CMT 4 Flute Dowel Drill for Through Holes - 9/32" x 2-3/4" LH is a left-hand rotation, through-hole dowel drill engineered for precise, clean boring in panel processing and cabinet assembly applications. Built with a tungsten carbide (HW) cutting edge and a 40mm cutting height, this drill moves cleanly through chipboard, MDF, hardwood, softwood, plywood, and coated panels. The left-hand (LH) rotation makes it the correct tool for multi-spindle CNC boring machines and boring centers that run a mix of right-hand and left-hand spindles simultaneously, ensuring paired drilling operations stay perfectly synchronized.

Key Features

• Hardmetal (HW) Carbide Construction - the tungsten carbide cutting material resists heat and wear far longer than standard high-speed steel, reducing downtime for tool changes during production runs on chipboard, MDF, and hardwood panels.
• 7mm Diameter with 40mm Cutting Height - delivers a full 40mm of usable cutting length in a 7mm bore, allowing the drill to pass cleanly through a wide range of panel thicknesses in a single pass without stepping or repositioning.
• 70mm Total Length with 10x20mm Shank - the long-series 70mm overall length combined with a sturdy 10x20mm shank provides the reach and rigidity needed for deep through-hole boring while maintaining concentricity in multi-spindle heads and CNC chucks.
• Left-Hand (LH) Rotation - specifically designed for left-hand spindles on multi-spindle CNC boring machines and panel processing centers, ensuring correct chip evacuation direction and clean entry and exit holes when paired with right-hand drills on the same head.
• Through-Hole 60 deg. Tooth Geometry - the 60 deg. point angle is optimized for through-hole boring, promoting balanced cutting forces and a smooth, consistent bore wall from entry to exit with minimal breakout on the face of the panel.
• 2-Tooth Cutting Configuration - a two-tooth geometry keeps cutting forces controlled and balanced at operating speeds, producing flat-bottomed through holes with clean walls suitable for dowel joinery and hardware insertion.

Why This Product

• The left-hand rotation is a non-negotiable requirement for left-hand spindle positions on multi-spindle boring heads - using the wrong rotation direction causes chip packing, burning, and hole irregularity, so this drill solves that problem at the spindle level.
• The 40mm cutting height in a 70mm long-series body means the drill handles typical panel thicknesses used in cabinet and furniture manufacturing in a single plunge, avoiding the repositioning and misalignment risk that comes with shorter drills.
• Hardmetal (HW) carbide tooling holds its edge through abrasive materials like MDF, HDF, chipboard, and laminates - materials that quickly dull standard steel drills - keeping bore quality consistent across longer production cycles.
• With a 10x20mm shank sized for standard boring machine chucks and CNC boring center collets, this drill fits directly into the most common panel processing equipment without adapters or custom toolholders.

Specifications

• Manufacturer Part Number: 375.070.12
• Brand: CMT Orange Tools
• Diameter: 7mm
• Cutting Height: 40mm
• Total Length: 70mm
• Shank: 10x20mm
• Number of Teeth: 2
• Rotation: LH (Left-Hand)
• Tooth Geometry: Through holes 60
• Blade Material: HW (Hardmetal Carbide)

Approved Applications

• Multi-Spindle CNC Boring Machine
• CNC Boring Center
• Panel Processing Center
• Boring Machine with Adapter or Chuck
• Chipboard
• MDF
• HDF
• Hardwood
• Softwood
• Plywood
• Laminates
• Coated Panels