Patent ID: 8597086

Claim:
A tool holder comprising: a main body including two end portions in an axial direction thereof, one of the two end portions being attachable to a spindle; a taper cone including a taper portion and movable in the axial direction within the main body; a working portion mounted on an outer peripheral portion of the other of the two end portions and including a taper bottom surface which engages with the taper portion, the taper bottom surface being movable in a radial direction of the main body based on a movement of the taper cone in the axial direction; a coolant flow passage through which a coolant flows at a constant supply pressure, wherein a part of the coolant presses and moves the taper cone in the axial direction and another part of the coolant flows out to an outside so as to adjust a pressing force; and an adjuster removably fitted into a screw hole penetrating from the coolant flow passage to an outer periphery of the main body and including a coolant flow-out hole for adjusting a flow-out of the coolant to the outside.