Product Description
CMT 537.550.31 Forstner Bit - 55mm is a precision boring tool built from super strength SP steel, designed to drill clean, flat-bottom holes in softwood with exceptional accuracy. Whether you are installing cabinet hinges, mounting shelf pins, or creating arched and oval openings at any angle, this 55mm bit delivers repeatable results with minimal tearout. The 10x30mm shank and right-hand rotation make it compatible with standard drill presses and handheld drills, while the 2-spur, 2-tooth configuration ensures smooth entry and a crisp bore wall on every cut.
Key Features
- Super Strength (SP) Steel Construction - delivers long lasting cutting performance, meaning fewer replacements and consistent results across extended use in softwood drilling applications.
- 2 Precision-Ground Spurs - score the wood fiber ahead of the main cutting edges, producing clean, chip-free bore walls without splintering the surrounding surface.
- 2 Cutting Teeth - work in tandem with the spurs to remove material efficiently, reducing load on the drill and keeping cuts smooth and controlled.
- Precision Centre Point - keeps the bit accurately positioned at the start of each plunge, preventing walk and ensuring repeatable flat-bottom hole placement for hinge and hardware installation.
- 55mm Cutting Diameter - sized specifically for larger hardware installations, bracket niches, frame openings, and curved cutouts that smaller bits cannot accommodate.
- 10x30mm Shank - provides a secure grip in drill press and handheld drill chucks, reducing vibration and maintaining concentricity during deep cuts.
- Right-Hand (RH) Rotation - compatible with all standard drill machines without requiring reverse-rotation tooling or special setup.
- Flat-Bottom Hole Geometry - creates precise recesses for installing brackets, straps, frames, and grids where through-holes are not appropriate.
Why This Product
- Accurate flat-bottom holes every time - the precision centre point and matched spur-and-tooth geometry prevent wandering at plunge entry, making this bit the right choice when hinge alignment or hardware positioning cannot be off by even a millimeter.
- Handles angled and partial cuts that standard twist bits cannot - the Forstner bit design allows drilling overlapping holes, oval openings, and arched cutouts at any angle in the workpiece, expanding the range of joinery and installation tasks possible with a single tool.
- Built for repeated use in production and shop environments - SP steel is selected for long lasting cutting performance, making this bit a practical investment for cabinet shops, furniture makers, and contractors who drill large-diameter holes frequently.
- Creates clean recesses for concealed hardware - the flat-bottom geometry is specifically suited for installing brackets, straps, frames, and grids where a clean, level recess is required rather than a through-hole or tapered pocket.
Specifications
- Manufacturer Part Number: 537.550.31
- Brand: CMT Orange Tools
- Diameter: 55mm
- Total Length: 3-35/64"
- Shank: 10x30mm
- Number of Spurs: 2
- Number of Teeth: 2
- Blade Material: Super Strength (SP) Steel
- Rotation: Right-Hand (RH)
Approved Applications
- Drilling precise flat-bottom holes in softwood
- Hinge installation and cabinet hardware mounting
- Shelf pin and bracket recess drilling
- Creating oval and arched openings at any angle
- Installing brackets, straps, frames, and grids in niches
- Overlapping hole patterns for shaped cutouts
Frequently Asked Questions
What shank size does this Forstner bit use, and will it fit my drill press?
This bit uses a 10x30mm shank. It is compatible with standard drill press chucks and handheld drills that accept a 10mm round shank. Check your chuck capacity before use to confirm a secure fit.
Can this bit drill holes at an angle or create partial overlapping holes?
Yes. Forstner bits are specifically designed to drill at any angle in a workpiece and can produce overlapping holes, oval openings, and arched cutouts - tasks that are not possible with standard twist or spade bits. This makes the 537.550.31 well suited for decorative and joinery applications beyond simple round through-holes.
What materials is this 55mm Forstner bit designed to cut?
According to CMT product data, this bit is designed for drilling in natural softwood. It is not specified or rated for use in composites, metal, or masonry.
What is the flat-bottom hole geometry used for in cabinet and furniture work?
The flat-bottom hole produced by a Forstner bit creates a level recess rather than a tapered or through-hole pocket. This geometry is required when installing hinges, shelf pins, brackets, straps, and frames or grids where the hardware must seat flush and stable inside the workpiece without breaking through to the opposite face.
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