1、BRITISH STANDARD AEROSPACE SERIESBS EN 3709:2006Wrenches and sockets, bi-hexagonal Technical specificationThe European Standard EN 3709:2006 has the status of a British StandardICS 49.030.99g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g
2、51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3709:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2006 BSI 2006ISBN 0 580 48350 9National forewordThis British Standard is the offic
3、ial English language version of EN 3709:2006.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 secret
4、ary.Cross-referencesThe 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
5、 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 the te
6、xt; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, a
7、n inside front cover, the EN title page, pages 2 to 9 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3709April 2006ICS 49.030.9
8、9English VersionAerospace series - Wrenches and sockets, bi-hexagonal -Technical specificationSrie arospatiale - Cl et douille bihexagonale -Spcification techniqueLuft- und Raumfahrt - Ringschlssel undSteckschlsseleinstze, Doppelsechskant - TechnischeLieferbedingungenThis European Standard was appro
9、ved by CEN on 3 February 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalst
10、andards 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 translationunder the responsibility of a CEN member into its own language and notified to
11、 the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
12、ay, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and
13、 by any means reservedworldwide for CEN national Members.Ref. No. EN 3709:2006: E2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Terms and definitions.4 4 Requirements 4 5 Test methods.5 6 Qualification and acceptance requirements .8 7 Marking, labelling and packaging8 EN 3709:2006
14、3 Foreword This European Standard (EN 3709:2006) 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 Standard has received the approval of the National As
15、sociations 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 by October 2006, and conflicting national stan
16、dards shall be withdrawn at the latest by October 2006. 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 any or all such patent rights. According to the CEN/CENELEC I
17、nternal 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, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Ne
18、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3709:20064 1 Scope This standard specifies the requirements to be complied with by wrenches and double-hex sockets intended for aerospace products. 2 Normative references The follo
19、wing 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 (including any amendments) applies. ISO 1174 (all parts), Assembly tools for screws and nuts D
20、riving squares. ISO 4095, Aerospace Bihexagonal drives Wrenching configuration Metric series. EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts. 3 Terms and definitions For the purposes of this standard, the following terms and definitions appl
21、y. 3.1 lot a lot is composed of wrenches or sockets of the same type, originating from the same material defined by the same standard 4 Requirements 4.1 Materials The materials shall meet the required properties specified in the product standard. 4.2 Physical properties 4.2.1 Surface condition and a
22、ppearance The wrenches and sockets shall be free from pits, deposits, forging burrs, cracks, splits, flashes and other defects likely to modify their properties and endurance or to injure users. The wrench handle shall allow an easy handling and its shape shall permit a correct guiding of the box en
23、d. The wrenches and the outer surface of the sockets shall have a polished, brushed or satin-finished appearance with a uniform bright or dull finish. 4.2.2 Surface coating The surface treatment shall be as specified in the product standard. EN 3709:20065 4.2.3 Inner profile of teeth The tooth quali
24、ty shall allow an optimum efficiency of the bearing faces. The whole tooth (top, flank and bearing faces) shall be free from burrs and high metal. 4.3 Mechanical properties The integrity and endurance of various types of wrenches are tried by torsional tests whose conditions are defined in Clause 5.
