1、STD-AECMA PREN 2b47-ENGL 1777 W 1012311 0013503 119 D AECMA STANDARD NORME AECMA AECMA NORM prEN 2647 Edition 1 October 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 1 O - Fax. (32) 2 775 81 1 1 ICs: 49.040.20 Will su
2、persede EN 2647 Edition january 1995 Descriptors: Aircraft industry, fastener, nut, hexagonal nut, self-locking nut, alloy steel, cadmium plating, classification, dimension, surface treatment, screw thread, designation ENGLISH VERSION Aerospace series Nuts, hexagonal, self-locking, ball seat, in all
3、oy steel, cadmium plated, MOS, lubricated Classification: 900 MPa (at ambient temperature) / 235 OC Srie arospatiale Luft- und Raumfahrt crous hexagonaux, freinage interne, en acier alli, cadmis, lubrifis MOS, Classification : 900 MPa ( temprature ambiante) I235 OC Sechskantmuttern, selbstsichernd,
4、aus legiertem Stahl, verkadmet, Mos,-geschmiert Klasse: 900 MPa (bei Raumternperatur) / 235 OC orientables, fr Neigungsausgleich, This “Aerospace series“ Standard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on yell0 w paper
5、in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Edition approved for publication 1997-1 0-31 The equivalent versions in French and German languages can be supplied by B.N.A.E. -
6、 Technopolis 54 - 199, rue Jean-Jacques Rousseau 921 38 ISSY - LES - MOULINEAUX CEDEX - FRANCE I 1 aecrna 199 I STD-AECMA PREN Zb117-ENGL 1797 1OL231L OOL350q 055 Previous page is blank Page 3 prEN 2647: 1997 1 Scope This standard specifies the characteristics of self-locking hexagonal nuts with bal
7、l seat in alloy steel, cadmium plated, Mos2 lubricated. Classification: 900 MPa 1) / 235 OC 2) They are intended to be used with washers to EN 2648 or suitable parts, see annex A. 2 Normative references IS0 5855-2 IS0 5858 IS0 8788 EN 2000 EN 2133 EN 2424 EN 2491 EN 2648 EN 3042 TR 3791 Aerospace -
8、MJ threads - Part 2: Limit dimensions for bolts and nuts Aerospace - Self-locking nuts with maximum operating temperature I 425 OC - Procurement specification Aerospace - Fasteners - Tolerances of form and position for nuts Aerospace series - Quality assurance - EN aerospace products - Approval of t
9、he quality system of manufacturers Aerospace series - Cadmium plating of steels, with maximum specified tensile strength equal to or less than 1 450 MPa, copper, copper alloys and nickel alloys 3) Aerospace series - Marking of aerospace products Aerospace series - Molybdenum disulphide dry lubricant
10、s - Coating methods Aerospace series - Washers, concave, in alloy steel, cadmium plated Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Materials for all metal self-locking nuts and thin wall inserts of temperature classes I425 OC 4) 1) Corre
11、sponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, afte
12、r ambient temperature has been restored. The maximum temperature is conditioned by the cadmium plating. 3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Technical Report at the date of publication of this standard STD-AECMA PREN 2b1i7-ENGL 1777 10123LL
13、 DOL3505 T9L Page 4 prEN 2647: 1997 3 Required characteristics 3.1 See figure 1 and table 1. Configuration - Dimensions - Masses Dimensions and tolerances are expressed in millimetres and apply after cadmium plating but before Mos2 lubrication. Details of form not stated are at the manufacturers opt
14、ion. 3.2 IS0 8788 Tolerances of form and position 3.3 Materials TR 3791 3.4 Surface treatments EN 2133, 5 pm min. on threads and all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present. EN 2491, thickness not specified STD.AECMA PREN
15、 2b47-ENGL 1797 D 1OL2311 001350b 928 Page 5 prEN 2647: 1997 Diameter code Remove sharp edges 0,l to 0,4. Thread 1) 2) F 2) G H JMNPR T Mass 3) O min. f 0,2 max. min. min. min. min. - 0,5 x-x 050 060 A Marking (Ootional location, at MJ50,8-4H6H 6,5 6 10,3 7,05 5,5 1,7 2 2,05 8 7,s 1,7 h12 - MJ6xl-4H
16、5H 7,6 7 13 8,l 6,5 2,5 2,3 2,7 9 8,4 2,5 the manufacturers discretion) 100 120 Form out-of-round in this area to achiev the self-locking torq MJlOx1,25-4H5H 13,2 12 h13 21 11,95 10,5 4 3,3 2,95 16 15,l 11,3 MJ121,25-4H5H 15,5 14 24 13,46 12,5 4,5 4,5 2,65 18 16,9 17,4 1) These values in micrometres
17、 apply before surface treatment. They do not apply to threads the surface texture of which will be as achieved by usual manufacturing methods. 2) Tooling marks are permitted in this area. Figure 1 Table 1 I I I I I I I I I I I I I 080 I MJ8x1-4H5H )10,9 I 10 I I17 I 9,7 8,51 3 I3,2)2,5 112,5),751 6,
18、5 I 1 ) In accordance with IS0 5855-2. In self-locking zone the tolerances apply before forming out-of-round. 2) These dimensions apply before forming out-of-round, but finished nuts shall fit a standard socket wrench. I 3) Approximate values (kg/l O00 pieces), given for information puposes only 4 D
19、esignation EXAMPLE: Identity block I Description block NUT I EN2647-060 TT I Number of this standard Diameter code (see table 1) NOTE: If necessary, the code 19005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style N plus diameter code. See figure 1. 6 Tec
20、hnical specification IS0 5858, except for: - Approval of manufacturers: see EN 2000; - Qualification of products, nut and washer (EN 2648): see EN 3042. STD-AECMA PREN 2b47-ENGL 1777 W LOL23LL 0033508 7TO W Page 7 prEN 2647: 1997 I 050 Annex A (informative) Assembly 8,25 I 3,05 I A. 1 Dimensions See figure A.l and table A.1. 1 O0 120 Figure A.l Table A.l 13,95 4,75 16,25 5,25 I max. “I min. IW I Diameter code I I 080 I 11,4 I 4 I A.2 Examples See figures A.2 and A.3. Y + I y Figure A.2 Figure A.3
