1、STD-AECMA PREN 3434-ENGL 1778 LOL23LL 001477b TTO Edition approved for publication Comments should be sent within six months after the date of Dublication to AECMA STANDARD NORME AECMA AECMA NORM C3 Chairman prEN 3434 Edition P 3 August 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTR
2、IES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.30 Supersedes issue P 2 September 1997 Descriptors: ENGLISH VERSION Aerospace series Nuts, hexagon, slotted I castellated, self-locking, in steel, cadmium plated, MOS, lubricated Classification
3、: 900 MPa (at ambient temperature) / 235 OC Srie arospatiale crous hexagonaux crneaux, freinage interne, en acier, cadmis, lubrifis MOS, Classification: 900 MPa ( temprature ambiante1 1235 OC Luft- und Raumfahrt Sechskant-Kronenmuttern, selbstsichernd, aus Stahl, verkadmet, Mos,-geschmiert Klasse: 9
4、00 MPa (bei Raumtemperatur) 1235 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association 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 concer
5、ned 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 affected, physically or functionally, without re-identification of the standard. After examination
6、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 Committee for Standardization) for formal vote. 1998-08-31 AECMA Guiledelle 94 8-1 200 BRUXELLES Mr Visco
7、nti I I aecma 1998 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STDmAECNA PREN 3434-ENGL 1778 E LOL23LL 1134777 737 W Page 3 prEN 3434: 1998 1 Scope
8、 This standard specifies characteristics of self-locking hexagonal slotted/castelleted nuts, in steel, cadmium plated, MOS, lubricated. Classification: 900 MPa 1) / 235 OC 2) 2 Normatives references IS0 5855-2 Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts IS0 5858 Aerospace -
9、Self-locking nuts with maximum operating temperature less than or equal to 425 OC - Procurement specification IS0 8788 Aerospace - Fasteners - Tolerances of form and position for nuts EN 2000 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacture
10、rs EN 2133 Cadmium plating of steels with maximum specified tensile strength equal to or less than 1 450 MPa and copper and copper alloys - Aerospace series 3) EN 2367 Aerospace series - Split pins in steel EN 2753 EN 2424 Aerospace series - Marking of aerospace products EN 2491 Aerospace series - M
11、olybdenum disulphide dry lubricants - Coating methods EN 3042 Aerospace series - Quality assurance - EN aerospace products - Qualification procedure TR 3791 Aerospace series - Materials for all metal self-locking nuts and thin wall inserts of temperatures classes I425 OC 4) 1) Corresponds to the min
12、imum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the is able to withstand, without permanent alteration to its original characteristics, after ambient temperature
13、 has been restored. The maximum temperature is conditioned by the cadmium plating. 3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Technical Report at the date of publication of this standard Previous page is blank Copyright Association Europeene des
14、Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - STD-AECMA PREN 3434-ENGL 1978 LOL23LL 0014778 873 = Page 4 prEN 3434: 1998 3 Required characteristics 3.1 See figure 1 and table 1. Conf
15、iguration - Dimensions - Masses Dimensions and tolerances are expressed in millimetrec and apply after cadmium plating but before MOS, lubricating. Details of form not stated are at the manufacturers option. 3.2 IS0 8788 Tolerances of form and position 3.3 Materials TR 3791 3.4 Surface treatments EN
16、 2133, 5 pm min. on threads and all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present. EN 2491, thickness not specified Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AE
17、CMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN 3q34-ENGL 3798 = 1012311 0034779 70T Page 5 prEN 3434: 1998 code 050 Remove sharp edges 0,l to 0,4. min. MJ5x0,8-4H6H 6.5 6 I x-x 1 6,3 1 1 2,9 1 ;:; 1 12,l 6,3 11,3 0,8 2,7 7,3 2 3.4 1,4 13,6 7,2 12
18、,8 0,9 3,2 9,l 8,3 3,9 3,2 111 140 MJ141,5-4H5H 17.7 16 I 1 I I I I I I I I I hl 3 180 MJ181,5-4H5H 24.5 22 29,l 16,2 28 2,l 6,5 19,2 18,4 9,4 30 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or network
19、ing permitted without license from IHS-,-,- - STD-AECMA PREN 3Li34-ENGL 3978 3012333 0034780 Li23 Page 6 prEN 3434: 1998 4 Designation EXAMPLE: Description block Identity block EN3434-080 Number of this standard Diameter code (see table 1) NOTE: If necessary, the code 19005 shall be placed between t
20、he description block and the identity block. 5 Marking EN 2424, style N. See figure 1. 6 Technical specification IS0 5858, except for: - Self-locking torque limited to 5 assemblies and disassemblies at ambient temperature; - Approval of manufacturers: see EN 2000; - Qualification of products: see EN 3042. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
