This part specifies the interchangeable dimensions between the conical end (type A) of the lathe spindle and the corresponding connecting surface of the faceplate or chuck. This part applies to ordinary lathes, CNC lathes, and other machine tools can also be used as a reference. 2 Interchangeability
GB/T 5900.1-2021 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