IS 13722 : 2025/ISO 8673 : 2023 Hexagon Regular Nuts (Style 1) with Metric Fine Pitch Thread - Product Grades A and B - Specification
Revised Standard from Last Update.
NATIONAL FOREWORD
This Indian Standard (Third Revision) which is identical to ISO 8673 : 2023 'Fasteners - Hexagon regular nuts (style 1), with fine pitch thread' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of General Engineering and Fasteners Standards Sectional Committee and approval of the Production and General Engineering Division Council.
This standard was first published in 1993 and was subsequently revised in 2002 and 2018. This revision has been brought out to align it with ISO 8673 : 2023.
This standard covers the requirements of style 1 hexagon nuts with fine pitch threads. Nuts with fine pitch threads and of style 0 and style 2 are covered separately under IS 13724 : 2025 and IS 13723 : 2025 respectively.
The major changes in this revision are as follows:
a) Nuts with D > 39 mm [with mmin < 0.8D not conforming to IS 1367 (Part 6) nor to IS 1367 (Part 14/Sec 2)] have been shifted to informative Annex A and a reference to ISO/TR 16224 has been added for appropriate nut design;
b) Nuts with dimensions M12×2 and M22×2 have been added;
c) The dimensions da,max, dw,min and mw,min have been specified with two decimal places;
d) For steel nuts, quenching and tempering condition has been specified in accordance with IS 1367 (Part 6);
e) For stainless steel nuts, Grades D4 and D6 and property class 80 have been added;
f) Non-ferrous metal nuts have been deleted (as a consequence of the withdrawal of ISO 8839); and
g) Specification for marking and labelling have been added as 6.
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.