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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
Gauges for lamp caps and holders - Part 1 : Gauges for screw caps and holders
Standard published on 29.4.2008
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Gauges for lamp caps and lampholders—Part 1 : Gauges for screw caps and holders
Execute Date: november 2026
Standard published on 30.7.2026
Selected format:Gauges for caps and lampholders - Part 2Gauges for pin caps and lampholders
Standard published on 29.4.2008
Selected format:
Gauges for lamp caps and lampholders—Part 2 : Gauges for pin caps and lampholders
Execute Date: november 2026
Standard published on 30.7.2026
Selected format:Gauges for lamp caps and lampholders - Part 3: Gauges for prefocus caps and lampholders
Standard published on 29.4.2008
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Gauges for lamp caps and lampholders—Part 3 : Gauges for prefocus caps and lampholders
Execute Date: november 2026
Standard published on 30.7.2026
Selected format:Gauges for lamp caps and lampholders - Part 4: Gauges for miscellaneous caps and lampholders
Standard published on 30.9.2009
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Gauges for lamp caps and lampholders—Part 4 : Gauges for miscellaneous caps and lampholders
Execute Date: november 2026
Standard published on 30.7.2026
Selected format:Gauges for caps and lampholders - Part 5:Gauges for bayonet caps and lampholders
Standard published on 18.6.2008
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Gauges for lamp caps and lampholders—Part 5Gauges for bayonet caps and lampholders
Execute Date: november 2026
Standard published on 30.7.2026
Selected format:Latest update: 2026-09-09 (Number of items: 2 300 143)
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