EN 3752-2004 en Aerospace series - Nuts self-locking MJ threads in heat resisting steel FE-PA2601 (A286) MoS2 coated - Classification 1 100 MPa (at ambient temperature) 425 degree.pdf

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1、BRITISH STANDARD AEROSPACE SERIES BS EN 3752:2004 Nuts, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS 2 coated Classification: 1 100 MPa (at ambient temperature) / 425 C Technical specification The European Standard EN 3752:2004 has the status of a British Standard ICS 49.0

2、30.30 BS EN 3752:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 5 January 2005 BSI 5 January 2005 ISBN 0 580 45184 4 National foreword This British Standard is the official English language version of EN 3752:2004. It supersedes BS EN 3

3、752:2003 which is withdrawn.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 secretary. Cross-refer

4、ences 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 Catalogue or of British

5、 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 the text; present t

6、o 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 front cover, an insid

7、e 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 EUROPISCHE NORM EN 375

8、2 November 2004 ICS 49.030.30 Supersedes EN 3752:2003 English version Aerospace series - Nuts, self- locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS 2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 C - Technical specification Srie arospatiale - crous, freinage i

9、nterne, filetage MJ, en acier rsistant chaud FE-PA2601 ( A286 ) , revtus MoS2 - Classification : 1 100 MPa ( temprature ambiante ) / 425 C - Spcification technique Luft- und Raumfahrt - Muttern, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2- beschichtet - Klasse: 1 100

10、MPa ( bei Raumtem p eratur ) / 425 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 Europe an Standard the status of a national st

11、andard without any alteration. Up-to-date lists and bibliographical references concerning s uch 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 othe

12、r language made by tra nslation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the off icial versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland,

13、France, G ermany, Greece, 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 NO

14、RMUNG 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 3752:2004: E EN 3752:2004 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4

15、 4 Quality assurance6 5 Requirements.7 EN 3752:2004 (E) 3 Foreword This document (EN 3752:2004) 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 Association, this Standa

16、rd 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 endorsement, at the latest

17、 by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 3752:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Aust

18、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. EN 3752:2004 (E) 4 1 Scope This

19、standard specifies the characteristics; qualification and acceptance requirements for self-locking nuts with MJ threads in FE-PA2601, MoS 2coated, for aerospace applications. Classification: 1 100 MPa 1)/ 425 C 2)It is applicable whenever referenced. 2 Normative references The following referenced d

20、ocuments are indispensable for the application of this document. For dated references, only the edition cited 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: Sampli

21、ng schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 3452, Non-destructive testing Penetrant inspection General principles ISO 4288, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture ISO 5

22、855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 7481, Aerospace Nuts, self-locking, with maximum operating temperature less than or equal to 425 C Test methods EN 2491, Aerospace series Molybdenum disulphide dry lubricants Coating methods EN 9133, Aerospace series Quality

23、 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 quantity of finished nuts, of the same

24、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 1) Correspond to the minimum tensile stres

25、s 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 3) Published as AECMA Prestandard at the date of publication of this standard 4) Published by: American Society for Te

26、sting and Materials (ASTM), 1916, Race Street, Philadelphia, PA 19103, USA EN 3752:2004 (E) 5 3.2 inspection lot quantity of nuts from a single production batch with the same part number which completely defines the nut 3.3 Surface discontinuities 3.3.1 crack rupture in the material which may extend

27、 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 rolling or forging them into the surface 3.3.4 inclusions non-metallic particles originating from t

28、he 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 items from a population of N items in such a way that all possible combinations of n items have th

29、e 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 depending upon the considered product, or that is likely to prevent performance of the function of

30、 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 defect a defect that is not likely to reduce materially the usability of the considered product fo

31、r 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 more samples are taken in order to obtain information and possibly to reach a decision 3.10 limitin

32、g quality (LQ 10 ) in a sampling plan, the quality limit which corresponds to a specified 10 % probability of acceptance EN 3752:2004 (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

33、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 for use, inclusive of any possible treatments and/or surface coatings, as specified in the prod

34、uct 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 movement of rotation in relation to the associated part, the assembly being under no axial load and

35、 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 introduce or to increase the axial load in the assembly 3.16 unseating torque the untightening torque

36、 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 the nut locking device still fully engaged on the bolt, but after the axial load in the assembl

37、y 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 Qualification EN 9133 Qualification inspections and tests (requirements, methods, numbers of nuts) ar

38、e 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 the qualification of a nut be granted without inspection or testing. Any such decision shall be

39、 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 inspections and tests. EN 3752:2004 (E) 7 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspecti

40、ons 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 Conditions Acceptance inspections and tests (requirement

41、s, 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 several inspections or tests. If a more stringent inspection

42、 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 qualification inspection and tests. 4.2.3 Responsibi

43、lity 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 Requirements See Table 1. EN 3752:2004 (E) 8 Table 1 Tec

44、hnical 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 analysis or certificate of conformity issued by the manufacturer of the semi-finished product A Q

45、46 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 shall be formed by a hot or cold forming process. If hot formed, the forming temperature shall not

46、 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 permitted by 5.5.4. Calibr

47、ation 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 examination 5.3.2 Heat treatment Solution treat at a temperature of 900 C to 980 C, hold at the selected t

48、emperature within 15 C for between 1 h min. and 2 h max., quench in oil, or alternative medium or faster. Precipitation treatment at (720 10) C, held at temperature for 16 h 15 min, cooled in air or faster. Examination of the heat treatment specification continued EN 3752:2004 (E) 9 Table 1 (continu

49、ed) Clause Characteristic Requirement Inspection and test method Q/A aSample size 5.3.3 Q 46 Bearing surface perpendicularity In accordance with the product standard or definition document For non-floating plate nuts having a bearing surface exceeding 1,5 the thread nominal diameter, the perpendicularity requirement shall, unless otherwise specified by the product standard or definition document, apply only