British Standards Institution

Source:: ISO
Committee:: FME/9 - Fasteners
Categories:: Bolts, screws, studs
Comment period start date:: 02/04/2025
Comment period end date:: 18/05/2025
Number of comments:: 1

Comment by:

18th May

Scope

This document specifies the characteristics of hexalobular socket button head screws with collar with reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M3 to M12, and with product grade A.

If, in certain cases, other specifications are requested, property classes and stainless steel grades can be selected from ISO 898‑1 or ISO 3506-1, and the dimensional options from ISO 888 or ISO 4753.

NOTE The reduced loadability (related to the head dimensions in combination with penetration of the hexalobular socket specified in this document) implies a limitation of ultimate tensile load shown by a specific marking (property class preceded by a zero). The loadability in the head is assumed to be 80 % of that in the thread for all sizes and all property classes, see Table 4.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal (Complete)

Proposal start date:

2. Draft (Complete)

Draft start date:

03/01/2025

3. Public Comments

Public Comments start date:

02/04/2025

Public Comments end date:

18/05/2025

Learn more about the standards development process

Standards Development

BS EN ISO 7380-4 ISO 7380-4 Fasteners. Button head screws with reduced loadability. Part 4: Hexalobular socket button head screws with collar

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