1、BRITISH STANDARD BS EN ISO 5458:1999 Geometrical Product Specifications (GPS) Geometrical tolerancing Positional tolerancing The European Standard EN ISO 5458:1998 has the status of a British Standard ICS 17.040.01BSEN ISO 5458:1999 This British Standard, having been prepared under the directionof t
2、he Engineering SectorCommittee, was publishedunder the authorityofthe Standards Committee and comes into effect on 15 May 1999 BSI 03-2000 ISBN 0 580 32487 7 National foreword This British Standard is the English language version of EN ISO 5458:1998. It is identical with ISO 5458:1998. It partially
3、supersedes BS 308-3:1990 which is expected to be finally withdrawn on 2000-06-30. The UK participation in its preparation was entrusted to Technical Committee TDE/4, Engineering drawing, metrology, precision measurement and all related documentation, which has the responsibility to: aid enquirers to
4、 understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represent
5、ed on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence
6、Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itsel
7、f confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 10 and a back cover. This standard has been updated (see copyright date) and may have
8、had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN ISO 5458:1999 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Foreword iii Text of ISO 5458 1ii blankEUROPE
9、AN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5458 December 1998 ICS 01.100.01 English version Geometrical product specifications (GPS) Geometrical tolerancing Positional tolerancing (ISO 5458:1998) Spcification gomtrique des produits (GPS) Tolrancement gomtrique Tolrancement de localisation (I
10、SO 5458:1998) Geometrische Produktspezifikation (GPS) Form- und Lagetolerierung Positionstolerierung (ISO 5458:1998) This European Standard was approved by CEN on 15 December 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
11、s European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (E
12、nglish, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRe
13、public, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de S
14、tassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5458:1998 EEN ISO 5458:1998 BSI 03-2000 2 Foreword The text of the International Standard ISO5458:1998 has been prepared by Technical Committee IS
15、O/TC 213 “Dimensional and geometrical product specification and verification” in collaboration with Technical Committee CEN/TC 290 “Dimensional and geometrical product specification and verification”, the secretariat of which is held by DIN. This European Standard shall be given the status of a nati
16、onal standard, either by publication of an identical text or by endorsement, at the latest by June 1999, and conflicting national standards shall be withdrawn at the latest by June 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countrie
17、s are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. The Annex A, Annex B, Annex C and Annex D of this Europea
18、n Standard are informative only. Endorsement notice The text of the International Standard ISO5458:1998 has been approved by CEN as a European Standard without any modification.EN ISO 5458:1998 ii BSI 03-2000 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative reference 1 3 Definitions 1
19、 4 Establishment of positional tolerances 1 5 Tolerance combinations 7 Annex A (informative) Definitions 8 Annex B (informative) Former practice 8 Annex C (informative) Relation to the GPS matrix model 9 Annex D (informative) Bibliography 10 Figure 1 2 Figure 2a) 3 Figure 2b) 3 Figure 3a) 4 Figure 3
20、b) 4 Figure 4a) 5 Figure 4b) 5 Figure 5a) 6 Figure 5b) 6 Figure 6 6 Figure 7a) 7 Figure 7b) 7 Figure 7c) 7 Figure B.1 8 Figure C.1 9 Descriptors: Drawings, technical drawings, dimensioning, geometrical tolerances, tolerances of position.EN ISO 5458:1998 BSI 03-2000 iii Foreword ISO (the Internationa
21、l 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 technical committee has been es
22、tablished 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 of electrotechnical standardi
23、zation. Draft International Standards adopted by 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 5458 was prepared by Technical Committ
24、ee ISO/TC 213, Dimensional and geometrical product specifications and verification. This second edition cancels and replaces the first edition (ISO 5458:1987), which has been technically revised. Annex A, Annex B, Annex C and Annex D of this International Standard are for information only.iv blankEN
25、 ISO 5458:1998 BSI 03-2000 1 Introduction This International Standard is a geometrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISO/TR 14638). It influences chain links 1 and 2 of the chain of standards on location. For more detailed information of th
26、e relation of this standard to the GPS matrix model, see Annex C. This International Standard is intended to promote the relationship between the designer and the manufacturer. The concept of positional tolerancing, as described in ISO 1101, is further elaborated in this InternationalStandard. The f
27、igures in this International Standard serve to illustrate the subject matter only and are not necessarily complete. Other relevant International Standards, such as those dealing with the maximum material requirement (ISO 2692), datums and datum systems (ISO 5459), should be taken into consideration
28、when using this International Standard. For the purposes of this International Standard, all dimensions and tolerances on the drawings have been shown in vertical lettering. It should be understood that these indications could just as well be written in free-hand or inclined (italic) lettering witho
29、ut altering the meaning of the indications. For the presentation of lettering (proportions and dimensions), see ISO 3098-1. 1 Scope This International Standard describes positional tolerancing. This tolerancing method is applied to the location of a point, of a line nominally straight and of a surfa
