IS 7822 : 2024/ISO 3291 : 2016 Extra-Long Morse Taper Shank Twist Drills
NATIONAL FOREWORD
This Indian Standard (Third Revision) which is identical to ISO 3291 : 2016 'Extra-long morse taper shank twist drills' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Cutting Tools Sectional Committee and approval of the Production and General Engineering Division Council.
This standard was originally published in 1975 based on ISO 3291 : 1975 and subsequently revised in 1983 and 2005. This third revision has been brought out to align it with latest version of ISO 3291. In this revision, the relationship between symbols used in this standard and symbols according to ISO 13399 series on 'Cutting tool data representation and exchange' has been added as Annex A.
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain 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'.; and
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.