1、STD-AECMA PREN ZbBO-ENGL 1778 1012311 0014b8b Tb9 Edition approved for publication 1998-08-31 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 B-1200 BRUXELLES prEN 2680 Edition P 3 August 1998 PUBLISHED BY THE EUROP
2、EAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.040.20 Supersedes edition P 2 September 1996 Descriptors: ENGLISH VERSION Aerospace series Nuts, anchor, self-locking, floating, self-aligning, two lug, in alloy
3、 steel, cadmium plated, Mos2 lubricated Classification: 900 MPa (at ambient temperature) / 235 OC Srie arospatiale crous river, freinage interne, flottants, orientables, double patte, en acier alli, cadmis, lubrifis Mos2 Classification: 900 MPa ( temprature ambiante) / 235 OC Luft- und Raumfahrt Ann
4、ietmuttern, seibstsichernd, schwenkbar, beiderseitiger Flansch, aus legiertem Stahl, verkadmet, Mos*-geschmiert Klasse: 900 MPa (bei Raumtemperatur) / 235 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It
5、 is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts 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
6、 interchangeability is affected, physically or functionally, without re-identification of the standard. After examination 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
7、to CEN (European Committee for Standardization) for formal vote. Nota - Extra coDies can be SLIDDlkd by B.N.A.E. - TechnoDolis 54 - 199, rue JeamJacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX C3 Chairman Mr Visconti aecrna 1998 STD-AECMA PREN 2bBO-ENGL 1998 = LOL23Ll 0014bA7 7T5 Page 3 prEN 268
8、0: 1998 1 Scope This standard specifies the characteristics of self-locking, floating, self-aligning, two lug anchor nuts, in alloy steel, cadmium plated, MoS2-lubricated. Classification: 900 MPa 1) / 235 OC 2) 2 Normative references IS0 5855-2 IS0 5858 IS0 8788 IS0 12273 EN 2000 EN 2133 EN 2424 EN
9、2491 EN 3042 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 - Tolerances of form and position for nuts Aerospace - Nuts, ancho
10、r, self-locking, floating, self-aligning, two lug, with MJ threads - Classification: 900 MPa (at ambient temperature) / 235 OC, 900 MPa (at ambient temperature) / 315 OC, 900 MPa (at ambient temperature) / 425 OC - Dimensions Aerospace series - Quality assurance - EN aerospace products - Approval of
11、 the 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 lubrica
12、nts - Coating methods Aerospace series - Quality assurance - EN aerospace products - Qualification procedure 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 nut is a
13、ble 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 maximum tem
14、perature 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 Previous page is blank 3 Required characteristics 3.1 See figure 1 and table 1. Configuration
15、- Dimensions - Masses Dimensions and tolerances are in conformity with IS0 12273, 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 position 3.3 Materials TR 3791 3.4 S
16、urface treatments EN 2133, 5 pm min. on threads and all surfaces which can be contacted by a 20 mm diameter ball. On ali other surfaces, a continuous deposit shall be present. EN 2491, thickness not specified, mandatory on threads, optional on other surfaces STD-AECMA PREN 2bO-ENGL 1778 = L0123LL 00
17、Lb7 778 Page 5 prEN 2680: 1998 Diameter code 050 060 080 Remove sharp edges 0,l to 0,4. Thread 1) E F H K L MN2) min. max. max. max. max. MJ50.8-4H6H 8,75 17,5 3,5 15,2 23,7 8,3 0,9 MJ6xl-4H5H 4 17 31,6 10,2 MJ8xl-4H5H 5 20,5 32,6 11,8 1,l . 12,7 25,4 Z -c ci- K -TiGGl I Y-Y H Convex washer Threoded
18、 element Form out-of -round in this oreo to achieve 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) 8O minimum alignment in any direction f
19、rom central position 3) Tooling marks are permitted in this area. Figure 1 Table 1 11 - Radial float 0,75 8,4 1) In accordance with IS0 5855-2. In the self-locking zone the tolerances apply before forming out-of-round. 2) Measured at the rivet hole location 3) Approximate values (kgll O00 pieces), g
20、iven for information purposes only STD-AECMA PREN 2b8O-ENGL 1998 1012311 00L4b70 47T Page 6 prEN 2680: 1998 4 Designation EXAMPLE: Description block Identity block EN2680-060 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. See figure 1. 6 Technical specification IS0 5858, except for: - Approval of manufacturers: see EN 2000; I l - Qualification of products: see EN 3042.
