Product Description
CMT 392.400.11 Hinge Boring Bit - 40mm (1-37/64") Diameter with 5/16" Parallel Shank by CMT is a precision-engineered carbide-tipped boring bit designed specifically for drilling flat-bottom hinge cup holes for European concealed hinges. Built for use in drill presses, handheld drill machines, and router tables, this right-hand rotation bit delivers clean, accurate bores in solid hardwood, softwood, MDF, chipboard, and plywood. Whether you are installing cabinet door hinges or setting up a production run of concealed hinge mortises, this parallel shank boring bit provides the repeatability and cutting precision that cabinetmakers and woodworkers depend on.
Key Features
- Super-Strength Steel Body with HW (Carbide) Tips - the high-density tungsten carbide cutting material bonded to a super-strength steel body delivers long-lasting edge retention, reducing the frequency of bit replacement during high-volume boring operations.
- Precision-Balanced Centre Point - the HW precision-balanced centre point locates the bit exactly on the marked centre before the spurs and cutting edges engage, preventing the bit from wandering and ensuring accurate hole placement every time.
- 2 HW Precision-Ground Cutting Edges (Z2) - dual carbide cutting edges produce a true flat-bottom bore, which is the exact geometry required for seating European concealed hinge cups flush and level in cabinet doors.
- 2 HW Negatively Ground Spurs (V2) - the pair of negatively ground carbide spurs score the material ahead of the cutting edges, preventing tear-out at the rim of the hole and producing clean, splinter-free bore walls in all compatible wood-based panel materials.
- Parallel (Straight) Shank Design - the 8mm parallel shank is compatible with standard drill chucks, boring machine adapters, and handheld drills, making this bit versatile across a wide range of machines without requiring special collets.
- Right-Hand (RH) Rotation - configured for standard right-hand rotation, matching the direction of conventional drill presses, handheld drills, and CNC boring centers so no special setup is required.
- 40mm Cutting Diameter - matches the industry-standard 40mm cup hole specification used by virtually all European concealed hinge manufacturers, ensuring proper hinge cup fit without modification.
Why This Product
- Industry-Standard 40mm Diameter - the 40mm bore diameter is the universally accepted size for European concealed hinge cup holes, meaning this bit aligns directly with hinge manufacturer specifications and eliminates the risk of a mismatched fit during cabinet door installation.
- Carbide Construction for Demanding Materials - with HW (tungsten carbide) cutting edges and spurs, this bit handles abrasive engineered panels such as MDF, chipboard, and plywood - materials that rapidly dull high-speed steel tooling - while maintaining cutting performance across extended use.
- Clean Entry and Exit in Finished Panels - the combination of negatively ground spurs and precision-ground cutting edges means the bit scores and severs wood fibres cleanly before removing material, making it suitable for use on pre-finished or veneered panel surfaces where tear-out would be visible and unacceptable.
- Wide Machine Compatibility - the parallel shank design works with handheld drills, drill presses, and boring machines fitted with a standard chuck or adapter, giving shops and individual woodworkers the flexibility to use this bit across different equipment setups without investing in additional tooling holders.
Specifications
- Manufacturer Part Number: 392.400.11
- Brand: CMT Orange Tools
- Diameter: 40mm (1-37/64")
- Total Length: 60mm
- Shank: 8mm Parallel (Straight)
- Number of Teeth: 2
- Number of Spurs: 2
- Blade Material: HW - Tungsten Carbide (TCT)
- Rotation: Right-Hand (RH)
- Product Type: Hinge Boring Bit
- Series: Parallel Shank Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinges
- Cabinet door hinge mortising and concealed hinge installation
- Hinge cup boring in solid hardwood and softwood
- Hinge boring in chipboard, MDF, and plywood panels
- Use in drill presses, handheld drills, and boring machines with standard chuck or adapter
- Use in router tables
Frequently Asked Questions
What shank size does the CMT 392.400.11 use, and what machines is it compatible with?
The 392.400.11 features an 8mm parallel (straight) shank. This design is compatible with handheld drills, drill presses, router tables, and boring machines fitted with a standard drill chuck or adapter. No special collet is required for most setups.
What is the cutting diameter of this boring bit, and which hinge size does it match?
The cutting diameter is 40mm (1-37/64"). This is the industry-standard cup hole diameter used for European concealed hinges. Drilling at this diameter allows the hinge cup to seat correctly in cabinet doors as specified by European hinge manufacturers.
What materials can this hinge boring bit cut through?
The 392.400.11 is suitable for use in solid hardwood, softwood, chipboard, MDF, and plywood. The HW (tungsten carbide) cutting edges and negatively ground spurs are designed to handle both solid wood and abrasive engineered panel materials while producing clean bore walls.
What does "negatively ground spurs" mean, and why does it matter for my project?
The 2 HW negatively ground spurs (V2) score the surface of the workpiece ahead of the main cutting edges. This severs the wood fibres at the perimeter of the hole before material is removed, which prevents tear-out and splintering at the rim of the bore. This is particularly important when working on pre-finished panels, veneered surfaces, or any application where a clean, chip-free entry point is required.
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