Product Description
The CMT Hinge Boring Bit 30 x 57.5mm RH is a precision-engineered tungsten carbide (HW) boring tool designed for drilling flat-bottom hinge cup holes in cabinet doors, face frames, and panel components. Built for use on boring machines equipped with adaptors or chucks, this right-hand rotation bit delivers the clean, accurate results required for European-style concealed hinge installation. The 30mm diameter matches the most common cup-hole size for 35mm European hinge systems, making it a go-to choice for cabinet shop production and custom woodworking alike.
Key Features
- Tungsten Carbide (HW) Cutting Head with Precision Balanced Centre Point - the carbide construction maintains a sharp, consistent cutting edge through high-volume production runs, and the balanced centre point keeps the bit tracking accurately for repeatable, on-center holes every time.
- 2 HW Precision Ground Cutting Edges (Z2) - dual carbide cutting edges share the workload evenly, reducing heat buildup and extending tool life across chipboard, MDF, plywood, hardwood, and softwood.
- 2 Negatively Ground Spurs (V2) - the negatively ground spurs score the material ahead of the cutters, producing clean bore walls and crisp, tear-out-free entry edges - critical for a professional finish on finished cabinet faces.
- Super-Strength Steel Body with P.T.F.E. Coating - the cutter portion is coated with orange or black P.T.F.E., which prevents pitch and glue buildup and reduces friction so the bit clears waste cleanly and runs cooler during extended use.
- Parallel Shank (10 x 26mm) with Driving Flat and Length Adjusting Screw - the standardized parallel shank fits adaptors and chucks on multi-spindle boring machines and CNC boring centers, while the driving flat prevents slippage and the length adjusting screw allows precise depth setting without guesswork.
- Right-Hand (RH) Rotation - compatible with the standard spindle direction on the vast majority of cabinet boring machines, ensuring straightforward drop-in installation with no special setup required.
Why This Product
- The 30mm cutting diameter is the correct size for flat-bottom hinge cup holes used with European concealed hinges, meaning no modification or custom setup is needed - the bit is ready to work for its intended application straight out of the box.
- The combination of a precision balanced carbide centre point, dual carbide cutting edges, and negatively ground spurs produces flat-bottom holes with clean walls and crisp rims - the quality a hinge cup seat demands for a flush, rattle-free hinge fit.
- The P.T.F.E. coating actively resists pitch and adhesive buildup during production use, reducing the frequency of cleaning stops and keeping the bit performing consistently over long boring sessions.
- The 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 common cabinet shop equipment.
Specifications
- Manufacturer Part Number: 317.300.11
- Brand: CMT Orange Tools
- Diameter: 30mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: Right-hand (RH)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Spur 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 hinge installation
- Cabinet door hinge cup boring
- Face frame hinge seat drilling
- Panel processing for concealed hinge mounting
- Use on boring machines equipped with adaptors or chucks
Frequently Asked Questions
What shank size does this bit use, and will it fit my boring machine?
This bit uses a 10 x 26mm parallel shank with a driving flat and a length adjusting screw. It is designed for boring machines equipped with adaptors or chucks that accept this shank size. The driving flat prevents rotation in the chuck, and the adjusting screw allows for precise depth calibration.
Why are negatively ground spurs important for hinge cup boring?
Negatively ground spurs score the perimeter of the hole ahead of the main cutting edges. This severs the wood fibers cleanly before material is removed, which minimizes tear-out at the rim of the bore and produces the clean, smooth walls needed for a properly seated European concealed hinge cup.
What materials can this hinge boring bit cut?
The HW (tungsten carbide) cutting head is suited for boring into solid hardwood, softwood, chipboard, MDF, and plywood - the panel materials most commonly used in cabinet door and face frame construction.
What does the P.T.F.E. coating on this bit do?
The orange or black P.T.F.E. coating applied to the cutter portion of the bit resists pitch and glue buildup on the tool surface. This reduces friction during cutting, helps the bit evacuate chips more freely, and extends the working life of the tool by keeping the cutting geometry clear during production use.
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