1、STD*AECMA PREN 2BSi-ENGL 1775 W 1012311 OCIL2117 172 Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM C 3 Chairman Comments should be sent within six months after the date of publication to prEN 2894 Edition P 1 March 1995 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MAT
2、RIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 ICs : Descriptors : ENGLISH VERSION Aerospace series Nuts, bihexagonal, self-locking, with counterbore, in heat resisting nickel base alloy, passivated, Mos2 lubricated Classificati
3、on : I 550 MPa (at ambient temperature) i 315 OC Srie arospatiale Luft- und Raumfahrt avec chambrage, mit zylindrischer Aussenkung, passivs, lubrifis Mos2 passiviert, Mos2-geschmiert Ecrous bihexagonaux, freinage interne, en alliage rsistant chaud base de nickel, Zwlf kantmuttern, sel bstsicher nd,
4、aus hochwarmfester Nickelbasislegierung, Classification : 1 550 MPa Klasse : 1 550 MPa ( temprature ambiante) / 315 OC (bei Raumtemperatur I 315 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial).
5、 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 shall not be changed to an extent t
6、hat interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPSI and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standa
7、rd to CEN (European Committee for Standardization) for formal vote. 1995-03-31 AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE M. Arena aecma 1995 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with
8、 AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN 287Li-ENGL 1775 E LUL231L OOL2LLB O27 Page 3 prEN 2894 : 1995 1 Scope This standard specifies the characteristics of self-locking bihexagonal nuts, with counterbore, in heat resisting nickel base
9、alloy, passivated, Mos2 lubricated. Classification : 1 550 MPa ) / 31 5 OC 2, 2 Nor mative ref er en ces IS0 4095 IS0 5855-2 IS0 5858 IS0 8788 EN 2000 EN 2424 EN 2491 EN 2516 EN 2952 EN 3042 Fasteners for aerospace construction - Bi-hexagonal wrenching configuration Aerospace - MJ threads - Part 2 :
10、 Limit dimensions for bolts and nuts Aerospace - Self-locking nuts with maximum operating temperature less than or equal to 425 OC - Procurement specification Aerospace - Fasteners - Tolerances of form and position for nuts Aerospace series - Quality assurance - EN aerospace products - Approval of t
11、he quality system of manufacturers Aerospace series - Marking of aerospace products Aerospace series - Molybdenum disulphide dry lubricants - Coating methods 3, Aerospace series - Passivation of corrosion resistant steels and decontamination of nickel base alloys 3, Aerospace series - Heat resisting
12、 alloy NI-PH2601 - Solution treated and cold worked - Bar for forged fasteners - D 5 50 mm - 1 270 MPa 5 R, I 1 470 MPa 4, Aerospace series - Quality assurance - EN aerospace products - Qualification procedure 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient
13、 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 temperature is conditioned by
14、 the surface treatment. 3) In preparation at the date of publication of this standard 4) Published as AECMA Prestandard at the date of publication of this standard Previous page is blank Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECM
15、ANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN 289Y-ENGL 1795 W LO12311 OOLZL19 Tb5 Page 4 prEN 2894 : 1995 3 Required characteristics 3.1 Configuration - Dimensions - Masses See figure 1 and table I. Dimensions and tolerances are expressed in mill
16、imetres and apply after passivation but before MOS, lubrication. Details of form not stated are at the manufacturers option. 3.2 IS0 8788 Tolerances of form and position 3.3 Material EN 2952 3.4 Surface treatments EN 251 6, process class appropriate to the material EN 2491, thickness not specified C
17、opyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 5 prEN 2894 : 1995 Diameter code Remove sharp edges 0,l to 0,4 Thread F G H J KMN P Mass 2, max. ma
18、x. min. min. min. min. min. x-x 050 060 , - 28“to50“ I- MJxO, 8-4H6H 7 9,l 9,4 5,5 8,3 2 2,4 2,52 MJ6xl-4H5H 8 10,6 10,8 6,5 9,8 2,3 4,29 Form out-of-round in this area to achieve the self-locking torque requirement 070 080 4 I- l I, MJ7xl-4H5H MJ8xl-4H5H 10 13.6 13.1 8,5 12,8 2.8 8.77 9 12,l 11,8 7
19、,5 11,3 1,2 pl 2,7 /I 1) These values in micrometres apply before surface treatment. They do not apply to threads the surface texture of which will be as achieved by usual manufacturing methods. 2) Also applies to lower chamfer. All forms of entry (chamfer or radius) optional within these limiting d
20、imensions. 3) Bihexagonal configuration in accordance with IS0 4095 over length N. 4) Wrench pad engagement 5) Tooling marks are permitted in this area. Figure 1 Table 1 I I I .I -1 -1. I I 1 O0 I MJlOxI,25-4H5H I 12 I16,8 I16 I10,5 I15,8 I 1381 I .in I 13,16 I I I L.3 - Copyright Association Europe
21、ene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 6 prEN 2894 : 1995 4 Designation EXAMPLE : Description block Identity block EN2894-060 Number of this standard Diameter code (
22、see table 1 ) NOTE : If necessary, the code I9005 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. 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-,-,-
