IS 7485 : Part 1 : 2005 /ISO 7046-1 : 1994 Countersunk Flat Head Screws (Common Head Style) With Type H or Type Z Cross Recess - Product Grade A - Part 1 : Steel of Property Class 4.8

National Foreword

This Indian Standard (Part 1) (Second Revision) which is identical with ISO 7046.1:1 gg4 �Countersunk flat head screws (common head style) with type H or type Z cross recess � Product grade A - Part 1: Steel of property class 4.8� issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of the Bolts, Nuts and Fasteners Accessories Sectional Committee and approval of the Medical Instruments, General and Production Engineering Division Council.

This standard was originally issued in 1974 and revised in 1985. The earlier edition was based on ISO 7046: 1983 �Cross-recessed countersunk flat head screws (common head style) � Product grade A and property class 4:8 only�. This second revision has been revised splitting into two parts harmonizing with ISO 7046-1 :1994 and ISO 7046-2:1990 by adopting them.

Part 1 has been harmonized with ISO 7046-1 : 1994 by adoption to make pace with the latest developments taken place at international level.

Part 2 of this standard covers the screws for steel of property class 8.8, stainless steel and non-ferrous metal.

The text of the ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and 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�.

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.

In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their places are listed below along with their degree of equivalence for the editions indicated: