Abstract: A replaceable drill tip and drill shank combination has a serrated and dowel pinned drill tip and drill shank interface, wherein the drill tip has a serrated bottom surface and a channel for receiving a dowel pin which extends axially from a drill shank, the drill shank having a serrated distal end which engages with the serrations in the bottom surface of the drill tip, and fasteners which extend through the drill tip into the drill shank.

Abstract: A replaceable drill tip and drill shank combination has a serrated and dowel pinned drill tip and drill shank interface, wherein the drill tip has a serrated bottom surface and a channel for receiving a dowel pin which extends axially from a drill shank, the drill shank having a serrated distal end which engages with the serrations in the bottom surface of the drill tip, and fasteners which extend through the drill tip into the drill shank.

Abstract: A location and drive interface connection for machine tools and drive systems uses cooperating first and second sets of serrations at oblique angles on the mating surfaces of a drive component and a driven component for location and torque transfer. The oblique intersecting angles of the serrations provide for single precise location and alignment and high-efficiency torque transfer through the meshed serrations.