Thread milling cutter with drilling edges

摘要

A thread milling cutter with drill blade has a drill blade 6 at the leading end of a land 5 divided by grooves 3 and a tapered tapping blade 7 provided behind the drill blade, with the upper end thereof in the direction of rotation projecting outward beyond the drill blade 6. The drill blade 6 first pre-drills a hole and then the tapered strong tapping blade 7 cuts internal threads on the inner wall of the pre-drilled hole.