CMT Hinge Boring Bit 22 x 57.5mm Left-Hand Rotation by CMT is a precision-engineered boring bit designed for drilling flat-bottom hinge cup holes in cabinet doors, face frames, and panel components. Built to the demands of European-style concealed hinge installation, this 22mm diameter bit delivers clean, accurate results in solid hardwood, softwood, MDF, chipboard, and plywood. With a left-hand (LH) rotation, it is purpose-matched to multi-spindle boring machines, CNC boring centers, and boring machines equipped with adaptors or chucks, making it a reliable choice for professional cabinetmakers and panel processing operations.

Key Features

• HW (Carbide) Cutting Head with Precision-Balanced Centre Point - the hard metal head stays centered on entry, reducing walking and producing repeatable hole placement across production runs.
• 2 HW Precision Ground Cutting Edges (Z2) - dual carbide cutting edges share the load evenly, extending tool life and maintaining flat-bottom hole geometry bore after bore.
• 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material perimeter cleanly before the main cutters engage, minimizing tearout and delivering smooth bore walls on veneered panels, MDF, and solid wood.
• Super-Strength Steel Body Coated with Orange or Black P.T.F.E. - the P.T.F.E. coating reduces friction and chip buildup in the flute area, helping the bit run cooler and clear waste material more efficiently during repeated drilling cycles.
• Parallel Shank (10 x 26mm) with Driving Flat and Length Adjusting Screw - the driving flat prevents shank slippage in the collet or adaptor, and the length adjusting screw allows precise depth setting on multi-spindle machines without shimming or guesswork.
• Left-Hand (LH) Rotation - engineered specifically for left-hand spindle positions on multi-spindle boring machines, ensuring correct cutting action and a clean flat-bottom hinge cup hole in the correct rotational direction.

Why This Product

• The 22mm diameter matches the industry-standard hinge cup size required for European concealed hinges, so the bit is ready for immediate use on door and face frame production without modification.
• The combination of a precision-balanced carbide centre point, 2 carbide cutting edges, and negatively ground spurs means the bit handles the full boring cycle - scoring, centering, and cutting - in a single plunge, reducing cycle time on panel processing equipment.
• The parallel shank with driving flat and length adjusting screw makes this bit practical on both dedicated multi-spindle boring machines with adaptors and on boring machines with standard chucks, giving it flexibility across different shop setups.
• The P.T.F.E.-coated super-strength steel body and HW cutting head together support extended production use in engineered sheet goods such as MDF and chipboard - materials that are notoriously abrasive to standard tool steel bits.

Specifications

• Manufacturer Part Number: 317.220.12
• Brand: CMT Orange Tools
• Diameter: 22mm
• Total Length: 57.5mm
• Shank: 10 x 26mm
• Rotation: LH (Left-Hand)
• Number of Spurs: 2
• Number of Teeth: 2
• Tooth Geometry: Negatively ground spurs
• Material: HW (Hard Metal / 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 mounting preparation
• Panel processing on CNC boring centers and multi-spindle machines
• Use on boring machines equipped with adaptors or chucks