IS 1821 : 1987/ISO 273 : 1979 Dimensions for clearance holes for bolts and screws

National Foreword

This Indian Standard which is identical with ISO 273-1979`Fasteners - Clearance holes for bolts and screws `issued by theInternational Organization for Standardization (ISO), was adoptedby the Indian Standards Institution on the recommendation of theBolts, Nuts and Fasteners Accessories Sectional Committee andapproval of the Mechanical Engineering Division Council.

The original version of this standard was published in 1961 andrevised in 1967 and 1982. The present revision of the standard hasbeen made by adoption of ISO 273-1979 to bring it in line with ISOstandard.