Foreword

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This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 185, Fasteners,in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fifth edition cancels and replaces the fourth edition (ISO 4032:2012) which has been technically revised.

The main changes are as follows:

— nuts with D < M5 and D > M39 (with m_min < 0,8D not conforming to ISO 898‑2 nor to ISO 3506‑2) have been shifted to informative Annex A; reference to ISO/TR 16224 for appropriate nut design has been added;
— M7 has been added;
— values of c_max for sizes M1,6 to M2,5 have been amended in accordance with ISO 4759‑1;
— d _a,max, d_w,min and m_w,min have been specified with two decimal places;
— d _w,min for sizes D ≤ M5 has been changed from s_min – IT16 to s_min – IT15 in order to have a larger bearing surface area and thus less contact pressure;
— for steel nuts, quenching and tempering condition has been specified in accordance with ISO 898‑2, and property classes 5 and 12 have been added;
— for stainless steel nuts, grades D4 and D6 and property class 80 have been added;
— non-ferrous metal nuts have been deleted (as a consequence of the withdrawal of ISO 8839);
— specifications for marking and labelling have been added as Clause 6.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

BS EN ISO 4032:2023

Fasteners. Hexagon regular nuts (style 1)

Current

Published:

31 Aug 2023