1、BRITISH STANDARD BS EN ISO 6411:1997 BS 308-1.23: 1997 Technical drawings Simplified representation of centre holes The European Standard EN ISO6411:1997 has the status of a British Standard ICS 01.100.20BS EN ISO 6411:1997 This British Standard, having been prepared under the direction of the Engin
2、eering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 05-1999 ISBN 0 580 28773 4 National foreword This British Standard is the English language version of EN ISO6411:1997. It is identical with ISO6411:1982. It partially supersede
3、s BS 308-1:1993. It is envisaged that when the full range of European Standards on technical drawing is implemented BS308 will be withdrawn. The UK participation in its preparation was entrusted to Technical Committee TDE/4, Engineering drawing, Metrology, Precision measurement and all related docum
4、entation, which has the responsibility to: aid enquirers to 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 p
5、romulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with th
6、eir corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Elec
7、tronic 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 itself confer immunity from legal obligations. Summary of pages This d
8、ocument comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, page ii, pages 1 to 5 and aback cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment tabl
9、e on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS EN ISO 6411:1997 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Foreword ii Text of ISO 6411 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6411 October 1997 ICS
10、01.100.20 Descriptors: See ISO document English version Technical drawings Simplified representation of centre holes (ISO6411:1982) Dessins techniques Reprsentation simplifie des trous de centre (ISO6411:1982) Technische ZeichnungenVereinfachte Darstellung von Zentrierbohrungen (ISO6411:1982) This E
11、uropean Standard was approved by CEN on 12 September 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical referen
12、ces 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 (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into
13、 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, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spa
14、in, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN na
15、tional Members. Ref. No. EN ISO 6411:1997 EEN ISO6411:1997 BSI 05-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC10 “Technical drawings, product definition and related documentation” of the International Organization for Standardization (ISO) has been taken ove
16、r as an European Standard by CEN/CS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 1998, and conflicting national standards shall be withdrawn at the latest by April 1998. According to the
17、 CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swe
18、den, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO6411:1982 has been approved by CEN as a European Standard without any modification. Contents Page Foreword 2 1 Scope and field of application 1 2 References 1 3 Indication on drawings 1 4 Interpreta
19、tion of indication 1 Annex A Dimensions for centre holes type R, A and B 4 Annex B Proportions and dimensions of symbols 4 Figure 5 Table 1 Representation and designation of centre holes on drawings 2 Table 2 Interpretation of the designation 3 Table 3 Dimensions of preferred centre holes 4 Table 4
20、Dimensions, in millimetres 4EN ISO 6411:1997 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees
21、. Every member body interested in a subject for which a technical committee has been set up 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. Draft International Standards adopted by the
22、 technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO6411 was developed by Technical Committee ISO/TC10, Technical drawings, and was circulated to the member bodies in January 1980. It
23、has been approved by the member bodies of the following countries: The member body of the following country expressed disapproval of the document on technical grounds: Netherlands Descriptors: Engineering drawings, centre holes, graphic methods, generalities, designation. Australia France Poland Aus
24、tria Germany, F. R. Romania Belgium India South Africa, Rep. of Brazil Italy Spain Canada Japan Sweden China Korea, Dem. P. Rep. of Switzerland Czechoslovakia Korea, Rep. of United Kingdom Denmark Mexico USA Finland Norway USSREN ISO 6411:1997 BSI 05-1999 1 1 Scope and field of application This Inte
25、rnational Standard specifies the simplified representation of centre holes and their designation. Simplified representation of centre holes may be used particularly when is not necessary to show the exact form and size and where the designation of standardized centre holes is sufficient for informat
26、ion. 2 References ISO 128, Technical drawingsGeneral principles of presentation. ISO 866, Centre drills for centre holes without protecting chamfersType A. ISO 2540, Centre drills for centre holes with protecting chamfersType B. ISO 2541, Centre drills for centre holes with radius formType R. ISO 30
