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:1550 MPa (at ambient temperature)/600 C Technical specification The European Standard EN 4047:2004 has the status of a British S
2、tandard ICS 49.030.30 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 45109 7 National foreword This British Standard is the official English language version of EN 4047:2004. I
3、t supersedes BS EN 4047:2003 which is withdrawn.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 responsibility to: A list of organizations represented on this committee can be obtained on request to its se
4、cretary. 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 “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Cat
5、alogue 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 with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand
6、 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 international and European developments and promulgate them in the UK. Summary of pages This document comprises a f
7、ront 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 last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EU
8、ROPISCHE NORM EN 4047 November 2004 ICS 49.030.30 Supersedes EN 4047:2003 English 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 specificati
9、on Srie arospatiale - crous, freinage interne, filetage MJ, en alliage rsistant chaud 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 N
10、ickelbasislegierung NI- PH2601 (Inconel 718), versilbert - Klasse: 1 550 MPa (bei Raumtemperatur) / 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 cond
11、itions 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 the Central Secretariat or to any CEN member. This European Standard exists in three
12、 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Aust
13、ria, 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. EUROPEAN COMMITTEE FOR STANDARDI
14、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: 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: EEN 4047:2004 (E) 2 Contents Page Foreword3
15、 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 Responsibility7 4.2.4 Inspection and test report.7 5 Requirements.7 EN 4047:2004 (E) 3 Foreword This document (EN 4047:2004) has been prepare
16、d by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After 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 A
17、ECMA, 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 endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document sup
18、ersedes EN 4047:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irel
19、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 4047:2004 (E) 4 1 Scope This standard specifies the characteristics; qualification and acceptance requirements for self-locking nuts with MJ
20、threads in NI-PH2601, silver plated, for aerospace applications. 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
21、applies. For undated references, the latest edition of the referenced 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 testi
22、ng Penetrant inspection General principles ISO 4288, Geometrical 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, A
23、erospace series Electrolytic silver plating of fasteners 3)EN 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,
24、 the following terms and definitions apply. 3.1 batch quantity 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
25、the relevant heat treatments and surface treatments 3.2 inspection 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 o
26、r cracking when tested with a bolt of a higher strength class. 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 EN
27、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 folding over metal fins or sharp corners and then rol
28、ling 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 specified 3.5 simple random sampling the taking of n it
29、ems 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 conditions for individuals using, maintaining, or de
30、pending 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 considered product for its intended purpose 3.8 minor de
31、fect 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 sampling plan a plan according to which one or mor
32、e samples are taken in order to obtain information and possibly to reach a decision 3.10 limiting quality (LQ 10 ) in a sampling plan, the quality limit which corresponds to a specified 10 % probability of acceptance EN 4047:2004 (E) 6 3.11 acceptance quality limit (AQL) a quality limit which in a s
33、ampling plan corresponds to a specified but relatively high probability of acceptance It is the maximum per 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. 3.12 finished nut a nut ready
34、 for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.13 definition 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 mov
35、ement of rotation in relation to the associated part, the assembly being under no axial load and the nut locking system being completely engaged with 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 intro
36、duce 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 remove 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
37、 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 followed 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 Quali
38、fication EN 9133 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 inspection lot by simple random sampling. The test programme may possibly be reduced, or
39、 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 diameters of nuts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of nut samples for the inspectio
40、ns and tests. EN 4047:2004 (E) 7 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 t
41、he requirements 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 production batch or inspection lot. Nuts from the batch or lot to be tested shall be selected by simple random sam
42、pling. Each nut may be submitted to several 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
43、and tests is the same as that submitted 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 provide
44、d if specified in the purchase order. 5 Requirements See Table 1. EN 4047:2004 (E) 8 Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A aSample size Q 5.1 Material In accordance with the product standard or definition document Chemical an
45、alysis 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 Standard gauging A Tables 3 and 4 5.3 Manufacturing Q 5.3.1 Forming Nuts sh
46、all 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 med
47、ium or atmosphere shall not cause any surface contamination except as permitted by 5.5.4. Calibration of the heat treatment equipment shall be confirmed. Any scale which will not be removed by subsequent machining shall be removed by abrasive blasting with an appropriate equipment. Visual examinatio
48、n 5.3.2 Heat treatment Solution treat (if applicable) at a temperature of 950 C to 980 C, hold 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 treatment at (720 5) C, held at temperature for 8 h 15 min, furnace
49、cooled at (55 5) C per hour to (620 5) C, held at 620 C for 8 h 5 min, followed by air cooling or faster. Instead of the 55 C per hour cooling rate to 620 C, parts may be furnace cooled at any rate provided the time at 620 C is adjusted to give a total precipitation time of 18 h min. Examination of the heat treatment specification continued EN 4047:2004 (E) 9 Table 1 (continued) Clause Characteristic Requirement Inspection a
