This adapter socket fits into any spindle with a Morse # 4 taper to allow you to use R-8 collets. The adapter is open at the end for the drawbar and has a milled slot so you can use a locator pin for your R-8 tools. made of steel, precision ground to high tolerance.
Works with older Shoptask machines with MT 4 lathe taper as well as most mills with MT4.
CAT 40 BORING HEAD ARBOR WITH 1 1/2-18 threads and 5/8-11 drawbar threads
Boring Head Holders
Constructed of alloy steel for long, durable service life
Hardened to Rc: 56-60 for long service life
Shiny taper with black oxide finish for the best combination of accuracy and durability
ParSymmetry design for high-speed operation