1、BSI Standards PublicationBS ISO 16239:2013Metric series wires formeasuring screw threadsBS ISO 16239:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 16239:2013.The UK participation in its preparation was entrusted to TechnicalCommittee FME/9, Fasteners.A l
2、ist 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 contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLi
3、mited 2013ISBN 978 0 580 73781 7ICS 17.040.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2013.Amendments issued since publicationDate Text affectedB
4、S ISO 16239:2013 ISO 2013Metric series wires for measuring screw threadsPiges mtriques pour mesurage des filetagesINTERNATIONAL STANDARDISO16239First edition2013-11-01Reference numberISO 16239:2013(E)BS ISO 16239:2013ISO 16239:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 20
5、13All rights reserved. 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 request
6、ed from either ISO at 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 16239:2013ISO 16239:2013(E) ISO 2013 All ri
7、ghts reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Reference temperature 15 Material, hardness, and surface finish . 16 Nominal diameters of best-size wires 26.1 Wires for ISO general purpose metric screw threads (M) . 26.2 Wires for Unified scre
8、w threads (UN) 26.3 Wires for Whitworth pipe threads (G, R) . 26.4 Wires for ISO metric trapezoidal screw threads (Tr) 27 Tolerances of wires 48 Measurement methods for wires 48.1 Measuring the actual diameters of each wire 48.2 Determination of the difference of the actual diameters around a wire .
9、 49 Designation 6BS ISO 16239:2013ISO 16239:2013(E)ForewordISO (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
10、 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 Internationa
11、l Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different t
12、ypes of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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
13、 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 Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given
14、for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following U
15、RL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 1, Screw threads.iv ISO 2013 All rights reservedBS ISO 16239:2013INTERNATIONAL STANDARD ISO 16239:2013(E)Metric series wires for measuring screw threads1 ScopeThis International Standard specifies the mater
16、ial, metric series nominal diameters, diameter tolerances, and designation for screw thread measuring wires.This International Standard is applicable to the measurement of the pitch diameters of ISO general purpose metric screw threads (M), Unified screw threads (UN), Whitworth pipe threads (G, R),
17、and ISO metric trapezoidal screw threads (Tr) with standard pitches. These wires are intended for use on screw threads with a small lead angle, less than 5, and are mainly used to calibrate the pitch diameters of thread plug gauges.2 Normative referencesThe following documents, in whole or in part,
18、are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1, Geometrical Product Specifications (GPS) Standa
19、rd reference temperature for geometrical product specification and verificationISO 5408, Screw threads Vocabulary3 Terms and definitionsFor the purposes of this document, the terms and definitions in ISO 5408 and the following apply.3.1best-size wirewire that would touch an imaginary thread of zero
20、lead angle at the pitch cylinderNote 1 to entry: For symmetric threads, the diameter of a best-size wire is equal to P/(2 cos /2), where P is the pitch and /2 is the flank angle.4 Reference temperatureIn accordance with ISO 1, the dimension of the wire shall be related to the standard reference temp
21、erature of 20 C.5 Material, hardness, and surface finishThe wires shall be made from alloy tool steel that has been stabilized to ensure dimensional stability. The wires shall be free from cracks and other detrimental defects.The hardness shall be (760 50) HV5 over the measuring surface.The roughnes
22、s shall not exceed 0,4 m Rz over the measuring surface. ISO 2013 All rights reserved 1BS ISO 16239:2013ISO 16239:2013(E)6 Nominal diameters of best-size wires6.1 Wires for ISO general purpose metric screw threads (M)The nominal diameters of best-size wires and the allocation of pitches are given in
23、Table 1.Table 1 Nominal diameters of best-size wires and allocated pitches for M threadsDimensions in millimetresNominal diameter of wiresPitch PNominal diameter of wiresPitch P0,115 0,2 0,866 1,50,144 0,25 1,010 1,750,173 0,3 1,155 20,202 0,35 1,443 2,50,231 0,4 1,732 30,260 0,45 2,021 3,50,289 0,5
24、 2,309 40,346 0,6 2,598 4,50,404 0,7 2,887 50,433 0,75 3,175 5,50,462 0,8 3,464 60,577 1 4,619 80,722 1,25 6.2 Wires for Unified screw threads (UN)The nominal diameters of best-size wires and the allocation of number of threads per 25,4 mm are given in Table 2.6.3 Wires for Whitworth pipe threads (G
25、, R)The nominal diameters of best-size wires and the allocation of number of threads per 25,4 mm are given in Table 3.6.4 Wires for ISO metric trapezoidal screw threads (Tr)The nominal diameters of best-size wires and the allocation of pitches are given in Table 4.2 ISO 2013 All rights reservedBS IS
26、O 16239:2013ISO 16239:2013(E)Table 2 Nominal diameters of best-size wires and allocated threads per 25,4 mm for UN threadsNominal diameter of wires mmThreads per 25,4 mmNominal diameter of wires mmThreads per 25,4 mm0,183 80 0,917 160,204 72 1,047 14a0,229 64 1,128 130,262 56 1,222 120,306 48 1,275
27、11,5a0,333 44 1,333 110,367 40 1,466 100,407 36 1,629 90,458 32 1,833 8a0,524 28 2,095 70,543 27a2,444 60,611 24 2,933 50,733 20 3,259 4,50,815 18a3,666 4aThese wires may be used for USA pipe threads, such as NPT, NPSC, and NPTF threads.Table 3 Nominal diameters of best-size wires and allocated thre
28、ads per 25,4 mm for G and R threadsNominal diameter of wires mmThreads per 25,4 mmNominal diameter of wires mmThreads per 25,4 mm0,511 28 1,023 140,754 19 1,302 11Table 4 Nominal diameters of best-size wires and allocated pitches for Tr threadsDimensions in millimetresNominal diameter of wiresPitch
29、PNominal diameter of wiresPitch P0,776 1,5 7,247 141,035 2 8,282 161,553 3 9,317 182,071 4 10,353 202,588 5 11,388 223,106 6 12,423 243,623 7 14,494 284,141 8 16,564 324,659 9 18,635 365,176 10 20,706 406,212 12 22,776 44 ISO 2013 All rights reserved 3BS ISO 16239:2013ISO 16239:2013(E)7 Tolerances o
30、f wiresTwo tolerance grades for the diameter are standardized. They should be chosen according to the measurement uncertainty required.The diameter limit deviations and the maximum permissible differences of the actual diameters of the wires are given in Table 5.Table 5 Diameter limit deviations and
31、 maximum permissible differences of the actual diameters of the wiresTolerance itemTolerance gradeTolerance mRecommended measurement methodLimit deviations for the actual diameters of each wire to the nominal diameters specified10,5 8.1Maximum permissible difference of the actual diameters between t
32、he wires in a set0,25 8.1Maximum permissible difference of the actual diameters along the axis of a wire0,25 8.1Maximum permissible difference of the actual diameters around a wire0,25 8.2Limit deviations for the actual diameters of each wire to the nominal diameters specified21 8.1Maximum permissib
33、le difference of the actual diameters between the wires in a set0,5 8.1Maximum permissible difference of the actual diameters along the axis of a wire0,5 8.1Maximum permissible difference of the actual diameters around a wire0,5 8.28 Measurement methods for wires8.1 Measuring the actual diameters of
34、 each wireThe actual diameters of each wire should be measured in the three planes, E1, E2, and E3, perpendicular to the axis of the wire, and in each plane, two actual diameters should be measured in perpendicular directions (see Figure 1).The direct measurement or comparison measurement (using gau
35、ge blocks) for the actual diameters of each wire should be chosen according to the measurement uncertainty required.NOTE In some countries, the actual diameters of wires are measured in a deformed condition for the correction of the measuring force.8.2 Determination of the difference of the actual d
36、iameters around a wireThe difference of actual diameters around a wire should be determined by measuring the highest and the lowest points in a 60 groove, e.g. a ground thread plug gauge under a suitable measuring head (see Figure 2).The measuring positions of a wire are in the three planes, E1, E2,
37、 and E3 (see Figure 1).When rotating the wire in a 60 groove, the difference between the maximum and minimum readings on the measuring instrument shall be taken and divided by 1,5. The calculated result shall not exceed the value of the maximum permissible difference specified.4 ISO 2013 All rights
38、reservedBS ISO 16239:2013ISO 16239:2013(E)KeyE1, E2, E3 section planes of measurementThe three planes (E1, E2, and E3) are distributed evenly over the measuring axial length.a, bTwo local diameters in each section plane of measurement (E1, E2, or E3).Figure 1 Measuring positionsKey1 measuring instru
39、ment2 wire3 vee grooveFigure 2 Determination of the difference of the actual diameters around a wire in a 60 groove ISO 2013 All rights reserved 5BS ISO 16239:2013ISO 16239:2013(E)9 DesignationThe complete designation for a thread wire comprises the letter, “w”, the value of the wire nominal diamete
40、r, the figure indicating the tolerance grade, the serial number of the wire, and the manufacturers name or mark. The nominal diameter and tolerance grade are separated by a dash.EXAMPLEw 0,231 - 1 No. Name or mark w 4,141 - 2 No. Name or mark tolerance grade nominal diameter wire 6 ISO 2013 All righ
41、ts reservedBS ISO 16239:2013BS ISO 16239:2013ISO 16239:2013(E) ISO 2013 All rights reservedICS 17.040.30Price based on 6 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI i
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