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1、BRITISH STANDARD AEROSPACE SERIES BS EN 4047:2004 Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated Classification:1550MPa (at ambient temperature)/600 C Technical specification The European Standard EN 4047:2004 has the status of a British St
2、andard ICS 49.030.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 4047:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 December 2004 BSI 20 December 2004 ISBN 0 580
3、 45109 7 National foreword This British Standard is the official English language version of EN 4047:2004. It supersedes BS EN 4047:2003 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the r
4、esponsibility to: A list of organizations represented on this committee 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 Catalogue under the section entitled
5、 “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 correct application. Compliance wi
6、th 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 interests informed; monitor related interna
7、tional 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 notice displayed in this document indicates when the document was
8、last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4047 November 2004 ICS 49.030.30 Supersedes EN 4047:2003 English vers
9、ion 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 Srie arospatiale - crous, freinage interne, filetage MJ, en alliage rsistant chaud
10、base de nickel NI- PH2601 (Inconel 718), argents - Classification : 1 550 MPa ( temprature ambiante) / 600 C - Spcification technique Luft- und Raumfahrt - Muttern, selbstsichernd, MJ- Gewinde, aus hochwarmfester Nickelbasislegierung NI- PH2601 (Inconel 718), versilbert - Klasse: 1 550 MPa (bei Raum
11、temperatur) / 600 C - Technische Lieferbedingungen This European Standard was approved by CEN on 11 September 2003. CEN members are 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
12、 alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by
13、translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gree
14、ce, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre
15、: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4047:2004: E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 2 C
16、ontents Page Foreword3 1 Scope4 2 Normative references4 3 Terms and definitions .4 4 Quality assurance6 4.1 Qualification.6 4.2 Acceptance.7 4.2.1 Purpose.7 4.2.2 Conditions7 4.2.3 Responsibility 7 4.2.4 Inspection and test report.7 5 Requirements.7 Licensed Copy: sheffieldun sheffieldun, na, Sat No
17、v 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 3 Foreword This document (EN 4047:2004) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Associ
18、ation, 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 a national standard, either by publication of an identical text or by endorsem
19、ent, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 4047:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europ
20、ean Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy:
21、 sheffieldun sheffieldun, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 4 1 Scope This standard specifies the characteristics; qualification and acceptance requirements for self-locking nuts with MJ threads in NI-PH2601, silver plated, for aerospace applications
22、. Classification: 1 550 MPa 1) / 600 C 2) It is applicable whenever referenced. 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, the latest edition of the re
23、ferenced document (including any amendments) applies. ISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptable quality limit (AQL) for lot-by-lot inspection ISO 3452, Non destructive testing Penetrant inspection General principles ISO 4288, Geometri
24、cal Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture ISO 8642, Aerospace Self locking nuts with maximum operating temperature greater than 425 C Test methods EN 2786, Aerospace series Electrolytic silver plating of fasteners 3) E
25、N 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts 3) ASTM E 112-96, Standard Test Methods for Determining Average Grain Size 4) 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 batch quant
26、ity of finished parts, of the same type and same diameter, produced from the same material obtained from the same 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 ins
27、pection lot quantity of parts from a single production batch with the same part number which completely defines the part 1) Correspond 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 higher strength cla
28、ss. 2) Maximum test temperature of the parts 3) Published as AECMA Prestandard at the date of publication of this standard 4) Published by: American Society for Testing and Materials (ASTM), 1916, Race Street, Philadelphia, PA 19103, USA Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:1
29、5 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 5 3.3 Surface discontinuities 3.3.1 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.3.2 seam open surface defect 3.3.3 lap surface defect caused by foldi
30、ng over metal fins or sharp corners and then rolling or forging them into the surface 3.3.4 inclusions non-metallic particles originating from the material manufacturing process. These particles may be isolated or arranged in strings. 3.4 test temperature ambient temperature unless otherwise specifi
31、ed 3.5 simple random sampling the 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 3.6 critical defect a defect that, according to judgement and experience, is likely to result in hazardous or unsafe cond
32、itions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item 3.7 major defect a defect other than critical, that is likely to result in a failure or to reduce materially the usability of the consider
33、ed product for its intended purpose 3.8 minor defect a defect that is not likely to reduce materially the usability of the considered 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 3.9 sa
34、mpling plan a plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 3.10 limiting quality (LQ10) in a sampling plan, the quality limit which corresponds to a specified 10 % probability of acceptance Licensed Copy: sheffieldun sheffieldu
35、n, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 6 3.11 acceptance quality limit (AQL) a quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance It is the maximum per cent defective (or the maximum number o
36、f defects per hundred units) that, for purposes of sampling inspection can be considered satisfactory as a process average. 3.12 finished nut a nut ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.13 definition
37、 document document specifying all the requirements for finished nuts 3.14 self-locking torque the torque to be applied to the nut or bolt to maintain movement of rotation in relation to the associated part, the assembly being under no axial load and the nut locking system being completely engaged wi
38、th the bolt (minimum protrusion of two pitches including end chamfer) 3.15 seating torque the tightening torque to be applied to the nut or bolt to introduce or to increase the axial load in the assembly 3.16 unseating torque the untightening torque to be applied to the nut or bolt to reduce or remo
39、ve the axial load in the assembly 3.17 breakaway torque the torque required to start unscrewing the nut or bolt with respect to the associated part, with the nut locking device still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewing half a turn follow
40、ed by a halt in rotational movement 3.18 wrench feature torque the torque to be applied to the wrenching feature of the nut 4 Quality assurance 4.1 Qualification EN 9133 Qualification inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1. They shall be carried out o
41、n: each type and diameter of nut; 46 nuts selected from a single inspection lot by simple random sampling. The test programme may possibly be reduced, or the qualification of a nut be granted without inspection or testing. Any such decision shall be based on the results obtained on similar types and
42、 diameters of nuts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of nut samples for the inspections and tests. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 7 4.2 Acc
43、eptance 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 requirements of this standard. 4.2.2
44、Conditions Acceptance inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1 ; they shall be carried out on each production batch or inspection lot. Nuts from the batch or lot to be tested shall be selected by simple random sampling. Each nut may be submitted to seve
45、ral inspections 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
46、for qualification 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
47、Requirements See Table 1. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 08:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 4047:2004 (E) 8 Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size Q 5.1 Material In acc
48、ordance with the product standard or definition document Chemical analysis or certificate of conformity issued by the manufacturer of the semi-finished product A Q 43 5.2 Dimensions, tolerances and tolerances of form and position In accordance with the product standard or definition document Standar
49、d gauging A Tables 3 and 4 5.3 Manufacturing Q 5.3.1 Forming Nuts shall be formed by a hot or cold forming process. If hot formed, the forming temperature shall not exceed 1 150 C and they shall be air cooled or faster. The equipment shall ensure a uniform temperature throughout the production batch. The method of forming shall be indicated. Q The heat treatment medium or atmosphere shall not cause any surface contamination except as permi