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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
Small round nuts
Standard published on 24.6.1988
Selected format:Mounting surfaces of hydraulic valves—Part 2Compensated flow-control valves
Standard published on 31.12.2021
Selected format:Mounting surfaces of hydraulic valves—Part 3: Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves
Standard published on 31.12.2021
Selected format:Hydraulic fluid power--Pressure-relief valves--Mounting surfaces
Standard published on 17.5.2002
Selected format:Pneumatic fluid power—Single rod cylinders,bores from 8 mm to 25 mm—Mounting dimensions
Standard published on 19.11.2020
Selected format:Hydraulic fluid power--Valves--Testing method of flow control valves
Standard published on 23.7.1987
Selected format:Hydraulic fluid power--Valves--Testing method of pressure control valves
Standard published on 23.7.1987
Selected format:Hydraulic fluid power--Valves--Testing method of directional control valves
Standard published on 23.7.1987
Selected format:Hydraulic fluid power-Valves - Determination of pressure differential/flow characteristics
Standard published on 31.12.2012
Selected format:Vehicle electronic sirens
Standard published on 5.12.2014
Selected format:Latest update: 2026-04-30 (Number of items: 2 275 280)
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