1、 STD-AECMA PREN 4417-ENGL 1777 E 1012311 00142b7 25b E Edition approved for publication 1997-1 1-28 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months C3 Chairman after the date of publication to AECMA Gulledelle 94 Mr Arena B-1200 BRUXELLES prEN 4419 Edition P 1 Novembe
2、r 1997 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 1 1 ICs: 49.040.20 Descriptors: ENGLISH VERSION Aerospace series Washers, chamfered, with counterbore, in alloy steel, cadmium plated Srie aros
3、patiale Rondelles, fraises, avec chambrage, en acier alli, cadmies Luft- und Raumfahrt Stulpscheiben, aus legiertem Stahl, verkadmet This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green pa
4、per 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 interchangeability is af
5、fected, ph ysically 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 to CEN (European Committ
6、ee for Standardiza tion) for formal vote. Page 3 prEN 4419: 1997 1 Scope This standard specifies the characteristics of chamfered washers, with counterbore, in alloy steel, cadmium plated, for use in aerospace applications. 2 Normative references EN 2000 Aerospace series - Quality assurance - EN aer
7、ospace products - Approval of the quality system of manufacturers EN 2133 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 1) EN 2424 Aerospace series - Marking of aerospace products EN 2438
8、 Steel FE-PL62 - 900 MPa I R, I 1 100 MPa - Bars De I 40 rnm - Aerospace series 2) 3 Required characteristics 3.1 See figure 1 and table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. Configuration - Dimensions - Masses 3.2 Materials EN 2438 or bars in s
9、teel FE-PL 2102 of diameter I70 and strength class 900 MPa I R, I 1 100 MPa. 3.3 Surface treatment EN 2133, 8 pm to 14 pm 1) Published as AECMA Standard at the date of publication of this standard 2) Published as AECMA Prestandard at the date of publication of this standard Previous page is blank ST
10、D-AECMA PREN I111/9-ENGL 1777 I 10123LL 0034273 704 I Page 4 prEN 4419: 1997 Values in micrometres apply prior to surface treatment. 7 171 Remove sharp edges 0,l to 0,4. Diameter 120 150 I 170 I 300 t%+ 400 I 450 I 500 J,L 10 18 20 23 22 25 25 28 28 32 30 34 32 37 35 42 40 48 45 56 50 62 R 0.6 f 0,l
11、 1 Dl Figure 1 Table 1 O, O4 CodeA Code B Code C Mass 1 H G H G H G CodeA CodeB CodeC +0,3 O O +0,2 O +0,2 O +O2 o -0,2 -0,2 o -0,2 o -0,2 o 6,2 13 4 515 2,8 2,4 3,4 1,6 8,2 16 3,1 41 2 5,6 2,8 10,2 18 3,8 4,9 6,5 4,l 1 i6 41 5 6 1) Approximate values (kg/l O00 pieces), calculated on the basis of 7,
12、85 kg/dm3, given for information purposes only STDmAECMA PREN 4917-ENGL 1797 1OL23LL O014272 8iD Page 5 prEN 441 9: 1997 Description block WASHER 4 Designation EXAMPLE: Identity block EN441 9A200 Ir Number of this standard Thickness code (see table I) NOTE: If necessary, the code 19005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style C 6 Quality assurance EN 2000
