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Cast iron lathe chuck adapter can be threaded to fit any spindle nose thread. It has a 3/8″ smooth pilot hole. This adapter is 4″ (100 mm) in diameter and has no chuck mounting holes. Use it for all 3″ and 4″ chucks.
*NOTE* These adapters require machining on the lathe on which they will be used.
Instructions are included for final turning of the registration diameter on your lathe to ensure perfect concentricity.