Abstract: A milling cutter including a supporting body having a longitudinal axis and presenting a frontal face and a circumferential side. The supporting body is provided with a radial recess. A plurality of cutting plates are disposed along the circumferential side and arranged in rows each extending generally in the longitudinal direction of the supporting body. At least one of the cutting plates is a face cutting plate having a cutting edge for cutting at both the circumferential side and at the frontal face. The cutter includes a cassette having a quadrilateral cross section and disposed in the recess. The face cutting plate is fastened to the cassette, and at least one fastening element is provided for releasably tightening the cassette in the recess.

Abstract: A tool assembly has a tool head insertable on a basic tool holder. The basic tool holder has a longitudinally displaceable locking bar and a plurality of slidable locking pins actuated by the locking bar. In a first position of the locking bar the locking pins are in an advanced position in which they project into respectively aligned lock holes of the tool head inserted on the basic tool holder. In a second position of the locking bar the locking pins are in a withdrawn condition, permitting the tool head to be pulled off the basic tool holder.

Abstract: A cutting tool bit has a central mounting hole, a planar bottom face and an opposite top face having a central zone situated at a lower level than the marginal zones thereof; chip breaking elements formed on the top face; and lateral faces each defining a cutting edge with the top face. Each cutting edge has linear length portions sloping from opposite ends of the cutting edge in the direction of its middle towards the bottom face. There is further provided an elevation situated in the central zone of the top face and a plurality of surfaces each situated between a respective cutting edge and the elevation. The chip breaking elements are formed by the surfaces and the elevation.

Abstract: A drilling tool, particularly for working metals, in which a tool holder is provided at its frontal or end surface with a receiving slot which is open on three sides and in which an interchangeable blade type drill bit is fastened. A bar-shaped adapter is symmetrically inserted into the receiving slot between the drill bit and the bottom surface of the slot. The adapter extends laterally beyond the periphery of the tool holder with one end surface abutting the bottom surface of the slot and the opposite end surface contacting and providing an abutment for at least the portions of the blade shaped drill bit which extend laterally beyond the periphery of the tool holder.