IS 13099 : 2024/ISO 5458 : 2018 Geometrical Product Specifications (GPS) - Geometrical Tolerancing - Pattern and Combined Geometrical Specification
NATIONAL FOREWORD
This Indian Standard (Second Revision) which is identical to ISO 5458 : 2018 'Geometrical product specifications (GPS) - Geometrical tolerancing - Pattern and combined geometrical specification' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Drawings Sectional Committee and approval of the Production and General Engineering Division Council.
This standard was first published in 1991 and subsequently revised in 2001. The original standard was based on ISO 5458 : 1987. First revision of this standard was identical with ISO 5458 : 1998. The second revision of this standard has been undertaken to align it with the latest version of ISO 5458.
The major changes in this revision are as follows:
a) Exception from the independency principle removed according to ISO 8015;
b) Rules harmonized to align with ISO 1101;
c) Unstated rules in ISO 5458 : 1998 removed; and
d) Concept of 'pattern' to control all types of geometrical features introduced more generically, rather than applying it only with position symbol.
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.