Product Description
CMT 314.090.12 Dowel Drill for Through Holes - 9 x 35 x 70mm Left-Hand Rotation is a precision carbide-tipped boring tool engineered for clean, accurate through-hole drilling in panel processing and furniture manufacturing. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 9mm diameter drill delivers consistent, blowout-free bores through chipboard, MDF, hardwood, plywood, and coated panels. The left-hand (LH) rotation design makes it the correct choice for multi-spindle boring machines and CNC boring centers that require LH tooling on specific spindle positions.
Key Features
- HW (Tungsten Carbide) Cutting Head with Precision Balanced Centre Point - the carbide tip maintains a sharp, stable entry point that keeps the drill on-center, producing accurately located through holes with minimal wandering even in dense engineered panels.
- 2 Precision Ground Cutting Edges (Z2) - dual cutting edges shear material symmetrically on each revolution, reducing cutting forces and delivering smooth bore walls suitable for tight-tolerance dowel connections.
- PTFE-Coated Spiral Portion (Orange or Black) - the non-stick polytetrafluoroethylene coating on the flutes prevents pitch, resin, and glue buildup, keeping the bit running freely and extending service life between sharpenings.
- 2 Spiral Flutes - aggressive chip evacuation channels pull waste material out of the bore continuously, preventing chip packing that can cause burning, tearout, or bit deflection.
- Super-Strength Steel Body - the steel shank and body absorb vibration and resist flex under load, maintaining bore geometry over high-volume production runs.
- Parallel Shank with Driving Flat and Length Adjusting Screw (10 x 26mm) - the driving flat locks the drill securely against rotation in the spindle collet, while the adjusting screw allows precise depth setting without removing the tool, speeding up changeovers on multi-bore machines.
- Left-Hand (LH) Rotation - purpose-built for left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring correct cutting geometry and clean hole entry on every pass.
- Through-Hole Geometry (35mm Cutting Height, 70mm Overall Length) - the long-series 70mm body reaches fully through panels up to approximately 35mm thick, and the through-hole point geometry minimizes exit-side blowout for a clean bore on both faces.
- Sharpenable Construction (Through Holes 60) - designed to be resharpened, reducing total cost of ownership compared to disposable tooling in high-cycle production environments.
Why This Product
- The 9mm diameter and 35mm cutting height match the most common dowel pin sizing used in flat-pack and cabinet-grade furniture production - making this drill a direct fit for standard dowel joinery workflows without requiring custom tooling.
- The combination of a carbide cutting head and PTFE-coated flutes means the drill handles abrasive materials like MDF, HDF, and melamine-coated panels that quickly dull uncoated or HSS tooling - sustaining edge life through demanding production cycles.
- The left-hand rotation designation is not interchangeable - using an LH drill in the correct spindle position ensures the cutting edges engage the material properly, preventing rubbing, heat buildup, and premature edge failure that occurs when rotation direction is mismatched.
- The parallel shank with driving flat and length adjusting screw is compatible with standard boring machine chuck systems, making this drill a drop-in replacement for worn tooling on multi-spindle boring heads and CNC panel processing centers without machine modification.
Specifications
- Manufacturer Part Number: 314.090.12
- Brand: CMT Orange Tools
- Description: Dowel Drill for Through Hole 9 x 35 x 70mm LH
- Diameter: 9mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Number of Cutting Edges: 2
- Rotation: LH (Left-Hand)
- Blade Material: HW (Tungsten Carbide)
- Sharpening: Through holes 60
Approved Applications
- Drilling through holes for dowel pin connections in furniture and cabinet assembly
- Panel processing on multi-spindle CNC boring machines
- Through-hole boring on CNC boring centers and panel processing centers
- Boring machine operations using an adapter or chuck
- Through-hole drilling in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill is designed to bore completely through the workpiece from one face to the other, with a point geometry that minimizes tearout and blowout at the exit face. A blind-hole drill is optimized to stop at a precise depth inside the panel. The CMT 314.090.12 is specifically a through-hole design with a 35mm cutting height and 70mm overall length, suited for panels where the hole must pass entirely through the material.
Why does rotation direction matter, and how do I know if I need a left-hand drill?
On multi-spindle boring machines, individual spindle positions are geared to rotate in specific directions - some left-hand, some right-hand. Using a drill with the wrong rotation direction causes the cutting edges to rub rather than cut, resulting in poor hole quality, rapid edge wear, and potential workpiece damage. The CMT 314.090.12 is designated LH (left-hand) rotation and must be used only in left-hand spindle positions. Check your machine's spindle rotation map before installing this drill.
What does the PTFE coating on the spiral flutes do?
The orange or black PTFE (polytetrafluoroethylene) coating applied to the spiral portion of the drill creates a low-friction, non-stick surface on the flutes. This prevents pitch, resin, adhesive, and fine dust from bonding to the tool body during cutting. Keeping the flutes clear maintains efficient chip evacuation, reduces heat buildup in the bore, and extends the usable life of the cutting edges - especially important when drilling MDF, coated panels, and other resin-rich engineered wood products.
Can this drill be resharpened, and what sharpening method does it require?
Yes. The CMT 314.090.12 is designed to be resharpened, which is one advantage of the HW (tungsten carbide) construction over disposable tooling. The sharpening specification for this drill is "Through holes 60," which refers to the sharpening method and geometry applicable to through-hole dowel drills of this type. Resharpening should be performed by a qualified tool grinding service familiar with carbide boring bits to maintain proper cutting geometry.
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