1、CEN PREN*3020 92 3404589 O031836 173 W Edition approved for publication 1992-08-31 A. E.C. M .A. STAN DARD NOR ME A.E.C. M.A. A.E.C.M.A. NORM Comments should be sent within six months C8 Chairman after the date of publication decision A E.C M A M. WILLIAMS prEN 3020 Issue P 2 August 1992 UDC : EDITE
2、 PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATRIEL AEROSPATIAL Technopolis - 175. rue Jean-Jacques Rousseau - F-92138 Issy-les-Moiilineaux Cdex - T1 (1) 47 36 98 76 Supersedes issue P1 October 1989 Key words : ENGLISH VERSION Aerospace series Self-locking plate nuts, floating, two-lug, in hea
3、t resisting steel silver plated (at ambient temperature) /650 OC FE-PA92HT (A286). Classification : 1 I O0 MPa Srie arospatiale crous river freinage interne, flottants, double patte, en acier rsistant chaud argents Classification : 1 100 MPa ( temprature ambiante) / 650 OC FE-PA92HT (A286). Luft- un
4、d Raumfahrt Selbstsichernde Annietrnuttern, beweglich, beidseitiger Flansch, aus hochwarmfestem Stahl versilbert (bei Raumtemperatur) /650 OC FE-PA92HT (A286). Klasse : 1 1 O0 MPa This .Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Const
5、ructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. If has been technically approved by the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not b
6、e changed to an extent that 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
7、 a draft European Standard to CEN (European Committee for Standardization) for final vote. CEN PRENM3020 92 3404589 0031837 OOT prEN 3020 Page 3 1 Scope and field of application This standard specifies the characteristics of self-locking, floating plate nuts in FE-PA92HT, silver plated, for aerospac
8、e applications. Ciassification : 1 1 O0 MPa l) / 650 OC 2, 2 References IS0 5855-2, Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts EN 2399, EN 2424, EN 2786, EN 3004, EN 3638, EN 3639, Heat resisting steel FE-PA92-HT - R, 2 900 MPa - Bars for forged bolts - D I 25 mm - Aerospa
9、ce series 3, Aerospace series - Identification marking of standard fasteners 3, Aerospace series - Electrolytic silver plating of fasteners 4, Aerospace series - Nuts, self-locking, in heat resisting steel FE-PA92HT (A2861 - Classification : 1 100 MPa / 650 OC - Technical specification 5, Aerospace
10、series - Heat resisting steel FE-PA92HT - Solution treated - Sheets and strips - a s 3 mm 4) Aerospace series - Heat resisting steel FE-PA92HT cold worked and softened - Bars and wires for continuous cold forging or extrusion of fasteners - 3 mm L D I 30 mm - R, 2 900 MPa 4, 3 Required characteristi
11、cs 3.1 Configuration - Dimensions - Tolerances - Masses See figure 1 and table 1. Dimensions and tolerances are in millimetres. They apply after silver plating. 3.2 Material Nut element : EN 2399, EN 3638 or EN 3639 Cage : EN 3638 3.3 Surface treatment EN 2786, only nut element Thickness : - Externa
12、l surface : 5 pm bis 15 pm , - Thread 2 MJ 6 : 5 ,um min. shall be measured at the pitch diameter ; - Thread MJ 5 : shall show complete coverage, without thickness requirement. l) The strength class of the bolt concerned which can withstand the load at ambient temperature when tested at 100 % load w
13、ithout cracking or breaking of the nut. 2, Maximum test temperature of the parts 3, Published as AECMA standard at the date of publication of the present standard 4) In preparation at the date of publication of the present standard 5, Published as AECMA pre-standard at the date of publication of the
14、 present standard Previous page is blank Code OE0 060 070 - - CEN PREN*3020 92 0 3404589 Oil35838 T4b I prEN 3020 Page 4 Values applicable before silver plating. Thread surface will be as achieved by normal methods of manufacture. 1 ( 7) i Y Radial float in all lines (see table) Form out-of-round in
15、 this area I to achieve the self-locking 2 Marking in these areas n requirement. (tooling marks permissible) * Chamfer or radius Y .-.-=-i i v -. - - z-z IT- max. Oll - Remove sharp edges Oll to 0,4 Details of form not stated are left to the manufacturers discretion. Figure 1 Table 1 Mass Thread D E
16、 F K L M N P R S W Radial ku/lOOO O + 0.2 float parts MJ50,8-4ti6H 19 9,s 19- 12 25.2 7 0,6 6.5 2.4 2,5 3 2,54 MJ6xl-4H5H 22 11 22 13,5 29,2 9 MJ7xl-4H5H 26 13 26 16 33,2 10 0,8 8.5 3.2 3.5 . = Designation max. rnax. max. max. nom. - 0,5 min. O . nom. 2 min. -I_ _.- 7,5 3.5 015 - I In accordance wit
17、h IS0 5855-2. In the self-lockiriu zone, the tolerances apply before formirlu out-of-round. CEN PREN*3020 92 m 3404569 0031839 982 prEN 3020 Page 5 4 Designation Example : I Description block i Identity block ! EN3020-060 Number of this standard Thread code (see table 11 Note : If necessary, the originator code 19005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style N, as indicated on the figure 1 6 Technical specification EN 3004
