Product Description
The CMT Hinge Boring Bit 25 x 57.5mm RH is a precision-engineered boring tool from CMT, purpose-built for drilling flat-bottom hinge cup holes in cabinet doors, face frames, and panel components. Designed for right-hand rotation, this 25mm diameter bit delivers the clean, accurate bores required for European-style concealed hinge installation. Its tungsten carbide (HW) cutting head, negatively ground spurs, and PTFE-coated body make it a dependable choice for production woodworking environments and professional cabinet shops alike.
Key Features
- HW (Tungsten Carbide) Cutting Head - carbide construction resists wear and maintains cutting sharpness through high-volume hinge cup drilling in hardwood, MDF, chipboard, and plywood.
- 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges produce consistent, repeatable flat-bottom bores essential for proper European concealed hinge seating.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the wood fibers ahead of the cut, delivering clean bore walls and sharp, chip-free entry points with minimal tear-out.
- Precision-Balanced Centre Point - the HW centre point ensures accurate bit registration on the work surface, reducing drift and maintaining tight positional tolerances across multi-bore layouts.
- PTFE Coating on Cutter Portion - the orange or black PTFE coating on the cutter body reduces pitch and glue buildup, keeping the bit running freely and extending overall tool life between cleanings.
- Super-Strength Steel Body - the steel shank and body resist flexing and deflection under load, supporting accurate bore depth and consistent performance in repetitive production runs.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 26mm parallel shank with driving flat locks securely in boring machine adaptors or chucks, while the length adjusting screw allows precise depth setting without guesswork.
- Right-Hand Rotation - compatible with the standard spindle direction of most boring machines, CNC boring centers, and drill presses equipped with adaptors or chucks.
Why This Product
- The flat-bottom bore geometry is specifically required for European concealed hinges - this bit produces the exact hinge cup profile needed for proper hinge function and flush door alignment, eliminating the need for secondary cleanup passes.
- The combination of a precision-balanced HW centre point and negatively ground spurs means each bore starts accurately and finishes cleanly, reducing reject rates in cabinet door production where hinge placement is critical.
- 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 shops flexibility across different machine setups without requiring dedicated tooling for each.
- PTFE coating on the cutter portion actively resists pitch and adhesive buildup during boring in chipboard and MDF - two materials commonly used in cabinet construction - reducing downtime for cleaning and keeping cutting performance consistent throughout the workday.
Specifications
- Manufacturer Part Number: 317.250.11
- Brand: CMT Orange Tools
- Diameter: 25mm
- Total Length: 57.5mm
- Shank: 10 x 26mm
- Rotation: RH (Right-Hand)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Sharpening: Negatively ground spurs
- Material: HW (Tungsten Carbide)
- Product Type: Hinge Boring Bit
Approved Applications
- Drilling flat-bottom hinge cup holes in cabinet doors and face frames
- European concealed hinge installation
- Hinge boring in solid hardwood
- Hinge boring in softwood
- Hinge boring in chipboard
- Hinge boring in MDF
- Hinge boring in plywood
- Use in boring machines equipped with adaptors or chucks
Frequently Asked Questions
What size hinge cup does this bit produce?
This bit has a 25mm cutting diameter, which is the standard size for European-style concealed hinge cups. It produces a flat-bottom bore suited to the seating requirements of 35mm European concealed hinges commonly used in cabinet door construction.
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 driving flat is the standard interface for these machines. It can also be used in drill presses or handheld drills with an appropriate chuck.
What does the length adjusting screw do?
The length adjusting screw on the parallel shank allows the operator to fine-tune the bit's projection from the spindle or chuck, enabling precise bore depth control without relying solely on machine stop settings. This is particularly useful when setting consistent hinge cup depths across a production run.
Why are negatively ground spurs important for hinge boring?
Negatively ground spurs score the wood fiber at the perimeter of the bore before the main cutters remove material. This action produces a clean, sharp edge at the bore opening - important in finished panels and cabinet doors where a ragged entry hole would be visible or would compromise hinge cup fit.
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