Product Description
CMT Hinge Boring Bit 40 x 70mm Right-Hand by CMT is a long-series carbide-tipped boring bit engineered for drilling precise flat-bottom hinge cup holes required by European-style concealed hinge systems. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 40mm diameter bit delivers the accuracy and clean wall finish that cabinet makers and panel processing operations demand. The 70mm overall length makes it well-suited for boring into thicker cabinet components where standard-length bits fall short, and the PTFE-coated spiral flutes keep the cutting zone clear of pitch and resin buildup during extended production runs.
Key Features
- Carbide (HW) Cutting Head with Precision Balanced Centre Point - the tungsten carbide tip stays sharp through demanding production cycles in hardwood, softwood, MDF, chipboard, and plywood, reducing tool change frequency and keeping holes consistently on-center.
- 2 Precision Ground Cutting Edges (Z2) with Negatively Ground Spurs - negatively set spurs shear the wood fibers cleanly before the main cutting edges clear the waste, producing smooth bore walls and a flat bottom with minimal tearout - critical for proper concealed hinge seating.
- 2 Spiral Flutes with PTFE Coating - the orange or black PTFE coating on the spiral portion prevents pitch, resin, and adhesive buildup, keeping chips evacuating freely and extending the service life of the bit.
- 10 x 26mm Parallel Shank with Driving Flat and Length Adjusting Screw - the standardized parallel shank with driving flat locks securely into multi-spindle CNC boring machines, boring centers, and drill press chucks, while the length adjusting screw allows precise depth tuning without resetting the machine stop.
- Long-Series 70mm Total Length - the extended length provides the clearance needed to bore hinge cup holes in thicker cabinet panels and doors where compact-series bits cannot reach the required depth.
- Right-Hand (RH) Rotation - matches the standard spindle direction of virtually all boring machines and handheld drills, ensuring immediate compatibility without adapter modification.
Why This Product
- The 40mm cutting diameter is the industry-standard hinge cup size for European concealed hinges, making this bit a direct-fit solution for cabinet door hinge installation without requiring custom setups or diameter adjustments.
- The long-series 70mm length solves the specific challenge of boring hinge cups in thicker cabinet components and solid hardwood doors where shorter bits cannot achieve full seating depth for the hinge cup.
- The combination of negatively ground spurs and a precision balanced centre point means the hole starts cleanly and stays on location, which directly reduces reject rates in high-volume panel processing and cabinetry production.
- PTFE-coated flutes and a carbide cutting head work together to extend intervals between sharpenings - especially valuable when working with resinous hardwoods, glued chipboard, or MDF that would rapidly dull an uncoated high-speed steel bit.
Specifications
- Manufacturer Part Number: 369.400.11
- Brand: CMT Orange Tools
- Diameter: 40mm
- 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 cabinetry
- Hinge boring in solid hardwood cabinet components
- Hinge cup drilling in softwood, MDF, chipboard, and plywood panels
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center applications
- Boring machine use with adapter or chuck
- Drill press hinge cup boring
Frequently Asked Questions
What is the difference between the 70mm long-series length and a standard-length hinge boring bit?
The 70mm total length provides additional clearance for boring hinge cup holes in thicker cabinet doors and panels. When the component thickness or the machine's spindle-to-surface distance requires greater reach, the long-series 70mm bit maintains the full cutting depth needed for proper concealed hinge cup seating, where a compact-series bit would not reach.
What does the PTFE coating on the spiral flutes do during use?
The PTFE coating on the spiral portion of the bit resists pitch, resin, and glue adhesion. This keeps chips evacuating freely from the bore rather than packing around the flutes, which reduces heat buildup, maintains cutting performance, and extends the interval between sharpenings - particularly useful when boring into MDF, chipboard, or resinous hardwoods.
What is the purpose of the length adjusting screw on the shank?
The parallel shank includes a length adjusting screw that allows the operator to set the precise drilling depth directly on the bit. This enables accurate, repeatable hinge cup depth without relying solely on the machine's depth stop, which is especially helpful when running multiple identical components in production cabinet making.
How many cutting edges does this hinge boring bit have, and why does tooth geometry matter for hinge cup quality?
This bit features 2 precision ground cutting edges (Z2) paired with 2 negatively ground spurs. The negatively ground spurs score and sever the wood fibers ahead of the main cutting edges, which prevents tearout at the rim of the hinge cup opening. The result is a clean bore wall and a flat bottom - both required for the hinge cup to seat flush and the concealed hinge to function correctly.
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