1、BSI Standards PublicationBS ISO 128-24:2014Technical drawings Generalprinciples of presentationPart 24: Lines on mechanical engineeringdrawingsBS ISO 128-24:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 128-24:2014. Itsupersedes BS ISO 128-24:1999 which
2、is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee TDW/4, Technical Product Realization.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a
3、 contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 72523 4ICS 01.100.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the
4、authority of theStandards Policy and Strategy Committee on 28 February 2014.Amendments issued since publicationDate Text affectedBS ISO 128-24:2014 ISO 2014Technical drawings General principles of presentation Part 24: Lines on mechanical engineering drawingsDessins techniques Principes gnraux de re
5、prsentation Partie 24: Traits utiliss pour les dessins industrielsINTERNATIONAL STANDARDISO128-24Second edition2014-02-15Reference numberISO 128-24:2014(E)BS ISO 128-24:2014ISO 128-24:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise spe
6、cified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or
7、ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 128-24:2014ISO 128-24:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv
8、1 Scope . 12 Normative references 13 General principles . 24 Types of lines and their application . 25 Line widths and line groups . 4Annex A (informative) Examples of application . 5BS ISO 128-24:2014ISO 128-24:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide f
9、ederation 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 established has the right to be represented on that co
10、mmittee. 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 standardization.The procedures used to develop this document
11、and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, P
12、art 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the do
13、cument will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expr
14、essions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 10, Technical product documentation, S
15、ubcommittee SC 6, Mechanical engineering documentation.This second edition cancels and replaces the first edition (ISO 128-24:1999), which has been technically revised.ISO 128 consists of the following parts, under the general title Technical drawings General principles of presentation: Part 1: Intr
16、oduction and index Part 15: Representation of shipbuilding drawings Part 20: Basic conventions for lines Part 21: Preparation of lines by CAD systems Part 22: Basic conventions and applications for leader lines and reference lines Part 23: Lines on construction drawings Part 24: Lines on mechanical
17、engineering drawings Part 25: Lines on shipbuilding drawings Part 30: Basic conventions for views Part 34: Views on mechanical engineering drawings Part 40: Basic conventions for cuts and sections Part 44: Sections on mechanical engineering drawings Part 50: Basic conventions for representing areas
18、on cuts and sectionsiv ISO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E) Part 71: Simplified representation for mechanical engineering drawings TS ISO 2014 All rights reserved vBS ISO 128-24:2014BS ISO 128-24:2014Technical drawings General principles of presentation Part 24: Lines on
19、mechanical engineering drawings1 ScopeThis part of ISO 128 specifies general rules and basic conventions for the types of lines on mechanical engineering drawings.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for
20、 its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 128-20:1996, Technical drawings General principles of presentation Part 20: Basic conventions for linesISO 128-22:1999,
21、 Technical drawings General principles of presentation Part 22: Basic conventions and applications for leader lines and reference linesISO 128-30:2001, Technical drawings General principles of presentation Part 30: Basic conventions for viewsISO 128-40:2001, Technical drawings General principles of
22、presentation Part 40: Basic conventions for cuts and sectionsISO 128-50:2001, Technical drawings General principles of presentation Part 50: Basic conventions for representing areas on cuts and sectionsISO 129-1, Technical drawings Indication of dimensions and tolerances Part 1: General principlesIS
23、O 1101:2012, Geometrical product specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-outISO 2203:1973, Technical drawings Conventional representation of gearsISO 3040:2009, Geometrical product specifications (GPS) Dimensioning and tolerancing ConesISO 5261:
24、1995, Technical drawings Simplified representation of bars and profile sectionsISO 6410-1:1993, Technical drawings Screw threads and threaded parts Part 1: General conventionsISO 6428:1982, Technical drawings Requirements for microcopyingISO 10135:2007, Geometrical product specifications (GPS) Drawi
25、ng indications for moulded parts in technical product documentation (TPD)ISO 10110-1:2006, Optics and photonics Preparation of drawings for optical elements and systems Part 1: GeneralINTERNATIONAL STANDARD ISO 128-24:2014(E) ISO 2014 All rights reserved 1BS ISO 128-24:2014ISO 128-24:2014(E)ISO 1578
26、7:1), Technical product documentation Heat-treated ferrous parts Presentation and indications3 General principlesThe basic types of lines, their designations and dimensions as well as general rules for draughting of lines are specified in ISO 128-20.Requirements for microcopying are specified in ISO
27、 6428.4 Types of lines and their applicationThe first part of the line number in Table 1 is the number of the basic type in accordance with ISO 128-20.Table 1 Types of lines and applicationsNo.Line description and representationApplication Reference 01.1Continuous narrow line.1 imaginary lines of in
28、tersection .2 dimension lines ISO 129-1.3 extension lines ISO 129-1.4 leader lines and reference lines ISO 128-22.5 hatching ISO 128-50.6 outlines of revolved sections ISO 128-40.7 short centre lines .8 root of screw threads ISO 6410-1.9 origin and terminations of dimension lines ISO 129-1.10 diagon
29、als for the indication of flat surfaces .11 bending lines on blanks and processed parts .12 framing of details .13 indication of repetitive details .14 dimensioning and tolerancing lines for cones ISO 3040.15 location of laminations .16 projection lines .17 grid lines Continuous narrow freehand line
30、.18preferably manually represented termination of partial or interrupted views, cuts and sections, if the limit is not a line of symmetry or a centre lineaContinuous narrow line with zigzags.19mechanically represented termination of partial or interrupted views, cuts and sections, if the limit is no
31、t a line of symmetry or a centre lineaaIt is recommended to use only one type of line on one drawing.1) To be published. (Revision of ISO 15787:2001)2 ISO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E)No.Line description and representationApplication Reference 01.2 Continuous wide line
32、 .1 visible edges ISO 128-30.2 visible outlines ISO 128-30.3 crests of screw threads ISO 6410-1.4 limit of length of full depth thread ISO 6410-1.5main representations in diagrams, maps, flow charts.6 system lines (structural metal engineering) ISO 5261.7 parting lines of moulds in views ISO 10135.8
33、direction changes of lines of cuts and section arrowsISO 128-4002.1Dashed narrow line .1 hidden edges ISO 128-30.2 hidden outlines ISO 128-3002.2Dashed wide line.1indication of permissible areas of surface treat-ment, e.g. heat treatmentISO 1578704.1Long-dashed dotted narrow line.1 centre lines .2 l
34、ines and planes of symmetry .3 pitch circle of gears ISO 2203.4 pitch circle of holes .5 indication of expected or wished spread of surface-hardened areas, e.g. heat treatmentISO 15787.6 cutting line ISO 128-4004.2Long-dashed dotted wide line.1 indication of (limited) required areas of surface treat
35、ment, e.g. heat treatment, restricted toler-anced featureISO 15787ISO 1101.2 position of cutting planes ISO 128-4005.1 Long-dashed double-dotted narrow line.1 outlines of adjacent parts .2 extreme positions of movable parts .3 centroidal lines .4 initial outlines prior to forming .5 parts situated i
36、n front of a cutting plane .6 outlines of alternative executions .7 outlines of the finished part within blanks ISO 10135.8 framing of particular fields/areas ISO 15787.9 projected tolerance zone ISO 1101.10 optical axes ISO 10110-1.11 indication of structural outlines used in mechani-cal processesI
37、SO 1578707.2 Dotted wide line .1 indication of areas where heat treatment is not permissibleISO 15787aIt is recommended to use only one type of line on one drawing.Examples of applications are given in Annex A.Table 1 (continued) ISO 2014 All rights reserved 3BS ISO 128-24:2014ISO 128-24:2014(E)5 Li
38、ne widths and line groupsOn mechanical engineering drawings, two line widths are normally used. The proportions between the line widths should be 1:2.The line groups are specified as shown in Table 2.Table 2 Line groupsDimensions in millimetresLine groupLine widthsfor line no.01.2 02.2 04.2 01.1 02.
