BS-ISO-2936-1995.pdf

BRITISH STANDARD BS ISO 2936:1995 Implementation of ISO 2936:1995 Assembly tools for screws and nuts Hexagon socket screw keys ICS 25.140.30 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2936:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1996 © BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference MTE/15 Draft for comment 94/702758 DC ISBN 0 580 25258 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee MTE/15, Hand tools, upon which the following bodies were represented: British Coal Corporation British Telecommunications plc Consumer Policy Committee of BSI Federation of British Hand Tool Manufacturers Handle Manufacturers Association Institute of Carpenters Institute of Trading Standards Administration Ministry of Defence Co-opted members Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2936:1995 © BSI 09-1999i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO 29361 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2936:1995 ii © BSI 09-1999 National foreword This British Standard reproduces verbatim ISO 2936:1995 and implements it as the UK national standard. It supersedes BS 4168-9:1983 which is withdrawn. This British Standard is published under the direction of the Engineering Sector Board whose Technical Committee MTE/15 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2936:1995(E) ii © BSI 09-1999 Contents Page Forewordiii 1Scope1 2Normative references1 3Dimensions1 4Method of test1 5Designation1 6Marking1 Annex A (informative) Bibliography4 Figure 1 Hexagon socket screw key2 Table 1 Dimensions2 Table 2 Test values3 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2936:1995(E) © BSI 09-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 2936 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 10, Spanners and wrenches. This fourth edition cancels and replaces the third edition (ISO 2936:1983), which has been technically revised (clauses 4, 5 and 6). Annex A of this International Standard is for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2936:1995(E) © BSI 09-19991 1 Scope This International Standard specifies the dimensions, method of test, designation and marking of hexagon socket screw keys. It also specifies the minimum values of Rockwell hardness that shall be met. The specifications of this International Standard apply for tightening of screws for property class less than or equal to 12.9 as defined in ISO 898-1 and for tightening of socket set screws as defined in ISO 898-5. NOTE 1Hexagon socket screw keys are designated as number 112 in ISO 1703. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 898-1:1988, Mechanical properties of fasteners Part 1: Bolts, screws and studs. ISO 898-5:1980, Mechanical properties of fasteners Part 5: Set screws and similar threaded fasteners not under tensile stresses. 3 Dimensions See Figure 1 and Table 1. 4 Method of test Insert the short arm of the key into a female hexagon socket adapter having a Rockwell hardness of not less than 60 HRC. Smoothly apply an increasing load as near as possible to the end of the long arm until the proof torque is reached. The load shall be applied perpendicular to the axis of the key and the torque is calculated as the product of the applied load and the distance between the point of application of the load and the axis of the adapter. Test values are given in Table 2. Following the application of the minimum test torque, any possible damage or deformation shall not affect the usability of the key. For a key with a width across the flats of up to and including 14 mm, to torsion fracture, the hexagon socket screw key should show a deformation of at least 60° before failure. 5 Designation A socket screw key conforming to this International Standard shall be designated by: a) “Socket screw key”; b) reference to this International Standard; c) its width across the flats, s, in millimetres. EXAMPLE A hexagon socket screw key with a width across the flats s = 10 mm is designated as follows: Socket screw key ISO 2936-10 6 Marking Hexagon socket screw keys of 3 mm size and above shall be marked, legibly and permanently with at least: the name or trademark of the manufacturer (or responsible supplier); the width across flats size. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2936:1995(E) 2 © BSI 09-1999 Table 1 Dimensions 1) The corners may be sharp, rounded or chamfered and the radius of curvature or the chamfer respectively shall not be greater than half the difference between width across corners e and width across flats s. Each end shall be square with the axis of each arm within ± 4°. 2) e shall not be smaller than 1,5 mm. Figure 1 Hexagon socket screw key Dimensions in millimetres Width across flatsWidth across corners seaLl nom.tol.max.min.max.min. 0,7 +0,011 0,002 0,7110,6980,790,76326 0,9 0,011 0,024 0,8890,8760,990,963210 1,3 0,030 0,056 1,2701,2441,421,374012 1,5h91,5001,4751,681,63b4514 2 h10 2,001,962,252,18c5016 2,52,502,462,822,75c5618 33,002,963,393,31c6320 44,0003,9524,534,44c7025 55,0004,9525,675,58d8028 66,0005,9526,816,71d9032 88,0007,9429,098,9710036 1010,0009,94211,3711,2311240 12 h11 12,0011,8913,6513,4412545 1414,0013,8915,9315,7014056 1717,0016,8919,3519,0916063 1919,0018,8721,6321,3218070 2222,0021,8725,0524,7120080 2424,0023,8727,3326,9722490 2727,0026,8730,7530,36250100 3232,0031,8436,4535,98315125 3636,0035,8441,0140,50355140 a emax = 1,14 smax 0,03 (from s = 1,5 up to s = 36) emin = 1,13 smin(from s = 8 up to s = 36) b emin = 1,13 smin 0,04 c emin = 1,13 smin 0,03 d emin = 1,13 smin 0,02 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2936:1995(E) © BSI 09-19993 Table 2 Test values Width across flats of key s Minimum Rockwell hardness of key Minimum proof torquea Md Width across flats of hexagon socket adapter Key engagementb t min. max.min. mmN·mmmmmmm 0,7 52 HRC 0,080,7240,7111,5 0,90,180,9020,8891,7 1,30,531,2951,2702 1,50,821,5451,5202 21,92,0452,0202,5 2,53,82,5602,5203 36,63,0803,0203,5 4164,0954,0205 5305,0955,0206 6526,0956,0208 850 HRC1208,1158,02510 10 48 HRC 22010,11510,02512 1237012,14212,03215 1459014,14214,03217 17 45 HRC 98017,23017,05020 191 36019,27519,06523 222 11022,27522,06526 242 75024,27524,06529 273 91027,27527,06532 326 51032,33032,08038 369 26036,33036,08043 a M d = 0,85 (0,7 Rm) (0,224 5 s3) where Rm is the tensile strength. b t ë 1,2 s (t ë 1,5 s for sizes smaller than 1,5 mm). These values apply to the test only. In practice, key engagement is less. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2936:1995(E) 4 © BSI 09-1999 Annex A (informative) Bibliography 1 ISO 1703:1983, Assembly tools for screws and nuts Nomenclature. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:09:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2936:1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. 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