30、ce nominally plane, e.g. the centre of a sphere, the axis of a hole or shaft and the median surface of a slot. NOTEProfile tolerancing is used when lines are not intended to be straight or surfaces are not intended to lie in a plane; seeISO1660. 2 Normative reference The following standard contains
31、provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the
32、 possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1101:, Geometrical Product Specifications (GPS) Geometrical tolerancing Generalities, definitions, symbols, indication on drawin
33、gs 1) . 3 Definitions Definitions related to features are under development and will be issued as ISO 14660-1. This work will result in new terms that are different from those used in this International Standard. These new terms are defined in Annex A and appear in the main body of this Internationa
34、l Standard in parentheses next to the currently used term. 4 Establishment of positional tolerances 4.1 General The primary constituents are theoretically exact dimensions, tolerance zones and datums. 4.2 Fundamental requirement Positional tolerances are associated with theoretically exact dimension
35、s and define the limits for the location of actual (extracted) features, such as points, axes, median surfaces, nominally straight lines and nominally plane surfaces relative to each other or in relation to one or more datums. The tolerance zone is symmetrically disposed about the theoretically exac
36、t location. 1) To be published. (Revision of ISO 1101:1983)EN ISO 5458:1998 2 BSI 03-2000 NOTEPositional tolerances do not accumulate when theoretically exact dimensions are arranged in a chain (seeFigure4). (Thiscontrasts with dimensional tolerances that are arranged in a chain.) Positional toleran
37、cing allows clear reference to be made to one or more datums. 4.3 Theoretically exact dimensions Theoretically exact dimensions, both angular and linear, are indicated by being enclosed in a rectangular frame in accordance with ISO 1101. This is illustrated in Figure 2 a), Figure 2 b), Figure 3 a),
38、Figure 4 a), Figure 5 a) and Figure 7 a). The theoretically exact dimensions 0 and 90 , 180 or distance 0 between positionally toleranced features not related to a datum see Figure 4 a) and Figure 5 a), positionally toleranced features related to the same datum(s) see Figure 2 a), positionally toler
39、anced features and their related datums (see Figure 1), are implied without specific indication. When the positional tolerance features share the same centreline or axis they are regarded as theoretically exactly related features, unless otherwise specified, e.g. in relation to different datums or o
40、ther reason indicated by an appropriate note on the drawing as shown in Figure 2 b). 4.4 Positional tolerances on a complete circle When positionally toleranced features are arranged in a complete circle it is understood that the features are equally spaced, unless otherwise stated, and that their l
41、ocations are theoretically exact. If two or more groups of features are shown on the same axis, they shall be considered to be a single pattern when they are not related to a datum; they are related to the same datum or datum system (datums in the same order of precedence or under the same material
42、conditions) see Figure 2 a); unless otherwise stated see Figure 2 b). Indication on the drawing Explanation Cases a), b), c) or d) may apply at each individual hole: a)axis of hole coincident with theoretically exact location (zerodeviation); b)axis of hole at maximum position deviation with zero pe
43、rpendicularity deviation; c)axis of hole at maximum position deviation with maximum perpendicularity deviation; d)axis of hole at maximum position deviation; in this case a combination of geometrical deviations. Figure 1 EN ISO 5458:1998 BSI 03-2000 3 4.5 Directions of positional tolerances 4.5.1 Po
44、sitional tolerances in one direction only The tolerance value can be specified in one direction. The orientation of the width of the tolerance zone is based on the pattern of the theoretically exact dimensions and is at 0 or 90 as indicated by the direction of the arrow line see Figure 3 a) and Figu
45、re 3 b) unless otherwise indicated. Figure 2 a) Figure 2 b) EN ISO 5458:1998 4 BSI 03-2000 Indication on the drawing Figure 3 a) Explanation Key 1Simulated datum A 2Simulated datum B Each of the scale lines shall be contained within a tolerance zone defined by two parallel straight lines 0,1 apart w
46、hich are symmetrically disposed about the theoretically exact position of each scale line relative to each other. Figure 3 b) EN ISO 5458:1998 BSI 03-2000 5 4.5.2 Positional tolerances in two directions The tolerance value can be specified in two directions perpendicular to each other, reference bei
47、ng made to unequal values see Figure 4 a) and Figure 4 b) or equal values. The rectangular pattern consisting of the eight tolerance zones, placed 30 mm apart from each other, is a floating one, the location and orientation of which depends on the considered actual (extracted) features of the workpi
48、ece. Each of the holes shall be: measured in the direction of the theoretically exact dimension 30; its actual (extracted) median surface lies within a tolerance zone with a rectangular cross section 0,3 actual length of the feature; measured in the direction of the theoretically exact dimension 28;
49、 its actual (extracted) median surface lies within a tolerance zone with a rectangular cross section 0,1 actual length of the feature; the median planes of the tolerance zones are fixed by theoretically exact dimensions. Indication on the drawing Figure 4 a) Explanation Figure 4 b) EN ISO 5458:1998 6 BSI 03-2000 4.5.3 Multi-directional positional tolerances The tolerance is specified as a cylindrical zone see Figure 5 a) and Figure 5 b). The “rigid rectangular pattern” consisting of the eight t
