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1、BRITISH STANDARD BS EN ISO 6433:1995 BS 308-1.8: 1995 Technical drawings Item references The European Standard EN ISO 6433:1994 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6433:1995 This Bri
2、tish Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1995 BSI 01-1999 The following BSI references relate to the work on this standard: Committee reference TDE/4 Draft ann
3、ounced in BSI News August 1995 ISBN 0 580 23775 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee TDE/4, Engineering drawing practice, upon which the following bodies were represented: Atomic Weapons Establishment British
4、 Gas plc British Standards Society Drawing Office Material Manufacturers and Dealers Association Electricity Association Gauge and Tool Makers Association HEVAC Association Institution of Chemical Engineers Institution of Engineering Designers Power Generation Contractors Association Society of Brit
5、ish Aerospace Companies Ltd. University of Warwick Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6433:1995 BSI 01-1999i Contents Page Committees responsibleInside front cov
6、er National forewordii Foreword2 Text of EN ISO 64333 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6433:1995 ii BSI 01-1999 National foreword This British Standard has been prepared by Technic
7、al Committee TDE/4 and is the English language version of EN ISO 6433:1995 Technical drawings Item references, published by the European Committee for Standardization (CEN). It is identical with ISO 6433:1981, published by the International Organization for Standardization (ISO). This British Standa
8、rd partially supersedes BS 308-1. It is envisaged that when the full range of European Standards on technical drawing is implemented BS 308 will be withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for the
9、ir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard ISO 128:1982BS 308 Engineering drawing practice Part 1:1993 Recommendations for general principles ISO 3098-1:1
10、974Part 1:1993 Recommendations for general principles Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This
11、 will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6433 October 1994 ICS 01.100.10 Descriptors: Drawings, graphic meth
12、ods, generalities English version Technical drawings Item references (ISO 6433:1981) Dessins techniques Repres des lments (ISO 6433:1981) Technische Zeichnungen Positionsnummern (ISO 6433:1981) This European Standard was approved by CEN on 1994-10-14. CEN members are bound to comply with the CEN/CEN
13、ELEC 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 references concerning such national standards may be obtained on application to the Central Secretariat or to any
14、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 its own language and notified to the Central Secretariat has the same status as the official versions. CEN
15、 members are the national standards bodies of Austria, Belgium, 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 Euro
16、pisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN ISO 6433:1994 E Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6433:1994 BSI 01-1999 2 Foreword Th
17、is European Standard was taken over by CEN from the work of ISO/TC 10, Technical drawings, product definition and related documentation, of the International Standards Organization (ISO). The Technical Board had decided to submit the final draft for Formal Vote. The result was positive. This Europea
18、n 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 1995, and conflicting national standards shall be withdrawn at the latest by April 1995. According to the CEN/CENELEC Internal Regulations, the following c
19、ountries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword2 1Scope and field of application3 2References3 3
20、General requirements3 4Presentation3 5Example4 Figure 13 Figure 23 Figure 33 Figure 44 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6433:1994 BSI 01-19993 1 Scope and field of application This International Standard gives general r
21、ules for the application and presentation of item references on technical drawings. In the context of this International Standard the purpose of item references is restricted to the identification of component parts of assemblies and/or the identification of individual items detailed on the same dra
22、wing. 2 References ISO 128, Technical drawings General principles of presentation1). ISO 3098/1, Technical drawings Lettering Part 1: Currently used characters. ISO 7573, Technical drawings Item list2). 3 General requirements 3.1 It is recommended that item references be assigned in sequential order
23、 to each component part shown in an assembly and/or each detailed item on the drawing. Identical parts shown in the same assembly shall have the same item reference. Each complete sub-assembly incorporated in the main assembly shown on the drawing can be identified by a single item reference. NOTEIf
24、 the drawing concerns one part only, it is not necessary to assign an item reference, the drawing number being already an adequate means of identifying the part concerned. 3.2 All item references shall be shown in an item list (see ISO 7573) giving the appropriate information on the items concerned.
25、 4 Presentation 4.1 Item references should generally be composed of arabic numerals only. They may, however, be augmented by capital letters when necessary. The design, dimensions and spacing of the characters shall comply with ISO 3098/1. 4.2 All item references on the same drawing shall be of the
26、same type and height of lettering. They must be clearly distinguishable from all other indications. This can be achieved for example by: a) using characters of a larger height, for example twice the height as used for dimensioning and similar indications; b) encircling the characters of each item re
27、ference (see Figure 3); in that case, the circles shall have the same diameter and be drawn with continuous thin lines (type B of ISO 128); c) combining methods a) and b). 4.3 Item references shall be placed outside the general outlines of the items concerned. Each item reference should be connected
28、 to its associated item by a leader line (see Figure 1, Figure 2 and Figure 3), the termination of which shall comply with ISO 128. The leader line may be omitted if the relation between the item reference and its associated item is evident. Leader lines shall not intersect. They should be kept as s
29、hort as practicable and generally they should be drawn at an angle to the item reference. In the case of encircled item references, the leader line shall be directed towards the centre of the circle. 4.4 For the sake of clarity and legibility of the drawing, item references should be arranged prefer
30、ably in vertical columns and/or horizontal rows (see Figure 4). 4.5 Item references of related items may be shown against the same leader line (see Figure 4, items, 8, 9, 10 and 11). 4.6 Item references of identical items need only be shown once, provided that there is no risk of ambiguity. 1) At pr
31、esent at the stage of draft. (Revision of ISO/R 128-1959.) 2) At present at the stage of draft. Figure 1 Figure 2 Figure 3 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6433:1994 4 BSI 01-1999 4.7 A distinct sequence for numbering s
32、hould be adopted: according to the possible order of assembly; according to the importance of the component parts (sub-assemblies, major parts, minor parts, etc.). according to any other logical sequence. 5 Example An example of the application of item references for an assembly is given in Figure 4
33、. Figure 4 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6433:1995 BSI 01-1999 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 04:54:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
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