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 third edition cancels and replaces the second edition (ISO 10512:2012) which has been technically revised.

The main changes are as follows:

— the design principles of these nuts have been clarified in Scope (see Note);
— style, relevant property classes and related quenching and tempering conditions for steel nuts have been specified in Clause 5 in accordance with ISO 898-2, and property class 6 has been deleted (see Table 3);
— stainless steel nuts have been added in accordance with ISO 3506-2;
— M20×2 has been added, as well as non-preferred sizes 18 mm, 22 mm, 27 mm, 33 mm and 39 mm;
— d _a,max has been specified with two decimal places;
— h _max for size 20 mm has been increased so that regular, high and thin nuts have an identical room for the prevailing torque feature (h_max – m_min) to accommodate the non-metallic insert; h_min has therefore been increased in accordance with the specified tolerance (see Table 2);
— 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.

ISO 10512:2025

Fasteners. Prevailing torque hexagon nuts. Regular nuts (with non-metallic insert), with fine pitch thread

Current

Published:

13 Jun 2025