ICS 25.060.10                          PGD 32

Reaffirmed 2017

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with ISO 2905:1985 ‘Modular units for machine tool construction - Spindle noses and adjustable adaptors for multi-spindle heads’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Drills, Reamers and Threading Tools Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was first published in 1978 in four parts covering the requirements of short adaptors, long adapters, extra long adaptors and clamping nuts in line with ISO 2905 : 1974. After the revision of corresponding ISO Standard, IS 8919 (Part 1) :1978 ‘Specification for adjustable adaptors for tools with self holding taper shanks: Part 1 Short Adaptors’, IS 8919 (Part 2) :1978 ‘Specification for adjustable adaptors for tools with self holdings taper shanks: Part 2 Long adaptors’, IS 8919 (Part 3) : 1978 ‘Specification for adjustable adaptors for tools with self holdings taper shanks: Part 3 Extra long adaptors’ and IS 8919 (Part 4) : 1978 ‘Specification for adjustable adaptors for tools with self holding taper shanks: Part 4 Clamping nuts’ have been amalgamated in one standard covering all the requirements.

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’.

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.