CMT 309.127.12 Dowel Drill - 1/2" x 43 x 70mm Left-Hand Rotation by CMT is a precision-engineered boring tool built for high-volume furniture manufacturing, cabinet making, and panel processing where clean, accurate blind holes are essential. Designed as a long-series dowel drill at 70mm overall length, this left-hand rotating bit accommodates thicker panel stock and deeper blind-hole requirements. Its 4-flute spiral design, hardmetal (HW) cutting head, and PTFE-coated cutter body make it a reliable choice for production drilling in chipboard, MDF, solid wood, laminates, and coated panels.

Key Features

• Super-strength steel body with HW (hardmetal) cutting head - the carbide tip bonded to a high-strength steel shank delivers long-lasting edge retention even in abrasive engineered panels like MDF and chipboard, reducing tool change frequency on the production line.
• PTFE coating on the cutter portion (black or orange) - resists pitch and adhesive buildup on the flutes, so the bit stays cleaner longer and maintains consistent chip evacuation throughout extended production runs.
• 2 precision-ground HW cutting edges (Z2) - hardmetal cutting edges that are precision-ground provide a flat-bottomed hole with tight dimensional accuracy, which is critical for dowel joint alignment in furniture and cabinet assembly.
• 2 negatively ground spurs (V2) - the negative grind on the spurs scores the panel surface cleanly ahead of the cutting edges, preventing tearout on laminates and coated panels where surface finish matters.
• 4 spiral flutes - four flutes provide efficient chip clearance and balanced cutting forces, reducing heat buildup and improving hole quality at production boring speeds.
• Parallel shank (10x20mm) with driving flat and length-adjusting screw - the driving flat prevents shank slippage under torque, and the length-adjusting screw allows precise depth setting in multi-spindle boring machines, CNC boring centers, and panel processing equipment.
• Left-hand (LH) rotation - designed specifically for left-hand spindles on multi-spindle boring machines, this bit correctly pairs with LH-designated spindle positions without requiring adapters or workarounds.
• Long-series 70mm total length with 43mm cutting height - the extended length reaches the depth needed for thicker panel stock and cabinetry components where standard-length drills fall short.

Why This Product

• The left-hand rotation is not a universal spec - it is the correct match for LH spindle positions on multi-spindle CNC boring machines and panel processing centers, ensuring proper cutting geometry and clean hole walls on every pass.
• The 43mm cutting height combined with the 70mm overall length makes this a long-series solution for cabinetry and furniture panels that require deeper blind holes than standard-length dowel drills can reach.
• The negatively ground spurs combined with the precision HW cutting edges work together to produce clean entry and flat-bottomed holes in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels - covering the full range of materials common in panel furniture production.
• The PTFE-coated cutter body and 4-flute spiral design reduce cleaning downtime and maintain consistent boring performance across long production runs, making this bit well suited for high-throughput manufacturing environments.

Specifications

• Manufacturer Part Number: 309.127.12
• Brand: CMT Orange Tools
• Diameter: 1/2"
• Cutting Height: 43mm
• Total Length: 70mm
• Shank: 10x20mm parallel shank with driving flat
• Number of Cutting Edges: 2
• Number of Spurs: 2
• Spurs Sharpening: Negatively ground spurs
• Number of Flutes: 4
• Rotation: LH (Left-Hand)
• Blade Material: HW (Hardmetal / Tungsten Carbide)

Approved Applications

• Drilling blind holes for dowel connections
• Panel drilling in furniture manufacturing
• Cabinet making and case construction
• Multi-spindle CNC boring machine operations
• CNC boring center and panel processing center use
• Boring machines with adapter or chuck