CMT 381.100.12 4 Flute Dowel Drill for Through Holes by CMT is a precision-engineered left-hand rotation boring tool designed for clean, consistent through-hole drilling in solid wood, chipboard, MDF, HDF, plywood, laminates, and coated panels. With a 10mm diameter, 70mm cutting height, and 115mm total length, this extra-long series dowel drill is built for very thick panel applications where standard-length bits fall short. The tungsten carbide (HW) tipped head, 4 spiral flutes, and PTFE-coated spiral body make it a reliable choice for multi-spindle CNC boring machines, CNC boring centers, and panel processing equipment running left-hand spindles.

Key Features

• Tungsten Carbide (HW) Head with Precision Balanced Centre Point - the carbide tip maintains sharp cutting geometry through extended production runs, delivering accurate hole placement and reduced bit deflection in demanding panel work.
• 2 Precision Ground Cutting Edges (Z2) - negatively set, precision-ground spurs produce clean bore walls and smooth hole entry and exit faces, minimizing tearout on laminates and coated surfaces.
• 4 Spiral Flutes - four flutes provide efficient chip evacuation throughout the full 70mm cutting depth, keeping the hole clear and reducing heat buildup during through-hole operations.
• PTFE Non-Stick Coating on Spiral Portion - the orange or black PTFE coating prevents resin, pitch, and glue from adhering to the bit body, reducing cleaning time and extending effective tool life between sharpenings.
• Super-Strength Steel Body - the high-strength steel shank and body absorb vibration and resist flex, contributing to bore accuracy and consistent hole geometry across long production runs.
• 10x30mm Parallel Shank with Driving Flat and Length Adjusting Screw - the driving flat locks the bit securely against rotation in the chuck, while the adjusting screw allows precise depth setting directly on the machine without additional tooling.
• Left-Hand (LH) Rotation - engineered specifically for left-hand spindles found on multi-spindle CNC boring machines and panel processing centers, ensuring compatibility with LH-configured boring heads.
• Through Hole 60 deg. Tooth Geometry - the 60 deg. sharpening geometry is optimized for through-hole boring, supporting clean entry and full chip clearance all the way through the workpiece.

Why This Product

• Built for Very Thick Panels - at 115mm total length with a 70mm cutting height, this long-series dowel drill reaches through panel thicknesses that standard-length bits cannot, making it the right tool for thick engineered wood, stacked laminate, or heavy solid wood components.
• Reduces Downtime from Resin Buildup - the PTFE-coated spiral resists adhesive and pitch accumulation, so the bit stays cleaner longer and requires less frequent stopping to clean or replace, keeping production moving.
• Designed for CNC and Multi-Spindle Production Environments - the parallel shank with driving flat and length adjusting screw integrates directly into multi-spindle boring heads and CNC boring centers, simplifying setup and ensuring repeatable depth across all spindles.
• Clean Results on Finished and Coated Surfaces - precision-ground carbide cutting edges and controlled 60 deg. geometry deliver smooth hole walls and chip-free exits on laminates, melamine-coated panels, and hardwood faces where surface quality matters.

Specifications

• Manufacturer Part Number: 381.100.12
• Brand: CMT Orange Tools
• Diameter: 10mm
• Cutting Height: 70mm
• Total Length: 115mm
• Shank: 10x30mm
• Number of Teeth: 2
• Number of Flutes: 4
• Tooth Geometry: Through holes 60
• Rotation: Left-hand (LH)
• Blade Material: HW (Tungsten Carbide)
• Series: Through Hole Long Series (115mm)

Approved Applications

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