HEULE Precision Tool Expands Back Spot Facing Capabilities
November 1, 2026
New tooling from HEULE Precision Tools allows back spot facing (BSF) for bore diameters to 45 mm, with large widths of cuts.
Now, spot facings or counterbores such as screw head counterbores can be cost effectively machined on the back side of the workpiece without rotating the workpiece, thus avoiding time-consuming clamping and repositioning. It is suited for counterbores up to 2.3 x diameter and features a maximum cutting width of 22.5 mm on flat or slightly uneven surfaces, and in some cases interrupted cutting conditions. The BSF is designed for automatic operation, and since it does not require a torque arm or any machine adaptations, is ready for immediate use. For bores larger than 21.0 mm, each BSF is designed to customer specifications. Double bladed tools are available for bores of 30.0 mm and larger. In addition to screw head counterbores, BSF tooling is suited for gear housings, yokes, engine casings, and other parts in a wide range of materials.
BSF tooling is designed for CNC machining and functions without an anti-rotation device, change of spindle direction, or contact mechanism, 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 casting flanges, and bolt head faces. The simple swing mechanism yields optimal cutting performance, resulting in consistent spot facing and fewer scrapped parts.
The blade expands using centrifugal force when activating the spindle, and retracts from coolant pressure of 25-50 bar, air pressure, or manually, which moves a piston to depress a pin which retracts the closed blade into the blade housing. The tool works vertically and horizontally, with replaceable carbide-coated blades for extended tool life. Designed for optimal cutting performance, chip removal, and reliability, the BSF coolant-through tool and blade feature special coolant pipes and chip-guiding geometries that continuously flush the blade window and the blade itself with coolant. This keeps the work area clean and allows for optimal chip removal. All tool components and blades are easy to replace.
For more information contact:
HEULE Tool Corporation
131 Commerce Dr.
Loveland, OH 45140
513-643-9599
info@heuletool.com
www.heuletool.com
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