Product Description
CMT Hinge Boring Bit 45 x 70mm Right-Hand is a long-series carbide-tipped boring bit engineered for drilling precise flat-bottom hinge cup holes in cabinet components. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 45mm diameter bit is the go-to tool for European-style concealed hinge installation in solid hardwood, softwood, MDF, chipboard, and plywood. The 70mm overall length makes it well-suited for thicker panel stock where standard-length bits fall short, and the PTFE-coated spiral flutes keep the cutting zone clean during extended production runs.
Key Features
- Tungsten Carbide (HW) Cutting Head - a hard-metal tip bonded to a super-strength steel body delivers long edge retention and consistent bore quality, reducing the frequency of bit changes during high-volume cabinet production.
- PTFE-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion resists pitch and glue buildup, keeping chips clearing freely and extending usable tool life between sharpenings.
- Precision-Balanced Centre Point - a precisely ground centre point starts the bore on-location without walking, producing accurate hole placement critical for proper hinge alignment and door swing.
- 2 Negatively Ground Spurs (V2) - two precision-ground spurs score the wood fiber ahead of the cutting edges, leaving clean bore walls and a flat bottom with no tear-out - a requirement for neat European concealed hinge seating.
- 2 Precision Ground Cutting Edges (Z2) - dual cutting edges balanced around the centre point share the workload evenly, producing a flat-bottom hole that matches the hinge cup geometry without secondary cleanup.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 26mm parallel shank locks securely in a boring machine chuck or adapter, and the built-in length adjusting screw allows fine-tuning of drilling depth without readjusting the machine stop.
- Right-Hand (RH) Rotation - designed for standard right-hand rotation spindles found on multi-spindle CNC boring machines, CNC boring centers, panel processing centers, drill presses, and handheld drills, making it a direct drop-in for the most common shop equipment.
- Long 70mm Series Length - the extended 70mm total length provides the reach needed to bore hinge cup holes in thicker cabinet door and panel components where shorter bits cannot reach full depth.
Why This Product
- The 45mm diameter matches the industry-standard hinge cup size used with European concealed hinges, meaning no adapting or compromising - the hole is the correct dimension straight from the bore.
- The 70mm long-series body gives woodworkers and cabinet shops the reach to work with thicker door blanks and panel components that standard-length hinge boring bits cannot accommodate.
- The combination of negatively ground spurs, a precision-balanced centre point, and two ground cutting edges means the bit enters cleanly, cuts a flat bottom, and exits without tear-out - delivering a hinge-ready hole in a single pass.
- The PTFE-coated spiral and carbide-tipped head are built for production environments where the bit runs continuously across many holes per shift, maintaining cut quality without frequent interruptions for cleaning or replacement.
Specifications
- Manufacturer Part Number: 369.450.11
- Brand: CMT Orange Tools
- Diameter: 45mm
- 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
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge mounting in production and custom cabinet shops
- Boring hinge cup recesses in solid hardwood components
- Boring hinge cup recesses in softwood door blanks
- Hinge cup drilling in MDF and chipboard panel stock
- Hinge cup drilling in plywood cabinet components
- Use in multi-spindle CNC boring machines
- Use in CNC boring centers and panel processing centers
- Use in boring machines with a compatible adapter or chuck
- Use in handheld drills and drill presses with parallel shank compatibility
Frequently Asked Questions
What shank size does this hinge boring bit use, and how is it secured in the machine?
This bit uses a 10 x 26mm parallel shank fitted with a driving flat and a length adjusting screw. The driving flat ensures the shank seats securely in the spindle without slipping, and the length adjusting screw allows precise depth setting without repositioning the machine stop.
Why does this bit have negatively ground spurs, and what does that do for hole quality?
Negatively ground spurs are angled to score the wood fiber at the outer edge of the bore before the main cutting edges remove material. This severs the fibers cleanly rather than tearing them, which produces smooth bore walls and a clean entry circle - important for a tight, professional hinge cup fit.
What is the purpose of the PTFE coating on the spiral flutes?
The orange or black P.T.F.E. coating on the spiral portion resists the buildup of pitch and wood glue during drilling. This keeps chips evacuating freely through the flutes, reduces heat from friction, and extends the working life of the bit - particularly useful in production settings where the bit runs through many holes per session.
Is this bit compatible with left-hand rotation spindles or reversible drill presses?
No. This bit is designed exclusively for right-hand (RH) rotation. It should only be used with spindles and machines that rotate in the standard clockwise (right-hand) direction. Using a right-hand bit in a left-hand spindle will prevent the cutting edges from engaging properly and will damage the tool.
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