CMT 346.080.12 Dowel Drill with Threaded Shank - 5/16" Diameter, M10 Shank, Left-Hand Rotation is a precision boring tool engineered for cabinetmakers, furniture manufacturers, and panel processors who demand clean, accurate dowel holes in high-volume production environments. Designed by CMT to mount directly onto multi-spindle boring machines via its M10x1.5 threaded shank, this left-hand dowel drill eliminates the need for adapters and delivers consistent, flat-bottom holes in solid wood, chipboard, MDF, and a wide range of engineered panel materials. Whether you are running a CNC boring center or a traditional panel processing line, this carbide-tipped drill brings professional-grade precision to every bore.

Key Features

• Hardmetal (Carbide) Cutting Material - tungsten carbide construction maintains a sharp cutting edge through demanding production runs in hardwood, softwood, chipboard, and coated panels, reducing downtime from dulling or chipping.
• M10x1.5 Threaded Shank - threads directly into multi-spindle boring machine spindles without an adapter, providing a rigid, zero-wobble connection that improves hole accuracy and simplifies tool changes.
• Left-Hand (LH) Rotation - engineered specifically for left-hand spindle positions on multi-spindle boring heads, ensuring the correct cutting geometry is always engaged and preventing tool loosening during operation.
• 2 Spurs with 2 Cutting Teeth - precision-ground spurs score the surface ahead of the main cutters, producing clean bore walls and flat-bottom holes with minimal tearout on laminates, coated panels, and veneered surfaces.
• 43mm Cutting Height - provides generous usable cutting depth relative to the 63mm overall length, giving operators flexibility across a range of workpiece thicknesses without tool changes.
• 5/16" Bore Diameter - a widely used standard dowel size for furniture and cabinet assembly, making this drill directly compatible with common dowel joinery systems and shelf-pin layouts.

Why This Product

• Direct spindle mounting saves setup time - the M10 threaded shank mounts directly to compatible boring machine spindles, eliminating adapter hardware and reducing the number of components that can introduce runout or misalignment on a production line.
• Purpose-built for left-hand spindle positions - left-hand rotation is not a universal specification; choosing this drill for LH spindle slots ensures proper cutting geometry and prevents the shank from backing out under load, a critical safety and accuracy consideration.
• Hardmetal construction extends tool life in engineered panels - chipboard, MDF, and coated panels are abrasive materials that wear standard steel quickly; the HW carbide material handles these substrates far better, keeping edges sharp across longer production intervals.
• 2-spur design suits laminated and coated panel work - for shops processing coated or veneered panels where surface quality is critical, the precision spurs pre-score the surface layer before the main flutes evacuate material, dramatically reducing surface chip-out that would require rework.

Specifications

• Manufacturer Part Number: 346.080.12
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 43mm
• Relative Length: 63mm
• Shank: M10mm (M10x1.5 threaded)
• Rotation: Left-Hand (LH)
• Number of Spurs: 2
• Number of Teeth: 2
• Blade Material: Hardmetal (HW - Carbide)
• Series: Threaded Shank Dowel Drills

Approved Applications

• Multi-spindle CNC boring machines (left-hand spindle positions)
• CNC boring centers with M10 threaded spindles
• Panel processing centers
• Dowel hole boring in solid hardwood and softwood
• Dowel drilling in chipboard and particleboard
• Boring in MDF and HDF panels
• Drilling in plywood and laminated panels
• Coated and surface-finished panel processing