BS ISO 00128-24-2014

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BS ISO 00128-24-2014...

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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 It supersedes BS ISO 128-24:1999 which is withdrawn.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



3

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



5

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



11

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



13

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

© ISO 2014 – All rights reserved



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