1、ASD STANDARD NORME ASD ASD NORM prEN 2648 Edition P 2 March 2010 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes issue P 1 of February 1987 a
2、nd will supersede EN 2648:1995 Descriptors: ENGLISH VERSION Aerospace series Washers, concave, in alloy steel, cadmium plated Srie arospatiale Rondelles concaves, en acier alli, cadmies Luft- und Raumfahrt Scheiben, fr Neigungsausgleich, aus legiertem Stahl, verkadmet This “Aerospace Series“ Prestan
3、dard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comme
4、nts. 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 review by users and formal agreement of ASD-STAN, it will
5、be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withd
6、rawing any national standards conflicting with the EN. Edition approved for publication 31 March 2010 Comments should be sent within six months after the date of publication to ASD-STAN Mechanic Domain Copyright 2010 by ASD-STAN prEN 2648:2010 (E) 2 Contents Page Foreword2 1 Scope 3 2 Normative refe
7、rences 3 3 Required characteristics.3 4 Designation 5 5 Marking .5 6 Qualification .5 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Pr
8、ocess Manual, this standard has received approval for Publication. prEN 2648:2010 (E) 3 1 Scope This standard specifies the characteristics of concave washers, in alloy steel, cadmium plated, maximum operating temperature 235 C. They are intended to be used with nuts to EN 2647. 2 Normative referenc
9、es The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2133, Aerospace series Cadmium plating of s
10、teels with specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys EN 2424, Aerospace series Marking of aerospace products EN 2448, Aerospace series Steel FE-PL1503 (35CrMo4) 900 MPa Rm 1 100 MPa Bars De 40 mm EN 2542, Aerospace series Steel FE-PL1502 (25CrMo4) Annealed Bar and
11、 wire De 40 mm for prevailing torque nuts EN 2647, Aerospace series Nuts, hexagonal, self-locking, ball seat, in alloy steel, cadmium plated, MoS2 lubricated Classification: 900 MPa (at ambient temperature) / 235 C EN 3330, Aerospace series Steel FE-PL1503 (35CrMo4) Annealed Bar and wire De 40 mm fo
12、r prevailing torque nuts 3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. 3.2 Materials Steel FE-PL1502 (25CrMo4), chemical composition in conformity with EN 2542, charac
13、teristics after manufacture: 1 250 MPa Rm 1 400 MPa, 40 HRC 43. or Steel FE-PL1503 (35CrMo4), chemical composition in conformity with EN 3330 or EN 2448 or equivalent, characteristics after manufacture: 1 250 MPa Rm 1 400 MPa, 40 HRC 43 3.3 Surface treatment EN 2133, 8 m to 14 m. prEN 2648:2010 (E)
14、4 Values in micrometres apply prior to surface treatment.Remove sharp edges 0,1 to 0,4. Key 1 R spherical 2 Marking Figure 1 Table 1 D1D2R S T Diameter code a 0,2 0 0,2 0,5 0 0,1 Mass b 050 7 10,3 8 2 8,5 0,8 060 8,2 13 9 2,5 9,2 1,4 080 11 17 12,5 3,5 13,25 3,3 100 13,8 21 16 4 16,9 6,5 120 16,5 24
15、 18 5 19,5 8,9 aCorresponds to the diameter code of the nut EN 2647. bApproximate values (kg/1 000 pieces), calculated on the basis of 7,85 kg/dm3, given for information purposes only 6,31,6prEN 2648:2010 (E) 5 4 Designation EXAMPLE Description block WASHER Identity block EN2648-060 Number of this standard Diameter code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style F plus diameter code. See Figure 1. 6 Qualification See EN 2647.
