1、BRITISH STANDARDBS EN 3299:2007Aerospace series Shaft-nuts and threaded rings, self-locking, right- or left-hand MJ threads, in heat resisting steel FE-PA2601 (A286), silver plated Technical specificationThe European Standard EN 3299:2007 has the status of a British StandardICS 49.030.30; 49.030.50g
2、49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3299:2007This British Standard was published under the authority of the Standards Policy and St
3、rategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 57069 8National forewordThis British Standard is the UK implementation of EN 3299:2007.The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems.A list of organizations repr
4、esented on this committee can be obtained on request to its secretary.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 cannot confer immunity from legal obligations.Amendments
5、 issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3299July 2007ICS 49.030.30; 49.030.50English VersionAerospace series - Shaft-nuts and threaded rings, self-locking,right- or left-hand MJ threads, in heat resisting steel FE-PA2601(A286), silver plated -
6、 Technical specificationSrie arospatiale - crous darbres et bagues filetes, freinage interne, filetage MJ droite ou gauche, en acierrsistant chaud FE-PA2601 (A286), argents -Spcification techniqueLuft- und Raumfahrt - Wellenmuttern und Gewinderinge,selbstsichernd, Rechts- oder Links-MJ-Gewinde, aush
7、ochwarmfestem Stahl FE-PA2601 (A286), versilbert -Technische LieferbedingungenThis European Standard was approved by CEN on 28 August 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a nationa
8、l standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any o
9、ther language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia,
10、 Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES K
11、OMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3299:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Qualit
12、y assurance6 4.1 Qualification .6 4.2 Acceptance.6 4.2.1 Purpose.6 4.2.2 Conditions 6 4.2.3 Responsibility 7 4.2.4 Inspection and test report.7 5 Requirements.7 Annex A (normative) Checking bearing surface perpendicularity .13 A.1 Inspection device.13 A.2 Procedure .13 A.3 Results to be obtained 13
13、Annex B (normative) Method of checking locking torque.16 B.1 Inspection device.16 B.2 Procedure .16 B.3 Results to be obtained 16 Annex C (normative) Hardness test.18 C.1 Choice of method.18 C.2 Procedure .18 EN 3299:20073 Foreword This document (EN 3299:2007) has been prepared by the Aerospace and
14、Defence Industries Association of Europe - Standardization (ASD-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 ASD, prior to its p
15、resentation 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 January 2008, and conflicting national standards shall be withdrawn at the latest by January 2008. Attention is drawn to the pos
16、sibility 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 any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries
17、are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sw
18、eden, Switzerland and the United Kingdom. EN 3299:20074 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for self-locking shaft-nuts and threaded rings, with right- or left-hand MJ threads, in FE-PA2601, silver-plated, for aerospace applications. Tempera
19、ture class: 450 C 1)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 referenced document (inc
20、luding any amendments) applies. ISO 3452, Non-destructive testing Penetrant inspection General principles. ISO 3534:1977, Statistics Vocabulary and symbols. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. EN ISO 4288, Geometrical Product Specifications (GPS) Surface tex
21、ture: Profile method Rules and procedures for the assessment of surface texture (ISO 4288:1996). EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method (ISO 6507-1:2005). EN ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H,
22、 K, N, T) (ISO 6508-1:2005). EN 2786, Aerospace series Electrolytic silver plating of fasteners. 2)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts. ASTM E 112-88, Standard Test Methods for Determining Average Grain Size. 3)3 Terms and definit
23、ions For the purposes of this standard, the following terms and definitions apply. 3.1 finished nut or ring a nut or ring ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 1) Maximum test temperature of the parts.
