1、, -.- Edition approved for publication 14 th September 1987 JI AECMA PREN3LSb 87 U 10. - - I - 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 O O O O A. E.C. M .A. STAN DARD NORME A.E.C.M.A
2、. A.E.C.M.A. NORM prEN 3196 Issue P 1 September 1987 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Nuts, self-locking, hexagonal, in heat resisting steel FE-PA92HT (A28
3、6), silver coated Classification : 1 1 O0 MPa/425 OC Srie arospatiale crous hexagonaux, freinage interne, en acier rsistant chaud FE-PA92HT (A286). argent Classification : 1 1 O0 MPa/425 OC Luft- und Raumfahrt Sechskantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA92HT (A286). versilbert, K
4、lasse : 1 1 O0 MPa/425 OC This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved b y the experts of the con
5、cerned AECMA Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination
6、 and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote. AECMA PREN349b 87 a LO12311 0004963 T ai Issue P i prEN31
7、96 Page 3 1 Scope and field of application This standard specifies the dimensions of self-locking, silver.coated hexagonal nuts with flange and MJ-threads in heat resisting steel FE-PA92HT (A286) according to EN2399 for. aerospace applicatiods, Eaximum test temperature of the material 425 OC. 2 Refe
8、rences IS0 5855/1, IS0 5855/2, IS0 8788, EN2399 , EN2424, EN2786, EM3152, 3 Required Aerospace construction - MJ threads - Part 1 : Basic profile Aerospace construction - MJ threads - Part 2 : Dimensions for bolts and nuts Aerospace - Fasteners - Tolerances of form and position for.nuts 1) Heat resi
9、sting steel PE-PA92HT - Rm - 900 NPa - Bars for forged bolts D 25 mm - Aerospace series - Identification marking of standard fasteners - Aerospace series Aerospace series - Electrolytic silver plating of metals, except titanium, aluminium and their alloys 1) Aerospace series - Nuts, self-locking, in
10、 heat resisting steel PE-PAgSHT, classification i100 MPa/425 “C - Technical specifi- cation 1) characteristics 3.1 Configuration shall be in accordance with the figure ; dimensions, tolerance 2) and masses shall conform with the figure and table 1. Details of form, not stated are at the manufacturer
11、ls option. Dimensions are after coating. 3.2 Material Heat resisting steel FE-PA92HT according to EN2399. 3.3 Surface treatment Silver.coat to EN2786, coating thickness 5 to i5 fim. On nuts &U6 and larger, the coating thickness shall be not less than 5 pm, measured at the pitch diameter. Nuts W5 and
12、 smaller shall show complete coating coverage on the threads. Configuration - Dimensions - Tolerances i) In preparation 2) In conformity with IS0 8788 for.tolerances of form and position. Previous page is blank , I tA_ECJlA_PREN3lJb 87 L0123LII 0004962 II = Issue P 1 prEN3196 Page 4 Ihese values are
13、 lo be applied before silver coating, Threads surface niti be achieved by . narnni methods of nanufncture Farn oui o round in this area to achieve the setf-iocking torque requirements tool narks acceptable Chaaler,radius not be convex or broken edge / Ltnrking in / -z#k Ihese areas pernissibie Remov
14、e sharp edges 0,l to 0.4 nn Figure - Configuration Table 1 - Dimensions and masses netres -1 Dimensions min. Thread Designation min. MJ 305 -4H6H - max. 6 - max, 3 - Code 030 - max. - 040 O50 - 4 5 - 0,2 Oll 0,2 Oll 060 MJ 6xll0-4H5H I 7,6 10,6 070 MJ 7x1,O -4H5H I 8,7 12,l 7,3 0,2 0,13 8,3 0,2 0113
15、 10,3 0,3 0,13 12,3 0,3 0,15 6,25 I 120 - 13,l - _- .i) All forms of entry (radius or chamfer) optional within these Limiting dimensions. 2) Thread in conformity with 1505855 part 1 and part 2. In self-locking zone the tolerances apply before forming 3) Across flats dimensions apply before forming o
16、ut of round, but finished nuts shall fit a standard socket wrench 4) Wrench pad engagement. 5) These values apply before forming out of round out of round. AECMA PREN3LSb 7 W LOB23BL 000L1b3 3 Issue P i prEN3196 Page 5 Diameter code I a 4 Designation Each hexagonal nut shall only be designated as in
17、 the following example: Description block Identity block EN31 96-050 Number of EN S-and rd Thread code Marking style Note: If necessary, the design code S9005 may be introduced between the description block and the identity block. 030 to 040 050 to 120 5 Marking O F C Each hexagonal nut shall be marked in the position shown in the figure in accordance with the style shown in table 2 as defined by EN2424. Table 2. 6 Technical specification The hexagonal nuts shall conform to the requirements of EN3152. a
