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. ISBN 978-0-626-22188-1 SANS 10111-2-5:1993 Edition 1 and nat. amdt 1 ISO 8015:1985 Edition 1 Any reference to SABS 0111-2-5 is deemed to be a reference t
4、o this standard (Government Notice No. 1373 of 8 November 2002)SOUTH AFRICAN NATIONAL STANDARD Engineering drawing Part 2-5: Geometrical tolerancing Fundamental tolerancing principle This national standard is the identical implementation of ISO 8015:1985 and is adopted with the permission of the Int
5、ernational Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of t
6、he SABS.SANS 10111-2-5:1993 Edition 1 and nat. amdt 1 ISO 8015:1985 Edition 1 Table of changes Change No. Date Scope Nat. amdt 1 2009 Amended to change the designation from SABS to SANS, with no technical changes. National foreword This South African standard was approved by National Committee SABS
7、TC 59, Construction standards, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in January 2009. This document supersedes SABS 0111-2-5:1993 (edition 1). This standard may only be used and printed by approv
8、ed subscription and freemailing clients of the SABS.*A - International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEIKAYHAPOHAR OPI-AHkl3AUMFl l-IO CTAHAPTM3Al_lWl.ORGANlSATlON INTERNATIONALE DE NORMALISATION Technical drawings - Fundamental tolerancing principle Dessins techniques - Pr
9、incipe de tolhancement de base First edition - 1985-12-15 UDC 744.4 : 621.753.1 Ref. No. IS0 8015-1985 (E) Descriptors : drawings, technical drawings, dimensional tolerances, angular tolerances, form tolerances, tolerances of position. 53 0 cn Price based on 5 pages SANS 10111-2-5:1993 SANS 10111-2-
10、5:1993This standard may only be used and printed by approved subscription and freemailing clients of the SABS.Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is
11、 normally carried out through IS0 technical committees. Each 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, govern- mental and non-governmental, in liaison with ISO, also take pa
12、rt in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member
13、 bodies voting. International Standard Technical drawings. IS0 8015 was prepared bY Technical Committee ISO/TC 10, Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition,
14、unless otherwise stated. 0 International Organization for Standardization, 1985 Printed in Switzerland SANS 10111-2-5:1993 SANS 10111-2-5:1993This standard may only be used and printed by approved subscription and freemailing clients of the SABS.INTERNATIONAL STANDARD IS0 8015-1985 (E) Technical dra
15、wings - Fundamental tolerancing principle 1 Scope This International Standard specifies the principle of the re- lationship between dimensional (linear and angular) tolerances and geometrical tolerances. 2 Field of application The specified principle shall be applied on technical drawings and relate
16、d technical documents to - linear dimensions and their tolerances ; - angular dimensions and their tolerances; - geometrical tolerances ; which define the following four aspects for each feature of the part : - size ; - form; - orientation ; - location. 3 References IS0 286/l, /SO system of limits a
17、nd fits tolerances, deviations and fits. 1 ) - Part 7: Bases of IS0 1101, Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols, indications on drawings. IS0 2692, Technical drawings - Geometrical tolerancing - Maxi
18、mum material principle. 2, 4 Principle of independency Each specified dimensional or geometrical requirement on a drawing shall be met independently, unless a particular re- lationship is specified. Therefore, where no relationship is specified, the geometrical tolerance applies regardless of featur
19、e size, and the two re- quirements are treated as being unrelated. Consequently, if a particular relationship of - size and form, or - size and orientation, or - size and location is required, it shall be specified on the drawing (see clause 6). 5 Tolerances 5.1 Dimensional tolerances 5.1 .I Linear
20、tolerances A linear tolerance controls only the actual local sizes (two-point measurements) of a feature, but not its form deviations (for example circularity and straightness deviations of a cylindrical feature or flatness deviations of two parallel plane surfaces). (See IS0 286/l.) Form deviations
21、 shall, however, be controlled by the following : - individually indicated form tolerances; - general geometrical tolerances ; - envelope requirement. NOTE - For the purposes of this International Standard, a single feature consists of a cylindrical surface or two parallel plane surfaces. There is n
22、o control of the geometrical interrelationship of individual features by the linear tolerances. For example, the perpendicularity of the sides of a cube is not controlled and, therefore, it requires a perpen- dicularity tolerance dictated by the design requirement. I) At present at the stage of draf
23、t. (Revision of ISO/ R 286-1962.) 2) At present at the stage of draft. (Revision of IS0 1101/2-1974.) 1 SANS 10111-2-5:1993 SANS 10111-2-5:1993This standard may only be used and printed by approved subscription and freemailing clients of the SABS.IS0 8015-1985(E) 5.1.2 Angular tolerances Form deviat
24、ions shall, however, be controlled by the following : An angular tolerance, specified in angular units, controls only the general orientation of lines or line elements of surfaces, but not their form deviations (see figure 1). The general orientation of the line derived from the actual sur- face is
