1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2894 Edition P 2 October 2013 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONRue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 1 of March
2、1995 Descriptors: ENGLISH VERSION Aerospace series Nuts, bihexagonal, self-locking, with counterbore, in heat resisting nickel base alloy, passivated, MoS2lubricated Classification: 1 550 MPa (at ambient temperature) / 315 C Srie arospatiale crous bihexagonaux, freinage interne, avec chambrage, en a
3、lliage rsistant chaud base de nickel, passivs, lubrifis MoS2 Classification : 1 550 MPa ( temprature ambiante) / 315 C Luft- und Raumfahrt Zwlfkantmuttern selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfester Nickelbasislegierung, passiviert, MoS2-geschmiert Klasse: 1 550 MPa (bei Raumtem
4、peratur) / 315 C This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the expert
5、s of the concerned Domain following member comments. 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 and review by
6、users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the E
7、N the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 31 October 2013 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2013 by ASD-STAN prEN 2894:2013 (E)
8、2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Required characteristics .4 4 Designation 6 5 Marking .6 6 Technical specification .6 Annex A (informative) Standard evolution form .7 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domai
9、n. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 2894:2013 (E) 3 1 Scope This standard specifies the characteristics of self-locking bihexagonal nuts, with counterb
10、ore, in heat resisting nickel base alloy, passivated, MoS2lubricated. Classification: 1 550 MPa 1)/ 315 C 2). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references
11、, the latest edition of the referenced document (including any amendments) applies. EN 2424, Aerospace series Marking of aerospace products EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods EN 2516, Aerospace series Passivation of corrosion resisting steels and decontami
12、nation of nickel base alloys EN 2952, Aerospace series Heat resisting alloy NI-PH2601 Solution treated and cold worked Bar for forged fasteners D 50 mm 1 270 MPa Rm 1 550 MPa 3)EN 9100, Quality Management Systems Requirements for Aviation, Space and Defence Organizations EN 9133, Aerospace series Qu
13、ality management systems Qualification procedure for aerospace standard parts ISO 4095, Aerospace Bihexagonal drives Wrenching configuration Metric series 4)ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts 4)ISO 5858, Aerospace Nuts, self-locking, with maximum operating t
14、emperature less than or equal to 425 C Procurement specification 4)ISO 8788, Aerospace Nuts, metric Tolerances of form and position 4)1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a highe
15、r 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 the surface treatment. 3) Published as ASD-STAN Prestandard at the date of
16、publication of this standard. http:/www.asd-stan.org/ 4) Published by: ISO International International Standardisation Organisation http:/www.iso.ch/. prEN 2894:2013 (E) 4 3 Required characteristics 3.1 Configuration Dimensions Mass See Figure 1 and Table 1. Dimensions and tolerances are expressed i
17、n millimetres and apply after passivation but before MoS2lubrication. Details of form not stated are at the manufacturers option. 3.2 Tolerances of form and position See ISO 8788. 3.3 Material See EN 2952. prEN 2894:2013 (E) 5 3.4 Surface treatments EN 2516, process class appropriate to the material
18、. EN 2491, thickness not specified. These values in micrometres apply before surface treatment. They do not apply tothreads the surface texture of which will be as achieved by usual manufacturingmethods. Remove sharp edges 0,1 to 0,4. Key 1 28 to 50 2 Thread 3 90 to 120 4 Form out-of-round in this a
19、rea to achieve the self-locking torque requirement. 5 Marking aAlso applies to lower chamfer. All forms of entry (chamfer or radius) optional within these limiting dimensions. bTooling marks are permitted in this area. cWrench pad engagement. dBihexagonal configuration in accordance with ISO 4095 ov
20、er length N. Figure 1 6,3 1,6 prEN 2894:2013 (E) 6 Table 1 Diameter code Thread aF G H J K M N P Mass bmax. max. min. min. min. min. min. 050 MJ50,8-4H6H 7 9,1 9,4 5,5 8,3 1,2 2 2,4 2,52 060 MJ61-4H5H 8 10,6 10,8 6,5 9,8 2,3 2,7 4,29 070 MJ71-4H5H 9 12,1 11,8 7,5 11,3 2,6 5,91 080 MJ81-4H5H 10 13,6
21、13,1 8,5 12,8 2,8 8,77 100 MJ101,25-4H5H 12 16,8 16 10,5 15,8 3,1 2,9 13,16 120 MJ121,25-4H5H 14 19,9 18 12,5 18,8 1,4 3,5 22,98 140 MJ141,5-4H5H 17 23 20,7 14,5 21,9 1,7 4 3,2 30,28 160 MJ161,5-4H5H 19 26 23,2 16,5 24,9 1,9 4,7 42,82 180 MJ181,5-4H5H 22 29,1 25,7 18,5 28 2,1 5,6 59,52 200 MJ201,5-4
22、H5H 24 32,3 28,2 20,5 31,2 2,3 6,8 77,28 220 MJ221,5-4H5H 27 35,4 30,7 22,5 34,3 2,5 8,3 110,73 240 MJ242-4H5H 30 38 33,7 24,5 36,9 2,7 10,1 3,7 130,55 aIn accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. bApproximate values (kg/1 000 pieces), c
23、alculated on the basis of 8,195 kg/dm3, given for information purposes only. 4 Designation EXAMPLE Description block NUT Identity block EN2894-060 Number of this standard Diameter code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity bloc
24、k. 5 Marking EN 2424, style N. See Figure 1. 6 Technical specification ISO 5858, except for: Approval of manufacturers: see EN 9100; Qualification of products: see EN 9133. prEN 2894:2013 (E) 7 Annex A (informative) Standard evolution form MODIFICATION REASON AND VALIDATION M cotation is not well defined. We propose a standard cotation.
