Drilling tool and method for producing port seals

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 therethrough, the second end comprising a shank portion, and the intermediate portion comprising at least two insert attachment seat portions;
• a first drilling insert selectively attached to the first end of the holder;
• and
• at least two secondary drilling inserts attachable to the at least two insert seat attachment portions of the intermediate portion of the holder wherein each of the at least two secondary drilling inserts comprises at least four cutting edges adapted to form a port seal in a single cutting operation, a first side register surface, a second side register surface, and a third back register surface formed in relation to the first register surface and the second register surface;
• wherein the first and secondary inserts are replaceable and non-indexable.

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 second end comprising a shank portion, and the intermediate portion comprises at least two insert attachment seat portions;
• a first cutting member selectively attached to the first end of the holder;
• and
• at least two drilling inserts attachable to the insert seat attachment portions of the intermediate portion of the holder for forming a port seal in a single cutting operation, the drilling inserts each 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 register side surface forming a bottom seating surface of each insert, a second register side surface forming a second seating surface of each insert, and each insert comprising a first cutting edge for forming the diameter of a counterbore, a second cutting edge for forming a bottom surface or spotface of the counterbore, a third cutting edge for forming a seal angle, and a fourth cutting edge for forming a chamfer,
• wherein each drilling insert is replaceable and non-indexable.