GB/T 702-2026: Steel bars - Dimensions, shape, weight and tolerances

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Scope

This document specifies the classification, cross-sectional shape, cross-sectional dimensions,
weight and permissible deviations, length and permissible deviations, and shape of hot-rolled
steel bars (round steel, square steel, flat steel, hexagonal steel and octagonal steel), forged steel
bars (round steel, square steel and flat steel), and cold-drawn steel bars (round steel, square steel
and hexagonal steel).
This document applies to hot-rolled round steel with a nominal diameter of 5.5 mm to 400 mm
and hot-rolled square steel with a side length of 5.5 mm to 300 mm; general-purpose hot-rolled
flat steel with a thickness of 3 mm to 60 mm and a width of 10 mm to 200 mm; hot-rolled tool
and die steel flat steel with a thickness of 4 mm to 100 mm and a width of 10 mm to 310 mm
(general-purpose hot-rolled flat steel and hot-rolled tool and die steel flat steel are hereinafter
collectively referred to as hot-rolled flat steel); hot-rolled hexagonal steel with an opposite-side
distance of 8 mm to 70 mm and hot-rolled octagonal steel with an opposite-side distance of 16
mm to 40 mm.
This document applies to forged round steel with a nominal diameter of 40 mm to 1,300 mm,
forged square steel with a side length of 40 mm to 1,000 mm, and forged flat steel with a
thickness of 20 mm to 800 mm and a width of 40 mm to 1,500 mm.
This document applies to cold-drawn round steel, square steel, and hexagonal steel with a
nominal dimension of 3 mm to 80 mm.
Corrosion-resistant alloy and high-temperature alloy bars may refer to this document for further
details.

Basic Data

Standard ID	GB/T 702-2026 (GB/T702-2026)
Description (Translated English)	Steel bars - Dimensions, shape, weight and tolerances
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H44
Classification of International Standard	77.140.60
Date of Issue	2026-04-30
Date of Implementation	2026-11-01
Older Standard (superseded by this standard)	GB/T 702-2017, GB/T 908-2019, GB/T 905-1994
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration