This standard specifies the types and dimensions of Morse taper shank end mills. This standard applies to end mills with a Morse taper shank with a diameter greater than 5 to 75 mm.
GB/T 6117.2-1996 history
2010GB/T 6117.2-2010 End mills.Part 2:Milling cutters with Morse taper shanks
1996GB/T 6117.2-1996 End mills--Part 2: Milling cutters with Morse taper shanks