1、BS EN 4621:2010ICS 49.030.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Inserts, MJthreads, self-locking,self-broachingkeys TechnicalspecificationsThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommi
2、ttee on 30 April2010 BSI 2010ISBN 978 0 580 69133 1Amendments/corrigenda issued since publicationDate CommentsBS EN 4621:2010National forewordThis British Standard is the UK implementation of EN 4621:2010.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace f
3、asteners and fastening systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard
4、 cannot confer immunityfrom legal obligations.BS EN 4621:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4621 March 2010 ICS 49.030.30 English Version Aerospace series - Inserts, MJ threads, self-locking, self-broaching keys - Technical specification Srie arospatiale - Douilles filetes, fil
5、etages MJ, freinage interne clavettes auto-brochantes - Spcification technique Luft- und Raumfahrt - Gewindeeinstze, MJ-Gewinden, selbstsicherndmit selbstrumenden Stiften - Technische Lieferbedingungen This European Standard was approved by CEN on 9 January 2010. CEN members are bound to comply with
6、 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 the CEN Management Cen
7、tre 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 CEN Management Centre has the same status as the offici
8、al versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slova
9、kia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide
10、for CEN national Members. Ref. No. EN 4621:2010: EBS EN 4621:2010EN 4621:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions . 44 Quality assurance 74.1 Qualification . 74.2 Acceptance . 74.2.1 Purpose . 74.2.2 Conditions 74.2.3 Responsibility 74.2.4 Inspectio
11、n and test report . 75 Requirements . 7Annex A (normative) Definition of test block .18Annex B (normative) Assembly for rotational resistance test .19Annex C (normative) Axial tensile strength test 21Annex D (normative) Assembly for reusability test .23Annex E (normative) “GO“ gauge for inspection o
12、f the position of the keys .25BS EN 4621:2010EN 4621:2010 (E) 3 Foreword This document (EN 4621:2010) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association,
13、this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, 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 t
14、he latest by September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying a
15、ny or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gre
16、ece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 4621:2010EN 4621:2010 (E) 4 1 Scope This standard specifies the characteristics, qualification and
17、 acceptance requirements for self-locking inserts, self-broaching keys with MJ threads, for aerospace applications. 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 e
18、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2638, Aerospace series Aluminium alloy 2024-T3 Extruded bar and section 1,2 mm (a or D) 150 mm With coarse peripheral grain control 1)EN 4619, Aerospace series Inserts,
19、MJ threads, self-locking, with self-broaching keys Installation and removal procedure EN 4620, Aerospace series Inserts, MJ threads, self-locking, with self-broaching keys Design standard EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts ISO 28
20、59-1:1999, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-Iot inspection ISO 3452:1984, Non-destructive testing Penetrant inspection General principles ISO 4288, Geometrical Product Specifications (GPS) Surface texture:
21、Profile method Rules and procedures for the assessment of surface texture ISO 5855-1, Aerospace MJ threads Part 1: General requirements ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ASTM E 112-96, Standard Test Methods for Determining Average Grain Size 2)3 Terms and d
22、efinitions For the purposes of this document, 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
23、manufacturing route and having undergone all the relevant heat treatments and surface treatments 1) Published as ASD Prestandard at the date of publication of this standard. 2) Published by: American Society for Testing and Materials (ASTM), 1916, Race Street, Philadelphia, PA 19103, USA. BS EN 4621
24、:2010EN 4621:2010 (E) 5 3.2 Surface discontinuities 3.2.1 crack rupture in the material which may extend in any direction and which may be intercrystalline 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
25、then rolling or forging them into the surface 3.2.4 inclusions metallic or non-metallic particles originating from the manufacturing process NOTE These particles may be isolated or arranged in strings. 3.2.5 test temperature ambient temperature, unless otherwise specified 3.2.6 simple random samplin
26、g 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 3.2.7 critical defect defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, ma
27、intaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item 3.2.8 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 purp
28、ose 3.2.9 minor defect 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 3.2.10 sampling plan plan according to
29、 which one or more samples are taken in order to obtain information and possibly to reach a decision BS EN 4621:2010EN 4621:2010 (E) 6 3.2.11 limiting quality LQ10in a sampling plan, quality limit which corresponds to a specified 10 % probability of acceptance NOTE 1 It is the limiting lot quality c
