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 21.100.10 ISBN 0-626-17595-X SANS 12129-1:2006Edition 1ISO 12129-1:1995Edition 1 SOUTH AFRICAN NATIONAL STANDARD Plain bearings Part 1: Fits This nat
4、ional standard is the identical implementation of ISO 12129-1:1995 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 internation
5、al code + 27 12 www.stansa.co.za Standards South Africa SANS 12129-1:2006 Edition 1 ISO 12129-1:1995 Edition 1 Table of changes Change No. Date Scope Abstract Specifies a system of fits applicable to metallic plain bearings used in general engineering for mean relative bearing clearances of 0,056 %
6、up to 0,315 %. Keywords bearings, clearances, dimensional deviations, dimensional tolerances, fits, plain bearings. National foreword This South African standard was approved by National Committee StanSA TC 5120.02, Bearings, in accordance with procedures of Standards South Africa, in compliance wit
7、h annex 3 of the WTO/TBT agreement. INTERNATIONAL STANDARD EO 12129-1 First edition 1995-04-01 Plain bearings - Part 1: . Fits Paliers lisses - Partie 7: Ajustements Reference number ISO 12129-1:1995(E) ISO 121291:1995(E) Foreword ISO (the International Organization for Standardization) is a worldwi
8、de federation of national Standards bodies (ISO member bodies). 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 tha
9、t committee. International organizations, governmental and non-governmentai, 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
10、 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 12129-1 was prepared by Technical Committee lSO/TC 123, Plain bearings, Subcommittee S
11、C 3, Dimensions, tolerantes and construction details. ISO 12129 consists of the following Parts, under the general title P/ain bearings: - Part 7: Fits - Part 2: shafts, Tolerantes flanges and on form and thrus t collars Position and surface roughness for 0 ISO 1995 All rights reserved. Unless other
12、wise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-121 1 Geneve 20
13、 l Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD 0 ISO ISO 12129=1:1995(E) Plain bearings - Part 1: . Fits 1 Scope This part of ISO 12129 specifies a System of fits ap- plicable to metallic plain bearings used in general en- gineering for mean relative bearing clearances I, 0,8; 1,12;
14、 1,32; 1,6; 1,9; 2,24; 3,15. 5.4 Symbol The Symbol for the mean relative bearing clearance is I,?. In view of the method of lettering with data processing and on typewriters, the letters PSI are used instead of the Greek letter $. 6 Ranges of nominal dimensions The ranges of nominal dimensions are m
15、ore closely stepped than in ISO 286-2 so that the maximum de- viation from the mean relative bearing clearance tirn tan be more closely adhered to. 7 Deviations The deviations for the shafts are given in table 1. 8 Minimum and maximum clearances The minimum and maximum clearances between the shaft a
16、nd bearing bore, together with the deviations for the shaft which are required for the calculation of the plain bearings, are given in table 1. 9 Example Shaft fit dimension 200 mm for a mean bearing clearance $m = 1 ,12 %o. QQOOPSI 1,12 ISO 121294:1995(E) (Blank pagd Nominal dimen- sion range mm De
17、viations for the shaft 1) Maximum and minimum clearances between shaft and bearing bore 2) v-n Pm Mean relative clearance, t+bm, %O Mean relative clearance, i 5oo 1 560 1 1;: 1 1:;: / 1: 1 1:; 1 1; 1 1;: 1 1; ;: 1 1; 85: 1 727 1 613 1 966 1 852 ;i 1 4:; I 6; I ;i I 2 / : E / : ;s 2 176 2 046 2 443 2
18、 313 2 751 2 605 3 066 2 920 3 425 3 254 3 818 3 647 1) The deviations of the shaft correspond to IT4 above the upper bold stepped line, to IT5 between the stepped lines, and to IT6 below the lower bold stepped line. 2) The Maximum and minimum clearances correspond to IT4/H 5 for the fit shaftlbearing bore above the upper bold stepped line, to IT5/H 6 between the bold stepped lines, and to IT6/H 7 be!ow the lower bold stepped line. Standards South AfricaThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .
