Patent ID: 6984094

Claim:
A drilling tool comprising: a tool holder having a first end, a second end, and an intermediate portion between the first end and the second end, and a rotational axis, the first end comprising a holder slot having a bottom seating surface and at least one attachment arm positioned on each side of the holder slot, the second end comprising a shank portion, and the intermediate portion comprises at least one insert attachment seat portion; a first drilling insert having cutting surfaces formed transverse to each other on a first end, and a mounting surface on a second end thereof, the first drill insert being selectively mounted along the rotational axis of the holder within the holder slot of the first end of the holder; and at least one second drilling insert attachable to the insert seat attachment portion of the intermediate portion of the holder, the second drilling insert comprising a cutting face side opposite a register face side, and a plurality of side surfaces therebetween, the plurality of side surfaces comprising a first resister side surface formed generally perpendicular to the rotational axis of the tool forming a bottom seating surface of the second insert, a second register side surface formed generally parallel to the rotational axis of the tool forming a radial inward seating surface of the second insert, a first cutting edge generally parallel to the rotational axis of the tool for forming the diameter of a counterbore, a second cutting edge generally perpendicular to the first cutting edge for forming a bottom surface or spotface of the counterbore, a third cutting edge formed transverse to the rotational axis of the cutting tool for forming a seal angle, and a fourth cutting edge formed transverse to the rotational axis of the cutting tool for forming a chamfer, wherein the first register side surface of the second insert extends radially from the second resister side surface to the first cutting edge and the second register side surface extends axially from the first resister side surface to at least beyond the third cutting edge, wherein the first and second drilling inserts are replaceable and non-indexable.