27、98/1, Technical drawingsLettering Part 1: Currently used characters. ISO 6428, Technical drawingsRequirements for micro-copying 1) . 3 Indication on drawings 3.1 Requirements Generally, three different requirements may be defined on technical drawings for the form and size of centre holes, a) centre
28、 hole is required on the finished part; b) centre hole can be accepted on the finished part, but is not a fundamental requirement; c) centre hole shall not exist on the finished part. 3.2 Simplified representation The symbols representing centre holes and their application to the end face of a shaft
29、 are shown in column 2 ofTable 1. 3.3 Designation of centre holes The designation of centre holes is dependent on the drill and may be indicated with reference either to an International Standard or to any other standard dealing with this subject. The designation of the centre hole itself consists o
30、f a reference to this International Standard; the letter for the type (R, A or B); the pilot diameter d; the outside countersink centre hole diameter D. The two values are separated by a solidus. Example: a centre hole 2) , type B with d = 2,5mm and D 3= 8mm may be indicated on the drawing as: ISO64
31、11-B2,5/8 4 Interpretation of indication The relationship between the various designations used to specify the centre holes, the dimensions represented by the given designations, and dimensions depending on the centre drill used are shown inTable 2. Further details specifying the dimensions of the c
32、entre hole, to be indicated preferably on the drawings, are given in Annex A. 1) At present at the stage of draft. 2) For the machining of such a centre hole, a drill with d = 2,5and d 1= 10 according to ISO 2540 is used.EN ISO 6411:1997 2 BSI 05-1999 Table 1 Representation and designation of centre
33、 holes on drawings Dimensions in millimetres Requirement Representation Designation Centre hole is required on the finished part Centre hole may remain on the finished part Centre hole shall not exist on the finished partEN ISO 6411:1997 BSI 05-1999 3 Table 2 Interpretation of the designation Dimens
34、ions in millimetres Type of centre hole Designation(examples) Interpretation of the designation R with radius form (centre drill according to ISO2541) A without protecting chamfer (centre drill according to ISO866) B with protecting chamfer (centre drill according to ISO2540) * For dimension t, see
35、Annex A. * Dimension t depends on the length of the centre drill. It should not be less than t.EN ISO 6411:1997 4 BSI 05-1999 Annex A Dimensions for centre holes type R, A and B The dimensions which are necessary to specify a centre hole are shown inTable 3. Table 3 Dimensions of preferred centre ho
36、les Annex B Proportions and dimensions of symbols In order to harmonize the sizes of the symbols specified in this International Standard with those of the other inscriptions on the drawing (dimensions, tolerances, etc.) the following rules shall be observed. B.1 General requirements B.1.1 The symbo
37、ls shown in the table shall be inscribed with a line thickness (d) equal to 1/10 of the height (h) of the lettering used for the dimensions in the relevant drawing. B.1.2 The numerals and capital letters used for the additional specifications of centre holes shall be inscribed with the same line thi
38、ckness (d), height (h) and type of lettering as used for the dimensions in the relevant drawing, and in accordance with ISO3098/1. B.1.3 The minimum spacing between adjacent lines shall be in accordance with ISO128 or ISO6428. It is recommended that this spacing be not less than0,7mm. B.2 Proportion
39、s The symbol and its complements shown in area a (see B.3) shall be drawn in accordance with the Figure. B.3 Dimensions The range of sizes to be used for the symbols and additional indications is given inTable 4. Table 4 Dimensions, in millimetres Dimensions in millimetres d nom. Type R according to
40、 ISO 2541 A according to ISO 866 B according to ISO 2540 D 1 nom. D 2nom. t ref. D 3 nom. t ref. (0,5) (0,63) (0,8) 1,0 (1,25) 1,6 2,0 2,5 3,15 4,0 (5,0) 6,3 (8,0) 10,0 2,12 2,65 3,35 4,25 5,3 6,7 8,5 10,6 13,2 17,0 21,2 1,06 1,32 1,70 2,12 2,65 3,35 4,25 5,30 6,70 8,50 10,60 13,20 17,00 21,20 0,5 0
41、,6 0,7 0,9 1,1 1,4 1,8 2,2 2,8 3,5 4,4 5,5 7,0 8,7 3,15 4 5 6,3 8 10 12,5 16 18 22,4 28 0,9 1,1 1,4 1,8 2,2 2,8 3,5 4,4 5,5 7,0 8,7 NOTESizes in brackets should be avoided whenever possible. Line thickness for outlines of an item (b) 0,5 0,7 1 1,4 2 2,8 Height of numerals and capital letters (h) 3,5
42、 5 7 10 14 20 Line thickness for symbols (d) 0,35 0,5 0,7 1 1,4 2 Line thickness for lettering (d) seeB.1.2 Height H 1 5 7 10 14 20 28EN ISO 6411:1997 BSI 05-1999 5 Figure BS EN ISO 6411:1997 BS 308-1.23: 1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indepen
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