Product Description
CMT Hinge Boring Bit 26 x 57.5mm Right-Hand by CMT is a precision-engineered boring tool designed for drilling flat-bottom hinge cup holes in cabinet doors and face frames. Purpose-built for European-style concealed hinge installation, this 26mm diameter bit delivers clean, accurate bores in solid hardwood, softwood, MDF, chipboard, and plywood. Compatible with boring machines equipped with adaptors or chucks, it is the go-to choice for cabinetmakers and woodworking professionals who demand consistent results in panel processing and door hinge mounting applications.
Key Features
- Tungsten carbide (HW) cutting head with precision-balanced centre point - maintains accurate bore positioning from the first contact, reducing tear-out and improving hole-to-hole consistency across production runs.
- 2 precision-ground HW cutting edges (Z2) - dual carbide edges distribute cutting load evenly, extending edge life and producing a flat, smooth bore bottom required for European concealed hinge seating.
- 2 negatively ground spurs (V2) - score the perimeter of the bore cleanly before the cutters engage, resulting in crisp, chip-free entry holes in both hardwood and engineered panels.
- Super-strength steel body with PTFE coating - the orange or black PTFE finish on the cutter portion resists pitch and adhesive buildup, reducing friction and keeping the bit cutting freely during high-volume boring operations.
- Parallel shank (10 x 26mm) with driving flat and length-adjusting screw - secure, slip-free engagement in machine adaptors or chucks, with field-adjustable boring depth for fast, repeatable setup changes.
- Right-hand (RH) rotation - matches standard boring machine spindle direction for direct, no-adapter installation on conventional equipment.
Why This Product
- The 26mm cutting diameter matches the industry-standard hinge cup size used by European concealed hinge systems, making this bit a direct fit for cabinet door hinge installation without modification or custom setup.
- The combination of negatively ground spurs and precision carbide cutting edges produces flat-bottom holes with clean wall surfaces - the exact geometry needed for concealed hinges to seat flush and function correctly.
- The length-adjusting screw on the parallel shank allows boring depth to be dialed in precisely at the machine, reducing setup time when switching between door thicknesses or hinge cup depths in production environments.
- PTFE coating on the cutter portion actively resists adhesive and resin buildup from engineered wood panels like MDF and chipboard, keeping the bit performing cleanly through extended use without frequent cleaning stops.
Specifications
- Manufacturer Part Number: 317.260.11
- Brand: CMT Orange Tools
- Diameter: 26mm
- 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 (Tungsten Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge mounting
- Face frame boring for concealed hinges
- Panel processing on boring machines equipped with adaptors or chucks
- Hinge cup boring in solid hardwood, softwood, MDF, chipboard, and plywood
Frequently Asked Questions
What machines is this hinge boring bit compatible with?
This bit is designed for boring machines equipped with adaptors or chucks. The parallel shank with driving flat and length-adjusting screw ensures secure, accurate engagement in these machine configurations.
Why does the hinge cup hole need a flat bottom?
European-style concealed hinges require a flat-bottom hinge cup hole to seat correctly and function as designed. This bit's carbide cutting head geometry - with 2 precision-ground cutting edges and 2 negatively ground spurs - produces the flat-bottom bore that these hinges require for proper installation and alignment.
What is the purpose of the PTFE coating on the cutter portion?
The orange or black PTFE coating applied to the cutter portion of the bit prevents pitch and glue buildup during cutting. This is especially beneficial when boring engineered panels such as MDF and chipboard, where adhesive resins can accumulate on cutting tools and reduce performance over time.
Can the boring depth be adjusted on this bit?
Yes. The parallel shank includes both a driving flat and a length-adjusting screw, allowing the operator to set and fine-tune boring depth at the machine. This makes it straightforward to adapt to different hinge cup depth requirements without changing tooling.
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