Product Description
CMT Hinge Boring Bit 19 x 57.5mm Right-Hand by CMT is a precision-engineered flat-bottom boring bit designed for drilling hinge cup holes in cabinet doors and face frames. Built for European-style concealed hinge installation, this 3/4 in. diameter bit features a tungsten carbide (HW) head, 2 precision-ground cutting edges, and 2 negatively ground spurs that produce clean, flat-bottomed holes in solid wood, sheet goods, and composite panel materials. Whether used on a multi-spindle boring machine with an adaptor or a drill press with a compatible chuck, the CMT 317.190.11 delivers the accuracy and surface quality that cabinet and furniture makers depend on.
Key Features
- HW (Tungsten Carbide) Head with Precision Balanced Centre Point - the carbide cutting head stays sharp longer through dense hardwoods and abrasive composite materials, reducing downtime for tool changes and maintaining consistent hole depth across long production runs.
- 2 Precision-Ground HW Cutting Edges (Z2) - dual carbide cutting edges distribute cutting load evenly, producing smooth flat-bottom hinge cup holes with minimal tearout - critical for clean European concealed hinge seating.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material perimeter before the cutters remove material, delivering clean bore walls and sharp entry circles in solid wood, MDF, chipboard, and plywood without chipping or fraying.
- Super-Strength Steel Body with Orange or Black PTFE Coating - the PTFE-coated cutter portion resists pitch and resin buildup, keeping the bit running freely and extending service life in high-volume cabinet production environments.
- Parallel Shank (10 x 26mm) with Driving Flat and Length Adjusting Screw - the driving flat locks the bit securely against rotation in the chuck or adaptor, while the length adjusting screw lets operators fine-tune boring depth precisely - essential for consistent hinge cup depth across multiple workpieces.
- Right-Hand (RH) Rotation - matched to standard right-hand boring machines and drill presses, ensuring the bit is immediately compatible with the most common workshop and production setups without requiring special toolholders.
Why This Product
- The flat-bottom boring geometry is specifically required for European concealed hinge cups - a general-purpose twist bit or brad-point bit cannot produce the geometry these hinges need, making a dedicated hinge boring bit like this the correct tool for the job.
- The 10 x 26mm parallel shank with driving flat and length adjusting screw makes this bit compatible with boring machines equipped with adaptors or chucks, giving it broad machine compatibility across both CNC boring centers and manual boring equipment.
- Tungsten carbide cutting edges and negatively ground spurs work together to produce clean entry circles and flat-bottomed holes in a range of cabinet materials - from solid hardwood to MDF and chipboard - reducing post-drilling cleanup and improving hinge seating quality.
- The PTFE coating on the cutter portion actively reduces friction and prevents resin buildup during repetitive boring cycles, helping maintain cutting performance and bit life in production cabinet shops where hinge holes are drilled in high volume.
Specifications
- Manufacturer Part Number: 317.190.11
- Brand: CMT Orange Tools
- Diameter: 3/4 in.
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: Right-Hand (RH)
- Number of Spurs: 2
- Number of Teeth: 2
- Tooth Geometry: Negatively ground spurs
- Head Material: HW (Tungsten Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes for European-style concealed hinge installation
- Cabinet door hinge boring
- Face frame hinge cup drilling
- Use on boring machines equipped with adaptors or chucks
Frequently Asked Questions
What machines is this hinge boring bit compatible with?
This bit is designed for boring machines equipped with adaptors or chucks. The 10 x 26mm parallel shank with a driving flat and length adjusting screw ensures a secure, precise fit in both production boring machines and bench-top drill presses fitted with a compatible chuck.
Why does a hinge boring bit need negatively ground spurs?
The 2 negatively ground spurs score the perimeter of the hole before the main carbide cutting edges remove material. This pre-scoring action prevents chip-out and fraying at the entry point, producing the clean, sharp-edged bore walls that European concealed hinges require for proper seating and a finished appearance.
What is the purpose of the PTFE coating on this bit?
The orange or black PTFE coating applied to the cutter portion of the bit resists pitch and glue buildup during boring. This reduces friction and keeps the bit cutting freely, which is especially valuable in high-volume cabinet production where the bit is used repeatedly across materials like chipboard and MDF that can transfer adhesives or resins.
Can the boring depth be adjusted with this bit?
Yes. The parallel shank includes a length adjusting screw that allows the operator to set and fine-tune the boring depth. This is particularly useful when boring hinge cups to a consistent depth across a large batch of cabinet doors, ensuring every European concealed hinge seats at exactly the right depth.
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