CMT Hinge Boring Bit 25 x 70mm Right-Hand is a long-series boring bit engineered for drilling clean, flat-bottom hinge cup holes in cabinet components requiring greater boring depth. Built by CMT on a super-strength steel body with a tungsten carbide (HW) head, this bit is the correct choice for installing European-style concealed hinges in thicker panels, frame components, and cabinet doors. The P.T.F.E.-coated spiral flutes resist pitch and resin buildup, keeping the cutting action smooth and the tool running longer between cleanings. With a parallel 10 x 26mm shank featuring a driving flat and a length-adjusting screw, this bit is compatible with multi-spindle boring machines, CNC boring centers, panel processing equipment, and drill presses fitted with an appropriate adapter or chuck.

Key Features

• Tungsten Carbide (HW) Head on Super-Strength Steel Body - the carbide cutting head delivers lasting edge retention through dense materials like chipboard, MDF, and hardwood, while the steel body absorbs vibration and maintains rigidity during deep boring operations.
• P.T.F.E.-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion prevents pitch, adhesive, and resin from adhering to the flutes, reducing cleaning downtime and extending the usable life of the bit.
• Precision-Balanced Centre Point - ensures the bit registers accurately at the start of each bore, reducing wander and producing consistently centered hinge cup holes without requiring a pilot hole.
• 2 Precision-Ground Cutting Edges with Negatively Ground Spurs (Z2) - the negatively set spurs score the material cleanly ahead of the cutting edges, producing smooth bore walls and a flat bottom with no tear-out on the face surface.
• 2 Spiral Flutes - efficiently evacuate chips from deep bores, preventing packing and overheating that can degrade cut quality and shorten tool life.
• Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 26mm parallel shank locks securely in boring machine spindles and allows precise depth setting, making it straightforward to achieve consistent hinge cup depth across a full production run.
• Right-Hand (RH) Rotation - matched to standard boring machine and drill spindle rotation, ensuring immediate compatibility without spindle reversal or special toolholders.
• 70mm Total Length - the extended length provides the reach needed to bore hinge cup holes in thicker cabinet door stiles and frame members where a standard-length bit would not reach full depth safely.

Why This Product

• The 25mm diameter is the industry-standard cup size for European concealed hinges, making this bit the direct solution for cabinetmakers who need to produce hinge cup holes that accept 35mm hinge cups without modification or fitment adjustments.
• The 70mm total length is specifically suited for boring into thicker cabinet door components where shorter hinge boring bits cannot achieve the required depth - eliminating the need for extensions or workarounds on the machine.
• The combination of a carbide head and P.T.F.E.-coated flutes means the bit holds its edge longer and stays cleaner during production runs through chipboard, MDF, plywood, and solid wood - reducing interruptions for tool changes or cleaning.
• The parallel shank with a driving flat and length-adjusting screw makes depth setting fast and repeatable, which is critical in high-volume cabinet production where every hinge cup must land at the same depth across dozens or hundreds of doors.

Specifications

• Manufacturer Part Number: 369.250.11
• Brand: CMT Orange Tools
• Diameter: 25mm
• Total Length: 70mm
• Shank: 10 x 26mm
• Rotation: Right-Hand (RH)
• Number of Teeth: 2
• Spurs: 2
• Tooth Geometry: Negatively ground spurs
• Blade Material: HW (Tungsten Carbide)
• Product Type: Hinge Boring Bit

Approved Applications

• Drilling flat-bottom hinge cup holes for European-style concealed hinges
• Cabinet door hinge cup boring
• Hinge mortise preparation in thicker cabinet door stiles and frame components
• Production boring of 25mm hinge cup holes in solid hardwood, softwood, chipboard, MDF, and plywood