Reaffirmed 2023

NATIONAL FOREWORD

This Indian Standard (Second Revision) which is identical with ISO 369 : 2009 ‘Machine tools — Symbols for indications appearing on machine tools’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Machine Tools, Machine Tool Elements and Holding Devices Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published in 1962 and subsequently revised in 1993. Its first publication was based on ISO Recommendation No. 481 : 1961 ‘Symbols on machine tool indicator plates’. Consequent after gaining experience, the first revision was taken up by including many other symbols and modifying the then existing symbols so as those could be easily understood by the workmen by aligning with BS 3641 (Part 1) : 1971 ‘Symbols for machine tools — Part 1: General symbols’ and BS 3641 (Part 3) : 1973 ‘Symbols for machine tools — Part 3: Additional general symbols’; issued by British Standard Institution (BSl). In the first revision, considerable assistance was also taken from lSO/R-369 : 1964 issued by International Organization for Standardization (ISO).

The committee has now decided to adopt this standard under dual numbering system in order to unify the symbols and align it with the latest version of ISO 369 : 2009 so that differences, if any in indication with that used in other countries could be avoided.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.