Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

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This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 13, Fasteners with non-metric thread, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 185, Threaded and nonthreaded mechanical fasteners and accessories, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 2702:2011), which has been technically revised.

The main changes are as follows:

— document newly structured with regard to requirements and test methods;
— new Table 1 for mechanical and physical properties and related test methods (see 5.1);
— maximum case-hardened depth increased to 0,12 mm for ST2,2 and ST2,6 (see 5.3);
— maximum core hardness changed from 370 HV back to 390 HV and core hardness test specified more precisely (see 5.4 and 6.4);
— new clauses for ductility and ductility test added (see 5.8 and 6.8);
— test method for case-hardened depth determination modified (see 6.3);
— torsional test specified more precisely (see 6.7);
— new Clause 7 for inspection added;
— new Clause 8 for marking and labelling added.

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 2702:2022

Fasteners. Heat treated tapping screws. Mechanical and physical properties

Current

Published:

31 Jan 2023