Product Description
CMT Hinge Boring Bit 30 x 70mm Right-Hand by CMT is a long-series, carbide-tipped boring bit engineered for drilling precise flat-bottom hinge cup holes required by European-style concealed hinges. With a 30mm cutting diameter and 70mm total length, this bit reaches deeper into cabinet panels and thicker door components where standard-length boring bits fall short - making it the right choice for demanding cabinetry and panel processing work. The parallel 10x26mm shank with driving flat and length-adjusting screw allows secure, repeatable positioning in multi-spindle CNC boring machines, boring centers, and drill presses alike.
Key Features
- Tungsten Carbide (HW) Cutting Head - the carbide-grade head holds a sharper edge longer than standard high-speed steel bits, reducing the frequency of tool changes during high-volume hinge cup drilling operations.
- Negatively Ground Spurs (2 spurs) - the inward-facing spur geometry slices cleanly through wood fibers on the bore perimeter before the main cutters remove material, producing crisp, tear-free walls and a flat hinge cup bottom.
- 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges balance the cutting load across the bit, helping maintain bore roundness and a consistent 30mm diameter even in dense hardwoods and composite panel materials.
- P.T.F.E.-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion prevents pitch and adhesive buildup, allowing chips and sawdust to evacuate freely and extending overall tool service life.
- Super-Strength Steel Body - the steel shank and spiral body resist flexing under lateral load, helping maintain bore straightness and perpendicularity through the full 70mm drilling depth.
- Parallel 10x26mm Shank with Driving Flat and Length-Adjusting Screw - the driving flat prevents shank rotation under torque, while the length-adjusting screw sets drilling depth consistently from hole to hole - critical when installing European hinges that require uniform cup depth.
- Right-Hand (RH) Rotation - matches the standard spindle rotation direction of CNC boring machines, boring centers, and conventional drill presses, so no adapter or reversed-rotation spindle is needed.
Why This Product
- The 70mm total length puts this bit in the long-series category, making it well suited for thicker cabinet door panels and face-frame components where a standard 57mm series bit cannot reach adequate depth without the chuck fouling the workpiece surface.
- The combination of a carbide (HW) cutting head with negatively ground spurs addresses two common hinge-boring problems at once - edge tearout and premature cutting-edge wear - in a single tool designed specifically for flat-bottom hinge cup geometry.
- The P.T.F.E.-coated flutes reduce resin and glue buildup when boring through MDF, chipboard, and adhesive-bonded plywood, keeping the bit cutting cleanly without frequent stoppages to clear packed material from the flutes.
- The parallel shank with length-adjusting screw enables consistent, repeatable boring depth across an entire production run - important when the concealed hinge cup depth tolerance directly affects door alignment and closing performance.
Specifications
- Manufacturer Part Number: 369.300.11
- Brand: CMT Orange Tools
- Diameter: 30mm
- Total Length: 70mm
- Shank: 10x26mm
- Rotation: Right-Hand (RH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Product Type: Hinge Boring Bit
- Series: Hinge Boring Bit 70mm
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinges
- Cabinet door hinge cup boring in thicker panel components
- European concealed hinge installation in solid hardwood doors
- Hinge cup boring in softwood cabinet components
- Flat-bottom hole boring in MDF panels
- Hinge cup drilling in chipboard and particleboard
- Plywood cabinet door hinge mortising
- Multi-spindle CNC boring machine operations
- CNC boring center panel processing
- Drill press hinge cup boring with parallel shank adapter
Frequently Asked Questions
What is the difference between this 70mm series hinge boring bit and a standard-length hinge boring bit?
This bit has a 70mm total length, placing it in the long-series category. The additional length allows the bit to reach full hinge cup depth in thicker cabinet components without the chuck or drill nose contacting the workpiece surface - a limitation that can occur with shorter-series bits on panels above standard thickness.
What does "negatively ground spurs" mean and why does it matter for hinge cup boring?
Negatively ground spurs are oriented so that the spur edge angles inward toward the bore center. This geometry scores and severs wood fibers at the perimeter of the 30mm bore before the main cutting edges remove material, producing clean hole walls and a flat bottom with minimal tearout - both critical for a proper fit with European concealed hinge hardware.
What does the P.T.F.E. coating on the spiral do?
The P.T.F.E. coating applied to the spiral flute portion prevents pitch, resin, and adhesive residue from bonding to the bit surface. This keeps the flutes clear for chip evacuation during boring, reduces friction heat, and extends the usable life of the tool - particularly when working with MDF, chipboard, or adhesive-laminated panel materials.
Is this bit compatible with handheld drills as well as CNC boring machines?
Yes. The parallel 10x26mm shank with driving flat 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. The length-adjusting screw on the shank allows precise depth setting regardless of the machine used.
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