1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2879 Edition P 1 June 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.30 Descriptors: ENGLISH VERSION Aerospace series Nuts, anchor, se
2、lf-locking, air resistant, sealing, floating, two lug, with counterbore, in corrosion resisting steel, passivated, Mos2 lubricated Classification: 900 MPa (at ambient temperature) / 235 OC Srie arospatiale crous river, freinage interne, tanches l?air, flottants, double patte, avec chambrage, en acie
3、r rsistant la corrosion, passivs, lubrifis Mos2 Classification : 900 MPa ( temprature ambiante) I235 OC Luft- und Raumfahrt Annietmuttern, selbstsichernd, druckdicht, luftbestnding, beweglich, beiderseitiger Flansch, mit zylindrischer Aussenkung, aus korrosionsbestndigem Stahl, passiviert, MoS2-gesc
4、hmiert Klasse: 900 MPa (bei Raumtemperatur) I235 OC This ?Aerospace Series? Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the exper
5、ts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. Af
6、ter examination and signature of the AECMA Standard Checking Centre INPSI 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 formal vote. Nota - Extra copies can be supplied by B.
7、N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ICSY-LES-MOULINEAUX CEDEX Comments should be sent within six months after the date of publication to I Edition approved for publication 1998-06-30 AECMA Gulledelle 94 B-1200 BRUXELLES C3 Chairman Mi Arena aecma 1998 Page 3 prEN 2879: 1
8、998 STDmAECMA PREN 2877-ENGL 3778 m 30323LL 0034834 422 m I Scope This standard specifies the characteristics of self-locking, air resistant, sealing, floating, two lug anchor nuts, with counterbore, in corrosion resisting steel, passivated, Mos2 lubricated. Classification: 900 MPa 1) / 235 OC 2) 2
9、Normative references IS0 5855-2 IS0 5858 Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts Aerospace - Self-locking nuts with maximum operating temperature I equal to 425 OC - Procurement specification Aerospace - Fasteners - Tolerances of form and position for nuts IS0 8788 IS0 8
10、940 EN 2000 EN 2424 EN 2491 EN 2516 EN 3042 AMS 33046 TR 3791 ss than o Aerospace - Nuts, anchor, self-locking, sealing, floating, two lug, with counterbore, classifications 900 MPa / 120 OC, 900 MPa / 175 OC and 900 MPa / 235 OC - Dimensions Aerospace series - Quality assurance - EN aerospace produ
11、cts - Approval of the quality systems of manufacturers Aerospace series - Marking of aerospace products Aerospace series - Molybdenum disulphide dry lubricants - Coating methods Aerospace series - Passivation of corrosion resistant steels and decontamination of nickel base alloys Aerospace series -
12、Quality assurance - EN aerospace products - Qualification procedure Silicone Rubber General Purpose 70 Durometer 3) Aerospace series - Materials for self-locking nuts, threaded inserts and screw thread inserts of temperature classes I425 OC 4) 1) Corresponds to the minimum tensile stress which the n
13、ut 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, after ambient temperature has been restored. The max
14、imum temperature is conditioned by the seal material. 3) Published by: Society of Automotive Engineers, Inc. (SAE), 400 Commonwealth Drive, Warendale, 4) Published as AECMA Technical Report at the date of publication of this standard P.A. 15096-0001, USA Previous page is blank - STD-AECMA PREN 2877-
15、ENGL 1798 LOL23Ll 0011i835 3b7 Page 4 prEN 2879: 1998 3 Required characteristics 3.1 See figure 1 and table 1. Configuration - Dimensions - Masses Dimensions and tolerances are: in conformity with IS0 8940, expressed in millimetres and apply after surface treatment but before Mos2 lubrication. Detai
16、ls of form not stated are at the manufacturers option. 3.2 IS0 8788 Tolerances of form and prosition 3.3 Materials Cage, seal retainer and nut element: TR 3791 Sealing ring: rubber, air resistant per AMS 3304 or equivalent 3.4 Surface treatments Cage and seal retainer: EN 2516 Nut element: EN 2491,
17、thickness not specified, mandatory on threads, optional on other surfaces STD-AECMA PREN 2877-ENGL 1778 LOL23LL 00L483b 2T5 Page 5 prEN 2879: 1998 J K L M O S /II min. min. max. max. max. max. max. O + 0,2 Remove sharp edges 0,l to 0,4. W Mass21 max. -i L Choice of flange at 1 manufacturers discreti
18、on Diameter Thread 1) E F G H code Y-Y W 2 I -round in this area to achieve the self-locking requirement Itooling marks permissiblel . 050 MJ50,8-4H6H 9,5 19 6 3,4 16,2 14,4 24,6 7,9 12,5 14,4 2,s 060 MJ6xl-4H5H 11 22 7 19,2 17 29 9,5 16 17,4 080 MJ8x1-4H5H 13 26 9 20,3 19,4 32,5 11,3 18,5 3 18,5 4
19、1- 2,8max. 4,3 7 10 1) These values in micrometres apply before surface treatment. They do not apply to threads, punched holes or sheared edges the surface texture of which will be as achieved by usual manufacturing methods. 2) Maximum bolt thread intrusion 3) Minimum radial float of nut element: 0,
20、5 4) Lug thickness at the rivet location Figure 1 Table 1 (20,3119,4132,511,3(18,5( (18,5( 1 I EFGH zone the tolerances apply before forming out-of-round. nation purposes only I Page 6 prEN 2879: 1998 Description block 4 Designation EXAMPLE: Identity block NOTE: If necessary, the code 19005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style N. See figure 1. 6 Technical specification IS0 5858, except for: - Approval of manufacturers: see EN 2000; - Qualification of products: see EN 3042.
