Patent ID: 7115083

Claim:
A cutting tool holder for a machining center comprising a body having a proximal end; a distal end; a conical hole formed in the proximal end and having an opening and a bottom wherein the conical hole tapers smaller from the opening to the bottom; a containing recess formed in the distal end, corresponding to the conical hole and having a bottom face; and multiple screw holes formed in the bottom face of the containing recess; a fastening device mounted in the containing recess and having a base comprising an inner surface; an outer surface; an annular wall; a through hole formed through the base; multiple fastening holes formed around the through hole and through the base; multiple fasteners respectively extended into the fastening holes and the screw holes to hold the base and the body together; and at least two positioning holes formed in the annular wall to communicate with the through hole and each of the at least two positioning holes having an inner opening and an outer opening; at least two positioning elements respectively located in the at least two positioning holes; and a locking element mounted around the base and holding the at least two positioning elements in position.