A2-4 6000RPM, OD 150mm, belt drive lathe turning spindle with three jaws chuck
Royal Products - 1-3/4″ Max Capacity A2-5 Spindle 3J Lathe Collet Chuck - 77877520 - MSC Industrial Supply
Lathe Spindle Adapter Fits Shopsmith Mark V 5/8" Spindle to Threaded Chuck (5/8" Spindle to M14 x 1 Thread 65 mm 3 Jaw Self Centering Chuck) - Amazon.com