National foreword

This British Standard is the UK implementation of ISO 15786:2008.

The UK participation in its preparation was entrusted to Technical Committee TDW/4, Technical product realization (TPR).

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.

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 31 May 2009

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 2.

The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 15786 was prepared by Technical Committee ISO/TC 10, Technical product documentation, Subcommittee SC 6, Mechanical engineering documentation.

Introduction

This International Standard has been established to specify the simplified representation and dimensioning of holes.

The rules established by this International Standard determine, unambiguously, methods for the representation - both complete and simplified - and the dimensioning of holes, as well as the structure and sequence of the descriptive elements for the simplified representation of holes.

1 Scope

This International Standard specifies rules for the simplified representation, dimensioning and tolerancing of holes, counterbores, internal threads and chamfers on drawings.

Where there could be misinterpretation using simplified representation, the complete representation and dimensioning by cuts, sections or elements on a larger scale apply, according to ISO 128‑30, ISO 128‑34, ISO 128‑40, ISO 128‑44, ISO 128‑50, ISO 129‑1 and ISO 406.

2 Normative references

3 Terms and definitions

4 Methods of representation and dimensioning of holes

4.1 Complete representation and complete dimensioning of holes

4.2 Complete representation and simplified dimensioning of holes

4.3 Simplified representation and simplified dimensioning of holes

4.4 Representation of holes on the same drawing

5 Structure of dimensioning of holes

5.1 Structure and sequence of descriptive elements for simplified dimensioning of holes

5.2 Graphical symbols

5.3 Number of groups of holes and number of holes in a group

5.4 Indication of tolerances

5.5 Hole bottom

5.6 Countersinks and chamfers

5.7 Depth dimensions

5.8 Indication of surface texture

5.9 Indication of dimensions on geometrical tolerances

Bibliography

BS ISO 15786:2008

Technical drawings. Simplified representation and dimensioning of holes

Current

Published:

31 May 2009