25、the orientation of the contacting line of ideal geometrical form (see figure 1). The maximum distance between the con- tacting line and the actual line shall be the least possible value. A- Contacting line - individually indicated form tolerances; - general geometrical tolerances. 5.2 Geometrical to
26、lerances Geometrical tolerances control the deviation of the feature from its theoretically exact - form, or - orientation, or - location regardless of the feature size. The geometrical tolerances will, therefore, apply independently of the actual local sizes of individual features (see clause 4). T
27、he geometrical deviations may be at a maximum whether or not the cross-sections of the respective features are at maximum material size. Figure 1 For instance, a shaft with maximum material size at any cross- section may have a lobed form deviation within the circularity tolerance, and may also be b
28、ent by the amount of the straightness tolerance see figures 2a) and 2b)l. a) Drawing indication Maximum Ii - the maximum material principle (see 6.2). 6.1 Envelope requirement For a single feature, either a cylindrical surface or a feature established by two parallel plane surfaces (feature of size)
29、, the envelope requirement may be applied. The requirement means that the envelope of perfect form at maximum material size of the feature shall not be violated. The envelope requirement may be indicated either - by the symbol placed after the linear tolerance see figure 3a)l, or - by reference to a
30、n appropriate standard which invokes the envelope requirement. Example : Envelope requirement applied to a cylindrical feature a) Drawing indication 01 w - -2 oo- 2 72 - - z Gv Figure 3a) b) Functional requirements : - The surface of the cylindrical feature shall not extend beyond the envelope of pe
31、rfect form at maximum material size ofs150. - No actual local size shall be less than 0 149,96. This means that the actual part shall meet the following requirements: - each actual local diameter of the shaft shall remain within the size tolerance of 0,04 and, therefore, may vary between 8 150 and 0
32、 149,96 see figure 3b)l; A 0 1 -A- 6- G -t3” m-w m-m 1 dl , d2, d3 : actual local diameters Figure 3b) 3 SANS 10111-2-5:1993 SANS 10111-2-5:1993This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ll remain within the boundary of the envelope cylind
33、er of perfect form and of 0 150 see figures 3) - the entire shaft sha and 3d)l. Envelope of perfect form rat maximum material size 1 Actual local diameters Figuie 3) Envelope of perfect form 7 at maximum material size A z 6- t 0 Ln - G A T I Actual local diameters -I 8 149,96 Figure 3d) Hence it fol
34、lows that the shaft shall be exactly cylindrical when all actual local diameters are at the maximum material size of 0 150 see figure 3e)l. Envelope of perfect form r at maximum material size 7 A 4 0 0 Ln ln - - z z LActual local diameter Figure 3e) 4 SANS 10111-2-5:1993 SANS 10111-2-5:1993This stan
35、dard may only be used and printed by approved subscription and freemailing clients of the SABS.IS0 80154985 E) 6.2 Maximum material principle If for functional and economic reasons there is a requirement for the mutual dependency of the size and orientation or location of the feature(s), then the ma
36、ximum material principle 0 M may be applied (see IS0 2692). 7 7.1 Application on drawings Completeness of drawings The drawing should specify dimensional and geometrical tolerances necessary to check the part completely for its function. 7.2 Designation Drawings to which the principle of independenc
37、y applies shall be identified by being marked in or close to the drawing title block as follows: Tolerancing IS0 8015 This indication shall be supplemented by a reference to the ap- propriate standard for general geometrical tolerances or to other related documents. Some national standards (which sh
38、ould be referred to on the drawing) lay down that the envelope requirement for single features is the norm and is, therefore, not separately specified on the drawing. SANS 10111-2-5:1993 SANS 10111-2-5:1993This standard may only be used and printed by approved subscription and freemailing clients of
39、 the SABS. This page has been left blank intentionally This standard may only be used and printed by approved subscription and freemailing clients of the SABS. SABS Standards Division The objective of the SABS Standards Division is to develop, promote and maintain South African National Standards. T
40、his objective is incorporated in the Standards Act, 2008 (Act No. 8 of 2008). Amendments and Revisions South African National Standards are updated by amendment or revision. Users of South African National Standards should ensure that they possess the latest amendments or editions. The SABS continuo
41、usly strives to improve the quality of its products and services and would therefore be grateful if anyone finding an inaccuracy or ambiguity while using this standard would inform the secretary of the technical committee responsible, the identity of which can be found in the foreword. Tel: +27 (0)
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45、alled INFOPLUS, which ensures that subscribers automatically receive notification regarding amendments to, and revisions of, international standards. Tel: +27 (0) 12 428 6666 Fax: +27 (0) 12 428 6928 E-mail: infosabs.co.za Copyright The copyright in a South African National Standard or any other pub
46、lication published by the SABS Standards Division vests in the SABS. Unless exemption has been granted, no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means without prior written permission from the SABS Standards Division. This does not preclude the
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