Product Description
CMT Hinge Boring Bit 50 x 70mm Right-Hand is a long-series, carbide-tipped boring bit engineered specifically for drilling flat-bottom hinge cup holes in cabinet components. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this bit is the standard choice for European-style concealed hinge installation in solid hardwood, MDF, chipboard, plywood, and softwood. The spiral portion is coated with PTFE to resist pitch and glue buildup, keeping the cutting action clean and efficient across production runs. With a 10x26mm parallel shank featuring a driving flat and length adjusting screw, the bit seats securely in multi-spindle boring machines, CNC boring centers, and drill presses alike.
Key Features
- Tungsten Carbide (HW) Cutting Head - provides long-lasting edge retention when drilling abrasive sheet goods like MDF and chipboard, reducing the need for frequent tool changes.
- PTFE-Coated Spiral Flutes - the orange or black PTFE coating prevents pitch and adhesive buildup on the spiral portion, maintaining smooth chip evacuation and extending tool life during high-volume hinge cup drilling.
- Precision Balanced Centre Point - keeps the bit tracking on center from the first moment of contact, producing accurately positioned hinge cup holes without wandering or oversizing.
- 2 Precision-Ground Cutting Edges with Negatively Ground Spurs (Z2) - the negatively ground spur geometry scores the perimeter of the hole cleanly before the cutters remove material, delivering flat-bottom bores with crisp, tear-free edges on both faces of the workpiece.
- 50mm Boring Diameter - matches the standard cup size required for European concealed hinges, ensuring correct hinge cup geometry for proper door function and alignment.
- 70mm Total Length - Long Series - the extended body length accommodates thicker cabinet door panels and components where a standard-length bit would not reach full depth.
- 10x26mm Parallel Shank with Driving Flat and Length Adjusting Screw - the driving flat prevents shank rotation under load, while the length adjusting screw allows precise depth setting for consistent cup depth across all spindles on multi-bore machines.
- Right-Hand (RH) Rotation - compatible with all standard right-hand drill spindles, CNC boring heads, and handheld drills, making this bit a straightforward drop-in for conventional setups.
- Super-Strength Steel Body - resists flexing and vibration during high-feed-rate drilling, maintaining positional accuracy and bore quality even under production conditions.
Why This Product
- The 70mm long-series length makes this bit the correct choice when boring hinge cup holes in thicker cabinet door panels or frame components where a short-series bit cannot achieve the required depth - no adapter or extension needed.
- The combination of a carbide cutting head and PTFE-coated spiral addresses the two most common causes of hinge boring bit failure - edge wear and chip packing - in a single tool, keeping production lines moving with minimal interruption.
- Negatively ground spurs and a precision balanced centre point work together to produce the clean, flat-bottomed 50mm cup that European concealed hinges require for full seating depth and correct door overlay geometry.
- The parallel shank with driving flat and length adjusting screw makes this bit compatible with multi-spindle CNC boring machines and boring centers where repeatable depth control across every spindle is critical to consistent cabinet assembly.
Specifications
- Manufacturer Part Number: 369.500.11
- Brand: CMT Orange Tools
- Diameter: 50mm
- Total Length: 70mm
- Shank: 10x26mm
- Rotation: Right-Hand (RH)
- Number of Teeth: 2
- Number of Spurs: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: Tungsten Carbide (HW)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinge installation
- Cabinet door hinge cup boring in solid hardwood panels
- Hinge cup drilling in MDF cabinet doors and components
- Boring hinge cups in chipboard and plywood cabinetry
- Softwood door and frame hinge boring
- Production hinge boring on multi-spindle CNC boring machines and panel processing centers
Frequently Asked Questions
What shank size does this hinge boring bit use, and what machines is it compatible with?
This bit uses a 10x26mm parallel shank with a driving flat and length adjusting screw. That shank configuration is compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, boring machines with an adapter or chuck, drill presses, and handheld drills that accept a parallel shank.
What is the difference between this 70mm long-series bit and a shorter hinge boring bit?
The 70mm total length is a long-series dimension designed for boring flat-bottom hinge cup holes in thicker cabinet door panels and components. Where a shorter bit would bottom out in the chuck before reaching full cup depth in a thick workpiece, the extended 70mm length provides the clearance needed without adapters or extensions.
Why does this bit have a PTFE coating on the spiral flutes?
The spiral portion is coated with PTFE (available in orange or black) to prevent pitch, resin, and adhesive from bonding to the flute surfaces. This keeps the flutes clear during drilling, promotes consistent chip evacuation, and extends the service life of the bit - particularly important during high-volume hinge cup boring operations.
What is the purpose of the negatively ground spurs on this hinge boring bit?
The 2 negatively ground spurs score the perimeter of the bore before the main cutting edges remove material. This shearing action defines a clean circle on the workpiece surface, preventing surface tearout and producing the crisp, flat-bottomed 50mm cup that European concealed hinges require for correct seating and operation.
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