IS 7461 : 2024/ISO 355 : 2019 Rolling Bearings - Tapered Roller Bearings - Boundary Dimensions and Series Designations
NATIONAL FOREWORD
This Indian Standard (Fourth Revision) which is identical to ISO 355 : 2019 'Rolling bearings - Tapered roller bearings - Boundary dimensions and series designations' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Bearing Sectional Committee and approval of the Production and General Engineering Division Council.
This standard was first published in 1974 and subsequently revised in 1980, 1993 and 2019. First revision was identical to ISO 355 : 1977. Second revision of this standard was identical to ISO 355 :1977, done to incorporate Addendum 1 and Addendum 2 to ISO 355 : 1977. Third revision was identical to ISO 355 : 2007 and superseded IS 7461 (Part 1) : 1993, IS 7461 (Part 2) : 1992 and IS 7461 (Part 3) : 1992. In this revision of this standard has been undertaken to align it with the latest version of ISO 355.
The major changes incorporated in this revision are as follows:
a) Contact angle and smallest single chamfer dimension of the inner ring back face has been added to the double-row bearing tables; and
b) Tables with all dimensions have been added for bearings with flanged outer rings.
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.