30、haracteristic that the consumer is willing to accept with a low probability that a lot of this quality would occur. NOTE 2 For the purposes of this standard, the limiting quality quoted in Table 4 corresponds to a probability of acceptance of 10 %. 3.2.12 acceptance quality limit AQL quality limit w
31、hich in a sampling plan corresponds to a specified but relatively high probability of acceptance NOTE It is the maximum percent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average. 3.2.13 finish
32、ed insert insert ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the definition document 3.2.14 definition document document specifying all the requirements for finished inserts 3.2.15 self-locking torque ttorque to be applied to the associated bolt to ma
33、intain movement of rotation in relation to the part, the assembly being under no axial load and the insert locking zone being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.2.16 seating torque tightening torque to be applied to the insert or bolt to
34、 introduce or to increase the axial load in the assembly 3.2.17 unseating torque untightening torque to be applied to the insert or bolt to reduce or remove the axial load in the assembly 3.2.18 breakaway torque torque required to start unscrewing the insert or the bolt from the associated part, wit
35、h the insert 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 BS EN 4621:2010EN 4621:2010 (E) 7 4 Quality assurance 4.1 Qualification EN 9133. Qualification inspections and te
36、sts (requirements, methods, numbers of inserts with self-broaching keys) are specified in Table 1. They shall be carried out on: each type and diameter of inserts; 39 inserts selected from a single batch by simple random sampling. The test programme may possibly be reduced, or the qualification be g
37、ranted without inspection or testing. Any such decision shall be based on the results obtained on similar types and diameters of inserts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of insert samples for the inspections and tests. 4.2 Acceptan
38、ce 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 inserts constituting the batch satisfy the requirements of this standard. 4.2.2 Co
39、nditions Acceptance inspections and tests (requirements, methods, numbers of inserts) are specified in Table 1. They shall be carried out on each batch inserts from the batch to be tested shall be selected by simple random sampling. Each insert may be submitted to several inspections or tests. If a
40、more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspections and tests. In this case, the number of inserts submitted to these inspections and tests is the same as that submitted for qualification inspection
41、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 Requirements See Table 1. BS
42、EN 4621:2010EN 4621:2010 (E) 8 Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A aSample size 5.1 Material In accordance with the definition document Chemical analysis or certificate of conformity issued by the manufacturer of the semi-f
43、inished product Q 5.2 Dimensions, tolerances and tolerances of form and position In accordance with the definition document. A “GO“ inspection gauge is to be fitted on the insert keys. On completion of this inspection, the keys shall neither be bent nor moved. Standard gauging See Annex E. Q 39 A Ta
44、bles 3 and 4 5.3 Manufacturing 5.3.1 Process Insert threads may be produced by machining or forming. Manufacturing method shall be indicated on test report. 5.3.2 Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination. Calibration of the heat treatment equip
45、ment 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 The material shall be heat treated in accordance with the material specification defined in the definition document. Examinatio
46、n of the heat treatment specification 5.3.3 Thread deformation (form out-of round) Threads in the locking zone may be deformed in any manner provided that the insert meets the requirements of this standard. The finished inserts shall allow the “GO“ thread plug gauge to enter a minimum of three turns
47、, when gauged from the installation side before engagement in the locking zone. Standard gauging Q 39 A Tables 3 and 4 5.3.4 Surface roughness In accordance with the definition document ISO 4288 Q 3 A Tables 3 and 4 5.3.5 Surface coating In accordance with the definition document See applicable coat
48、ing standard. Q 36 A Tables 3 and 4 A Table 6 (continued) BS EN 4621:2010EN 4621:2010 (E) 9 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A aSample size 5.4 Mechanical properties 5.4.1 Installation requirement The screwing of insert shall be possible freely by ha
49、nd. After testing, the inserts shall show no signs of: buckling and/or incomplete fitting of the keys; deformation of the internal thread of the insert caused by keys installation. Inserts shall be installed into test block (see Annex A, normative) in accordance with EN 4619. Use a tool specified in accordance with EN 4619. Visual examination at a suitable magnification of 10 to 20 The recorded hardness of the test blocks must be indicated in the
