Made from SCM420 alloy steel and harden to RC 57-59 to provide good core strength and maximize wear life
Boring head seating surface is precision ground finished to 0.0002" TIR
To achieve AT3 or better taper contact as an industry standard, our taper surface are precision ground on Shigiya CNC grinder from Japan. The surface roughness on the taper is maintained to mirror finish.
The 1-1/2x8 threads are precision grind on a CNC grinder to ensure proper thread tolerance and engagement with a boring head.