Product Description
CMT Hinge Boring Bit 22 x 57.5mm Right-Hand by CMT is a precision carbide-tipped boring bit engineered for drilling flat-bottom hinge cup holes in cabinet doors, face frames, and panel components. Designed for European-style concealed hinge installation, this 22mm diameter bit delivers consistently clean bores with flat bottoms - the geometry required for 35mm Euro hinge cups and similar concealed hinge hardware. With a right-hand (RH) rotation and a 10x26mm parallel shank featuring a driving flat and length adjusting screw, it is compatible with boring machines equipped with adaptors or chucks, making it a dependable choice for production cabinetry, panel processing, and woodworking shops that demand repeatable accuracy.
Key Features
- HW (Carbide) Head with Precision Balanced Centre Point - the hardmetal carbide tip stays on-centre during plunge entry, reducing wander and ensuring accurate hole positioning across repeated operations.
- 2 HW Precision Ground Cutting Edges (Z2) - dual carbide cutting edges distribute load evenly, extending tool life and producing flat, consistent bore bottoms required for European concealed hinge cups.
- 2 Negatively Ground Spurs (V2) - negatively ground spurs score the perimeter of the hole before the cutters clear the material, minimizing tearout and delivering clean bore walls in both solid wood and engineered panels.
- Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black P.T.F.E., reducing friction and heat buildup so the bit runs cooler and material does not bond or burn to the tool surface.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x26mm shank locks securely in boring machine adaptors or chucks, and the adjusting screw allows precise depth setting for consistent hinge cup depth across production runs.
- Right-Hand (RH) Rotation - matches the standard rotation direction of multi-spindle boring machines, CNC boring centers, and drill presses, enabling direct drop-in use without spindle reconfiguration.
Why This Product
- The flat-bottom bore geometry produced by this bit is specifically required for European concealed hinge installation - without a truly flat bottom, hinge cups seat improperly and doors misalign, making this bit the correct tool for the job rather than a general-purpose forstner or brad-point bit.
- The negatively ground spurs score the wood fiber ahead of the cutters, which is especially valuable when boring through veneered panels, MDF, or chipboard where tearout at the bore rim would be visible or would compromise hinge cup seating.
- The carbide (HW) cutting head is designed to withstand the abrasive nature of chipboard, MDF, and plywood - materials that rapidly dull high-speed steel tooling - making this bit suited for production environments where those substrates are processed in volume.
- The parallel shank with driving flat and length adjusting screw provides a secure, repeatable fit in boring machine adaptors or chucks, supporting consistent depth control across a full production run without manual re-measurement at each setup.
Specifications
- Manufacturer Part Number: 317.220.11
- Brand: CMT Orange Tools
- Diameter: 22mm
- Total Length: 57.5mm
- Shank: 10x26mm
- Rotation: RH (Right-Hand)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Material: HW (Hardmetal Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinge installation
- Cabinet door hinge cup boring
- Face frame hinge mortise boring
- Panel processing on boring machines equipped with adaptors or chucks
- Boring in solid hardwood and softwood
- Boring in chipboard, MDF, and plywood
Frequently Asked Questions
What type of machine does this hinge boring bit require?
This bit is designed for boring machines equipped with adaptors or chucks. The 10x26mm parallel shank with a driving flat is intended to seat securely in such machines, allowing precise depth adjustment via the integrated length adjusting screw.
Why are negatively ground spurs important for hinge cup boring?
Negatively ground spurs score the perimeter of the bore before the carbide cutting edges clear the material. This scribing action severs wood fibers cleanly at the rim of the hole, reducing tearout and producing a clean bore wall - which is important when working with veneered panels, MDF, or chipboard where a ragged bore edge can affect hinge cup seating and finished appearance.
Is this bit suitable for use in MDF and chipboard, or only solid wood?
Yes. The HW (hardmetal carbide) cutting head is well suited for engineered panels including chipboard, MDF, and plywood, in addition to solid hardwood and softwood. Carbide resists the abrasive silica and adhesive content in these manufactured board materials far better than high-speed steel tooling.
What does the PTFE coating on this bit do?
The cutter portion is coated with orange or black P.T.F.E., which reduces friction between the bit and the workpiece material during boring. Lower friction means less heat buildup at the cutting edges, which helps protect the carbide tip and reduces the likelihood of material residue bonding or burning onto the bit surface during repetitive production use.
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