This standard specifies the types and dimensions of screw-on lamp caps. This standard applies to the design and production of screw-type lamp caps for electric light sources, and also applies to the design of electric light source products.
GB 1406-2001 history
2008GB/T 1406.1-2008 Types and dimensions of lamp caps.Part 1:Screw caps
2001GB 1406-2001 Types and dimensions of Edison screw lamp caps
GB 1406-2001 Types and dimensions of Edison screw lamp caps was changed to GB/T 1406.1-2008 Types and dimensions of lamp caps.Part 1:Screw caps.