CMT 317.500.11 Hinge Boring Bit - 50 x 57.5mm Right-Hand by CMT is a precision-engineered hinge cup boring bit designed for drilling flat-bottom holes required by European-style concealed hinges in cabinet doors and face frames. Built with a tungsten carbide (HW) cutting head, 2 precision-ground cutting edges, and 2 negatively ground spurs, this 50mm diameter bit delivers clean, accurate hinge cup bores in solid wood, panel products, and composite sheet materials. Compatible with boring machines equipped with adaptors or chucks, it is the right-hand rotation tool of choice for cabinetmakers and woodworking professionals running multi-spindle or CNC boring equipment.

Key Features

• HW (Tungsten Carbide) Cutting Head with Precision Balanced Centre Point - the carbide head stays sharp longer than high-speed steel alternatives, and the balanced centre point keeps the bit on target for accurate, repeatable hole placement in production runs.
• 2 HW Precision-Ground Cutting Edges (Z2) - dual carbide cutting edges distribute cutting load evenly, reducing heat buildup and extending bit life when boring high volumes of hinge cup holes.
• 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material perimeter before the cutters remove waste, producing clean bore walls and a flat-bottom hole profile required for proper European concealed hinge seating.
• Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black P.T.F.E., which prevents pitch and glue buildup during use so the bit clears chips freely and maintains cutting performance without frequent cleaning stops.
• Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 26mm parallel shank seats securely in boring machine adaptors or chucks, while the driving flat prevents slipping under load and the length adjusting screw allows precise depth setting for consistent hinge cup depth across every door.
• Right-Hand (RH) Rotation - matched to standard boring machine spindle direction, ensuring correct cutting geometry and spur scoring action for clean entry and a flat hinge cup bottom.

Why This Product

• The flat-bottom hole geometry produced by the negatively ground spurs and carbide cutting edges is specifically required for European concealed hinge installation - a standard round-bottom drill bit cannot produce the seating geometry these hinges demand.
• The 10 x 26mm parallel shank with driving flat and length adjusting screw makes this bit directly compatible with boring machines equipped with adaptors or chucks, fitting seamlessly into multi-spindle CNC boring centers and panel processing equipment without additional modification.
• The combination of a tungsten carbide (HW) head and PTFE-coated steel body addresses two common production problems at once - premature edge wear and resin buildup - making this bit well-suited for high-cycle cabinet door production in chipboard, MDF, and hardwood.
• At 50mm diameter, this bit matches the most widely used European concealed hinge cup size, making it a practical standard-specification tool for shops building face-frame and frameless cabinets with 35mm European hinge hardware.

Specifications

• Manufacturer Part Number: 317.500.11
• Brand: CMT Orange Tools
• Diameter: 50mm
• Total Length: 57.5mm
• Shank: 10 x 26mm
• Rotation: RH (Right-Hand)
• Number of Spurs: 2
• Number of Teeth: 2
• Sharpening: Negatively ground spurs
• Material: HW (Tungsten Carbide)

Approved Applications

• Drilling flat-bottom hinge cup holes for European-style concealed hinges
• Cabinet door hinge cup boring
• Face frame hinge mounting preparation
• Panel processing on boring machines equipped with adaptors or chucks