1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2880 Edition P 1 June 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES AECMA) Guiledelie 94 - 6-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.30 Descriptors: ENGLISH VERSION Aerospace series Nuts, anchor, sel
2、f-locking, fuel resistant, sealing, floating, two lug, with counterbore, in alloy steel, cadmium plated, Mos2 lubricated Classification: 900 MPa (at ambient temperature) / 120 OC Srie arospatiale Luft- und Raumfahrt crous river, freinage interne, tanches au carburant, flottants, double patte, en aci
3、er alli, cadmis, lubrifis Mos2 Classification : 900 MPa ( temprature ambiante) I 120 OC Annietmuttern, selbstsichernd, druckdicht, kraftstoffbestnding, avec chambrage, beweglich, beiderseitiger Flansch, mit zylindrischer Aussenkung, aus legiertem Stahl, verkadmet, MoSz-geschmiert Klasse: 900 MPa (be
4、i Raumtemperatur) I 120 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 experts of the concerned Techn
5、ical 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. After examination and signa
6、ture of the AECMA Standard Checking Centre INPS) 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 coDies can be SUDDlkd bv B.N.A.E. - Technooolis 54 -
7、199. rue Jean-Jacques Rousseau - 921 38 ICSY-LES-MOULINEAUX CEDEX Comments should be sent within six months C3 Chairman I after the date of publication to Edition approved for publication 1998-06-30 AECMA Guiledelie 94 B-1200 BRUXELLES Mr Arena I I aecma 1991 Page 3 prEN 2880: 1998 STD-AECMA PREN 28
8、80-ENGL 1778 W 101231Z 0034827 b5 1 Scope This standard specifies the characteristics of self-locking, fuel resistant, sealing, floating, two lug anchor nuts, with counterbore, in alloy steel, cadmium plated, Mos2 lubricated. Classification: 900 MPa 1) / 120 OC 2) 2 Normative references IS0 5855-2 I
9、S0 5858 IS0 8788 IS0 8940 EN 2000 EN 2133 EN 2424 EN 2491 EN 3042 MIL-R-6855E TR 3791 Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts Aerospace - Self-locking nuts with maximum operating temperature less than or equal to 425 OC - Procurement specification Aerospace - Fasteners -
10、 Tolerances of form and position for nuts Aerospace - Nuts, anchor, self-locking, sealing, floating, two lug, with counterbore, classifications 900 MPa / 120 OC, 900 MPa / 175 OC and 900 MPa / 235 O- Dimensions Aerospace series - Quality assurance - EN aerospace products - Approval of the quality sy
11、stems 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 lubricants - Coating
12、methods Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Rubber, Synthetic, Sheets, Strips, Molded or Extruded Shapes, General Specification For 4) Aerospace series - Materials for self-locking nuts, threaded inserts and screw thread inserts of temperature class
13、es I425 OC 5) 1) Corresponds 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
14、 characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the sealing material. 3) Published as AECMA Standard at the date of publication of this standard 4) Published by: Department of Defense (DoD), the Pentagon, Washington, D.C. 20301, USA 5) Publish
15、ed as AECMA Technical Report at the date of publication of this standard Previous page is blank STD-AECMA PREN 2880-ENGL 1778 LO12311 OOL483CI 887 Page 4 prEN 2880: 1998 3 Required characteristics 3.1 See figure 1 and table 1. Configuration - Dimensions - Masses Dimensions and tolerances are : in co
16、nformity with IS0 8940, expressed in millimetres and apply after cadmium plating but before Mos2 lubrication. Details 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, fue
17、l resistant per MIL-R-6855, class 1, grade 60 or equivalent 3.4 Surface treatments Cage and seal retainer: EN 2133, 5 pm min. on all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present. Nut element: - EN 2133, 5 pm min. on all surfac
18、es 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, mandatory on threads, optional on other surfaces. STDSAECMA PREN 2880-ENGL 1598 W 1012311 OOLLi831 713 M Diameter code 050 060 080 Remove sharp edges
19、0,l to 0,4. Thread 1) E F G H J K 1 M O S W Mass2) + 0,2 min. min. max. max. max. max. max. O max. MJ5xOr8-4H6H 9,5 19 6 3,4 16,2 14,4 24,6 7,9 12,5 14,4 4,3 MJ6xl-4H5H 11 22 7 19,2 17 29 9,5 16 17,4 7 MJ8x1-4H5H 13 26 9 20,3 19,4 32,5 11,3 18,5 3 18,5 10 2,s . 4,l Choice of flange at manufacturers
20、discretion - I 2,8rnax. I I Page 5 prEN 2880: 1998 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
21、radial float of nut element: 0,5 4) Lug thickness at the rivet location Figure 1 Table 1 1) In accordance with IS0 5855-2. In the self-locking zone the tolerances apply before forming out-of-round. 2) Approximate values (kg/l O00 pieces), given for information purposes only - STDSAECHA PREN 2880-ENG
22、L 1778 M LO12311i 0034832 b5T = Description block NUT Page 6 prEN 2880: 1998 Identity block 4 Designation EXAMPLE: 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.
