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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
V-belt and V-ribbed belt drives—Calculation of power ratings
Execute Date: may 2026
Standard published on 31.10.2025
Selected format:Belt drives--Pulleys for V-belts(system based on datum width)--Geometrical inspection of grooves
Standard published on 16.4.2008
Selected format:Belt drives—Geometrical inspection of grooves for classical and narrow V-Pulleys—Part 2System based on effective width
Standard published on 27.11.2023
Selected format:Quality, roughness and balance of transmission pulleys
Standard published on 28.4.2020
Selected format: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:Latest update: 2026-03-18 (Number of items: 2 266 854)
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