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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
Belt drives--Flat transmission belts and corresponding pulleys--Dimensions and tolerances
Standard published on 3.9.1999
Selected format:Synchronous belt drives—Trapezoidal toothed pulleys with pitch code MXL,XXL,XL,L,H,XH and XXH
Standard published on 28.12.2018
Selected format:Synchronous belt drives—Calculation of power rating and drive center distance with belts pitch codes MXLXXLXLLHXH and XXH
Standard published on 21.5.2021
Selected format:Test method of the strength for brazed and soldered joint
Standard published on 6.5.2008
Selected format:Test method of wettability for brazing filler metals
Standard published on 6.5.2008
Selected format:Bevel gears—ISO system of accuracy
Standard published on 18.10.2019
Selected format:Basic terminology of planetary drives
Standard published on 6.5.1989
Selected format:
Basic terminology of planetary drives
Execute Date: may 2026
Standard published on 31.10.2025
Selected format:Measurement of exhaust gas emission for aero-derivative gas tubine
Standard published on 18.7.2008
Selected format:Operation and maintenance for gas turbine
Standard published on 10.4.2008
Selected format:Latest update: 2025-12-28 (Number of items: 2 253 436)
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