Product Description
CMT Hinge Boring Bit 18 x 70mm Right-Hand is a long-series boring bit engineered by CMT for drilling precise flat-bottom hinge cup holes required by European-style concealed hinge installations. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 18mm diameter bit delivers clean, accurate bores through cabinet components, panel materials, and furniture substrates where standard-length bits cannot reach adequate depth. The PTFE-coated spiral flutes and negatively ground spurs make it a reliable choice for cabinetmakers, furniture manufacturers, and CNC operators who demand consistent hole quality on every production run.
Key Features
- Tungsten Carbide (HW) Cutting Head - provides exceptional hardness and edge retention when boring into chipboard, MDF, plywood, and solid wood, reducing resharpening frequency in high-volume production.
- PTFE-Coated Spiral Portion - the orange or black PTFE coating prevents pitch and glue buildup on the flutes, so chips evacuate cleanly and the bit stays cutting efficiently without clogging.
- Precision Balanced Centre Point - keeps the bit perfectly centered at the start of each bore, eliminating walk and producing consistently positioned hinge cup holes for accurate door alignment.
- 2 Precision Ground Cutting Edges (Z2) - dual cutting edges with negatively ground spurs score and shear material cleanly, delivering flat-bottom holes with smooth walls and no tear-out around the rim.
- 2 Spiral Flutes - efficient chip evacuation during drilling reduces heat buildup and extends carbide life across extended production cycles.
- 70mm Total Length (Long-Series) - the extended reach makes this bit suitable for drilling hinge cup holes in thicker cabinet components and panel stacks where shorter bits would fall short.
- 10 x 26mm Parallel Shank with Driving Flat and Length Adjusting Screw - the driving flat prevents slippage in the chuck or spindle, while the length adjusting screw allows precise depth setting so every hinge cup hole lands at exactly the right depth.
- Right-Hand (RH) Rotation - compatible with all standard right-hand-drive boring machines, CNC boring centers, and drill presses without any spindle modification.
Why This Product
- The 70mm long-series length addresses a specific production need: drilling hinge cup holes in thicker cabinet door and panel materials where standard-length boring bits cannot achieve the required bore depth - making this the correct tool for the job rather than a workaround.
- The combination of a carbide cutting head and PTFE-coated flutes means the bit resists both edge wear and material adhesion simultaneously, extending usable tool life in shops that run chipboard, MDF, or glued panels continuously.
- The negatively ground spurs and precision balanced centre point work together to produce the clean-walled, flat-bottom holes that European concealed hinges require for a flush, rattle-free fit - reducing the risk of rejected parts or hinge fitting problems on the line.
- The parallel shank with driving flat and length adjusting screw gives operators direct control over both grip security and bore depth, supporting repeatable results across multi-spindle CNC boring machines, boring centers, and drill press setups.
Specifications
- Manufacturer Part Number: 369.180.11
- Brand: CMT Orange Tools
- Product Type: Hinge Boring Bit
- Diameter: 18mm
- 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)
- Body Material: Super-strength steel
- Spiral Coating: PTFE (orange or black)
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge mounting in thicker panel components
- Furniture production boring in solid hardwood
- Hinge cup boring in softwood, chipboard, MDF, and plywood
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center use
- Boring machine use with adapter or chuck
- Drill press hinge cup drilling
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 gives it extended reach into thicker cabinet components and panel stacks. Standard-length hinge boring bits are shorter and are intended for typical panel thicknesses, while the 70mm version is specifically designed for applications where additional depth capacity is needed to achieve the correct hinge cup bore position.
What shank size does this bit use, and is a driving flat included?
This bit uses a 10 x 26mm parallel shank. It includes a driving flat and a length adjusting screw. The driving flat prevents the shank from rotating in the chuck or spindle under load, while the length adjusting screw allows precise setting of the bore depth for consistent results across all hinge cup holes.
What does the PTFE coating on the spiral flutes do?
The PTFE coating on the spiral portion prevents pitch and glue buildup during drilling. This keeps the flutes clear so chips evacuate efficiently, reduces friction and heat, and helps the bit maintain cutting performance over extended use - particularly in materials like chipboard or MDF that can leave adhesive residue on tooling.
Is this bit compatible with both handheld drills and CNC boring machines?
Yes. The 10 x 26mm parallel shank with driving flat 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 that can accept a parallel shank. The bit is right-hand (RH) rotation, which matches all standard drive setups.
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