This standard specifies the interchangeable dimensions between the taper end (Type A) of the lathe spindle and the corresponding connecting surface of the faceplate or chuck.
GB/T 5900.1-2008 history
2021GB/T 5900.1-2021 Machine tools—Connecting dimensions of spindle noses and work holding chucks—Part 1: Conical connection
2008GB/T 5900.1-2008 Machine tools.Connecting dimensions of spindle noses adn work holding chucks.Part 1:Conical connection
1997GB/T 5900.1-1997 Machine tools--Spindle noses and face plates--Sizes for interchangeability--Part 1: Type A