GB/T 5781-2025: Fasteners - Hexagon head bolts - Full thread - Product grade C

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Newer / historical versions: GB/T 5781-2025

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Scope

This document specifies the type, dimensions, technical requirements, marking,
labeling, and designation for fully threaded hexagon head bolts of product grade C.
This document applies to steel hexagon head bolts (hereinafter referred to as "bolts")
with thread sizes of M5 to M64, coarse threads, property classes of 4.6 and 4.8, and
product grade of C.

Basic Data

Standard ID	GB/T 5781-2025 (GB/T5781-2025)
Description (Translated English)	Fasteners - Hexagon head bolts - Full thread - Product grade C
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J13
Classification of International Standard	21.060.10
Word Count Estimation	14,122
Date of Issue	2025-10-31
Date of Implementation	2026-02-01
Older Standard (superseded by this standard)	GB/T 5781-2016
Issuing agency(ies)	State Administration for Market Regulation and Standardization Administration of China