Product Description
CMT Hinge Boring Bit 18 x 57.5mm Right-Hand by CMT is a professional-grade boring tool engineered for drilling flat-bottom hinge cup holes in cabinet doors and face frames. Precision-built for European-style concealed hinge installation, this 18mm carbide-tipped bit delivers clean, accurate bores in solid wood, sheet goods, and engineered panel materials. Designed for use in boring machines equipped with adaptors or chucks, it combines a hardmetal (HW) cutting head, negatively ground spurs, and a PTFE-coated body to produce consistent, splinter-free results across high-volume cabinet production and millwork applications.
Key Features
- Hardmetal (HW) cutting head with precision balanced centre point - the carbide tip stays on-center during entry, eliminating bit walk and ensuring accurate hole placement for repeatable concealed hinge installation.
- 2 HW precision ground cutting edges (Z2) - dual carbide edges distribute cutting load evenly, extending edge life and maintaining a flat-bottom bore profile required by European hinge cups.
- 2 negatively ground spurs (V2) - score the perimeter of the bore before the cutters engage, producing clean walls and crisp entry points that reduce tearout on veneered panels, MDF, and chipboard.
- Super-strength steel body with PTFE coating on the cutter portion - the orange or black PTFE finish resists pitch and adhesive buildup, reducing heat and friction so the bit clears chips freely and lasts longer between cleanings.
- Parallel shank (10 x 26mm) with driving flat and length adjusting screw - the driving flat prevents shank slippage under torque, and the adjusting screw allows fine depth-setting in boring machine chucks and adaptors for consistent hole depth across every panel.
- Right-hand (RH) rotation - matches the standard spindle direction of multi-spindle boring machines, CNC boring centers, and drill presses, making it a drop-in fit for most cabinet shop setups.
- 18mm bore diameter - the industry-standard size for 35mm European concealed hinge cups, ensuring proper hinge cup seating without additional sizing or adjustment.
Why This Product
- Purpose-built geometry for European hinge installation - the flat-bottom bore profile produced by the HW head is a hard requirement for 35mm concealed hinge cups; a conventional twist drill or brad-point bit cannot produce the geometry this application demands.
- Reduces surface damage on finished panels - the negatively ground spurs pre-score the material boundary before the carbide cutters advance, which is especially valuable when working with pre-finished cabinet doors, veneered plywood, or melamine-faced chipboard where tearout means a rejected part.
- Parallel shank with driving flat locks position under load - in high-cycle boring machine use, shank slippage causes misaligned holes and scrapped doors; the flat-and-screw retention system keeps the bit firmly positioned even during continuous production runs.
- PTFE-coated body minimizes downtime - pitch, resin, and glue adhesion are leading causes of premature bit wear and reduced cut quality; the PTFE surface release coating keeps the flutes clear so the bit performs consistently from the first hole to the last.
Specifications
- Manufacturer Part Number: 317.180.11
- Brand: CMT Orange Tools
- Diameter: 18mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: Right-Hand (RH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Material: HW (Hardmetal / Carbide-Tipped)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinges
- Cabinet door hinge mounting and face frame boring
- Panel processing in multi-spindle CNC boring machines and boring centers
- Boring machine use with adaptors or chucks
- Solid hardwood and softwood cabinet components
- Chipboard and particleboard panel goods
- MDF (medium-density fiberboard)
- Plywood and veneered sheet materials
Frequently Asked Questions
What machines is this hinge boring bit compatible with?
This bit is designed for use in boring machines equipped with adaptors or chucks. The 10 x 26mm parallel shank features a driving flat and a length adjusting screw, which allow secure mounting and precise depth setting in multi-spindle CNC boring machines, boring centers, panel processing centers, and drill presses configured with an appropriate chuck or adaptor.
Why does this hinge boring bit use negatively ground spurs?
The 2 negatively ground spurs (V2) score the perimeter of the bore before the main cutting edges engage the material. This pre-scoring action severs surface fibers cleanly, minimizing tearout and producing smooth, crisp bore walls - a particularly important quality when working with veneered, pre-finished, or melamine-coated panels where a ragged entry edge would render the workpiece unusable.
What is the purpose of the PTFE coating on the cutter portion?
The orange or black PTFE coating applied to the cutter portion of this bit resists the adhesion of pitch, resin, and glue that naturally accumulate during wood boring operations. By preventing buildup on the cutting edges and body, the PTFE surface helps maintain cut quality, reduces heat from friction, and extends the working life of the bit between sharpenings or replacements.
Is this bit suitable for left-hand spindle machines?
No. This bit is a right-hand (RH) rotation tool. It is intended exclusively for machines that run a standard right-hand (clockwise when viewed from the shank end) spindle direction. For left-hand spindle applications, a dedicated left-hand (LH) rotation hinge boring bit is required to ensure proper cutting action and safe operation.
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