Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Fifth Revision) which is identical with ISO 2009 : 2011 ‘Slotted countersunk flat head screws - Product grade A’ issued by the International Organization for Standardization (ISO) has been adopted by the Bureau of Indian Standards on recommendation of the General Engineering and Fasteners Standards Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published in 1962 and subsequently revised in 1966, 1968, 1978 and 2005. The earlier revision was based on ISO 2009 : 1994 ‘Slotted countersunk flat head screws (common head style) - Product grade A’. The fifth revision of this standard has been undertaken to align it with the latest version of ISO 2009 : 2011.

The major changes in this revision are as follows:

a) normative references are updated; and

b) Bibliography has been updated.