Product Description
CMT 392.250.11 Hinge Boring Bit - 25mm Diameter with Parallel Shank by CMT is a precision-engineered flat-bottom boring bit designed for drilling hinge cup holes used in European concealed hinge installation. Built on a super-strength steel body with tungsten carbide (HW) cutting components, this right-hand rotation bit delivers clean, accurate bores in solid hardwood, softwood, MDF, chipboard, and plywood. The parallel (straight) 8mm shank makes it compatible with drill presses, handheld drills, boring machines with a chuck or adapter, and CNC boring centers - giving cabinet makers and woodworkers a versatile tool for consistent hinge seat drilling across a wide range of setups.
Key Features
- Super-strength steel body - provides a rigid, durable foundation that resists flex and vibration during boring, resulting in accurately sized hinge cup holes every time.
- HW (tungsten carbide) precision-balanced centre point - self-centers on the workpiece for precise hole placement, reducing the chance of misaligned hinge cups in cabinet door applications.
- 2 HW precision-ground cutting edges (Z2) - carbide-tipped cutting teeth stay sharper longer than high-speed steel alternatives, meaning more hinge holes drilled between sharpenings and less downtime.
- 2 HW negatively ground spurs (V2) - score the wood fibers cleanly before the cutting edges remove material, producing smooth, tear-free bore walls critical for a snug concealed hinge fit.
- 25mm (63/64 in.) boring diameter - the standard size required for most European concealed hinges, making this bit a direct match for cabinet door hinge cup specifications.
- Parallel (straight) 8mm shank - fits standard drill chucks and boring machine adapters without the need for special collets, simplifying tool changes on the shop floor.
- Right-hand (RH) rotation - compatible with the standard clockwise direction of conventional drills, drill presses, and CNC boring centers, ensuring straightforward integration into existing equipment.
- 60mm total length - provides sufficient reach for hinge cup depth requirements while keeping the bit compact enough for handheld drill use in tight cabinet spaces.
Why This Product
- The combination of 2 negatively ground carbide spurs and 2 precision-ground carbide cutting edges produces a flat-bottomed hinge cup hole with clean walls - exactly what European concealed hinges require for a secure, rattle-free mount in cabinet doors.
- The HW (tungsten carbide) construction across all cutting components - centre point, cutting edges, and spurs - means this bit performs consistently across a broad range of panel materials including hardwood, softwood, MDF, chipboard, and plywood without changing tools.
- The parallel shank design gives woodworkers flexibility: the same bit works in a handheld drill for site work, in a drill press for batch production, or in a boring machine with a chuck adapter for industrial cabinet manufacturing.
- At the 25mm standard hinge cup diameter, this bit is engineered to the exact specification used by the majority of European concealed hinge systems, reducing measuring error and ensuring consistent door alignment across an entire cabinet run.
Specifications
- Manufacturer Part Number: 392.250.11
- Brand: CMT Orange Tools
- Diameter: 25mm (63/64 in.)
- Total Length: 60mm
- Shank: 8mm parallel (straight)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Blade Material: HW (tungsten carbide)
- Rotation: Right-hand (RH)
- Product Type: Hinge Boring Bit with Parallel Shank
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinges
- Cabinet door hinge mounting and installation
- Concealed hinge seat boring in face-frame and frameless cabinet construction
- Panel processing for hinge installation in MDF, chipboard, and plywood components
- Production boring on drill presses, CNC boring centers, and panel processing centers
- Site and shop use in handheld drills with standard chucks accepting 8mm parallel shanks
Frequently Asked Questions
What shank size does this hinge boring bit use, and what machines will accept it?
This bit uses an 8mm parallel (straight) shank. That shank style is accepted by standard drill chucks found on handheld drills, drill presses, boring machines fitted with an appropriate chuck or adapter, CNC boring centers, and panel processing centers - making it one of the most versatile mounting options available for a hinge boring bit.
Why does this bit use negatively ground spurs rather than standard spurs?
The 2 HW negatively ground spurs are angled to score wood fibers ahead of the cutting edges, which severs the grain cleanly before material is removed. This technique produces smooth, tear-free bore walls - a critical quality requirement when drilling hinge cup seats, since ragged walls can prevent the hinge cup from seating flush and can affect door alignment.
Is this bit suitable for drilling hinge cups in MDF and chipboard panels, or only solid wood?
The tungsten carbide (HW) cutting components - centre point, cutting edges, and spurs - are well suited for use in solid hardwood, softwood, MDF, chipboard, and plywood. The carbide material resists the abrasive nature of engineered panels such as MDF and chipboard, which would rapidly dull high-speed steel tooling.
What is the standard hinge cup diameter this bit is designed to produce, and which hinge systems does that match?
This bit bores a 25mm diameter hole, which is the standard cup size used by the vast majority of European concealed (cup) hinge systems. If you are installing 35mm arm European hinges that require a 35mm cup hole, you would need a separate 35mm boring bit. Always verify your specific hinge manufacturer's required cup diameter before selecting your bit size.
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