1、BSI Standards PublicationBS ISO 2351-3:2014Assembly tools for screws andnuts Machine-operatedscrewdriver bitsPart 3: Screwdriver bits for hexagon socketscrewsBS ISO 2351-3:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 2351-3:2014. Itsupersedes BS ISO 235
2、1-3:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MTE/15, Hand tools.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a co
3、ntract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 80092 4ICS 25.140.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the aut
4、hority of theStandards Policy and Strategy Committee on 28 February 2014.Amendments issued since publicationDate Text affectedBS ISO 2351-3:2014 ISO 2014Assembly tools for screws and nuts Machine-operated screwdriver bits Part 3: Screwdriver bits for hexagon socket screwsOutils de manoeuvre pour vis
5、 et crous Embouts tournevis machine Partie 3: Embouts tournevis pour vis six pans creuxINTERNATIONAL STANDARDISO2351-3Second edition2014-02-01Reference numberISO 2351-3:2014(E)BS ISO 2351-3:2014ISO 2351-3:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved.
6、 Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at
7、the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 2351-3:2014ISO 2351-3:2014(E) ISO 2014 All rights reserved iiiCon
8、tents PageForeword iv1 Scope . 12 Normative references 13 Dimensions . 14 Technical requirements 35 Torque test 36 Designation 47 Marking 4Bibliography 5BS ISO 2351-3:2014ISO 2351-3:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standard
9、s 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 organiz
10、ations, 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.The procedures used to develop this document and those intended for its fur
11、ther maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directi
12、ves). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the I
13、ntroduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related
14、to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 29, Small tools, Subcommittee SC 10, Assembly tools fo
15、r screws and nuts, pliers and nippers.This second edition cancels and replaces the first edition (ISO 2351-3:2002), of which it constitutes a minor revision with the following changes: designation according to ISO 1703 has been included; references have been updated; minimum proof torque values in T
16、able 2 have been corrected; relation of minimum proof torque and MdISO 2936 in Table 2 has been defined exactly.ISO 2351 consists of the following parts, under the general title Assembly tools for screws and nuts Machine-operated screwdriver bits: Part 1: Screwdriver bits for slotted head screws Par
17、t 2: Screwdriver bits for cross-recessed head screws Part 3: Screwdriver bits for hexagon socket screwsiv ISO 2014 All rights reservedBS ISO 2351-3:2014INTERNATIONAL STANDARD ISO 2351-3:2014(E)Assembly tools for screws and nuts Machine-operated screwdriver bits Part 3: Screwdriver bits for hexagon s
18、ocket screws1 ScopeThis part of ISO 2351 prescribes the technical specifications for machine-operated screwdriver bits for hexagon socket screws, listed in ISO 1703 under reference number 3 2 03 01 0. It applies to bits with male hexagon drive or with cylindrical flat-end drive as defined in ISO 117
19、3 and to tips for screwdrivers as defined in ISO 2936. It also gives recommended combinations between tips and bits.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only th
20、e edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1173, Assembly tools for screws and nuts Drive ends for hand- and machine-operated screwdriver bits and connecting parts Dimensions, torque testingISO 2936, Assembly
21、tools for screws and nuts Hexagon socket screw keys3 DimensionsFigure 1 and Table 1 show the recommended combinations of screwdriver bits for hexagon socket screws.The shape of the liaison between the tip and the driver end is at the discretion of the manufacturer. ISO 2014 All rights reserved 1BS I
22、SO 2351-3:2014ISO 2351-3:2014(E)Key1 Form A2 Form C3 Form E4 Form GaPart in contact with the screw (in accordance with ISO 2936).bDriver end (in accordance with ISO 1173).Figure 1 Screwdriver bits2 ISO 2014 All rights reservedBS ISO 2351-3:2014ISO 2351-3:2014(E)Table 1 Recommended combinations betwe
23、en tip and driver endNominal width across flat s (in accordance with ISO 2936)l2min mmNominal male hexagon or cylindrical flat end of form (in accordance with ISO 1173)A 3 A 5,5 C 4 C 6,3 C 8 C 12,5 E 6,3 E 8 E 11,2 G 7l1 2 mm45 50 28 25 30 50 50 50 55 630,7 1,7 X X0,9 1,9 X X1,3 2,3 X X1,5 2,3 X X
24、X X2 3 X X X X X2,5 3,8 X X X X X X3 4,5 X X X X X X X X X4 6 X X X X X X X5 7,5 X X X X X X X6 9 X X X X X X7 10,5 X X X X8 12 X X X X10 16 X X12 18 X4 Technical requirementsThe bits must have a complete heat treatment.The technical specifications of bits are the same as those for screwdrivers in a
25、ccordance with ISO 2936.5 Torque testThe drive end shall be fully engaged in a female holder in accordance with ISO 1173. The drive end shall be inserted in a test socket adapter with a minimum hardness of 62 HRC as used for hexagon socket screw keys in accordance with ISO 2936.The test force shall
26、be applied smoothly until the minimum torque value given in Table 2 is reached or until the tool fractures or deforms before this torque value is reached.Following the application of the minimum test torque, any resulting damage or deformation shall not affect the usability of the tool. ISO 2014 All
27、 rights reserved 3BS ISO 2351-3:2014ISO 2351-3:2014(E)Table 2 Torque testNominal width across flats sMinimum Rockwell hardness of bitsMinimum proof torqueaMdN m0,756 HRC0,10,9 0,21,3 0,61,5 1,02 2,22,5 4,43 7,74 195 356 607 938 13910 25512 429aMinimum proof torque = 1,16 MdISO 2936.6 DesignationA sc
28、rewdriver bit according to this part of ISO 2351 is designated by the following:a) “Bit”;b) a reference to this part of ISO 2351 (i.e. ISO 2351-3);c) the form and nominal dimensions of the drive end (in accordance with ISO 1173);d) the nominal width across the flats of the tip, s (in accordance with
29、 ISO 2936).EXAMPLE A screwdriver bit for hexagon socket screws with a drive end E 11,2 (in accordance with ISO 1173) and a nominal width across the flats of the tip, s, (in accordance with ISO 2936) of 6 is designated as follows:Bit ISO 2351-3 E 11,2 - 67 MarkingScrewdriver bits in accordance with t
30、his part of ISO 2351 shall be marked permanently and legibly witha) the name of the manufacturer or suppliers, andb) the nominal width across flat, s.For male hexagons A 3 and C 4, the marking shall be given only on the smallest commonly used packaging unit.4 ISO 2014 All rights reservedBS ISO 2351-
31、3:2014ISO 2351-3:2014(E)Bibliography1 ISO 1703, Assembly tools for screws and nuts Designation and nomenclature ISO 2014 All rights reserved 5BS ISO 2351-3:2014ISO 2351-3:2014(E) ISO 2014 All rights reservedICS 25.140.01Price based on 5 pagesThis page deliberately left blankBSI is the national body
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