25、 On completion of integrity and endurance tests, the wrenches and sockets shall not show the deteriorations and distortions defined below: The tooth shall not be rounded and shall comply with, the requirements specified in 4.2.3; The wrench or the socket shall be free from crack; The general surface
26、 condition shall comply with the requirements of 4.2.1; The distortion of the socket and wrench outer diameter shall not exceed 0,05 mm; The permanent distortion on the wrench handle shall not exceed 5; A Rockwell hardness test shall show values complying with the values specified in the product sta
27、ndard. 4.4 Dimensions and geometric tolerances Dimensions and tolerances shall be as specified in the product standard. 5 Test methods 5.1 Test equipment The wrenches are fitted on a hexagonal test mandrel 1)whose nominal dimensions shall be equal to the dimensions of the corresponding wrench; machi
28、ning tolerance h8, minimum hardness 55 HRC (See Figure 1). Dimensions and shapes to ISO 4095. 1) The mandrel is secured to a fixture or a calibrated torquemeter EN 3709:20066 H = nominal dim. 30cos1 15cos1H = 0,0597 hexagon nominal dim. Key 1 The wrench teeth shall not seat on this part of the mandr
29、el Figure 1 Test equipment 5.2 Test of wrenches The wrenches shall be fully engaged on the mandrel. During the test, they shall be handled smoothly and without shaking movements. The load is applied (as far as possible) on the wrench body normal to the centreline, continuously and progressively unti
30、l a torsional torque corresponding to the tested wrench is obtained. 5.3 Test of socket The insertion of the socket on the mandrel shall be equal to 0,55 IISM (where “S“ is the nominal dimension across flat of the mandrel or of bolt considered) and shall be performed without induced resistance. The
31、socket shall be manually extracted without the contribution of any external tooling. The socket is driven using a square mandrel with a minimum hardness of 55 HRC. The nominal dimension across flat of this mandrel shall be equal to the maximum dimension of the square drive corresponding to ISO 1174,
32、 tolerance h8. 5.4 Test performance The endurance torques specified in Table 1 and Table 2 shall be applied in both directions 1 000 times. Cadence 60 by minute maximum. An integrity torque of 1,5 times the endurance torque shall be applied every 250th time. In the case of wrenches each end shall be
33、 tested. EN 3709:20067 Table 1 Test torques for flat, offset and modified offset double-hex box wrenches Dimension across flat Integrity torque Nm Endurance torque Nm 6 30 207 4 278 51 34 9 75 5010 10 7011 132 88 12 165 110 14 248 155 17 440 235 19 630 315 22 800 400 Table 2 Test torque for socket w
34、renches CODE 063 100 125 Dimension across flat Endurance and integrity torques Nm Endurance and integrity torques Nm Endurance and integrity torques Nm 5 15 / 23 6 20 / 29 7 27 / 40 27 / 40 8 34 / 51 34 / 51 9 50 / 75 50 / 75 10 77 / 115 77 / 115 11 93 / 140 93 / 140 12 133 / 200 133 / 200 13 186 /
35、280 186 / 280 14 240 / 3615 300 / 450 16 360 / 5417 400 / 600 18 433 / 6519 453 / 680 20 453 / 6821 453 / 680 22 453 / 68EN 3709:20068 6 Qualification and acceptance requirements 6.1 Qualification 6.1.1 Purpose Purpose of qualification tests is to ensure that, the wrench and/or socket design and man
36、ufacturing conditions allow the wrenches or sockets to comply with the requirements of this standard. 6.1.2 Qualification procedure EN 9133: Requirement for ISO 9000:2000 not applicable. 6.1.3 Conditions Qualification inspection and tests specified in this document, shall be carried out on each type
37、 and size combination for wrenches and on each socket size and drive size according to Table 3 and Table 4. All or part of these tests may also be performed for production acceptance, when a reinforced inspection seems to be necessary. 6.2 Acceptance Acceptance tests shall be performed on wrenches o
38、r sockets randomly sampled from different manufacturing lots according to Table 5 and Table 6. 7 Marking, labelling and packaging 7.1 Marking The marking shall be as specified in the product standard. 7.2 Packaging All wrenches and sockets shall be packed by manufacturers option. Table 3 Summary of
39、test qualification and production acceptance Qualification Production acceptance Type of test Clause Sample size Clause Sample size Dimensions and geometrical tolerances 4-4 5 4-4 Table 5Mechanical properties 4-3 4 Surface condition and appearance 4-2-1 5 4-2-1 Table 5 Surface coating 4-2-2 2 Inner
40、profile of teeth 4-2-3 2 4-2-3 Table 5 Test methods 5 5 5 Table 6 Marking 7-1 5 EN 3709:20069 Table 4 Qualification testing for each dimensions samples Type of test Clause 1 2 3 4 5 Dimension and geometrical tolerances 4-4 X X X X X Mechanical properties 4-3 X X X X Surface condition and appearance
41、4-2-1 X X X X X Surface coating 4-2-2 X X Inner profile of teeth 4-2-3 X X Test methods 5 X X X X X Marking 7-1 XTable 5 Sampling plan for visual inspections and dimensional characteristics Acceptance number (Ac) and limiting quality (LQ) in accordance with the acceptable quality level (AQL) AQL 2,5
42、 % Batch size Sample size Ac LQ10% Up to 20 3 21 to 50 5 0 90 51 to 90 8 0 90 91 to 150 10 1 90 Above 151 12 2 80 Table 6 Sampling plans for the inspection of torque tests Sample size Destructive test Batch size Wrench Socket Up to 20 0 0 21 to 40 0 0 41 to 81 1 1 81 to 120 1 1 Above 121 2 2 NOTE Th
43、e wrench or socket to be subjected to destructive tests may be those on which non destructive tests have been performed. EN 3709:2006BS EN 3709:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards.
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