[Superseding IS 11173 (Part 2) : 1985]

Reaffirmed 2018

NATIONAL FOREWORD

This Indian Standard (Part 3) which is identical with ISO 7388-3 : 2007 ‘Tool shanks with 7/24 taper for automatic tool changers — Part 3: Retention knobs for shanks of forms AC, AD, AF, UC, UD, UF, JD and JF’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Cutting Tools Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published as IS 11173 in 1985 in two parts as ‘Recommendations for tool shanks 7/24 taper for numerically controlled machine tools with automatic tool changers (tool rotating type): Part 1 Tool shanks and Part 2 Retention knobs’ by deriving considerable assistance from ISO 7388-1 : 1983 and ISO 7388-2 : 1984 ‘Tool shanks with 7/24 taper for automatic tool changers — Part 1: Shanks of 40-45 and 50 dimensions’ and Part 2: Retention knobs for shank No. 40, 45 and 50 dimensions and mechanical characteristics’.

Now, the technical committee has considered adopting all the three parts of ISO 7388 in a single number as IS/ISO. Accordingly, both the parts of IS 11173 stand withdrawn. After the publication of this standard IS 11173 (Part 2) : 1985 ‘Recommendations for tool shanks 7/24 for numerically controlled machine tools with automatic tool changers (tool rotating type): Part 2 Retention knobs’ shall be treated as withdrawn.

This standard is published in three parts. Other parts in this series are:

Part 1 Dimensions and designation of shanks of forms A, AD, AF, U, UD and UF

Part 2 Dimensions and designation of shanks of forms J, JD and JF

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology 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.