Product Description
CMT Hinge Boring Bit 35 x 70mm Right-Hand is a long-series boring bit engineered for drilling precise flat-bottom hinge cup holes required for European-style concealed hinge installation. Built on a super-strength steel body with a tungsten carbide (HW) head, this 35mm diameter bit delivers consistent, clean results in cabinet door and panel applications where accuracy is critical. The PTFE-coated spiral flutes resist pitch and adhesive buildup, keeping the tool running cleanly through repeated production cycles in solid wood, engineered panels, and composite sheet goods.
Key Features
- Tungsten Carbide (HW) Head - a carbide cutting head bonded to a super-strength steel body provides exceptional edge retention through high-volume hinge boring operations, reducing downtime from resharpening or replacement.
- PTFE-Coated Spiral Portion - the orange or black PTFE coating on the spiral flutes prevents resin, pitch, and glue buildup, maintaining smooth chip evacuation and extending operational tool life between cleanings.
- Precision-Balanced Centre Point - the accurately centered tip locates the bore precisely before the cutting edges engage, reducing drift and delivering repeatably centered hinge cup holes across every workpiece.
- 2 Negatively Ground Spurs (Z2) - the negatively ground spur geometry scores the wood fibers cleanly ahead of the main cutting edges, producing smooth, tear-out-free bore walls and a flat bottom required for concealed hinge cups.
- 2 Spiral Flutes - dual flutes provide balanced chip clearance, reducing heat buildup and helping maintain consistent bore geometry even in dense materials like hardwood or chipboard.
- Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 26mm parallel shank with a driving flat seats securely in boring machine chucks or adapters, while the length-adjusting screw allows precise depth setting for accurate hinge cup depth every time.
- 35mm Diameter, 70mm Total Length - the long-series 70mm body provides the reach needed when boring hinge cup holes in thicker cabinet components or when the machine spindle standoff requires additional bit length.
- Right-Hand Rotation (RH) - designed for standard right-hand rotating spindles on CNC boring centers, multi-spindle boring machines, drill presses, and handheld drills, ensuring compatibility with the widest range of common boring equipment.
Why This Product
- The long-series 70mm length makes this bit the correct choice for boring hinge cup holes in thicker cabinet panels or carcass sides where a standard-length bit would not reach the required depth or would lose stability at the machine spindle.
- The combination of a carbide cutting head and PTFE-coated spiral means the bit resists both cutting-edge wear and pitch/glue fouling simultaneously - two of the most common causes of poor hole quality in production cabinet work.
- The precision-balanced centre point and negatively ground spurs work together to produce the flat-bottom, clean-walled 35mm bore that European concealed hinges require for proper seating and door alignment - with no secondary cleanup needed.
- The parallel shank with driving flat and adjusting screw is designed for direct use in boring machines with chucks or adapters, making this bit a straightforward drop-in solution for both dedicated hinge boring machinery and general-purpose drill presses.
Specifications
- Manufacturer Part Number: 369.350.11
- Brand: CMT Orange Tools
- Diameter: 35mm
- 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 mounting in face-frame and frameless cabinet construction
- Boring hinge recesses in solid hardwood cabinet components
- Hinge cup boring in softwood, MDF, chipboard, and plywood panels
- Production hinge boring on multi-spindle CNC boring machines and boring centers
- Hinge boring on panel processing centers and CNC boring centers
- Boring with a boring machine equipped with an adapter or chuck
- Hinge cup drilling on a drill press or with a handheld drill using the parallel shank
Frequently Asked Questions
What is the difference between this 70mm long-series bit and a standard-length hinge boring bit?
This bit has a total length of 70mm, which provides additional reach beyond what a shorter-series bit offers. The extra length is useful when boring hinge cup holes in thicker cabinet components or when the spindle standoff distance on a boring machine requires more bit length to achieve the correct cutting depth without losing stability.
What does the PTFE coating on the spiral portion do?
The PTFE coating applied to the spiral flutes resists the accumulation of pitch, resin, and wood glue during cutting. This helps maintain smooth chip evacuation from the bore, reduces friction-related heat, and extends the time between cleaning cycles - directly contributing to longer tool life and more consistent hole quality in production use.
What shank does this bit use, and what machines is it compatible with?
This bit uses a 10 x 26mm parallel shank with a driving flat and a length-adjusting screw. That shank configuration is compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, boring machines with an adapter or chuck, drill presses, and handheld drills equipped to accept a parallel shank.
Why do the spurs use a negative grind geometry?
Negatively ground spurs are designed to score the wood fibers at the perimeter of the bore before the main cutting edges remove material. This shearing action at the outer edge of the hole minimizes tear-out and produces clean, smooth bore walls - an important quality requirement when the 35mm hinge cup must seat a European concealed hinge precisely and without surface damage.
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