Product Description
CMT 309.080.11 Dowel Drill 5/16" x 43 x 70mm RH by CMT is a precision-engineered, right-hand rotation dowel boring tool designed for clean, accurate blind holes in furniture panels, cabinet components, and solid wood assemblies. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 4-flute dowel drill delivers the smooth bore walls and flat-bottom results that dowel joinery and panel processing demand. The 70mm overall length makes it well suited for deeper panel stock where standard-length drills fall short, while the PTFE-coated cutter portion actively resists pitch and glue buildup during production runs.
Key Features
- HW (Tungsten Carbide) Cutting Head with Precision-Balanced Centre Point - the carbide-tipped tip stays on target from the first contact, preventing walk and producing accurately located holes in chipboard, MDF, hardwood, and laminates.
- 2 Precision-Ground Cutting Edges (Z2) - dual carbide cutting edges slice through wood fiber cleanly, reducing tear-out and delivering smooth bore walls ready for dowel insertion without secondary finishing.
- 2 Negatively Ground Spurs (V2) - the negatively ground spurs score the material perimeter before the main cutters engage, producing crisp, clean entry holes with minimal breakout on coated and laminated panels.
- 4 Spiral Flutes - four spiral flutes evacuate chips efficiently from the bore, reducing heat buildup and keeping the cutting zone clear for consistent hole quality across repetitive production cycles.
- Black or Orange PTFE Coating on Cutter Portion - the low-friction PTFE surface prevents resin, pitch, and adhesive from adhering to the tool, extending service life and reducing cleaning downtime.
- Parallel Shank 10 x 20mm with Driving Flat and Length Adjusting Screw - the standardized shank seats securely in multi-spindle boring machines and CNC boring centers, while the adjusting screw allows precise depth setting without guesswork.
- Right-Hand (RH) Rotation - matches the standard spindle direction of the vast majority of industrial boring machines, ensuring immediate compatibility without spindle reversal.
- 43mm Cutting Height in a 70mm Overall Length - the long-series format provides the cutting depth needed for thicker panel stock while the total length fits standard machine spindle clearances.
Why This Product
- The negatively ground spurs combined with the precision-balanced carbide centre point work together to produce chip-free entry and flat-bottom blind holes - exactly what dowel joint assembly requires for a flush, gap-free fit.
- The 43mm cutting height in a 70mm long-series body gives panel processors the reach to bore deeper blind holes in thicker stock without switching to a separate tool or extension adapter.
- The PTFE coating on the cutter portion directly addresses one of the most common productivity killers in high-volume boring operations - resin and glue adhesion - keeping the tool running longer between cleanings.
- The 10 x 20mm parallel shank with driving flat and length adjusting screw provides a positive, repeatable setup in industrial boring machine spindles, reducing setup variation and maintaining consistent hole depth across large panel runs.
Specifications
- Manufacturer Part Number: 309.080.11
- Brand: CMT Orange Tools
- Diameter: 5/16"
- Cutting Height: 43mm
- Total Length: 70mm
- Shank: 10 x 20mm (parallel shank with driving flat and length adjusting screw)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Number of Flutes: 4
- Blade Material: HW (Tungsten Carbide)
- Rotation: Right-Hand (RH)
- Coating: Black or orange PTFE on cutter portion
- Body Material: Super-strength steel
Approved Applications
- Drilling blind holes for dowel connections in panel assemblies
- Furniture manufacturing - cabinet carcass and door frame boring
- Cabinet making - shelf pin and hinge-plate dowel boring
- Panel processing on chipboard, MDF, HDF, and coated panels
- Boring in solid hardwood and softwood components
- Plywood and laminate panel drilling
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center production runs
Frequently Asked Questions
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs score the outer perimeter of the hole before the main carbide cutting edges remove material. This pre-scoring action severs wood fibers and surface laminates cleanly at the entry point, preventing chipout and tear-out on coated panels, laminates, and veneered boards - leaving a clean, crisp hole edge that requires no additional cleanup before dowel insertion.
What shank size and type does this drill use, and which machines accept it?
This drill uses a 10 x 20mm parallel shank with a driving flat and a length adjusting screw. This shank format is the standard used in industrial multi-spindle CNC boring machines, CNC boring centers, and panel processing centers. The driving flat prevents rotation in the spindle under load, and the adjusting screw allows the operator to set drilling depth precisely and repeatably.
What does the PTFE coating on the cutter portion do, and how does it help in production?
The black or orange PTFE coating applied to the cutter portion of the drill creates a low-friction, non-stick surface. In high-volume boring operations, wood resins, pitch, and adhesives from pre-glued or coated panels tend to accumulate on cutting tools, degrading performance and requiring frequent cleaning stops. The PTFE coating resists this buildup, keeping the cutting edges and flutes clear for longer and reducing downtime between maintenance intervals.
Why choose the 70mm long-series length rather than a shorter dowel drill?
The 70mm overall length with a 43mm cutting height is intended for panel thicknesses and boring depths that exceed what standard-length dowel drills can reach. When drilling deep blind holes in thicker panel stock - common in solid wood furniture components or heavier chipboard panels - the additional length provides the reach needed without the use of extension adapters, maintaining a more rigid and accurate setup in the boring machine spindle.
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