Product Description
CMT 309.150.11 Dowel Drill - 15 x 43 x 70mm Right-Hand by CMT is a precision-engineered 4-flute dowel boring bit built for demanding panel processing and furniture production applications. Designed for drilling clean, flat-bottom blind holes used in dowel joinery, this carbide-tipped (HW) drill features a 15mm cutting diameter, a 43mm cutting height, and a 70mm overall length that accommodates thicker panel stock requiring deeper blind bores. Whether you are working with chipboard, MDF, solid hardwood, or coated laminates, this right-hand rotation dowel bit delivers repeatable accuracy on multi-spindle boring machines and CNC boring centers alike.
Key Features
- HW (Tungsten Carbide) Cutting Head - a precision-ground carbide tip maintains a sharp, stable cutting edge through high-volume production runs, reducing retooling downtime and extending service intervals compared to standard steel bits.
- 2 Precision-Ground HW Cutting Edges (Z2) - dual carbide cutting edges deliver consistent chip removal and produce flat-bottom holes with tight dimensional tolerances, critical for accurate dowel alignment in furniture assembly.
- 2 Negatively Ground Spurs (V2) - negatively sharpened spurs score the material cleanly before the main cutters engage, eliminating tearout and leaving smooth bore walls on chipboard, MDF, laminates, and coated panels.
- 4 Spiral Flutes - four flutes evacuate chips efficiently from the bore during drilling, preventing heat buildup and reducing the risk of surface burning or clogging in dense engineered wood materials.
- PTFE-Coated Cutter Portion - a black or orange PTFE coating on the spiral resists pitch and glue adhesion, keeping the tool cleaner during production and extending effective tool life without frequent manual cleaning.
- Super-Strength Steel Body - the steel shank and body resist flex and vibration under load, supporting accurate, repeatable bore positioning across multi-spindle setups and high-cycle operations.
- Precision-Balanced Centre Point - the HW centre point self-locates on the workpiece surface, preventing bit walk at the start of the bore and ensuring each hole is drilled exactly on position.
- Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 20mm parallel shank with driving flat locks securely into machine chucks and boring heads, while the length-adjusting screw allows precise depth setting to match your drilling block configuration.
- Right-Hand Rotation - RH rotation is compatible with standard multi-spindle boring machines, CNC boring centers, and panel processing equipment running conventional spindle directions.
Why This Product
- The 70mm overall length qualifies this as a long-series dowel drill, making it the right choice when panel thickness or machine geometry requires additional clearance depth that standard-length bits cannot reach.
- The combination of negatively ground spurs and precision carbide cutting edges means panels with sensitive surface finishes - including laminates and coated boards - exit the bore cleanly without chipping, reducing reject rates in furniture and cabinet production.
- The PTFE-coated spiral reduces pitch and adhesive buildup during repeated drilling cycles, so operators spend less time cleaning bits and more time running production, directly lowering per-unit processing costs.
- A 10 x 20mm parallel shank with driving flat and length-adjusting screw provides a secure, repeatable mount in machine boring heads, making this bit straightforward to set up and re-set when changing panel thicknesses or switching between jobs.
Specifications
- Manufacturer Part Number: 309.150.11
- Brand: CMT Orange Tools
- Diameter: 15mm
- Cutting Height: 43mm
- Total Length: 70mm
- Shank: 10 x 20mm (parallel shank with driving flat and length-adjusting screw)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Number of Flutes: 4
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Rotation: Right-Hand (RH)
- Coating: Black or orange PTFE on cutter portion
Approved Applications
- Drilling blind holes for dowel connections in panel furniture and cabinet assembly
- Panel drilling on multi-spindle CNC boring machines and CNC boring centers
- Panel processing on boring machines equipped with a compatible adapter or chuck
- Furniture manufacturing requiring precise, repeatable dowel hole placement
- Cabinet making in solid wood, chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
Frequently Asked Questions
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs score the surface fibers of the workpiece before the main carbide cutting edges begin removing material. This pre-scoring action severs the grain cleanly, preventing tearout and producing smooth bore walls - particularly important when drilling chipboard, MDF, laminates, or coated panel surfaces where edge quality directly affects the finished joint.
Why does this dowel drill have 4 flutes if it only has 2 cutting edges?
The 4 spiral flutes serve a chip evacuation function independent of the cutting edges. As the 2 carbide edges (Z2) cut material at the base of the bore, the 4 flutes carry chips up and out of the hole efficiently. This reduces heat buildup inside the bore and lowers the risk of chip packing, which can cause burning or surface damage in dense engineered wood materials.
What does the PTFE coating on the cutter portion do during production drilling?
The black or orange PTFE coating applied to the spiral resists the adhesion of pitch and glue residue that accumulates during repeated drilling cycles in wood-based panels. By preventing this buildup, the coating helps maintain cutting performance over longer production runs and reduces how often the bit needs to be removed and cleaned manually.
What shank configuration does this bit use, and how is drilling depth controlled?
This dowel drill uses a 10 x 20mm parallel shank with a driving flat that locks securely in the machine chuck or boring head. A length-adjusting screw is also incorporated into the shank design, allowing the operator to set and fine-tune the drilling depth to match the panel thickness and the required blind hole depth for the dowel joint being produced.
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