Product Description
CMT 375.040.12 4 Flute Dowel Drill for Through Hole is a precision-engineered left-hand rotation boring tool designed for clean, accurate through-hole dowel drilling in a wide range of wood-based panel materials. Built to CMT standards with a tungsten carbide (HW) cutting edge, this long-series drill features a 4mm cutting diameter and a 70mm overall length, making it well suited for multi-spindle CNC boring machines, CNC boring centers, and panel processing centers that demand consistent, repeatable results. Whether you are processing solid hardwood, softwood, chipboard, MDF, or coated laminates, this left-hand drill delivers flat-bottom entry and clean bore walls with minimal tearout - exactly what cabinet and furniture panel production requires.
Key Features
- Tungsten Carbide (HW) Cutting Material - hard carbide construction maintains a sharp cutting edge through extended production runs on abrasive materials like chipboard, MDF, and coated panels, reducing downtime for tool changes.
- 4mm Cutting Diameter with 40mm Cutting Height - the generous cutting height relative to diameter allows the drill to bore through panels across a practical range of thicknesses in a single plunge, improving throughput on panel processing lines.
- 70mm Total Length (Long Series) - the long-series body provides the reach needed for through-hole boring applications where a shorter drill would bottom out before completing the cut.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring heads, ensuring correct chip evacuation direction and clean hole geometry when paired with the appropriate machine spindle.
- 10x20mm Shank - the precision-ground shank seats securely in compatible boring machine chucks and spindle blocks, minimizing runout and contributing to hole accuracy across high-cycle production environments.
- Through Hole 60 deg. Tooth Geometry (2 Teeth) - the 60 deg. tip geometry optimized for through-hole drilling produces clean entry and exit points, reducing the need for secondary finishing operations on visible panel faces.
- 2-Tooth Configuration - a 2-flute design balances chip clearance with cutting efficiency, helping prevent clogging and heat buildup during continuous drilling cycles on dense engineered wood panels.
Why This Product
- The long-series 70mm body combined with a 40mm cutting height makes this drill the right choice when through-hole boring is required across the full panel thickness - a shorter drill simply cannot complete the cut cleanly.
- Left-hand rotation is a specific mechanical requirement on many multi-spindle boring heads; this drill is purpose-built for those LH spindle positions, eliminating the need to adapt a right-hand tool to an incompatible machine setup.
- Tungsten carbide (HW) construction stands up to the abrasive resins and adhesives present in chipboard, MDF, HDF, and laminated panel materials, delivering longer service life compared to high-speed steel alternatives in production environments.
- The 60 deg. through-hole geometry produces accurate, clean-walled bores suited for dowel joinery and assembly applications where hole quality directly affects panel alignment and finished product quality.
Specifications
- Manufacturer Part Number: 375.040.12
- Brand: CMT Orange Tools
- Diameter: 4mm
- Cutting Height: 40mm
- Total Length: 70mm
- Shank: 10x20mm
- Number of Teeth: 2
- Tooth Geometry: Through holes 60
- Rotation: Left-hand (LH)
- Blade Material: Tungsten Carbide (HW)
- Series: Through Hole Long Series (70mm)
Approved Applications
- Chipboard
- MDF
- HDF
- Hardwood
- Softwood
- Plywood
- Laminates
- Coated Panels
Frequently Asked Questions
What machines is this through-hole dowel drill compatible with?
This drill is designed for use in multi-spindle CNC boring machines, CNC boring centers, panel processing centers, and boring machines equipped with an adapter or chuck that accepts a 10x20mm shank. Always confirm that your machine's spindle block is configured for left-hand (LH) rotation before installing this tool.
Why does this drill use left-hand (LH) rotation?
Multi-spindle boring heads are typically configured with both right-hand and left-hand spindle positions to allow simultaneous drilling from multiple angles. This CMT drill is engineered specifically for the left-hand spindle positions, where LH rotation is required to achieve proper cutting action and clean chip evacuation. Using a right-hand drill in a left-hand spindle - or vice versa - will damage the tool and produce poor hole quality.
What does the 60 deg. through-hole tooth geometry mean for hole quality?
The 60 deg. tip angle is optimized for through-hole boring applications, meaning the drill is designed to enter and exit the panel cleanly without excessive tearout on either face. This geometry is particularly important when drilling through coated panels, laminates, and hardwood where surface quality on both faces of the board matters for assembly and appearance.
What is the difference between this long-series drill and a standard-series dowel drill?
This drill belongs to the through-hole long series with a 70mm total length and a 40mm cutting height. The extended body length provides the reach needed to bore completely through a panel in a single plunge, which a shorter standard-series drill may not achieve. If your application involves through-hole drilling rather than blind-hole drilling, a long-series drill like this one is the appropriate choice.
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