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Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
Cotton yarn--Packing and marking
WITHDRAWN published on 20.6.1978
Selected format:Casing diameters for round movements
WITHDRAWN published on 1.1.1983
Selected format:Dimensions of clutch wheel hole for wristwatch
WITHDRAWN published on 1.1.1983
Selected format:Assembling dimensions for wrist watch crown tube
WITHDRAWN published on 1.1.1983
Selected format:Assembling dimensions for wrist watch stem
WITHDRAWN published on 1.1.1983
Selected format:Dimensions for wrist watch crown
WITHDRAWN published on 1.1.1983
Selected format:Dimensions for wrist watch back with threads
WITHDRAWN published on 1.1.1983
Selected format:A series of diameter for the dial foot of watches
WITHDRAWN published on 1.1.1983
Selected format:Dimensions of round glass for watch cases
WITHDRAWN published on 1.1.1983
Selected format:Wristwatch cases--Dimensions of fastening elements for bracelets
WITHDRAWN published on 17.12.1983
Selected format:Latest update: 2025-11-11 (Number of items: 2 243 547)
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