An arbor for the boring head.  Has CAT 40 taper with 1  1/2-18 " threads for the boring head and 5/8-11threads for the drawbar.  Fits many standard boring heads from 1.5-3" diameter.  A great add on or replacement for a boring head with a different taper arbor.

An arbor for the boring head.  Has R-8 taper with 1  1/2-18 " threads for the boring head and 7/16-20 threads for the drawbar.  Fits many standard boring heads from 1.5-3" diameter.  A great add on or replacement for a boring head with a different taper arbor.

YOUR CHOICE FOR BORING THE REALLY BIG STUFF. This boring head set is excellent for all LARGE size mill drills and larger machines like Bridgeport. It has the classic CAT 40 arbor with 5/8-11 drawbar threads and 1 1/2 -18 threads for the boring head mount.  The arbor is interchangeable with many others like CAT 30, R-8 Morse etc. and 5 pieces of 3/4...