IS 1364 : Part 6 : 2025/ISO 4033 : 2023 Hexagon Head Bolts, Screws and Nuts of Product Grades A and B - Part 6 Hexagon Nuts, Style 2 (Size Range M5 to M39)

ICS 21.060.20

PGD 37

NATIONAL FOREWORD

This Indian Standard (Part 6) (Second Revision) which is identical to ISO 4033 : 2023 'Fasteners - Hexagon high nuts (style 2)' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the General Engineering and Fasteners Standards Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was first published in 2002 and was subsequently revised in 2018. This revision has been brought out to align it with ISO 4033 : 2023. The major changes in this revision are as follows:

a) Sizes M18, M22, M27, M33 and M39 have been added;

b) Minimum height of the washer-face cmin has been added;

c) da,max, dw,min and mw,min have been specified up to two decimal places;

d) dw,min for M5 has been changed from smin - IT16 to smin - IT15 in order to have a larger bearing surface area and thus less contact pressure;

e) For steel nuts, quenching and tempering condition has been specified in accordance with IS 1367 (Part 6), and property class 9 has been deleted;

f) Stainless steel nuts have been added; and

g) Specifications for marking and labelling have been added as 6.

This standard is published in six parts. Other parts in this series are:

Part 1 Hexagon head bolts (size range M1.6 to M64)

Part 2 Hexagon head screws (size range M1.6 to M64)

Part 3 Hexagon nuts, style 1 (size range M1.6 to M64)

Part 4 Hexagon nuts, style 0 (size range M1.6 to M64)

Part 5 Hexagon thin nuts - Product grade B (unhampered) (size range M1.6 to M10)

The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain 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'; and

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.