Boring Head Shank, R8

Finally got my boring head set up in the Bridgeport, and this shank threaded on without any fuss. The 7/8"-20 thread matched perfectly, so it's holding solid with no wobble. Nice to have a proper R8 adapter that just works.

The R8 taper seats perfectly in my mill spindle with no wobble, and the 7/8"-20 threads mate cleanly with my boring head. It's solid and true, exactly what I needed to get precise bore alignment.

Threaded right onto my boring head without any fuss, and the R8 shank seated snugly in the spindle with zero wobble.