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1、BRITISH STANDARD AEROSPACE SERIES BS EN 4047:2003 Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) silver plated Classification: 1 550 MPa (at ambient temperature)/600 ? ?C Technical specification The European Standard EN 4047:2003 has the status of a Briti
2、sh Standard ICS 49.030.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 4047:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 5 March 2003 BSI 5 March 2003 ISBN 0 580 41
3、331 4 National foreword This British Standard is the official English language version of EN 4047:2003. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems
4、(international), which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI C
5、atalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
6、 correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interest
7、s informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright date displayed in this document
8、 indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4047 February 2003 ICS 49.030.30 Eng
9、lish version Aerospace series - Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1 550 MPa (at ambient temperature)/600 C - Technical specification This European Standard was approved by CEN on 1 November 2002. CEN members a
10、re bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to
11、 the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same statu
12、s as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and United Kingdom
13、. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4047:2003 E Licensed
14、Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2003 (E) 2 Contents Foreword3 1Scope 3 2Normative references 3 3Terms and definitions4 4Quality assurance6 4.1Qualification .6 4.2Acceptance.6 4.2.1Purpose.6 4.2.2Conditions 6 4.2.3Responsibilit
15、y.6 4.2.4Inspection and test report.6 5Requirements.6 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2003 (E) 3 Foreword This document EN 4047:2003 has been prepared by the European Association of Aerospace Manufacturers (AECMA). Af
16、ter enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of
17、 a national standard, either by publication of an identical text or by endorsement, at the latest by August 2003, and conflicting national standards shall be withdrawn at the latest by August 2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followi
18、ng countries are bound to implement this European Standard : Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. 1 Scope This standard
19、 specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in NI-PH2601, silver plated. Classification: 1 550 MPa 1) / 600 C 2). It is applicable whenever referenced. 2 Normative references This European Standard incorporates by dated or undated r
20、eference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when inco
21、rporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). ISO 2859-1Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-Iot inspection.
22、 ISO 3452Non-destructive testing - Penetrant inspection - General principles. ISO 3534Statistics -Vocabulary and symbols. ISO 4288Geometrical product specifications (GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture. 1)Corresponds to the minimum tens
23、ile 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 test temperature of the parts Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN
24、4047:2003 (E) 4 ISO 8642:1986Aerospace - Self-locking nuts with maximum operating temperature greater than 425 C - Test methods. EN 2786Aerospace series - Electrolytic silver plating of fasteners 3). EN 3042Aerospace series - Quality assurance - EN aerospace products - Qualification procedure. ASTM
25、E112-96Standard Test Methods for Determining Average Grain Size 4). 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 batch quantity of finished nuts, of the same type and same diameter, produced from a material obtained from the same
26、melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments 3.2 Surface discontinuities 3.2.1 crack rupture in the material which may extend in any direction and which may be interc
27、rystalline or transcrystalline in character 3.2.2 seam open surface defect 3.2.3 lap surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface 3.2.4 inclusions non-metallic particles originating from the material manufacturing process. These particl
28、es may be isolated or arranged in strings. 3.3 test temperature ambient temperature, unless otherwise specified 3.4 simple random sampling taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen 5) 3)Published a
29、s AECMA Prestandard at the date of publication of this standard 4)Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Dr, West Conshohocken, PA 19428- 2959- USA 5)Definition taken from ISO 3534 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 200
30、6, Uncontrolled Copy, (c) BSI EN 4047:2003 (E) 5 3.5 critical defect defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the
31、 function of a major end item 5) 3.6 major defect defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 5) 3.7 minor defect defect that is not likely to reduce materially the usability of the conside
32、red product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product 5) 3.8 sampling plan plan according to which one or more samples are taken in order to obtain information and possibly to reach a decisi
33、on 5) 3.9 limiting quality in a sampling plan, the quality level which corresponds to the specified 10% probability of acceptance 3.10 acceptable quality level (AQL) quality level which in a sampling plan corresponds to a specified but relatively high probability of acceptance. It is the maximum per
34、 cent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection can be considered satisfactory as a process average 5) 3.11 finished nut nut ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standar
35、d or definition document 3.12 definition document document specifying all the requirements for finished nuts 3.13 self-locking torque torque to be applied to the nut or bolt to maintain its movement of rotation in relation to the associated part, the assembly being under no axial load and the nut lo
36、cking zone being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.14 seating torque tightening torque to be applied to the nut or bolt to introduce or to increase the axial load in the assembly 3.15 unseating torque untightening torque to be applied t
37、o the nut or bolt to reduce or remove the axial load in the assembly Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2003 (E) 6 3.16 breakaway torque torque required to start unscrewing the nut or bolt with respect to the associated
38、part, with the nut locking zone still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewing half a turn followed by a halt in rotational movement 3.17 torque for testing the wrench feature torque to be applied to the wrenching feature of the nut 4 Quality
39、 assurance 4.1 Qualification EN 3042 Qualification inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1. They shall be carried out on: - each type and diameter of nut; - 46 nuts selected from a single batch by simple random sampling. The test programme may possibly
40、 be reduced, or the qualification be granted without inspection or testing : any such decision shall be based on the results obtained on similar types and diameters of nuts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of nut samples for the in
41、spections and tests. 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the nuts constituting the batch satisfy the requireme
42、nts of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1. They shall be carried out on each batch. Nuts from the batch to be tested shall be selected by simple random sampling. Each nut may be submitted to several inspe
43、ctions or tests. If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspection and testing. In this case, the number of nuts submitted to these inspections and tests is the same as that submitted for quali
44、fication inspection and tests. 4.2.3 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility 4.2.4 Inspection and test report A test report showing actual numerical values shall be provided if specified in the purchase order. 5 Requiremen
45、ts See Table 1. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2003 (E) 7 Table 1 Technical requirements and test methods ClauseCharacteristicRequirementInspection and test methodQ/A aSample size Q5.1MaterialIn accordance with the p
46、roduct standard or definition document Chemical analysis or certificate of compliance issued by the manufacturer of the semi- finished product A Q435.2Dimensions, tolerances and tolerances of form and position In accordance with the product standard or definition document Standard gauging . ATables
47、3 and 4 5.3Manufacturing Q5.3.1FormingNuts shall be formed by a hot or cold forming process. If hot formed, the forming temperature shall not exceed 1150 C and they shall be air cooled or faster. The equipment shall ensure a uniform temperature throughout the batch. The method of forming shall be in
48、dicated 5.3.2 continued Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination except as permitted by 5.5.4. Any scale which will not be removed by subsequent machining shall be removed by abrasive blasting with an appropriate equipment. Solution treat (if a
49、pplicable) at a temperature of 950 C to 980 C, held at the selected temperature within 15 C for between 1 h min. and 2 h max., quench in oil, or alternative medium or faster. Precipitation treat at (720 5) C holding at heat for 8 h 15 min furnace cooling at (55 5) C per h to (620 5) C holding at 620 C for 8 h 5 min followed by air cooling or faster. Instead of the 55 C per h cooling rate to 620 C, parts may be furnace cooled at any rate provided the time at 620 C is adjusted to g
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