Shank for a milling tool

In combination, a chuck and a shank, wherein:

• said chuck includes an axial bore, a contact surface disposed at an open end of said bore, and first and second locking screws movable toward and away from said bore, said locking screws having respective first and second axes oriented transversely relative to a longitudinal axis of said bore, and
• said shank including a machining portion for carrying a milling tool, and a clamping portion extending from said machining portion, said clamping portion being of smaller cross section than said machining portion to form therebetween a transition surface extending transversely of a longitudinal axis of said clamping portion, said clamping portion being receivable in said bore and including a cylindrical outer periphery having first and second recesses, said first recess arranged to receive said first locking screw for clamping said transition surface against said contact surface, said second recess arranged to be contacted by said second locking screw for preventing rotation of said shank within said bore, said second recess including first and second surfaces disposed longitudinally adjacent one another and being inclined relative to one another said second locking screw contacting only said first or said second surface.