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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
Flared couplings - Straight thread run tee
Standard published on 7.5.2008
Selected format:Flared couplings - Swivel branch tee
Standard published on 7.5.2008
Selected format:Flared couplings - Union tee
Standard published on 7.5.2008
Selected format:Flared couplings - Union cross
Standard published on 7.5.2008
Selected format:Flared couplings - Weld male
Standard published on 7.5.2008
Selected format:Flared couplings - Bulkhead union
Standard published on 7.5.2008
Selected format:Flared couplings - Bulkhead union elbow
Standard published on 7.5.2008
Selected format:Flared couplings - Connector for pressure gauge
Standard published on 7.5.2008
Selected format:Flared couplings - Sleeve
Standard published on 7.5.2008
Selected format:Flared couplings - Style A nut
Standard published on 7.5.2008
Selected format:Latest update: 2026-06-26 (Number of items: 2 284 409)
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