National foreword

This British Standard reproduces verbatim ISO 128‑50:2001 and implements it as the UK national standard. It partially supersedes BS ISO 128:1982 which will be withdrawn on completion of the overall revision process for ISO 128:1982.

The International Standard, implemented by this British Standard, contains some presentational defects particularly relating to the figures, about which the UK has previously expressed some concerns but not withstanding this, the standard progressed to publication without correction of those defects. It is stressed that these are purely presentational and relate to such things as lettering heights and configuration of arrow heads, in the figures. The technical content of the standard is, however, believed to be correct and it has therefore been decided to implement the standard, unmodified, with the warning that the figures should be considered as illustrations only and that the text be used as the source of definition.

The UK participation in its preparation was entrusted to Technical Committee TDW/4, Engineering drawing, metrology, precision measurement and all related documentation, 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 promulgate them in the UK.

A list of organizations represented on this committee can be obtained on request to its secretary.

Cross-references

The British Standards which implement international publications referred to in this document 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 Electronic 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.

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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this part of ISO 128 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

International Standard ISO 128‑50 was prepared by Technical Committee ISO/TC 10, Technical product documentation, Subcommittee SC 1, Basic conventions.

This first edition of ISO 128‑50 is based on ISO 128:1982, subclauses 4.1 to 4.3 of which it cancels and replaces.

ISO 128 consists of the following parts, under the general title Technical drawings — General principles of presentation:

Part 20: Basic convention 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
The following part is under preparation:
Part 1: Introduction and index

1 Scope

This part of ISO 128 specifies general principles for representing areas on cuts and sections on technical drawings (mechanical, electrical, architectural, civil-engineering etc.) following the orthographic projection methods specified in ISO 5456‑2.

Attention has also been given to the requirements of reproduction, including microcopying in accordance with ISO 6428.

NOTE The basic rules for cuts and sections are given in ISO 128‑40^[1].

2 Normative references

3 Terms and definitions

4 General

5 Hatching

6 Shading or toning

7 Extra-wide continuous outlines

8 Thin sections

9 Thin adjacent sections

10 Specific materials

Bibliography

BS ISO 128-50:2001

Technical drawings. General principles of presentation - Basic conventions for representing areas on cuts and sections

Current, Under Review

Published:

15 Jul 2001