IS 1364 : Part 4 : 2003 /ISO 4035 : 1999 Hexagon Head Bolts, Screws and Nuts of Product Grades A and B - Part 4 : Hexagon Thin Nuts (Chamfered) (Size Range M1.6 to M64)

NATIONAL FOREWORD

This Indian Standard ( Part 4 ) ( Fourth Revision ) which is identical with ISO 4035:1999 ‘Hexagon thin nuts ( chamfered ) - Product grades A and B’ issued by the International Organization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendation of the Bolts, Nuts and Fasteners Accessories Sectional Committee and approval of the Basic and Production Engineering Division Council.

IS 1364 was originally published in 1960 and first revised in 1967. Subsequent to the publication of 1967 edition, many changes had been agreed upon at international level which have been reflected in IS 1367 series of standards covering ‘Technical supply conditions for threaded steel fasteners’. Accordingly, second revision was published in 1983 splitting the standard into 5 parts covering hexagon head bolts, hexagon head-sc~ews, hexagon nuts, hexagon thin nuts ( chamfered ) and hexagon thin nuts ( unchamfered ),

The third revision of this standard was published in 1992 by adoption of ISO 4035:1988. This fourth revision has been made by adoption of latest version of ISO 4035 published in 1999. The remaining parts of the standard, that is, Part 1, Part 2, Part 3 and Part 5 are also being revised by adopting the corresponding latest editions of ISO Standards published in 1999.

The Committee also decided to publish Indian Standard on ‘Hexagon nuts, Style 2 - Product grades A and B’ as Part 6 of IS 1364. The Part 6 will supersede lS/lSO 4033:1979 on its publication.

In 1967 version of this standard, the width across flat dimensions for Ml O and Ml 2 size fasteners was specified as 17 mm and 19 mm respectively. However, in the 1983 version these widths across flat dimensions were brought in line with ISO 4035:1979 and specified as 16 mm and 18 mm respectively for Ml O and Ml 2 size fasteners. Recognizing the difficulty of immediate changeover to new width across flat dimensions, the Committee decided to permit width across flat dimensions as per 1967 version, that is, 17 mm and 19 mm for M1O and M12 size fasteners till 31 December 1994. Now it is expected that the entire fastener industry would have switched over to new width across flat dimensions and from 1 January 1995 no old width across flat dimensions shall be permitted.

The text of ISO Standard has been approved as suitable for publication as Indian Standard without deviation. Certain terminology and conventions are, however, not identical to those used in the Indian Standards. Attention is drawn especially 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.