Foreword

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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 11, Fasteners with metric external 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 fourth edition cancels and replaces the third edition (ISO 8676:2011), which has been technically revised.

The main changes are as follows:

— tables for dimensions have been entirely restructured, so that the user can find the specified values in a reliable manner (no risk of picking the wrong dimension), see Clause 4 and Annex A;
— the rules for the shortest and greatest standard lengths have been added, and they have been amended accordingly (shortest lengths erroneously published with l_nom = 40 mm in the version of 2011 have been restored for M22×2, M30×2 and M36×3); standard greatest lengths have been limited to 200 mm (longer lengths are to be agreed between the purchaser and the manufacturer);
— for steel screws, property class 5.6 has been deleted and property class 12.9/12.9 has been added;
— for stainless steel screws, grades D4 and D6 and property class 80 have been added;
— non-ferrous metal screws have been deleted;
— 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 8676:2022

Fasteners. Hexagon head screws, with fine pitch thread. Product grades A and B

Current

Published:

31 Aug 2022