BS ISO 128-24:2014
BSI Standards Publication
Technical drawings — General principles of presentation Part 24: Lines on mechanical engineering drawings
BS ISO 128-24:2014
BRITISH STANDARD
National foreword This British Standard is the UK implementation of ISO 128-24:2014. It supersedes BS ISO 128-24:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee TDW/4, Technical Product Realization. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 72523 4 ICS 01.100.20 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2014. Amendments issued since publication Date
Text affected
INTERNATIONAL STANDARD
BS ISO 128-24:2014
ISO 128-24 Second edition 2014-02-15
Technical drawings — General principles of presentation — Part 24: Lines on mechanical engineering drawings Dessins techniques — Principes généraux de représentation — Partie 24: Traits utilisés pour les dessins industriels
Reference number ISO 128-24:2014(E) © ISO 2014
BS ISO 128-24:2014
ISO 128-24:2014(E)
COPYRIGHT PROTECTED DOCUMENT © ISO 2014 All rights reserved. Unless otherwise specified, 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 ISO’s member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail
[email protected] Web www.iso.org Published in Switzerland
ii
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E)
Contents
Page
Foreword......................................................................................................................................................................................................................................... iv
1 Scope.................................................................................................................................................................................................................................. 1 2 3 4 5
Normative references....................................................................................................................................................................................... 1 General principles................................................................................................................................................................................................ 2 Types of lines and their application.................................................................................................................................................. 2 Line widths and line groups...................................................................................................................................................................... 4
Annex A (informative) Examples of application........................................................................................................................................ 5
© ISO 2014 – All rights reserved
iii
BS ISO 128-24:2014
ISO 128-24:2014(E)
Foreword ISO (the International Organization for Standardization) is a worldwide federation 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 committee. 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 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, Part 2. www.iso.org/directives
Attention 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 document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patents Any 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 expressions related to conformity assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 10, Technical product documentation, Subcommittee 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: Introduction 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 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 on cuts and sections iv
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) — Part 71: Simplified representation for mechanical engineering drawings [TS]
© ISO 2014 – All rights reserved
v
BS ISO 128-24:2014
BS ISO 128-24:2014
INTERNATIONAL STANDARD
ISO 128-24:2014(E)
Technical drawings — General principles of presentation — Part 24: Lines on mechanical engineering drawings 1 Scope
This part of ISO 128 specifies general rules and basic conventions for the types of lines on mechanical engineering drawings.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for 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 lines ISO 128-22:1999, Technical drawings — General principles of presentation — Part 22: Basic conventions and applications for leader lines and reference lines
ISO 128-30:2001, Technical drawings — General principles of presentation — Part 30: Basic conventions for views ISO 128-40:2001, Technical drawings — General principles of presentation — Part 40: Basic conventions for cuts and sections
ISO 128-50:2001, Technical drawings — General principles of presentation — Part 50: Basic conventions for representing areas on cuts and sections ISO 129-1, Technical drawings — Indication of dimensions and tolerances — Part 1: General principles
ISO 1101:2012, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form, orientation, location and run-out ISO 2203:1973, Technical drawings — Conventional representation of gears
ISO 3040:2009, Geometrical product specifications (GPS) — Dimensioning and tolerancing — Cones ISO 5261:1995, Technical drawings — Simplified representation of bars and profile sections
ISO 6410-1:1993, Technical drawings — Screw threads and threaded parts — Part 1: General conventions ISO 6428:1982, Technical drawings — Requirements for microcopying
ISO 10135:2007, Geometrical product specifications (GPS) — Drawing 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: General
© ISO 2014 – All rights reserved
1
BS ISO 128-24:2014
ISO 128-24:2014(E)
ISO 15787:—1), Technical product documentation — Heat-treated ferrous parts — Presentation and indications
3 General principles The 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 6428.
4 Types of lines and their application
The 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 applications
No.
Line description and representation
Application .1
imaginary lines of intersection
.4
leader lines and reference lines
.2
.3 .5 .6
Continuous narrow line
.7
.8 .9
.10
.11
01.1
.12 .13 .14
.15
Continuous narrow freehand line
a
.16 .17
.18
Continuous narrow line with zigzags .19
—
dimension lines
ISO 129-1
extension lines
ISO 129-1
ISO 128-22
hatching
ISO 128-50
outlines of revolved sections
ISO 128-40
short centre lines
root of screw threads
origin and terminations of dimension lines
diagonals for the indication of flat surfaces
bending lines on blanks and processed parts framing of details
indication of repetitive details
dimensioning and tolerancing lines for cones location of laminations projection lines grid lines
preferably manually represented termination of partial or interrupted views, cuts and sections, if the limit is not a line of symmetry or a centre linea mechanically represented termination of partial or interrupted views, cuts and sections, if the limit is not a line of symmetry or a centre linea
It is recommended to use only one type of line on one drawing.
