The TOPlus chuck from Hainbuch America has a cast resin hexagonal core, which makes the chuck lighter than a steel one. This results in lower inertia—an advantage during high spindle acceleration, according to the company. The resin also provides a damping effect.
The TOPlus is based on six angled steel plates, which are cast in resin to form the chuck taper. To match this arrangement, the clamping head also has six flat outer surfaces, which mate precisely with the chuck’s surfaces. Whether the chuck is open or closed, the clamping taper is sealed.