1、AECMA PRENa4277 b W 101231l 0010552 O36 W Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to C3 Chairman prEN 4297 Edition P 1 May 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA)
2、 Gulledelle 94 - 6-1 200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : 49.040.20 Descriptors : ENGLISH VERSION Aerospace series Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in corrosion resisting steel, passivated Classification : 900 MPa (at amb
3、ient temperature) / 120 OC Srie arospatiale Luft- und Raumfahrt crous hexagonaux, Sechskantmuttern, freinage interne par bague plastique, hauteur normale, surplats normaux, en acier rsistant la corrosion, passives Classification : 900 MPa ( temprature ambiante) I 120 OC selbstsichernd mit Plastikrin
4、g, mit normaler Schlsselweite, aus korrosionsbestndigem Stahl, passiviert Klasse : 900 MPa (bei Raumtemperatur) / 120 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
5、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 affected, phys
6、ically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre INPSI 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 Standa
7、rdization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - ISS, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX 1996-05-31 AECMA Gulledelle 94 6-1 200 BRUXELLES Mr Arena I I I aecma 1996 AECIA PRENx41297 96 W 3032333 0030553 Ti2 Page 2 prEN 4297 : 199
8、6 Blank page - - AECPIA PREN*4297 b m 1012311 0010554 909 m Page 3 prEN 4297 : 1996 1 Scope This standard specifies the characteristics of hexagonal nuts, self-locking by plastic ring, normal height, normal across flats, in corrosion resisting steel, passivated. Classification : 900 MPa 1) / 120 OC
9、2). 2 Normative references IS0 5855-2 Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts IS0 5858 Aerospace - Self-locking nuts with maximum operating temperature less than or equal to 425 OC - Procurement specification IS0 8788 Aerospace - Fasteners - Tolerances of form and posit
10、ion for nuts EN 2000 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers EN 2424 Aerospace series - Marking of aerospace products EN 2516 Aerospace series - Passivation of corrosion resistant steels and decontamination of nickel base alloys
11、3) EN 3042 Aerospace series - Quality assurance - EN aerospace products - Qualification procedure 3 Required characteristics 3.1 See figure 1 and table 1. Dimensions and tolerances are expressed in millimetres and apply after surf ace treatment. Details of form not stated are at the manufacturers op
12、tion. Configuration - Dimensions - Masses 3.2 IS0 8788 Tolerances of form and position 3.3 Materials Threaded element : FE-PA1801 Plastic ring : polyamide 6.6 3.4 Surface treatment EN 2516, process class appropriate to the material 1) Corresponds to the minimum tensile stress which the nut is able t
13、o 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 tempera
14、ture is conditioned by the plastic ring. 3) Published as AECMA Standard at the date of publication of this standard Page 4 prEN 4297 : 1996 x-x Remove sharp edges 0,l to 0,4 “-I I ,/, b- Threaded element fi a O P c O O o Plastic ring - I) These values in micrometres apply before surface treatment. T
15、hey do not apply to threads the surface texture of which will be as achieved by usual manufacturing methods. 2) All forms of entry (chamfer or radius) option within these limiting dimensions 3) Form of contour within these limiting dimensions is at the manufacturers option. Diameter M may be tangent
16、ial to, but shall not intrude on the flats. Figure i Table 1 I 1) In accordance with IS0 5855-2 I 2) Approximate values kg/l O00 pieces), given for information purposes only Page 5 prEN 4297 : 1996 Description block NUT 4 Designation EXAMPLE : Identity block EN4297-050 Number of this standard Diamet
17、er 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.
