Product Description
CMT Hinge Boring Bit 22 x 70mm Right-Hand by CMT is a long-series carbide-tipped boring bit engineered specifically for drilling clean, flat-bottom hinge cup holes required by European-style concealed hinges. With a 22mm cutting diameter and 70mm total length, this bit reaches deeper into thicker cabinet panels and door stiles than standard-length alternatives, making it well suited for multi-spindle CNC boring machines, boring centers, and drill presses where precision hinge pocket placement is critical. The parallel 10 x 26mm shank with a driving flat and length-adjusting screw ensures secure, repeatable positioning, while the HW (carbide) cutting head with 2 precision-ground cutting edges and negatively ground spurs produces smooth bore walls and cleanly defined flat bottoms on every pass through solid hardwood, chipboard, MDF, plywood, and softwood.
Key Features
- Super-strength steel body - provides a rigid backbone that resists deflection during high-cycle cabinet production, maintaining bore accuracy over extended use.
- HW (carbide) cutting head - delivers long-lasting edge retention in abrasive sheet goods like chipboard and MDF, reducing the frequency of tool changes on the line.
- 2 precision-ground cutting edges (Z2) with negatively ground spurs - shear material cleanly at the bore perimeter, preventing chip-out and producing smooth, splinter-free entry walls that seat concealed hinge cups flush every time.
- 2 spiral flutes - evacuate chips efficiently from the bore as the bit advances, reducing heat buildup and keeping the cutting zone clear for a cleaner, more consistent flat-bottom hole.
- Precision balanced centre point - starts on mark without walking, keeping the 22mm cup hole centered on its layout point for accurate hinge alignment and door swing geometry.
- Spiral portion coated with P.T.F.E. - reduces friction along the flute, making chip evacuation smoother and lowering cutting resistance in dense hardwoods and composite panel materials.
- Parallel 10 x 26mm shank with driving flat and length-adjusting screw - locks securely in boring machine chucks and adapters while allowing precise depth pre-setting so every hinge cup is bored to a consistent depth across an entire run of cabinet doors.
- Right-hand (RH) rotation - matches the standard spindle direction of European-style multi-boring machines and CNC boring centers, ensuring immediate compatibility without spindle reversal.
- 22mm cutting diameter x 70mm total length (long series) - the extended length reaches into deeper panels and thicker stile profiles where standard-length boring bits cannot achieve full depth, opening up a wider range of cabinet construction options.
Why This Product
- Built for European concealed hinge installation - the 22mm diameter and flat-bottom geometry match the cup-hole specification required by European concealed hinges, eliminating fitment issues and reducing adjustment time during door hanging.
- Long-series reach for thicker cabinet components - at 70mm total length, this bit handles deeper boring requirements in solid-wood frames and thicker panel stiles that would bottom out a shorter bit before reaching full cup depth.
- Carbide cutting head with negatively ground spurs for surface-quality boring - the HW head and precision spur geometry work together to minimize tear-out in veneered panels, chipboard faces, and hardwood door blanks, keeping finished surfaces clean without secondary clean-up.
- Shank design supports production-rate accuracy - the driving flat, length-adjusting screw, and parallel 10 x 26mm shank allow the bit to be pre-set and locked into position quickly on CNC boring centers and multi-spindle machines, supporting consistent throughput in a production cabinet shop environment.
Specifications
- Manufacturer Part Number: 369.220.11
- Brand: CMT Orange Tools
- Diameter: 22mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Rotation: Right-hand (RH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Blade Material: HW (carbide-tipped)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European concealed hinges
- Cabinet door hinge cup boring
- Hinge pocket machining in thicker cabinet components and solid-wood door stiles
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center production runs
- Boring machine operations with adapter or chuck
- Drill press hinge cup drilling
- Handheld drill operations with parallel-shank compatible models
Frequently Asked Questions
What materials can this hinge boring bit cut through?
This bit is designed for use in solid hardwood, softwood, chipboard, MDF, and plywood - the most common materials used in cabinet door and panel construction where European concealed hinges are installed.
What is the difference between this long-series 70mm bit and a standard-length hinge boring bit?
The 70mm total length gives this bit additional reach, allowing it to bore to full depth in thicker cabinet panels and solid-wood door stiles where a shorter bit would bottom out in its chuck or adapter before the cutting head reaches the required cup depth.
Why does this bit have negatively ground spurs, and how does that affect the bore quality?
Negatively ground spurs slice the wood fibers at the perimeter of the bore before the main cutting edges remove the core material. This shearing action prevents tear-out and chip-out at the bore rim, producing clean, smooth bore walls that allow the hinge cup to seat flush with no rough edges interfering with fit.
What shank size and type does this bit use, and what machines accept it?
The bit uses a parallel 10 x 26mm shank with a driving flat and a length-adjusting screw. This shank profile is compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, boring machines fitted with an appropriate adapter or chuck, drill presses, and handheld drills capable of accepting parallel-shank tooling.
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