CMT Hinge Boring Bit - 40mm Diameter, 57.5mm Total Length, Right-Hand Rotation is a precision carbide-tipped boring bit engineered for drilling flat-bottom hinge cup holes in cabinet doors, face frames, and panel components. Designed by CMT for use with boring machines equipped with adaptors or chucks, this right-hand rotation bit delivers the clean, flat-bottomed bores required for European-style concealed hinge installation. The 10x26mm parallel shank with driving flat and length adjusting screw makes setup straightforward and repeatable across a wide range of machine configurations.

Key Features

• Tungsten Carbide (HW) Cutting Head with Precision Balanced Centre Point - the carbide head stays sharp longer than standard steel, reducing downtime between sharpenings and delivering consistent bore quality across high-volume production runs.
• 2 Precision Ground HW Cutting Edges (Z2) - dual carbide cutting edges produce a clean, flat bore bottom on every pass, which is essential for proper seating of European concealed hinges.
• 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material cleanly before the cutters engage, minimizing tearout and producing smooth bore walls in solid wood, chipboard, MDF, and plywood.
• PTFE-Coated Cutter Portion (Orange or Black Coating) - the polytetrafluoroethylene coating on the cutter portion prevents pitch and glue buildup, keeping the bit running freely and extending tool life in resinous or adhesive-laden materials.
• Super-Strength Steel Body - the robust steel construction handles the lateral and axial forces of repeated boring cycles without flex, maintaining bore diameter accuracy across production volumes.
• Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x26mm parallel shank design allows quick, secure installation in machine adaptors or chucks, and the adjusting screw enables precise depth setting without additional tooling.
• Right-Hand Rotation - matches the standard spindle direction of the vast majority of boring machines and drill presses, making this bit a direct drop-in for most shop setups.

Why This Product

• The flat-bottom bore geometry produced by the precision balanced centre point and dual carbide cutting edges is specifically required for European concealed hinge cups - this is not a general-purpose forstner bit, but a dedicated hinge boring tool built to meet that exacting requirement.
• The negatively ground spur configuration minimizes surface tearout when boring through veneered panels, MDF, and chipboard - materials that are common in cabinet and furniture production where clean entry and exit are critical to finished appearance.
• The PTFE coating on the cutter portion actively resists pitch and adhesive deposits, making this bit well suited for composite panel materials and manufactured wood products where resin content can quickly foul uncoated tools.
• The parallel shank with driving flat and length adjusting screw is compatible with boring machines equipped with adaptors or chucks, giving this bit broad machine compatibility for cabinet shops running a variety of equipment configurations.

Specifications

• Manufacturer Part Number: 317.400.11
• Brand: CMT Orange Tools
• Diameter: 40mm
• Total Length: 57.5mm
• Shank: 10x26mm
• Rotation: RH (Right-Hand)
• Number of Spurs: 2
• Number of Teeth: 2
• Sharpening: 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 cup boring
• Face frame hinge mounting preparation
• Panel processing in cabinet and furniture manufacturing
• Boring in solid hardwood
• Boring in softwood
• Boring in chipboard
• Boring in MDF
• Boring in plywood