CMT 314.080.12 Dowel Drill for Through Holes - 5/16" x 35 x 70mm Left-Hand Rotation is a professional-grade, 2-flute carbide-tipped boring tool engineered for clean, precise through-hole drilling in panel processing and furniture manufacturing applications. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotation dowel drill is designed to produce accurate, blowout-free through holes for dowel joinery in solid wood, chipboard, MDF, and coated panels. The 70mm overall length and 35mm cutting height make it well suited for panels where a full pass-through bore is required, while the parallel shank with driving flat and length adjusting screw ensures reliable, repeatable positioning in multi-spindle CNC boring machines and panel processing centers.

Key Features

• Tungsten Carbide (HW) Cutting Head - hard-wearing carbide material maintains a sharp edge through high-volume panel drilling, reducing downtime for tool changes and regrinding cycles.
• PTFE-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion prevents pitch, resin, and adhesive buildup, keeping the tool running cleanly and extending service life between cleanings.
• Precision-Balanced Centre Point - the HW head features a precision-balanced centre point that registers accurately at the start of the bore, reducing wander and producing consistently located holes for tight-tolerance dowel assembly.
• 2 Precision-Ground Cutting Edges (Z2) - dual precision-ground flutes generate a smooth bore wall on entry and a clean exit, minimizing tearout and surface damage on finished or laminated panel faces.
• Left-Hand Rotation (LH) - the LH rotation direction is engineered for through-hole boring applications where the cutting geometry pulls material away from the exit face, reducing blowout on the underside of the panel.
• Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x26mm parallel shank seats securely in multi-spindle boring heads and CNC chucks, while the driving flat prevents slippage and the length adjusting screw allows precise depth and projection setting without additional fixtures.
• 5/16" Diameter x 35mm Cutting Height x 70mm Total Length - the long-series 70mm body provides sufficient projection for full through-hole passes in panels up to approximately 30mm thick, making it a direct fit for standard furniture panel thicknesses.

Why This Product

• The 70mm total length and 35mm cutting height are specifically sized for through-hole boring in standard furniture panels, eliminating the need to modify drill projection or substitute longer tooling for panels in common thickness ranges.
• Left-hand rotation combined with the precision-ground Z2 cutting edges means the drill exits the panel cleanly - a critical requirement in furniture and cabinet production where both faces of a panel may be visible or pre-laminated.
• The PTFE-coated spiral and HW carbide head together address two of the most common through-hole boring problems - pitch buildup slowing the cut and rapid edge wear from abrasive engineered wood products - in a single tool design.
• The parallel shank with driving flat and length adjusting screw is directly compatible with multi-spindle CNC boring machines and panel processing centers, making this drill a drop-in fit for production shop setups without requiring adapters or custom toolholders.

Specifications

• Manufacturer Part Number: 314.080.12
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 35mm
• Total Length: 70mm
• Shank: 10x26mm
• Number of Cutting Edges: 2
• Rotation: Left-Hand (LH)
• Blade Material: HW (Tungsten Carbide)
• Sharpening Type: Through holes 60

Approved Applications

• Through-hole dowel connection drilling
• Furniture manufacturing and panel processing
• Solid wood boring
• Chipboard and particleboard drilling
• MDF and HDF through-hole boring
• Laminated and coated panel processing
• Multi-spindle CNC boring machine operations
• CNC boring center and panel processing center applications