1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 21.040.10 ISBN 0-626-15617-3 SANS 1700-2-14:1996 Edition 1 and nat. amdt 1 ISO 2901:1993 Edition 2 Any reference to SABS 1700-2-14 is deemed to be a
4、reference to this standard (Government Notice No. 1373 of 8 November 2002) SOUTH AFRICAN NATIONAL STANDARD Fasteners Part 2: Screw threads Section 14: ISO metric trapezoidal screw threads Basic profile and maximum material profiles This national standard is the identical implementation of ISO 2901:1
5、993 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof ! private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS
6、1700-2-14:1996 Edition 1 and nat. amdt 1 ISO 2901:1993 Edition 2 Table of changes Change No. Date Scope Nat. amdt 1 2004 Amended to change the designation of SABS standards to SANS standards with no technical changes. Abstract Specifies the basic profile and maximum material profiles of ISO metric t
7、rapezoidal screw threads. Keywords ISO metric threads, bolts, dimensions, fasteners, profile, screws threads, specifications, symbols, tables (data), threads, trapezoidal threads. National foreword This South African standard was approved by National Committee StanSA TC 5120.01, Screw threads and fa
8、steners, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This edition is technically identical to SABS 1700-2-14:1996. INTERNATIONAL STANDARD ISO 2901 Second edition 1993-10-15 ISO metric trapezoidal screw threads - Basic Profile and maxi
9、mum material profiles Filetages mktriques trapezoidaux ISO - Profil de base et profils 2 maximum de ma ti&e Reference number ISO 2901:1993(E) ISO 2901:1993(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies).
10、 The work of preparing International Standards is normally carried out through ISO technical committees. Esch 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-
11、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 f
12、or voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 2901 was prepared by Technical Committee lSO/TC 1, Screw threads. This second edition cancels and replaces the first edition (ISO 2901:1977), f igure
13、s 2 and 3 of which have been technically revised. 0 ISO 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or rnciudlng photocopylng and mlcrofilm, withou! per- by any me ans, elec-rronic or mechanlca/, mlssion In writing from th e publisher. internationa
14、l Organlzation for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD ISO 2901:1993(E) ISO metric trapezoidal screw threads - Basic Profile and maximum material profiles 1 Scope This International Standard specifies the basic Profile a
15、nd maximum material profiles of ISO metric trap- ezoidal screw threads. 2 Normative reference The following Standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the edition indicated was valid. All Sta
16、ndards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent edition of the Standard indicated below. Mem- bers of IEC and ISO maintain registers of currently valid International Standards.
17、ISO 2903: -l) - Tolerantes: ISO metrk trapezoidal screw threads 3 Symbols D major diameter of internal thread d major diameter of external thread (nominal di- ameter) D2 d2 Dl 4 P H Hl “C es 4 pitch diameter of internal thread pitch diameter of external thread minor diameter of internal thread minor
18、 diameter of external thread pitch height of fundamental triangle height of basic Profile crest clearance fundamental deviation on external threads*) Basic Profile The basic Profile is the theoretical Profile, and this is associated with the basic sizes of the major, pitch and minor diameters of the
19、 thread. The deviations are ap- plied to the basic sizes. 5 Basic Profile dimensions These dimensions are shown in figure 1 and given in table 1. 1) To be published. (Revision of ISO 2903:19771 2) See ISO 2903:1993, table 1. ISO 2901:1993(E) 1 i Axis of screw thread 6 Maximum material profiles Figur
20、e 1 - Basic Profile These profiles have prescribed clearances on the major, minor and pitch diameters referring to the basic Profile. In the case of manufacture by rolling, the Profile at the minor diameter tan be modified in Order to obtain a larger rounding on the root of the thread. The minor dia
21、meter d3 of the external thread may in this case be reduced by 0,15P. If modifications of these profiles become necessary, due to the particular methods of manufacture, they shall be agreed between the customer and the manufacturer. 7 Dimensions for maximum material profiles These dimensions are sho
22、wn in figures 2 and 3 and given in either table 2 or the following formulae: H, = 0,5P h3 = H4 = H, + a, = 0,5P + a, z = 0,25P = Hl/2 d3 = d-2xh,= d - 2(0,5P + a,) d2=D2=d-2z=d-0,5P Dl =d-2H, =d-P D,=d+2a, s = 0,267 95es R,max. = 0,5a, R,max. = a, ISO 2901:1993(E) Pitch H HP Hl P 1,866P 0,933P 0,5P
23、L5 2,799 1,400 0,75 0,549 2 3,732 1,866 1 0,732 3 5,598 2,799 lt5 1,098 4 7,464 3,732 2 1,464 5 9,330 4,665 25 1,830 6 11,196 5,598 3 2,196 7 13,062 6,531 3,5 2,562 8 14,928 7,464 4 2,928 9 16,794 8,397 415 3,294 10 18,660 9,330 5 3,660 12 22,392 11,196 6 4,392 14 26,124 13,062 7 5,124 16 29,856 14,
24、928 8 5,856 18 33,588 16,794 9 6,588 20 37,320 18,660 10 7,320 22 41,052 20,526 11 8,052 24 44,784 22,392 12 8,784 28 52,248 26,124 14 10,248 32 59,712 29,856 16 11,712 36 67,176 33,588 18 13,176 40 74,640 37,320 20 14,640 44 82,104 41,052 22 16,104 Table 1 - Basic Profile dimensions Dimensions in m
25、illimetres 0,366P ISO 2901:1993(E) - z aJ c E d .- u d c *- 0 c - tl 1) It is recommended to provide for a rounding or a chamfer equal to 0,5a, or less at the major diameter of the external threads. For rolled screw threads with pitch 2 to 12, it is recommended to provide for a rounding or a chamfer
26、 equal to 0,6a, or less at the major diumeter of the external threads. Figure 2 - Profiles for threads with clearance on the crest and without clearance on the flank L aJ c E d *- E c - 0 1) It is recommended to provide for a rounding or a chamfer equal to 0,5a, or less at the major diameter of the
27、external threads. For rolled screw threads with pitch 2 to 12, it is recommended to provide for a rounding or a chamfer equal to 0,6a, or less at the major diameter of the external threads. Figure 3 - Profiles for threads with clearance on the crest and on the flank 4 ISO 2901:1993(E) Table 2 - Dime
28、nsions for maximum material profiles Dimensions in millimetres Pitch P lt5 0,15 03 0,075 0,15 2 0,25 1,25 0,125 0,25 3 0,25 1,75 0,125 0,25 4 0,25 2,25 0,125 0,25 5 0,25 2,75 0,125 0,25 6 0,5 3,5 0,25 0,5 4 0,25 4,5 0,25 5 0,25 IO 12 14 5,5 0,25 6,5 0,25 8 0,5 16 18 20 9 10 11 22 24 28 12 13 15 32 36 40 44 0,5 0,5 015 0,5 015 1 1 1 1 1 1 1 1 1 1 1 17 19 21 23 0,5 0,5 0,5 0,5 0,5 015 0,5 0,5 0,5 015 015 0,5 0,5 0,5 0,5 1 1 1 1 1 1 1 1 1 1 1 aC H4 = h, 4 max. R2 max.
