HEULE's BSF tool is for automated high-volume back spotfacing applications. The BSF tool, suitable for counterbores up to 2.3 times diameter and ranging in size from 6.5mm to 20.5mm (0.256" to 0.807"), is sold standard-stock, shipped the next day from the Cincinnati warehouse.

This unique tooling works without an antirotation device, change of spindle direction or any machine adaptations, allowing components to be spot faced in the same direction as the bore is drilled. This saves the time and cost of turning the workpiece, while allowing the spot facing of difficult to reach areas like yoke forks and screw-head countersinks.

The blade expands using centrifugal force when activating the spindle, and retracts from coolant pressure, which moves a piston to depress a pin which retracts the closed blade into the housing. The simple swing mechanism combined with the internal coolant pressure system yields optimal cutting performance, resulting in consistent spotfacing and fewer scrapped parts.

The tool works both vertically and horizontally, with replaceable carbide-coated blades for extended tool life. The tools are ideal for gear housings, yokes, engine casings and other parts in a wide range of materials.