39、1 04.1 05.10,25 0,25 0,130,35 0,35 0,180,5a0,5 0,250,7a0,7 0,351 1 0,51,4 1,4 0,72 2 1aPreferred line groupsThe widths and groups of lines should be chosen according to the type, size and scale of the drawing and according to the requirements for microcopying and/or other methods of reproduction.4 I
40、SO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E)Annex A (informative) Examples of applicationTable A.1 gives examples of the application of the different types of lines indicating the reference number given in Table 1. The figures are shown in first angle projection. It is understood
41、that third angle projection could be used as well.Table A.1 Examples of application01.1 Continuous narrow line01.1.1 Imaginary lines of intersection01.1.2 Dimension lines01.1.3 Extension lines01.1.4 Leader lines and reference lines01.1.5 Hatching ISO 2014 All rights reserved 5BS ISO 128-24:2014ISO 1
42、28-24:2014(E)01.1.6 Outlines of revolved sections01.1.7 Short centre lines01.1.8 Root of screw threads01.1.9 Origin and terminations of dimension lines01.1.10 Diagonals for the indication of flat surfaces01.1.11 Bending lines on blanks and processed parts01.1.12 Framing of detailsTable A.1 (continue
43、d)6 ISO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E)01.1.13 Indication of repetitive details, e.g. root diameters of gears01.1.14 Dimensioning and tolerancing lines for cones01.1.15 Location of laminations, e.g. transformer plates01.1.16 Projection lines01.1.17 Grid lines01.1.18 Cont
44、inuous narrow freehand linesTable A.1 (continued) ISO 2014 All rights reserved 7BS ISO 128-24:2014ISO 128-24:2014(E)01.1.19 Continuous narrow lines with zigzags01.2 Continuous wide line01.2.1 Visible edges01.2.2 Visible outlines01.2.3 Crests of screw threads01.2.4 Limit of length of full-depth threa
45、d01.2.5 Main representations in diagrams, maps, flow chartsTable A.1 (continued)8 ISO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E)01.2.6 System lines01.2.7 Parting lines of moulds in views01.2.8 Direction changes of lines of cuts and section arrowsTable A.1 (continued) ISO 2014 All r
46、ights reserved 9BS ISO 128-24:2014ISO 128-24:2014(E)02.1 Dashed narrow line02.1.1 Hidden edges02.1.2 Hidden outlines02.2 Dashed wide line02.2.1 Indication of the permissible surface treatment, e.g. heat treatment04.1 Long-dashed dotted narrow line04.1.1 Centre lines04.1.2 Lines and planes of symmetr
47、yTable A.1 (continued)10 ISO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E)04.1.3 Pitch circles of gears04.1.4 Pitch circles of holes04.1.5 Indication of expected or wished spread of surface-hardened areas, e.g. heat treatment04.1.6 Cutting lineTable A.1 (continued) ISO 2014 All rights
48、 reserved 11BS ISO 128-24:2014ISO 128-24:2014(E)04.2 Long-dashed dotted wide line04.2.1 Indication of the limited areas (heat treatment, measuring area, restricted toleranced fea-ture)04.2.2 Position of cutting planes05.1 Long dashed double-dotted narrow line05.1.1 Outlines of adjacent partsTable A.
49、1 (continued)12 ISO 2014 All rights reservedBS ISO 128-24:2014ISO 128-24:2014(E)05.1.2 Extreme positions of movable parts05.1.3 Centroidal lines05.1.4 Initial outlines prior to forming05.1.5 Parts situated in front of a cutting plane05.1.6 Outlines of alternative executionsTable A.1 (continued) ISO 2014 All rights reserved 13BS ISO 128-24:2014ISO 128-24:2014(E)05.1.7 Outlines of the finished part within
