1、AECMA STANDARD NORME AECMA AECMA NORM prEN 4390 Edition P 1 April 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 1 O - Fax. (32) 2 775 81 1 1 ICs : 49.040.20 Descriptors : ENGLISH VERSION Aerospace series Nuts, anchor,
2、 self-locking, floating, self-aligning, two lug, in heat resisting steel, silver plated, Classification : 900 MPa (at ambient temperature) / 425 OC Srie arospatiale crous river, freinage interne, flottants, orientables, double patte en acier rsistant chaud, argents Classification : 900 MPa ( temprat
3、ure ambiante) I425 OC Luft- und Raumfahrt Annietmuttern, selbstsichernd, schwenkbar, beiderseitiger Flansch, aus hochwarmfestem Stahl, versilbert Klasse : 900 MPa (bei Raumtemperatur) I425 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Associ
4、ation of Aerospace industries). It 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 shal
5、l not be 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 submi
6、tted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX I Comments should be sent within six months after the date of public
7、ation to I Edition approved for publication 1997-04-30 AECMA Gulledelle 94 B-1200 BRUXELLES C3 Chairman Mr Arena aecma 1997 - STD-AECMA PREN 4370-ENGL 1777 LOL23Ll OOLL575 520 = Page 3 prEN 4390 : 1997 1 Scope This standard specifies the characteristics of self-locking, floating, self-aligning, two
8、lug anchor nuts, in heat resisting steel, silver plated. Classification : 900 MPa 1) / 425 OC 2) 2 Normative references IS0 5855-2 IS0 5858 IS0 8788 IS0 12273 EN 2000 EN 2424 EN 2786 EN 3042 TR 3791 Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts Aerospace - Self-locking nuts w
9、ith maximum operating temperature less than or equal to 425 OC - Procurement specification Aerospace - Fasteners - Tolerances of form and position for nuts Aerospace - Nuts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads - Classification : 900 MPa (at ambient temperature) /
10、235 OC, 900 MPa (at ambient temperature) / 31 5 OC, 900 MPa (at ambient temperature) / 425 OC - Dimensions 3) Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Aerospace series - Marking of aerospace products Aerospace series - Electrolyti
11、c silver plating of fasteners 4) Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Materials for all metal self-locking nuts and thin wall inserts of temperature classes I425 OC 5) 1) Corresponds to the minimum tensile stress which the nut is a
12、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
13、perature is conditioned by the dimensions. 3) In preparation at the date of publication of this standard 4) Published as AECMA Prestandard at the date of publication of this standard 5) Published as AECMA Technical Report at the date of publication of this standard Previous page is blank Page 4 prEN
14、 4390 : 1997 3 Required characteristics 3.1 Configuration - Dimensions - Masses See figure 1 and table 1. Dimensions and tolerances are in conformity with IS0 12273, expressed in millimetres and apply after surf ace treatment. Details of form not stated are at the manufacturers option. 3.2 IS0 8788
15、Tolerances of form and position 3.3 Materials TR 3791 3.4 Surface treatment EN 2786, thickness : - on external surfaces : 5 pm to 15 pm ; - on pitch diameter : 5 pm min. for nuts MJ6 and larger. Nuts MJ5 shall show complete coverage over complete profile. Page 5 prEN 4390 : 1997 Diameter code 050 06
16、0 080 Remove sharp edges 0,l to 0,4. Thread 1) EFHK min. max. MJ50,8-4H6 8,75 17,5 3,5 15,2 MJ6xl-4H5H 4 17 MJ8xl-4H5H 5 20,5 12,7 25,4 1x/ Roa t inclusive L max. 23,7 31,6 32,6 1) These values in micrometres apply before surface M N 2) P R S T Z Mass 3) Radial float max. max. min. % O max. min. + 0
17、2 8,3 6,6 7,2 0,7 2,6 10,2 7,6 7,a 5,8 11,8 1,l 11 3,5 3 8,4 9 03 3 2,5 0,75 Y-Y Threaded element Form out-of-round in this area to achieve -J-4 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.
18、2) 8O minimum alignment in any direction from central position 3) Tooling marks are permitted in this area. Figure 1 Table 1 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 (kg/
19、l O00 pieces), given for information purposes only - STD-AECMA PREN Li390-ENGL 3997 3032333 0033578 23T m Page 6 prEN 4390 : 1997 4 Designation EXAMPLE : Description block Identity block EN4390-060 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 ; - Qualification of products : see EN 3042.
