The Sumitomo polygon shank holders enable an extremely high stiffness connection between machine and tool. The conical polygon can take high bending and torque moments based on the combination of the face contact to the spindle. This self-guiding coupling system offers high precision and a repeatability of ± 2µm in X, Y and Z axis. While using this easy and quick coupling system it is possible to gain higher machine utilization time as the set-up and tool change times are reduced. The compact design and the high stiffness connection to the spindle offer a versatile use e.g. on multi-task machines, machining centers and turning-milling centers. Characteristics • Double-clamping system D-Type for negative holders • Holders for general turning, copying and facing • Available for negative and positive insert types