CMT Hinge Boring Bit 15 x 57.5mm Left-Hand 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 on boring machines equipped with adaptors or chucks, this left-hand rotation bit delivers the clean, accurate bores required for European-style concealed hinge installation. With a tungsten carbide (HW) head, negatively ground spurs, and a PTFE-coated cutter body, it is a reliable choice for woodworking shops running multi-spindle machines or CNC boring centers that demand consistent, chip-free results in solid wood, MDF, chipboard, and plywood.

Key Features

• Tungsten Carbide (HW) Head - the carbide-tipped cutting head maintains a sharp edge through repeated use in hardwood, softwood, MDF, and engineered panels, reducing downtime for tool changes.
• Super-Strength Steel Body with PTFE Coating - the cutter portion is coated with orange or black P.T.F.E., which resists pitch and resin buildup so the bit runs cleaner longer and requires less frequent cleaning between operations.
• Precision-Balanced Centre Point - the HW centre point is precision balanced to start the bore exactly on location without walking, producing accurately positioned hinge cup holes shot after shot.
• 2 Precision-Ground Cutting Edges (Z2) - two HW cutting edges work together to produce smooth, flat-bottom bores that seat European concealed hinges flush and squarely.
• 2 Negatively Ground Spurs (V2) - the negatively ground spurs sever wood fibres cleanly at the bore perimeter, delivering clean entry walls and minimizing tearout on finished cabinet faces.
• Left-Hand (LH) Rotation - purpose-built for left-hand spindle positions on multi-spindle boring machines, ensuring correct chip evacuation and cutting geometry on the appropriate machine station.
• 10 x 26mm Parallel Shank with Driving Flat and Length Adjusting Screw - the parallel shank design with a driving flat and length adjusting screw allows quick, secure mounting in adaptors or chucks and enables precise depth setting without additional tooling.

Why This Product

• The left-hand rotation designation makes this bit the correct tool for LH spindle positions on multi-spindle boring machines - using the wrong rotation direction causes poor cut quality and premature wear, so matching the bit to the spindle matters.
• The flat-bottom bore geometry produced by the precision-balanced centre point and two carbide cutting edges is specifically required for European concealed hinges - a rounded or imprecise bore prevents proper hinge cup seating and affects door alignment.
• PTFE coating on the cutter body reduces friction and pitch adhesion during repetitive production runs, meaning operators spend less time cleaning the bit and more time running parts.
• The 10 x 26mm parallel shank with driving flat and length adjusting screw simplifies setup on boring machines equipped with adaptors or chucks, allowing repeatable depth settings across production batches without elaborate fixturing.

Specifications

• Manufacturer Part Number: 317.150.12
• Brand: CMT Orange Tools
• Product Type: Hinge Boring Bit
• Diameter: 15mm
• Total Length: 57.5mm
• Shank: 10 x 26mm
• Rotation: Left-Hand (LH)
• Number of Cutting Edges: 2 (Z2)
• Number of Spurs: 2 (V2)
• Spur Geometry: Negatively ground spurs
• Head Material: HW (Tungsten Carbide)
• Body Material: Super-strength steel with P.T.F.E. coating

Approved Applications

• Drilling flat-bottom hinge cup holes in cabinet doors and face frames
• European concealed hinge installation
• Cabinet door hinge mounting on boring machines equipped with adaptors or chucks
• Panel processing in solid hardwood, softwood, chipboard, MDF, and plywood