GB/T 31879-2026: Road vehicles - Fifth wheel

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Scope

This Document specifies the classification and models, technical requirements, test methods,
inspection rules, marking, accompanying documentation, transportation, and storage of the fifth
wheel.
This Document applies to the design, production, and inspection of No. 50 and No. 90 fifth
wheels that connect to the traction pins specified in GB/T 4606 and GB/T 4607, respectively.

Basic Data

Standard ID	GB/T 31879-2026 (GB/T31879-2026)
Description (Translated English)	Road vehicles - Fifth wheel
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	T71
Classification of International Standard	43.080.10
Word Count Estimation	14,173
Date of Issue	2026-01-28
Date of Implementation	2026-08-01
Older Standard (superseded by this standard)	GB/T 31879-2015
Issuing agency(ies)	State Administration for Market Regulation, Standardization Administration of China