New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 1) (Second Revision) which is identical with ISO 3290-1 : 2014 ‘Rolling bearings — Balls — Part 1: Steel balls’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Bearings Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published in 1965 and subsequently revised in 1976. First revision was identical with ISO 3290 : 1975 ‘Rolling bearings — Bearing parts — Balls for rolling bearings’, issued by the International Organization for Standardization (ISO). The second revision of this standard has been undertaken to align it with the latest version of ISO 3290-1 : 2014.

The major changes in this revision are as follows:

a) normative references are updated;

b) terminology has been updated;

c) hardness requirements are now as agreed upon between customer and supplier; and

d) material specification and load test in particular have been deleted.

This Indian Standard is published in two parts. The other parts in this series is:

Part 2 Ceramic balls

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.