CMT 378.102.12 Dowel Drill with Countersink for Through Holes is a precision-engineered, left-hand rotation boring bit designed for CNC and multi-spindle boring machines used in panel processing and furniture production. With a 10mm cutting diameter and tungsten carbide (HW) construction, this through-hole dowel drill performs drilling, countersinking, and full through-penetration in a single pass - saving setup time and delivering consistent, clean results across a wide range of engineered wood and solid wood materials.

Key Features

• Tungsten Carbide (HW) Cutting Material - hard-metal carbide maintains a sharp, durable cutting edge through high-volume production runs, reducing the need for frequent bit changes and downtime.
• Through-Hole with Countersink Geometry - drills, countersinks, and penetrates completely in one pass, eliminating secondary operations and improving throughput on panel processing lines.
• Left-Hand (LH) Rotation - engineered specifically for LH spindle positions on multi-spindle CNC boring centers, ensuring correct chip evacuation and bore quality without tool reversal.
• 2 Spurs and 2-Flute Design - dual spurs score the material perimeter before the main cutting edges engage, producing clean bore walls with minimal tearout on chipboard, MDF, laminates, and coated panels.
• 60 deg. Through-Hole Sharpening Geometry - the precision-ground tip angle is optimized for through-penetration, supporting flat, clean entry and exit surfaces on both faces of the workpiece.
• 10mm Diameter x 35mm Cutting Height - sized to match standard dowel joint requirements used in cabinet and furniture manufacturing, producing accurately dimensioned holes for tight-fitting dowel assemblies.
• 25/64" Shank (10x20mm) - compatible with standard boring machine chucks and adapters, allowing straightforward integration into existing CNC boring center setups.
• 70mm Total Length - provides sufficient reach for deep panel applications while maintaining rigidity and minimizing deflection during high-speed boring operations.

Why This Product

• The combined through-hole and countersink geometry means this bit handles the complete bore cycle in a single spindle pass - reducing cycle time and improving consistency across batch panel production.
• Left-hand rotation design makes this bit a direct fit for LH spindle positions on multi-spindle CNC boring centers and panel processing equipment, eliminating the need for adapter workarounds.
• Tungsten carbide (HW) construction delivers the hardness needed to maintain cutting performance on abrasive materials like chipboard, MDF, HDF, and laminated panels over extended production runs.
• The 10mm diameter and 26.5mm secondary cutting height (I1) align with industry-standard dowel joint sizing, making this bit a practical choice for furniture, cabinet, and case goods manufacturing operations.

Specifications

• Manufacturer Part Number: 378.102.12
• Brand: CMT Orange Tools
• Diameter: 10mm
• Cutting Height: 35mm
• Cutting Height (I1): 26.5mm
• Total Length: 70mm
• Shank: 10x20mm (25/64"x25)
• Rotation: Left-Hand (LH)
• Number of Spurs: 2
• Number of Teeth: 2
• Tooth Geometry: Through holes 60
• Blade Material: HW (Tungsten Carbide)
• Series: With Countersink for Through Holes

Approved Applications

• Multi-spindle CNC boring machines
• CNC boring centers
• Panel processing centers
• Boring machines with adapter or chuck
• Chipboard and particleboard panels
• MDF and HDF sheet goods
• Hardwood and softwood solid stock
• Plywood panels
• Laminates and coated panels
• Through-hole dowel joint drilling in furniture and cabinet manufacturing