IS 5692 : 2024/ISO 492 : 2023 Rolling Bearings — Radial Bearings — Geometrical Product Specifications (GPS) and Tolerance Values
NATIONAL FOREWORD
This Indian Standard (Third Revision) which is identical to ISO 492 : 2023 ‘Rolling bearings — Radial bearings — Geometrical product specifications (GPS) and tolerance values’ 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 1970 and subsequently revised in 1988 and 2019. First revision was identical to ISO 492 : 1986. Second revision of this standard was identical to ISO 492 : 2014 ‘Rolling bearings — Radial bearings — Tolerances’, issued by the International Organization for Standardization (ISO) and superseded IS 7460 : 1988 incorporating all its content. In this revision ofthis standard has been undertaken to align it with the latest version of ISO 492.
The major changes incorporated in this revision are as follows:
a)Symbols and the symbols list have been amended, such as symbols for width of asymmetricrings and assembled bearing;
b)Changes have been made to the geometrical product specifications (GPS) system, such as theindication of Kia and Kea;
c)Deviation limits and tolerance values towards larger bore diameter and outside bearingdiameters in Tables 4 to 26 have been extended;
d)Annexes A, B, C and D have been deleted; and
e)The stiffness series of tapered roller bearings and background information regarding affectedtolerance values have been added in new Annexes A and B.
The text of ISO standard has been approved as suitable for publication as an Indian Standard withoutdeviations. 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 beread as ‘Indian Standard’; and
b)Comma (,) has been used as a decimal marker while in Indian Standards, the current practice isto use a point (.) as the decimal marker.