Heule Tool Corporation BSF

The simple BSF (Back Spot Facer) tool concept allows back spotfacing or back counterboring in one operation without turning the workpiece.

The BSF spotfaces up to 2.3 times the bore diameter. The standard range starts with holes as small as 6.5 mm up to 20.5 mm and is designed to cut all materials.

Additional Information


  • The BSF is an economical, backwards counterboring tool. It allows the machining of large spot faces and counter bores without turning the work piece over. This means that the machining is done on the same side as the drilled hole.
  • The BSF is specifically designed for CNC machining and functions without an anti-rotation device, change of spindle direction or contact mechanism.
  • The blade expands using centrifugal force when activating the spindle and retracts with coolant pressure. The coolant pressure moves a piston which pushes a pin, forcing the blade into the blade housing.
  • The tool and blade have special coolant pipes and chip guiding geometries that continuously flush the blade and the blade window with coolant. This keeps the whole section clean, allowing optimal chip removal.