Lathe Accessories Stores: Chuck Adapter, M39 x 4 Thread 6" Dia

Chuck Adapter, M39 x 4 Thread 6" Dia Reviews

Cast iron lathe chuck backplate adapter fits lathes with M39 x 4 spindle nose thread
Adapter is 6" (160 mm) in diameter and has no chuck mounting holes
For all 5" and 6" chucks
Includes instructions for final turning of the registration diameter to insure concentricity

Many 9x20 lathes have this spindle nose. There are no holes in this adapter so you can drill it for either a 3-jaw or 4-jaw chuck.