CMT Hinge Boring Bit - 55mm x 57.5mm Right-Hand Rotation by CMT is a precision-engineered carbide-tipped boring bit designed for drilling flat-bottom hinge cup holes in cabinet doors, face frames, and panel components. Built 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 tungsten carbide (HW) cutting head, PTFE-coated body, and negatively ground spurs work together to produce accurate, chip-free results in solid wood, sheet goods, and composite panel materials.

Key Features

• HW (Tungsten Carbide) Cutting Head with Precision Balanced Centre Point - the carbide tip maintains cutting accuracy over extended production runs, reducing the need for frequent tool changes and keeping bores centered and consistent.
• 2 HW Precision Ground Cutting Edges (Z2) - dual cutting edges distribute the cutting load evenly, resulting in smooth flat bottoms and reduced tear-out on the bore floor.
• 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the perimeter of the bore before the cutters enter, producing clean, crisp edges and preventing surface splintering on veneered or laminated panels.
• Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black PTFE, which resists pitch and resin buildup, reducing friction and extending the usable life of the bit between sharpenings.
• Parallel Shank (10x26mm) with Driving Flat and Length Adjusting Screw - the parallel shank design with driving flat ensures secure, slip-free seating in machine adaptors or chucks, while the length adjusting screw allows precise depth calibration for consistent hinge cup depth across production runs.
• Right-Hand (RH) Rotation - matched to standard boring machine spindle direction, ensuring compatibility with conventional multi-spindle CNC boring machines and boring centers without the need for special configuration.

Why This Product

• The flat-bottom bore geometry is specifically required for European concealed hinge cups - this bit is purpose-built for that application, eliminating the guesswork of adapting general-purpose drill bits to cabinetry hinge work.
• The negatively ground spur configuration protects veneered, laminated, or finished panel faces from tear-out, making this bit well-suited for cabinet door production where surface quality at the hinge cup opening is critical.
• The 10x26mm parallel shank with driving flat and length adjusting screw makes this bit a direct fit for boring machines equipped with adaptors or chucks, allowing fast, repeatable setup with minimal adjustment time between operations.
• PTFE coating on the cutter portion actively resists pitch and resin adhesion during drilling, keeping the tool running cleanly through chipboard, MDF, and solid wood without the performance degradation caused by buildup.

Specifications

• Manufacturer Part Number: 317.550.11
• Brand: CMT Orange Tools
• Diameter: 55mm
• Total Length: 57.5mm
• Shank: 10x26mm
• Rotation: Right-Hand (RH)
• Number of Cutting Edges: 2
• Number of Spurs: 2
• Tooth Geometry: Negatively ground spurs
• Material: HW (Tungsten Carbide)
• Product Type: Hinge Boring Bit

Approved Applications

• Drilling flat-bottom hinge cup holes in cabinet doors and face frames
• European concealed hinge installation
• Cabinet door hinge mounting in production and custom shop environments
• Panel processing in solid hardwood, softwood, chipboard, MDF, and plywood