1、 STD*AECMA PREN 3792-ENGL 1992 LOL2311 CI013025 275 Edition approved for publication Comments should be sent within six months A. E.C. M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM C3 Chairman prEN 3742 Issue P 1 January 1992 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL
2、Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex -Tl. (1) 47.36.98.76 UDC : Key words : ENGLISH VERSION Aerospace series Nuts, hexagonal, slotted/castellated, reduced height, reduced across flats, in heat resisting steel, passivated Classification : 600 MPa (at ambient
3、 temperature)/650 OC Srie arospatiale crous hexagonaux crneaux, hauteur rduite, surplats rduits, en acier rsistant chaud, passivs Classification : 600 MPa ( temprature ambiante)/650 OC Luft- und Raumfahrt Flache Kronenmuttern, reduzierte Schlsselweite, aus hochwarmfestem Stahl, passiviert Klasse : 6
4、00 MPa (bei Raumtemperatur)/650 OC This (Aerospace Series. pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts
5、of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examina
6、tion 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 final vote. 1992-01 -31 after the date of publication decision A.
7、E.C.M.A. Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cdex - FRANCE Mr. ARENA ) aecma 1992 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without licens
8、e from IHS-,-,-STD-AECMA PREN 3742-ENGL 1772 M 10L2311 001302b 101 Previous page is blank prEN 3742 Page 3 1 Scope This standard specifies the characteristics of hexagonal slotted/castellated nuts, reduced height, reduced across flats, in heat resisting steel, passivated, classification 600 MPa )/65
9、0 OC 2). 2 References IS0 5855-2, Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts IS0 8788, Aerospace - Fasteners - Tolerances of form and position for nuts IS0 91 39, Aerospace - Nuts, plain, slotted - Procurement specification 3) EN 2000, Aerospace series - Quality assurance
10、- EN aerospace products - Approval of quality system of manufacturers 4) EN 2367, Aerospace series - Split pins in steel EN 2753 EN 2424, Aerospace series - Identification marking of standard fasteners 4, EN 25 1 6, Aerospace series - Passivation of corrosion resistant steels 3) TR 3823, Aerospace s
11、eries - Materials for plain and slotted hexagonal nuts 5, 3 Required characteristics 3.1 See figure 1 and table 1. 3.2 Materials TR 3823 3.3 Surface treatment EN 251 6, process class appropriate to the material Configuration - Dimensions - Masses 1) Corresponds to strength class of the associated bo
12、lt, the 100 per cent load of which it is able to withstand, when tested at ambient temperature, without breaking or cracking. 2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maxim
13、um temperature is conditioned by the material. 3) In preparation at the date of publication of the present standard 4) Published as AECMA standard at the date of publication of the present standard 5) Published as AECMA technical report at the date of publication of the present standard Copyright As
14、sociation Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3742 Page 4 STD-AECMA PREN 37V2-ENGL 1772 LOLZ3LL O033027 UV8 69 PQ Break sharp edges 0,l mm to 0,4 mm S 4 - R
15、 max= t 03 S $- min R min= 5 min IO Detait Y : Form (radius or chamfer) at bottom of clot at manufacturers opt i on Form of contour within limiting dimensions at munufacturers see detail y Section X-X Figure 4, Table 1 5, Dimensions in millimetres 1 1 These values, in micrometres, apply before passi
16、vation. The values do not apply to threads the surface texture of which will be achieved by usual manufacturing methods. 2) This dimension also applies to upper chamfer. All forms of entry (chamfer or radius) optional within these limiting dimensions. 3) Diameter M may be tangential to, but not intr
17、ude on the flats. 4) Details of form not stated are at manufacturers option. 5) Tolerances of form and position shall be in conformity with IS0 8788. Dimensions and tolerances apply before passivation. 6) In conformity with IS0 5855-2 7) In conformity with EN 2367 8) Dimension G applies to height be
18、low slots and height of flats. 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-,-,-STD-AECMA PREN 3742-ENGL 1792 W 30112333 0033028 T4 W 100 to 160 180 to
19、240 prEN 3742 Page 5 C A 4 Example Example : Identity block I Description block Diameter code (see table 1) Number of this standard Note : If necessary, the originator code 19005 shall be placed between the description block and the identity block. 5 Marking See table 2. Table 2 I I Diameter code I Style to EN 2424 6 Technical specification IS0 9139, except for approval of manufacturers : EN 2000 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-,-,-
