbes 75008 PARIS - FRANCE Mr ARENA aecma 1987 Previous page is blank Issue P prEN2852 Page 1
6、 Scope This standard specifies the characteristics of plain hexagonal nuts in passivated heat resisting steel, with or without locking holes, the dimensions of which are in conformity with IS0 8279. 2 Field of application These nuts are intended for use in aircraft assemblies, subjected principally
7、to tension loading. They are intended to be used with bolts of 1100 MPa 2, tensile strength classification, at temperatures up to 650 OC. 3 References IS0 5855/1, IC0 5855/2, Aerospace Construction - MJ Threads - Part 1 : Basic profile Aerospace Construction - MJ Threads - Part 2 : Dimensions for bo
8、lts and nuts IS0 8279, IS0 8788, O IS0 9139, EN2000, EN2171, EN2398, EN2424, EN25 16, 4 Required O Aerospace - Plain hexagon nuts with strength classifica- tion 1100 MPa and maximum operating temperature 235 OC Aerospace - Fasteners - Tolerances of form and position for nuts i) Aerospace series - Nu
9、ts, plain and slotted - Technical specification 1) Aerospace series - Quality assurance requirements for the manufacture and procurement of EN aerospace standard products Heat resisting steel FE-PA92-HT - Rm 2 900 MPa - Bars - Aerospace series Heat resisting steel FE-PA92-HT - Rm 900 MPa - Bars for
10、machined bolts D - 25 mm - Aerospace series Identification marking of standard fasteners - Aerospace series Aerospace series - Passivation of corrosion resisting steel i) characteristics 4.1 Configuration - Dimensions - Tolerances Configuration shall be in accordance with the figure ; the dimensions
11、 and tolerances shall conform to the values shown in the figure and table 1 after passivation. The tolerances of form and position are in conformity with IS0 8788. 4.2 Surface roughness See figure. The values apply before passivation. They do not apply to the thread ; the surface roughness will be a
12、s achieved by normal methods of manufacture. 4.3 Materials Steel EN2171 or EN2398. 4.4 Surface treatment Passivation EN2516. O I 3 1) In preparation 2) This strength level applies at ambient temperature Issue P 1 prEN2852 Page 4 AECMA PREN2852 87 W LOLZ3LL OOOLI272 9 1i1 Break sharp edges 0,l to 0,4
13、 mm x- x Form wlthout lockwlre holes 90“ to120“ x-x Form wlth lockwlre holes IDimensions othedse as form without lockwire holes) -1 Figure - Configuratlon Rearing surface may be flat to Concm but shell not be convex 1) Form of contour, within limiting dimensions, at manufacturers option. 2) All form
14、s of entry (chamfer or radius) optional within these limiting 3) Applicable to both faces. O Flats may be tangential to but shall not intrude on (d M min. dimensions 160 180 EU16 x 1,5 - 4H5H 26,8 MJ18 x 1,s - 4H5H 30.2 19,2 21,2 18,4 20,4 200 MJ20 x 1,5 - 4H5H 33,6 code 020 025 030 max, min. 0,4 0,
15、2 0,lO 0913 0,3 O, 36 0,43 140 160 0,6 0,3 AECMA PREN2852 87 W LOL23LL 00134273 0 I issue P 1 prEN2852 Page 5 Table 1 - Dimensions and masses Dimensions in millimetres Thread i) E Code I Designation 1 min. min MI I 020 IMJ2 x 0,4 - 4H6H I 4,2 8 h12 4H6H I 050 IMJ5 x 0,8 - 4H6H I 8,7 q 17 993 I 3 29,
16、O 4H5H 18,9 I 120 IMJl2 x 1.25 - 4H5H I 21.1 h13 1: 14,4 16,O 13,l 12,3 I 140 1MJ14 x 1,5 - 4H5H I 24,s 15,2 I14,4 17,2 I16,4 I I I I 1 7 kg/1000 max, T 0,25 V - +0,2 2) min. Thread N 4) 0,85 399 230 0,5 0,2 4.4 2,4 16,l 46 10,7 L 12,o 13,4 62 I 0,18 10,52 i) In conformity with IS0 5855 parts 1 and
17、2. 3) Calculated on the basis of 7,85 kg/dm3. 4) Lockwire hole not provided for these diameters, 0 2) From either face, Issue P 1 prEN2852 Page 6 5 Designation Each nut shall only be designated as in the following example : Description Block - = Locking hole code I 100 = Thread code (see table 1) wh
18、ere the following codes apply : H = with locking holes i= without locking holes 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 the position shown on the figure in accordance with EN2424 according to the marking styles defined in table 2. Table 2 Thread code Marking style 020 to 040 G 050 to 070 E 180 to 200 7 Technical specification Conforming to IS0 9139 except for quality assurance requirements - See EN2000.
