Patent ID: 8770669

Claim:
A cutting tool system for a ground milling machine, comprising: a cutter holder, including a cutting holder bore, a cutter holder stop surface and a cutter holder guide, fastenable on a milling drum; a cutting tool, including a cutting tool head and a cutting tool shaft, rotatably seated in the cutter holder bore; and a wear disc, situated between said cutting tool head and said cutter holder stop surface, having a main surface in the form of a circular ring, and enclosing a central bore for the passage of said cutting tool shaft, wherein said cutter holder guide includes two guide flanks which extend below said stop surface in relation to the longitudinal axis; and wherein said wear disc includes at least one auxiliary surface, with the auxiliary surface being angled downward in relation to the main surface, and at least one groove formed on said auxiliary surface; and wherein said cutter holder guide engages said groove to prevent relative rotation between said wear disc and said cutter holder, providing; a rotation-locked wear disc.