Foreword

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This document was prepared by Technical Committee ISO/TC 2, Fasteners, 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 8747:1997) which has been technically revised.

The main changes are as follows:

— terms and definitions, principles for grooved pins and assembly (including hole dimensions), control of the expanded diameter d₂ and pin straightness, mechanical and physical properties (including shear resistance and hardness) and inspection which are common for all grooved pins (product standards ISO 8739 to ISO 8747, ISO 13670 and ISO 13672) have been specified in the new reference standard ISO 13669 dealing with general requirements;
— nominal sizes 1,4 mm and 1,6 mm have been deleted;
— the symbols for the pilot point (PL instead of B) and optional chamfer point (CH instead of A) have been amended analogously to ISO 4753; the length of the points has been specified as a minimum value;
— the head diameters d_k have been recalculated and rounded to the nearest 0,05 mm for pins with nominal sizes up to 8 mm; d_k,max has been recalculated for pins with nominal sizes 16 mm and 20 mm;
— the head height k has been added as a reference dimension;
— the maximum distance between the underhead bearing surface and the beginning of the grooves l_k has been added;
— stainless steel grades A2, A4, C1 and F1 have been added;
— other materials (such as hardened steels, brass, aluminium) are by agreement (see Table 3);
— specifications for labelling have been added as Clause 8.

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 8747:2025

Fasteners. Grooved pins with countersunk head. Full-length diamond grooves

Current

Published:

31 Mar 2025