1、BSI Standards PublicationBS ISO 492:2014Incorporating corrigendum October 2014BS ISO 492:2014Rolling bearings Radial bearings Geometrical product specifications (GPS) and tolerance valuesBS ISO 492:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 492:2014.
2、It supersedes BS ISO 492:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/7, Rolling bearings.A list of organizations represented on this committee can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
3、 necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014ISBN 978 0 580 88150 3ICS 21.100.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Stan
4、dard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2014.Amendments/corrigenda issued since publicationDate Text affected31 October 2014 Implementation of ISO corrected text 15 September 2014: Title corrected ISO 2014Rolling bearings Radial bearings Geome
5、trical product specifications (GPS) and tolerance valuesRoulements Roulements radiaux Spcification gomtrique des produits (GPS) et valeurs de tolranceINTERNATIONAL STANDARDISO492Fifth edition2014-07-15Reference numberISO 492:2014(E)Corrected version2014-09-15BS ISO 492:2014ISO 492:2014(E)ii ISO 2014
6、 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All 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, with
7、out 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 officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switze
8、rlandBS ISO 492:2014ISO 492:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 15 Limit deviations and tolerance values 175.1 General 175.2 Radial bearings except tapered roller bearings .185.3 Radial
9、tapered roller bearings 285.4 Radial bearings, outer ring flanges . 415.5 Basically tapered bores, tapers 1:12 and 1:3042Annex A (informative) Symbols and terms as given in ISO 492:2002 in relation to descriptions given in this International Standard .44Annex B (informative) Example of drawing indic
10、ations of characteristics with specification for radial bearings .48Annex C (informative) Illustration of ISO 11321 and ISO 144051 terms and definitions 50Annex D (informative) Description with illustrations for specification modifiers of linear sizes 57Bibliography .66BS ISO 492:2014ISO 492:2014(E)
11、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 body interested in a subject for which a te
12、chnical 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 Electrotechnical Commission (IEC) on all matters
13、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 ISO documents should be noted. This documen
14、t 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 responsible for identifying any or all such
15、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 given for the convenience of users and does n
16、ot 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 URL: Foreword - Supplementary informatio
17、nThe committee responsible for this document is ISO/TC 4, Rolling bearings, Subcommittee SC 4, Tolerances, tolerance definitions and symbols (including GPS).This fifth edition cancels and replaces the fourth edition (ISO 492:2002), which has been technically revised.This corrected version of ISO 492
18、:2014 incorporates the correction of the title.iv ISO 2014 All rights reservedBS ISO 492:2014ISO 492:2014(E)IntroductionThis International Standard is a machine element geometry standard as defined in the geometrical product specification (GPS) system as presented in master plan of ISO/TR 14638.12Th
19、e fundamental rules of ISO/GPS given in ISO 80158apply to this International Standard and the default decision rules given in ISO 14253-110apply to the specifications made in accordance with this International Standard, unless otherwise indicated.The connection between functional requirements, measu
20、ring technique and measuring uncertainty is always intended to be considered. The traditionally used measuring technique is described in ISO 1132-2.5For measurement uncertainty it is intended that ISO 14253-211should be considered. ISO 2014 All rights reserved vBS ISO 492:2014Rolling bearings Radial
21、 bearings Geometrical product specifications (GPS) and tolerance values1 ScopeThis International Standard specifies dimensional and geometrical characteristics, limit deviations from nominal sizes, and tolerance values to define the interface (except chamfers) of radial rolling bearings. Nominal bou
22、ndary dimensions are defined in ISO 15, ISO 3552and ISO 84439.This International Standard does not apply to certain radial bearings of particular types (e.g. needle roller bearings) or for particular fields of application (e.g. airframe bearings and instrument precision bearings). Tolerances for suc
23、h bearings are given in the relevant International Standards.Chamfer dimension limits are given in ISO 582.2 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 the edition
24、 cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 15, Rolling bearings Radial bearings Boundary dimensions, general planISO 582, Rolling bearings Chamfer dimensions Maximum valuesISO 1101, Geometrical product specifications (
25、GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-outISO 5593, Rolling bearings VocabularyISO 14405-1, Geometrical product specifications (GPS) Dimensional tolerancing Part 1: Linear sizesISO/TS 17863, Geometrical product specification (GPS) Geometrical tolerancing of mo
26、veable assemblies3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 1101, ISO 5593, ISO 14405-1, and ISO/TS 17863 apply.4 SymbolsTo express that the ISO/GPS system, ISO 80158, is applied, the dimensional and geometrical characteristics shall be included
27、in the technical product documentation (for example, on the drawing). The dimensional and geometrical specifications, associated to these characteristics are described in Table 1 and Figures 1 to 17.Descriptions for symbols are in accordance with GPS terminology; relationships with traditional terms
28、 are described in Annex A.A tolerance value associated to a characteristic is symbolised by t followed by the symbol for the characteristic, for example tVBs.In this International Standard, the ISO default specification operator for size is in accordance with ISO 14405-1, i.e. the two-point size is
