Product Description
CMT Hinge Boring Bit 26 x 70mm Right-Hand (RH) by CMT is a long-series boring bit engineered for drilling precise flat-bottom hinge cup holes in cabinet components. Built to the demands of European-style concealed hinge installation, this 26mm diameter bit delivers clean, accurate bores in solid wood, MDF, chipboard, plywood, and softwood - making it a reliable choice for cabinetmakers, panel processors, and woodworking professionals who need repeatable, production-quality results.
Key Features
- Tungsten Carbide (HW) Cutting Head - the carbide-tipped head maintains a sharp edge through high-volume production runs, reducing downtime from frequent resharpening and extending the usable life of the bit in demanding shop environments.
- Precision-Balanced Centre Point - the balanced centre point self-locates on the workpiece accurately, preventing bit wander at entry and producing consistently centered hinge cup holes across repeated bores.
- 2 Precision-Ground Negatively Set Spurs - the negatively ground spurs score the wood fibers cleanly ahead of the cutters, producing flat-bottom holes with smooth, chip-free walls - critical for a flush hinge cup seating surface.
- 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges ensure a balanced cutting action that reduces vibration, extends tool life, and produces a clean, true flat bottom on every bore.
- 2 Spiral Flutes - the spiral flutes evacuate chips efficiently during boring, keeping the cut zone clear and reducing heat buildup that can cause tear-out or bit wear in dense materials.
- PTFE-Coated Spiral Portion - the orange or black PTFE coating on the spiral prevents pitch and glue buildup from adhering during boring operations, keeping the bit clean and reducing drag - especially valuable when working with resin-rich or adhesive-laminated panel materials.
- Super-Strength Steel Body - the high-strength steel shank and body resist flex and deflection under cutting loads, maintaining bore geometry and bit alignment throughout the full 70mm length.
- 10 x 26mm Parallel Shank with Driving Flat and Length-Adjusting Screw - the parallel shank is compatible with multi-spindle CNC boring machines, boring centers, adapters, drill presses, and hand drills, and the length-adjusting screw allows precise depth setting without additional tooling.
- Right-Hand (RH) Rotation - the RH rotation is matched to standard boring machine spindle direction, ensuring correct cutting geometry and chip ejection for clean, efficient hinge boring without requiring spindle reversal.
- Long 70mm Series Length - the extended total length accommodates thicker cabinet door stiles and panels where a shorter bit would not provide sufficient depth capacity, broadening the range of workpieces this bit can handle.
Why This Product
- The 26mm diameter directly matches the cup dimension required for European-style concealed hinges, eliminating the need for custom sizing and ensuring a proper-fit hinge cup in every bore.
- The combination of negatively ground spurs, a precision-balanced centre point, and dual carbide cutting edges produces clean, flat-bottom holes in a single pass - reducing secondary cleanup work and improving throughput on cabinet production lines.
- The PTFE-coated spiral and chip-clearing flute design make this bit well suited for resin-laminated panels, chipboard, and adhesive-coated materials where pitch buildup is a common cause of bit failure or degraded hole quality.
- The adjustable-depth parallel shank gives this bit compatibility across multiple machine types - from CNC boring centers to benchtop drill presses - making it a versatile single-purchase solution for shops running mixed equipment.
Specifications
- Manufacturer Part Number: 369.260.11
- Brand: CMT Orange Tools
- Diameter: 26mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Rotation: Right-Hand (RH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Product Type: Hinge Boring Bit
- Series: Hinge Boring Bit 70mm
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge cup boring in solid hardwood
- Hinge mortise boring in softwood cabinet components
- Hinge cup drilling in chipboard and particle board panels
- Flat-bottom boring operations in MDF
- Hinge cup holes in plywood cabinet doors and frames
Frequently Asked Questions
What machines is this hinge boring bit compatible with?
The 10 x 26mm parallel shank with driving flat and length-adjusting screw makes this bit compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, boring machines using an adapter or chuck, drill presses, and handheld drills. The adjusting screw allows depth to be set precisely in any of these configurations.
Why does this bit have a PTFE coating on the spiral, and what does it do?
The spiral portion is coated with PTFE (in orange or black) to prevent pitch and glue from adhering to the bit during boring. This is particularly useful when working with resin-rich wood species, chipboard, or adhesive-laminated panels, as buildup on the spiral increases drag, generates heat, and degrades hole quality. The coating keeps the spiral clean and helps the bit run efficiently over extended use.
Why are the spurs negatively ground, and what advantage does that provide?
Negatively ground spurs are angled to score the wood fibers cleanly at the perimeter of the bore before the main cutters remove material. This approach minimizes tear-out at the bore wall and produces a cleaner, smoother hole perimeter - which is important for a flat-bottom hinge cup where the rim of the cup must seat flush against the hinge plate without gaps or splintering.
Is this bit designed for right-hand or left-hand spindle rotation?
This bit is designed for right-hand (RH) rotation only. It must be used in spindles or chucks that rotate in the standard right-hand (clockwise when viewed from the shank end) direction. Using a right-hand bit in a left-hand spindle will cause incorrect cutting geometry, poor hole quality, and accelerated tool wear. If a left-hand spindle is required, a separate LH-designated bit would be needed.
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