IS 2269 : 2006 /ISO 4762 : 2004 Hexagon Socket Head Cap Screws

National Foreword

This Indian Standard (Fifth Revision) which is identical with ISO 4762 : 2004 ?Hexagon socket head capscrews? issued by the International Organization for Standardization (ISO) was adopted by the Bureauof Indian Standards on the recommendation of the Bolts, Nuts and Fasteners Accessories SectionalCommittee and approval of the Medical Instruments, General and Production Engineering Division Council.

This standard was originally published in 1963 and subsequently revised in 1967,1981, 1995 and 2002.The fourth revision was harmonized with ISO 4762 : 1997 by adopting under dual number. Consequentupon the revision of ISO 4762 in 2003, the Sectional Committee decided to revise this Indian Standardto align it with ISO 4762 : 2003 by adoption under dual number.

In this revision the following major changes have made:

a)The details of ?Gauging of hexagon socket? have been deleted as a separate IndianStandard will be formulated on ?Gauging of hexagon socket? reference of which is given inthis standard.

b)Figure 1 has been technically revised.

c)The maximum value of s^f (see Table 1) for sizes up to M 16 has been made applicable to allproperty classes.

d)The hardness requirement for screws unsuitable for tensile strength has been deleted fromTable 2.

e)?Black oxide finish? (thermal or chemical) has been replaced by ?As processed finish?.

f)The provision of non-electrolytically applied zinc flake coatings have been made.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard withoutdeviations. Certain terminology and conventions are, however, not identical to those used in IndianStandards. Attention is drawn especially to the following:

a) Wherever the words ?International Standard? appear referring to this standard, they shouldbe read as ?Indian Standard?.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the currentpractice is to use a point (.) as the decimal marker.

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