1、BS ISO 2901:2016ISO metric trapezoidal screwthreads Basic and designprofilesBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 2901:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 2901:2016.The UK participation in its p
2、reparation was entrusted to Technical Committee FME/9, Fasteners.A list of organizations represented 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 applicatio
3、n. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 91044 9 ICS 21.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committe
4、e on 30 September 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 2901:2016 ISO 2016ISO metric trapezoidal screw threads Basic and design profilesFiletages mtriques trapzodaux ISO Profils de base et nominalINTERNATIONAL STANDARDISO2901Third edition2016-09-15Refe
5、rence numberISO 2901:2016(E)BS ISO 2901:2016ISO 2901:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means,
6、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 the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Ve
7、rnier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 2901:2016ISO 2901:2016(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 15 Basic profile . 26 Design profile . 4Bibliography 6 ISO 2016 All rights reserved iiiCont
8、ents PageBS ISO 2901:2016ISO 2901:2016(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 member bo
9、dy 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 Electrot
10、echnical 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 types of IS
11、O 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/directives).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 res
12、ponsible 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 (see www.iso.org/patents).Any trade name used in this document is information give
13、n 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 World Trade Organization (WTO) principles in the Technical Barriers to Tr
14、ade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 1, Screw threads.This third edition cancels and replaces the second edition (ISO 2901:1993), which has been technically revised. The following changes have been made: the phrase “maxi
15、mum material profiles” has been replaced by “design profiles”; the reference ISO 2903 has been replaced by ISO 5408; the symbols have been updated; the definition of basic profile has been deleted; Figure 2 has been revised and Figure 3 has been deleted.iv ISO 2016 All rights reservedBS ISO 2901:201
16、6INTERNATIONAL STANDARD ISO 2901:2016(E)ISO metric trapezoidal screw threads Basic and design profiles1 ScopeThis document specifies the basic and design profiles of ISO metric trapezoidal screw threads.This document is chiefly applicable to traversing threads for traversing motion on machines, tool
17、s, etc. It can also be used for fastening threads.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5408 apply.ISO and IEC maintain terminological databases for use in standardizat
18、ion at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp4 SymbolsFor the purposes of this document, the following symbols apply.D major diameter of internal thread on basic profileD4major diameter of i
19、nternal thread on design profiled major diameter of external thread (nominal diameter)D2pitch diameter of internal threadd2pitch diameter of external threadD1minor diameter of internal threadd1minor diameter of external thread on basic profiled3minor diameter of external thread on design profileP pi
20、tchH fundamental triangle heightH2thread height on basic profileH0thread overlap on design profileH4thread height of internal thread on design profile ISO 2016 All rights reserved 1BS ISO 2901:2016ISO 2901:2016(E)h3thread height of external thread on design profileacclearances at major and minor dia
21、meters on design profilew width of flat crest or root on basic profileR1radius on crest corners of external thread on design profileR2radius on root corners of internal and external threads on design profile5 Basic profileThe basic profile is shown as a thick line in Figure 1. It is common to intern
22、al and external threads.The dimensions of the basic profile are given in Table 1.H = P/(2 tan15) = 1,866 025 404 PH2= 0,5 Pw = (H H2) P/(2H) = 0,366 PKey1 axis of screw threadFigure 1 Basic profile2 ISO 2016 All rights reservedBS ISO 2901:2016ISO 2901:2016(E)Table 1 Basic profile dimensionsDimension
23、s in millimetresPitchPH H/2 H2w1,5 2,799 1,400 0,75 0,5492 3,732 1,866 1 0,7323 5,598 2,799 1,5 1,0984 7,46 4 3,732 2 1,4645 9,330 4,665 2,5 1,8306 11,196 5,598 3 2,1967 13,062 6,531 3,5 2,5628 14,928 7,46 4 4 2,9289 16,794 8,397 4,5 3,29410 18,660 9,330 5 3,66012 22,392 11,196 6 4,39214 26,124 13,0
24、62 7 5,12416 29,856 14,928 8 5,85618 33,588 16,794 9 6,58820 37, 320 18,660 10 7, 32022 41,052 20,526 11 8,05224 44,784 22,392 12 8,78428 52,248 26,124 14 10,24832 59,712 29,856 16 11,71236 67,176 33,588 18 13,17640 74,640 37, 320 20 14,64044 82,104 41,052 22 16,104 ISO 2016 All rights reserved 3BS
25、ISO 2901:2016ISO 2901:2016(E)6 Design profileThe two design profiles are shown as a thick line in Figure 2. They are different between internal and external threads. The limit deviations are applied to the design profiles.The dimensions of the design profiles are given in Table 2.H0= H2= 0,5Ph3= H4=
26、 H0+ ac= 0,5P + acD1= d 2H0= d Pd2= D2= d H0= d 0,5Pd3= d 2h3= d 2(0,5P + ac)D4= d + 2acR1 max= 0,5acR2 max= acIn the case of manufacture by rolling, the profile at the minor diameter can be modified in order to obtain a larger rounding on the root of the external thread. The minor diameter d3of the
27、 external thread may in this case be reduced by 0,15P.If the modification of the profile becomes necessary, due to the particular methods of manufacture, it shall be agreed upon between the customer and the manufacturer.Key1 internal thread2 external threadFigure 2 Design profiles4 ISO 2016 All righ
28、ts reservedBS ISO 2901:2016ISO 2901:2016(E)Table 2 Design profile dimensionsDimensions in millimetresPitchPacH4= h3R1 maxR2 max1,5 0,15 0,9 0,075 0,152 0,25 1,25 0,125 0,253 0,25 1,75 0,125 0,254 0,25 2,25 0,125 0,255 0,25 2,75 0,125 0,256 0,5 3,5 0,25 0,57 0,5 4 0,25 0,58 0,5 4,5 0,25 0,59 0,5 5 0,
29、25 0,510 0,5 5,5 0,25 0,512 0,5 6,5 0,25 0,514 1 8 0,5 116 1 9 0,5 118 1 10 0,5 120 1 11 0,5 122 1 12 0,5 124 1 13 0,5 128 1 15 0,5 132 1 17 0,5 136 1 19 0,5 140 1 21 0,5 144 1 23 0,5 1 ISO 2016 All rights reserved 5BS ISO 2901:2016ISO 2901:2016(E)Bibliography1 ISO 5408, Screw threads Vocabulary6 IS
30、O 2016 All rights reservedBS ISO 2901:2016BS ISO 2901:2016ISO 2901:2016(E) ISO 2016 All rights reservedICS 21.040.10Price based on 6 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and se
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