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1、INTERNATIONAL STANDARD IS0 4206 Second edition 1991-12-15 Counterbores with parallel shanks and solid pilots Outils 9 lamer, 5 queue cylindrique et pilote fixe Reference number IS0 4206:1991(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=N
2、ASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:16:19 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4206:1991 (E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bo
3、dies). The work of preparing International Standards is 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
4、and non-governmental, in liaison with ISO, also take pat-l in the work. IS0 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
5、 bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 4206 was prepared by Technical Committee ISO/TC 29, Small tools, Sub-Committee SC 2, Drills and reamers. This second edition cancels and r
6、eplaces the first edition (IS0 4206:1977), of which it constitutes a technical revision. Annex A of this International Standard is for information only Q IS0 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, inc
7、luding photocopying and microfilm, without permlsslon in writing from the publisher. International Organization for Standardization Case Postale 56 ? Cl-i-121 1 Gen&ve 20 ? Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license wi
8、th ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:16:19 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 4206:1991 (E) Counterbores with parallel shanks and solid pilots 1 Scope This International Standard specifie
9、s the dimen- sions, in millimetres, and the tolerances of counter- bores with parallel shanks and solid pilots for general use. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of
10、 publi- cation, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain
11、registers of cur- rently valid International Standards. IS0 286-2:1988, IS0 system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for ho/es and shafts. 3 Dimensions The dimensions and tolerances are shown in figure 1 and given in table 1. NOTE 1 Figure 1 illust
12、rating this lnternational Standard is diagrammatic only. It is not intended to show details of design. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:16:19 MDTNo reproducti
13、on or networking permitted without license from IHS -,-,- IS0 4206:1991(E) 1 NOTE - This figure shows a counterbore with cutting diameter d, greater than 5 mm. Figure 1 Table 1 Cutting diameter Pilot diameter Shank diameter 4 4 4 4 12 13 4 29) e81) h9) !z 2 Q d, Q 3,15 45 7 - 3,15d, 5 56 10 = d, 5d,
14、8 Diameter to be specified to suit pilot hole 71 14 31,5 diameter, when ordering (minimum poss- % d2 8d, G 10 ible diameter is d2 = l/3 d,) 80 18 35,5 lOd, Q 12,5 10 12,5 d, 20 12,5 100 22 40 1) See IS0 286-2. 2 Copyright International Organization for Standardization Provided by IHS under license w
15、ith ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:16:19 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4206:1991(E) Annex A (informative) Bibliography l IS0 4205:1991, Countersinks, 90 degrees, with parallel shanks and so/id pilots. C
16、opyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:16:19 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4206:1991(E) UDC 621.914.2 Descriptors: tool
17、s, cutting tools, counterboring cutters, dimensions. Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:16:19 MDTNo reproduction or networking permitted without license from IHS -,-,-