Press contact of the flat surfaces of the spindle and the chuck is directed by the taper contacting, which brings about excellent runout accuracy, boring precision and repeatability of tool changing, and also minimizing slight waviness at the machining and thus enabling suit for heavy duty cutting.

Due to the short and tapered shank, the tool changing is possible even in a very limited space.

The locking of the chuck to the spindle is secured by the eccentric pin and the steel balls, ensuring the locking even at an emergency stoppage as well as in such machining of both CW and CCW rotations at the tapping work.

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