1) To be published. (Revision of ISO 15787:2001)
2
Reference
—
ISO 6410-1 ISO 129-1 —
—
—
—
ISO 3040 —
—
—
— —
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) Table 1 (continued) No. 01.2
Line description and representation Continuous wide line
Application .1
visible edges
ISO 128-30
.4
limit of length of full depth thread
ISO 6410-1
.2
.3 .5 .6 .7
02.1
02.2
Dashed narrow line Dashed wide line
Long-dashed dotted narrow line
04.1
04.2 05.1
.8
parting lines of moulds in views
direction changes of lines of cuts and section arrows
.2
lines and planes of symmetry
.1
.3
.6
hidden outlines
centre lines
pitch circle of gears pitch circle of holes
indication of expected or wished spread of surface-hardened areas, e.g. heat treatment
ISO 128-30 ISO 6410-1 —
ISO 5261
ISO 10135
ISO 128-40 ISO 128-30
ISO 128-30 ISO 15787 —
—
ISO 2203 —
ISO 15787
cutting line
ISO 128-40
.2
position of cutting planes
ISO 128-40
.3
centroidal lines
.1 .1
.2
.6 .7
.8 .9
.10
a
system lines (structural metal engineering)
indication of permissible areas of surface treatment, e.g. heat treatment
.5
Dotted wide line
main representations in diagrams, maps, flow charts
.1
.2
.4
07.2
crests of screw threads
hidden edges
.5
Long-dashed doubledotted narrow line
visible outlines
.1
.4
Long-dashed dotted wide line
Reference
.11
.1
indication of (limited) required areas of surface treatment, e.g. heat treatment, restricted toleranced feature outlines of adjacent parts
extreme positions of movable parts initial outlines prior to forming
parts situated in front of a cutting plane outlines of alternative executions
outlines of the finished part within blanks framing of particular fields/areas projected tolerance zone optical axes
indication of structural outlines used in mechanical processes
indication of areas where heat treatment is not permissible
It is recommended to use only one type of line on one drawing.
ISO 15787 ISO 1101 —
—
—
—
—
—
ISO 10135
ISO 15787 ISO 1101
ISO 10110-1 ISO 15787
ISO 15787
Examples of applications are given in Annex A. © ISO 2014 – All rights reserved
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BS ISO 128-24:2014
ISO 128-24:2014(E)
5 Line widths and line groups On 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 groups Line widths
Line group 0,25
0,35 0,5a 0,7a 1
a
1,4 2
Preferred line groups
01.2 – 02.2 – 04.2 0,25
0,35 0,5
for line no.
Dimensions in millimetres 01.1 – 02.1 – 04.1 – 05.1 0,13 0,18
0,25
0,7
0,35
2
1
1
1,4
0,5 0,7
The 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
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E)
Annex A (informative)
Examples of application Table 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 that third angle projection could be used as well. Table A.1 — Examples of application
01.1
Continuous narrow line
01.1.1
Imaginary lines of intersection
01.1.2
Dimension lines
01.1.3
Extension lines
01.1.4
Leader lines and reference lines
01.1.5
Hatching
© ISO 2014 – All rights reserved
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BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 01.1.6
Outlines of revolved sections
01.1.7
Short centre lines
01.1.8
Root of screw threads
01.1.9
Origin and terminations of dimension lines
01.1.10
Diagonals for the indication of flat surfaces
01.1.11
Bending lines on blanks and processed parts
01.1.12
Framing of details
6
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 01.1.13
Indication of repetitive details, e.g. root diameters of gears
01.1.14
Dimensioning and tolerancing lines for cones
01.1.15
Location of laminations, e.g. transformer plates
01.1.16
Projection lines
01.1.17
Grid lines
01.1.18
Continuous narrow freehand lines
© ISO 2014 – All rights reserved
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BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 01.1.19
01.2
Continuous narrow lines with zigzags
Continuous wide line
01.2.1
Visible edges
01.2.2
Visible outlines
01.2.3
Crests of screw threads
01.2.4
Limit of length of full-depth thread
01.2.5
Main representations in diagrams, maps, flow charts
8
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 01.2.6
System lines
01.2.7
Parting lines of moulds in views
01.2.8
Direction changes of lines of cuts and section arrows
© ISO 2014 – All rights reserved
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BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 02.1
Dashed narrow line
02.1.1
Hidden edges
02.1.2
Hidden outlines
02.2 02.2.1
04.1
Dashed wide line Indication of the permissible surface treatment, e.g. heat treatment
Long-dashed dotted narrow line
04.1.1
Centre lines
04.1.2
Lines and planes of symmetry
10
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 04.1.3
Pitch circles of gears
04.1.4
Pitch circles of holes
04.1.5
Indication of expected or wished spread of surface-hardened areas, e.g. heat treatment
04.1.6
Cutting line
© ISO 2014 – All rights reserved
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BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 04.2
Long-dashed dotted wide line
04.2.1
Indication of the limited areas (heat treatment, measuring area, restricted toleranced feature)
04.2.2
Position of cutting planes
05.1 05.1.1
12
Long dashed double-dotted narrow line Outlines of adjacent parts
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 05.1.2
Extreme positions of movable parts
05.1.3
Centroidal lines
05.1.4
Initial outlines prior to forming
05.1.5
Parts situated in front of a cutting plane
05.1.6
Outlines of alternative executions
© ISO 2014 – All rights reserved
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BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 05.1.7
Outlines of the finished part within blanks
05.1.8
Framings of particular fields/areas
05.1.9
Projected tolerance zone
05.1.10
Optical axis
05.1.11
Indication of structural outlines used in mechanical processes
14
© ISO 2014 – All rights reserved
BS ISO 128-24:2014
ISO 128-24:2014(E) Table A.1 (continued) 07.2
Dotted wide line
07.2
© ISO 2014 – All rights reserved
Indication of areas where heat treatment is not permissible
15
BS ISO 128-24:2014
ISO 128-24:2014(E)
ICS 01.100.20 Price based on 15 pages
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