24、 2) Published as ASD Prestandard at the date of publication of this standard. 3) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, USA. EN 3299:20075 3.2 definition document document specifying all the requirements
25、for finished nuts or rings 3.3 batch quantity of finished nuts or rings, 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 relev
26、ant heat treatments and surface treatments 3.4 production cycle period during which production proceeds without any voluntary or unforeseen change in manufacturing parameters 3.5 heat treatment cycle period during which the oven continuously remains at nominal treatment temperature 3.6 surface treat
27、ment cycle period during which the surface treatment proceeds without any voluntary or unforeseen change in surface treatment parameters 3.7 Surface discontinuities 3.7.1 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in characte
28、r 3.7.2 seam open surface defect 3.7.3 lap surface defect caused by folding over metal fins or sharp corners 3.7.4 inclusions non-metallic particles originating from the material manufacturing process These particles may be isolated or arranged in strings. 3.8 sampling plan a plan according to which
29、 one or more samples are taken in order to obtain information and possibly reach a decision ISO 3534, see definition 3.9 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 ISO 353
30、4, see definition EN 3299:20076 3.10 self-locking torque the torque to be applied to the nut or ring to maintain its movement of rotation in relation to the associated part, the assembly being under no axial load and the locking zone being completely engaged on the associated part (minimum protrusio
31、n of two pitches, including the end chamfer) 3.11 breakaway torque the torque required to start unscrewing the nut or ring with respect to the associated part, with the locking zone still fully engaged, but after the axial load in the assembly has been removed by unscrewing half a turn followed by a
32、 halt in rotational movement 3.12 effective seating torque part of the apparent seating torque which introduces or increases the axial load in the assembly. The effective seating torque is equal to the difference between the apparent seating torque and the self-locking torque. 3.13 apparent seating
33、torque the torque indicated by the dynamometric wrench when tightening 4 Quality assurance 4.1 Qualification EN 9133. Qualification inspections and tests (requirements, methods, numbers of nuts or rings) are specified in Table 1. They shall be carried out on: each type and diameter of nut or ring; 1
34、2 nuts or rings selected from a single batch by simple random sampling. The test programme may possibly be reduced or the qualification be granted without inspection or testing: any such decision shall be based on the results obtained on similar diameters of nuts or rings, provided that the design a
35、nd manufacturing conditions are identical. Table 2 indicates the allocation of nut or ring samples for the inspections 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
36、 the uncertainty inherent to statistical sampling, that the nuts or rings constituting the batch satisfy the requirements of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of nuts or rings) are specified in Table 1. They shall be carried out on each
37、batch. Nuts or rings from the batch to be tested shall be selected by simple random sampling. Each nut or ring may be submitted to several inspections or tests. EN 3299:20077 If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed d
38、uring the acceptance inspection and testing. In this case, the sample submitted to these inspections 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 responsibi
39、lity. 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. Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A aSamplesize 5.1 Mate
40、rial Q In accordance with the product standard or definition document Chemical analysis or certificate of compliance issued by the manufacturer of the semi-finished product A 5.2 Q 9 Dimensions, tolerances of form and position In accordance with the product standard or definition document Standard g
41、auging A Table 3 5.3 Manufacturing Q The nuts or rings shall be manufactured by machining. Examination of the manufacturing process 5.3.1 Q Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination except as permitted by 5.5.4. Examination of the heat treatment
42、 equipment Q Solution treat (if applicable) at a temperature of 900 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 10) C held at temperature for 16 h 15 min cooled in air or faster
43、process. Examination of the heat treatment process Any scale not removed by subsequent machining shall be removed by abrasive blasting. Visual examination 5.3.2 See Annex A. Q 3 Bearing surface perpendicularity In accordance with the product standard or definition document. A Table continued EN 3299
44、:20078 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A aSamplesize 5.3.3 Q 9Threads and thread deformation Threads in the locking region may be deformed in any manner provided that the nut or ring meets the requirements of this standard. The method of forming sha
45、ll be indicated. A Table 3 Any tool marks shall blend smoothly without any abrupt changes. Visual examination The finished nuts or rings shall allow the “GO“ thread plug or ring gauge to enter a minimum of 1,5 turns before engagement of the locking element. Standard gauging 5.3.4 EN ISO 4288 Q 3 Sur
46、face roughness In accordance with the product standard or definition document Visual examination A Table 3 5.3.5 Surface coating In accordance with the product standard or definition document EN 2786 5.3.5.1 Appearance See 5.3.5. See 5.3.5. Q 9 A Table 3 5.3.5.2 Thickness See 5.3.5. Q 3 See 5.3.5. I
47、nspection can be carried out at the same time as inspection per 5.5.1. A Table 3 5.3.5.3 Adhesion See 5.3.5. Q 3 See 5.3.5. Inspection can be carried out at the same time as inspection per 5.4.1.3. A Table 3 5.4 Mechanical properties 5.4.1 Reusability test After testing, nut or ring threads shall no
48、t show any indications of distortion, galling or seizing as to prevent reassembly of the nut or ring freely, up to the self-locking zone. Threads of the inspection device shall remain serviceable and permit assembly of a new nut freely with the fingers up to the self-locking zone. The self-locking t
49、orque and the seating and unseating torque shall be measured for each cycle upon tightening and un-tightening. See Annex B. Q 3 5.4.1.1 Self-locking torque at ambient temperature (12 cycles) They shall be within the min./max. values given in Table B.1, columns 2 and 3 or 4, for each cycle. continued EN 3299:20079 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A aSamplesize 5.4.1.2 See Annex B. A Table 3 Self-locking torque at ambient temperature (one cycle) They shall
