Product Description
CMT Hinge Boring Bit with Parallel Shank - 26mm x 5/16" is a precision carbide-tipped boring bit engineered for drilling clean, flat-bottom hinge cup holes required for European concealed hinge installation. Built on a super-strength steel body with two HW (tungsten carbide) cutting edges and two negatively ground carbide spurs, this bit delivers accurate, splinter-free results in a wide range of cabinet and panel materials. Right-hand rotation and a parallel (straight) shank make it compatible with drill presses, handheld drills, and boring machines equipped with a standard chuck or adapter.
Key Features
- Super-strength steel body with HW precision balance - the precision-balanced construction reduces vibration during drilling, resulting in straighter, more accurate hinge cup holes and extended tool life.
- 2 HW precision-ground cutting edges (Z2) - dual carbide cutting edges shear material cleanly and maintain a flat bottom in the bore, which is essential for proper concealed hinge seating.
- 2 HW negatively ground spurs (V2) - the negatively set carbide spurs score the material perimeter before the cutting edges engage, producing clean bore walls and crisp entry circles without tearing or chipping.
- Parallel (straight) shank - the straight shank design allows use in standard chucks on drill presses, handheld drills, and boring machines with an adapter, maximizing versatility across common shop setups.
- Right-hand (RH) rotation - matches the standard direction of rotation on virtually all drill presses and handheld drill machines, so no special configuration is required.
- 26mm cutting diameter - matches the industry-standard cup size for European concealed hinges, ensuring a proper fit without adjustment or trial fitting.
Why This Product
- The 26mm diameter is the standard hinge cup size for European concealed hinges used in cabinet door installation - using this purpose-built bit eliminates guesswork and guarantees a correctly sized pocket on the first bore.
- Two negatively ground carbide spurs paired with two carbide cutting edges work together to produce clean-walled, flat-bottom holes - reducing sanding or cleanup time between drilling and hinge fitting.
- The parallel shank at 8mm fits chucks on common handheld drills, drill presses, and boring machines with an adapter, making this bit practical for both shop production and on-site cabinet installation.
- HW (tungsten carbide) tooling on both the cutting edges and spurs maintains sharpness through repetitive drilling in chipboard, MDF, plywood, and solid wood - supporting consistent performance across high-volume cabinetry work.
Specifications
- Manufacturer Part Number: 392.260.11
- Brand: CMT Orange Tools
- Diameter: 26mm
- Total Length: 60mm
- Shank: 8mm parallel (straight)
- Number of Spurs: 2
- Number of Teeth: 2
- Rotation: Right-hand (RH)
- Blade Material: HW (tungsten carbide)
- Product Type: Hinge Boring Bit
- Series: Parallel Shank Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge mounting
- Panel processing in chipboard, MDF, plywood, solid hardwood, and softwood
- Use in drill presses with a standard chuck
- Use in handheld drills with a compatible chuck
- Use in boring machines fitted with a chuck or adapter
Frequently Asked Questions
What shank size does this boring bit use, and what machines accept it?
This bit has an 8mm parallel (straight) shank. It is compatible with drill presses, handheld drills, and boring machines that accept a standard chuck or adapter sized for an 8mm straight shank.
What materials can this 26mm hinge boring bit drill into?
The HW (tungsten carbide) cutting edges and spurs are suited for drilling into solid hardwood, softwood, chipboard, MDF, and plywood - the primary materials used in cabinet and furniture door construction.
Why does this bit have negatively ground spurs?
The two negatively ground carbide spurs (V2) score the outer perimeter of the hole before the cutting edges remove the core material. This action severs the wood or panel fibers cleanly at the entry circle, preventing tear-out and leaving clean bore walls - which matters when the hinge cup edge will be visible after installation.
Is this bit designed for right-hand or left-hand rotation?
This bit is designed for right-hand (RH) rotation, which is the standard forward direction used by nearly all drill presses and handheld drill machines. No special spindle direction setting is needed for typical use.
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