1、STD.AECMA PREN 3433-ENGL 1494 LO12311 O017270 74 111 Withdrawal approved AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of Dubiication to C3 Chairman prEN 3433 Edition P 2 November 1999 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AEC
2、MA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : Descriptors : Supersedes issue P 1 December 1989 Srie arospatiale Rondelles frein, en acier rsistant chaud, passives ENGLISH VERSION Aerospace series Loc kwas hers, heat resisting steel, passivated Luft- und R
3、aumfahrt Sicherungsbleche, aus hochwarmfestem Keilstahl, passiviert This “Aerospace Series“ Prestandard has been drawn up under the AECMA-Members. it has been technically approved by Subsequent to the publication oft rned Technical ECMA Standard Checking Centre (NPS) and formai the Member countries
4、it wiii be submitted as a draft European e for Standardization) for formal vote. I Replace page 1 of the previous issue by this page I 1999-1 1-30 AECMA Gulledelle 94 8-1200 BRUXELLES Mr Visconti aecma 1999 rp AECMA PREN3433 B7 LOi123_1_4 0005702 2 prEN 3433 PaGe 3 1 Scope and field of application T
5、his standard specifies the requirements of passivated steel lockwshers, for use with plain rounu ruts intended primariy for beariny retention in aerospice cotistruction. They are intended to be used in conjunction with related nut per EN 3655 fer temperatures up to 650 OC. 2 References IS0 2982-1 97
6、2, Rolling bearings - Locknuts, narrow series, and lockwashers with straight inner tab EN 2170, Heat resisting steel FE-PA91-HT - Solution treated - Sheets ncl strips a - 3 mm - Aerospace series 1) EN 2175, Heat resisting. steel FE-PA93-HT - Solution treated and precipitation treated - Sheets and st
7、rips a - 3 mm - Aerospace series 1) EN 2424, kerospixe series - Identification marking of standard fasteners 1) EN 2516, Aerospsce s-eries - Passivation of corrosion resistant steels 21 EN 3655, Aerospace series - Locknuts, round, for hook spanner, passivated, heat resisting steel, narrow series - C
8、lassification 600 MPa(ai ambient temperature) i650 OC 2). 3 Required characteristics 3.1 Configuration - Dimensions - Niasses See figure and table. 3.2 Materials Heat resisting steel EN 2170 or EN 2175. 3.3 Surface treatment Passivatiorr Eh 2516. - 1) Published as AECEA standard at the date of publi
9、calicn of the present standard. 2) In preparation at the date of publication of the present standard. Previous page is blank AECMA PREN3433 89 W 10L231L 0005703 Y W prEN 3473 I:qe 3 H X M equidistant key J - i .lalues, in rnicrometres, applv nrior to passivation. Fiqirre AECMA PREN3933 89 3imenr;ion
10、s in mil!iri?etres AECMA PREN3433 89 W LOL23LL 0005705 B W ;.irEN 3433 Page 6 4 Designation Each lockwasher shall only be designated as ir, the following example : Description block Identity block Eti5433-0 LOC K WASHER - Number of EN standard Diameter code (see table) - O - Note - If necessary the
11、originator code 19005 may be introduced between the desciption block and identity block. 5 Marking Each lockwasher shall be marked ti the position shown on the figure in accordance with the style C defined by EN 2424. 6 Technical requirements 6.1 Bend tests Bend the lockwasher through an angle of 90
12、 near the center of its diameter; the bend shall have a radius of not more than 0,5 B max, After two bending operatioris the lockwasher shall show no crack. These tests are to be done on 0,l % of each batch pi-oduced. The production lot is defined as follows : the production lot shall consist of finished lockwashers of the same basic part number and diameter formed by the same process from a single material cast produced as one continuous run: 6.2 Appearance The lockwasher shall be free from cracks, sharp e.dges ur c?ny other defects. -i-+-+ I /I P