29、valid. Some specification modifiers are described in Annex D.INTERNATIONAL STANDARD ISO 492:2014(E) ISO 2014 All rights reserved 1BS ISO 492:2014ISO 492:2014(E)The detailed definitions for terms in ISO 1101 and ISO 14405-1 and traditional terms in ISO 1132-14are not fully equal. For differences, see
30、 Annex C.Table 1 Symbols for nominal sizes, characteristics, and specification modifiersSymbol for nominal dimension (size and distance)aSym-bol for charac-teristicaGPS symbol and specifica-tion modifierbcDescriptiondSee FigureBNominal inner ring width 1; 2; 12VBsSymmetrical rings: range of two-poin
31、t sizes of inner ring width1; 12ALSGNeAsymmetrical rings: range of minimum circumscribed sizes of inner ring width, between two opposite lines, obtained from any longitudinal section which includes the inner ring bore axis2; 7BsSymmetrical rings: deviation of a two-point size of inner ring width fro
32、m its nominal size1; 12ALSGNeAsymmetrical rings, upper limit: deviation of a minimum circumscribed size of inner ring width, between two opposite lines, in any longitudinal section which includes the inner ring bore axis, from its nominal size2; 7Asymmetrical rings, lower limit: deviation of a two-p
33、oint size of inner ring width from its nominal size2 ISO 2014 All rights reservedBS ISO 492:2014ISO 492:2014(E)Table 1 (continued)Symbol for nominal dimension (size and distance)aSym-bol for charac- teristicaGPS symbol and specifica-tion modifierbcDescriptiondSee FigureCNominal outer ring width 1; 7
34、; 12VCsSymmetrical rings: range of two-point sizes of outer ring width1; 7ALSGNeAsymmetrical rings: range of minimum circumscribed sizes of outer ring width between two opposite lines, obtained from any longitudinal section which includes the outer ring outside surface axis2; 12CsSymmetrical rings:
35、deviation of a two-point size of outer ring width from its nominal size1; 7ALSGNeAsymmetrical rings, upper limit: deviation of a minimum circumscribed size of outer ring width, between two opposite lines, in any longitudinal section which includes the outer ring outside surface axis, from its nomina
36、l size2; 12Asymmetrical rings, lower limit: deviation of a two-point size of outer ring width from its nominal sizeC1Nominal outer ring flange width 12VC1sRange of two-point sizes of outer ring flange width12C1sDeviation of a two-point size of outer ring flange width from its nominal size12dNominal
37、bore diameter of a cylindrical bore or at the theoretical small end of a tapered bore1 to 7; 12 to 16Vdmp ACSRange of mid-range sizes (out of two-point sizes) of bore diameter obtained from any cross-section of a cylindrical bore1; 2; 12dmpACSCylindrical bore: deviation of a mid- range size (out of
38、two-point sizes) of bore diameter in any cross-section from its nomi-nal size1; 2; 12SCSfTapered bore: deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical small end from its nominal size7Vdsp ACSRange of two-point sizes of bore diameter in any cross-section of
39、a cylindrical or tapered bore1; 2; 7; 12dsDeviation of a two-point size of bore diam-eter of a cylindrical bore from its nominal size1; 2; 12 ISO 2014 All rights reserved 3BS ISO 492:2014ISO 492:2014(E)Table 1 (continued)Symbol for nominal dimension (size and distanceaSym-bol for charac-teristiaGPS
40、symbol and specifica-tion modifierbcDescriptiondSee Fig-ured1Nominal diameter at the theoretical large end of a tapered bore7d1mp SCSfDeviation of a mid-range size (out of two-point sizes) of bore diameter at the theo-retical large end of a tapered bore from its nominal size7DNominal outside diamete
41、r 1 to 16VDmp ACSRange of mid-range sizes (out of two-point sizes) of outside diameter obtained from any cross-section1; 2; 7; 12Dmp ACSDeviation of a mid-range size (out of two-point sizes) of outside diameter in any cross-section from its nominal size1; 2; 7; 12VDsp ACSRange of two-point sizes of
42、outside diameter in any cross-section1; 2; 7; 12DsDeviation of a two-point size of outside diameter from its nominal size1; 2; 7; 12D1Nominal outside diameter of outer ring flange12D1sDeviation of a two-point size of outside diameter of outer ring flange from its nomi-nal size12KeagCircular radial r
43、un-out of outer ring outside surface of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface4; 5; 6; 9; 10; 11; 14; 15; 16KiagCircular radial run-out of inner ring bore surface of assembled bearing with respect to datum, i.e. axis, established from the out
44、er ring outside surface4; 5; 6; 9; 10; 11; 14; 15; 16SdgCircular axial run-out of inner ring face with respect to datum, i.e. axis, established from the inner ring bore surface3; 8; 13SDPerpendicularity of outer ring outside sur-face axis with respect to datum established from the outer ring face3;
45、8SD1Perpendicularity of outer ring outside sur-face axis with respect to datum established from the outer ring flange back face134 ISO 2014 All rights reservedBS ISO 492:2014ISO 492:2014(E)Table 1 (continued)Symbol for nominal dimension (size and distance)aSym-bol for charac-teristicaGPS symbol and
46、specification modifierbcDescriptiondSee Fig-ureSeagCircular axial run-out of outer ring face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface5; 6; 10; 11Sea1gCircular axial run-out of outer ring flange back face of assembled bearing with respect to
47、datum, i.e. axis, established from the inner ring bore surface15; 16SiagCircular axial run-out of inner ring face of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface5; 6; 10; 11; 15; 16SL hTaper slope is the difference between nominal diameters at t
48、he theoretical large end and small end of a tapered bore (d1 d)7SLDeviation of taper slope of a tapered inner ring bore from its nominal size i7T Nominal assembled bearing width 17Ts GNgDeviation of minimum circumscribed size of assembled bearing width from its nominal size17T1Nominal effective widt
49、h of inner subunit assembled with a master outer ring17T1s GNgDeviation of minimum circumscribed size of effective width (inner subunit assembled with a master outer ring) from its nominal size17T2Nominal effective width of outer ring assembled with a master inner subunit17T2s GNgDeviation of minimum circumscribed size of effective width (outer ring assem-bled with a master inner subunit) from its nominal size17 ISO 2014 All rights reserved 5BS ISO 492:2014ISO 492:2014(E)Tab
