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B51-14 (R2019) – Boiler, pressure vessel, and pressure piping code

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ISO 7380-3:2026

ISO 7380-3:2026 Fasteners — Button head screws with reduced loadability — Part 3: Hexalobular socket button head screws

CDN $129.00

This publication was last reviewed and confirmed in 2026.

Fasteners — Button head screws with reduced loadability — Part 3: Hexalobular socket button head screws

SKU: 60f66ee5bacb Categories: ,

Description

This document specifies the characteristics of hexalobular socket button head screws 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.

Edition

1

Published Date

2026-06-19

Status

PUBLISHED

Pages

7

Language Detail Icon

English

Format Secure Icon

Secure PDF

Abstract

This document specifies the characteristics of hexalobular socket button head screws 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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