Patent ID: 8678722

Claim:
A rotatable tool for chip removing machining, comprising: a basic body having front and rear ends between which a first center axis (C 1 ) extends around which the basic body is rotatable; and a loose top having front and rear ends between which a second center axis (C 2 ) extends and a centering pin that protrudes axially rearward from the rear end, wherein the front end of the basic body includes a jaw which is delimited by two torque-transferring drivers and an intermediate bottom in which a part of the loose top is receivable, and a center hole that mouths in the bottom of the jaw and has a hole wall which extends axially inside the basic body and in which a threaded hole mouths for a screw to co-operate with the centering pin of the loose top, the centering pin being insertable into the center hole, wherein the centering pin has a cross-sectional area that is less than a cross-sectional area of the center hole, the centering pin including two diametrically opposed surfaces, wherein a first one of the surfaces forms a contact surface that extends tangentially between two axially running boundary generatrices which are situated along an imaginary first circumscribed circle (S 1 ), the center of which coincides with the second center axis (C 2 ) of the loose top, and between which an arc angle (α) is less than 180°, wherein the contact surface, via the boundary generatrices, transforms into a second one of the surfaces, the second one of the surfaces being that is spaced-apart inwardly from the first circumscribed circle (S 1 ), wherein the second one of the surfaces includes a shoulder surface, which is surrounded by two clearance surfaces extending from the boundary generatices, wherein axially behind the shoulder surface, a chamfer surface is present, which is inclined radially outward in relation to the shoulder surface, and wherein the shoulder surface is facing the threaded hole for the screw so the screw applies a turning force to the pin to urge two opposed side surfaces of the loose top against the torque-transferring drivers.