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GB/T 70.4-2025Fasteners - Hexagon socket screw - Part 4: Hexagon socket button head screws with collar and reduced loadability (English PDF)

紧固件内六角螺钉第4部分：降低承载能力内六角平圆头凸缘螺钉

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Also coversGB/T70.4-2025 + GBT70.4-2025

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

February 1, 2026

Scope

GB/T 70.4-2025 is the English-translated version of 紧固件内六角螺钉第4部分：降低承载能力内六角平圆头凸缘螺钉.

This standard is Part 4 of the series on hexagon socket screws and concerns hexagon socket button head screws with collar and reduced loadability. The collar is the flange under the head, and the reduced loadability designation indicates a lower load rating than that of the standard head form. It is a recommended national standard.

Fastener makers, stockists, design engineers, assembly plants and procurement teams can use it to describe and order this screw type. Quality inspectors and importers who handle Chinese-made fasteners will find a clear product reference helpful when checking incoming goods against drawings.

It was issued on 31 October 2025 and took effect on 1 February 2026, so it is now in force. It replaces GB/T 70.4-2015, and organisations that quote the earlier edition in specifications or catalogues should update their references.

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Document preview — GB/T 70.4-2025

National Standard of the People's Republic of China

ICS: 21.060.10
Classification: J13
Replacing: GB/T 70.4-2015

Issued by: State Administration for Market Regulation; Standardization Administration of China

Foreword
1 Scope
2 Normative references
3 Terms and definitions

Foreword

GB/T 70.4-2025 is a recommended national standard (GB/T) of the People's Republic of China, issued on 31 October 2025 by the State Administration for Market Regulation and the Standardization Administration of China, with effect from 1 February 2026.

This edition replaces GB/T 70.4-2015.

The document adopts an international standard (ISO or IEC).

It is under the responsibility of the China Machinery Industry Federation.

Classification: ICS 21.060.10; CCS J13.

1 Scope

Remaining clauses in the full document

2 Normative references
3 Terms and definitions

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Cited by

GB/T 3836.1-2021Explosive atmospheres - Part 1: Equipment - General requirements

Similar standards

GB/T 70.2-2025

Editions of GB/T 70.4

Edition	Title	Revision	Status
GB/T 70.4-2025	Fasteners - Hexagon socket screw - Part 4: Hexagon socket button head screws with collar and reduced loadability	current edition	Current
GB/T 70.4-2015	Hexagon socket button head screws with collar	previous edition	In force until 1 February 2026

This page sells the current edition, GB/T 70.4-2025. Earlier editions are listed for reference only.

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