Product Description
CMT 375.090.12 Four-Flute Dowel Drill for Through Holes is a left-hand rotation, long-series boring bit engineered for clean, precise through-hole drilling in panel processing applications. Built from tungsten carbide (HW), this 9mm diameter drill delivers consistent bore quality in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels. Designed for use in multi-spindle CNC boring machines and panel processing centers, it is an ideal choice for cabinet shops and woodworking operations that demand accuracy and repeatability across high-volume production runs.
Key Features
- Tungsten Carbide (HW) Construction - hard-wearing carbide material maintains a sharp cutting edge longer than high-speed steel, reducing downtime for tool changes in production environments.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, ensuring the bit engages the material correctly without deflection or wandering.
- Through-Hole 60 deg. Tooth Geometry - the 60 deg. point angle is optimized for through-hole boring, producing clean entry and exit faces with minimal tearout on both panel surfaces.
- 9mm Diameter with 40mm Cutting Height - the generous 40mm cutting height accommodates panels across a range of thicknesses in a single pass, improving workflow efficiency.
- 70mm Total Length Long-Series Design - the extended 70mm overall length allows the bit to reach deeper spindle configurations and provides clearance in tight multi-spindle head arrangements.
- 10x20mm Shank - the precision-ground shank fits standard boring machine chucks and adapters securely, minimizing runout and maintaining hole-position accuracy.
- 2-Tooth (2-Flute) Cutting Configuration - efficient chip evacuation through the flute design keeps the bore clear of debris, contributing to a cleaner finished hole in dense materials like MDF and laminates.
Why This Product
- The left-hand rotation matches the spindle direction on the corresponding left-hand positions of multi-spindle CNC boring heads, making this the correct replacement or upgrade choice for those stations without any modification to the machine setup.
- The 60 deg. through-hole geometry means the bit is purpose-built for drilling completely through panels - not for blind holes - so cabinet and furniture manufacturers get flat, consistent results on both faces of the workpiece.
- At 70mm total length with a 40mm cutting height, this long-series bit handles thicker panels that shorter-series drills cannot reach in one pass, reducing the need for repositioning or multiple operations.
- Tungsten carbide construction holds up under the repetitive, high-cycle demands of CNC and multi-spindle boring in abrasive materials like chipboard, MDF, and laminates, providing a longer service life compared to standard tool steel alternatives.
Specifications
- Manufacturer Part Number: 375.090.12
- Brand: CMT Orange Tools
- Diameter: 9mm
- Cutting Height: 40mm
- Total Length: 70mm
- Shank: 10x20mm
- Number of Teeth: 2
- Tooth Geometry: Through holes 60
- Rotation: Left-hand (LH)
- Blade Material: HW (Tungsten Carbide)
- Series: Through Hole Long Series (70mm)
Approved Applications
- Chipboard
- MDF
- HDF
- Hardwood
- Softwood
- Plywood
- Laminates
- Coated Panels
Frequently Asked Questions
What is the difference between a left-hand (LH) and right-hand (RH) dowel drill, and why does it matter?
Left-hand (LH) drills rotate counterclockwise when viewed from the shank end. Multi-spindle boring machines use both LH and RH spindles positioned across the head, and each spindle position requires a bit with the matching rotation. Installing an LH bit such as this one on an RH spindle - or vice versa - will cause the bit to back out of the material rather than cut into it. Always verify the spindle rotation before selecting a dowel drill.
Is this bit designed for through holes or blind (flat-bottom) holes?
This bit is specifically engineered for through holes. The 60 deg. point geometry is optimized to exit cleanly through the opposite face of the panel. It is not intended for flat-bottom or blind-hole applications, which require a different point geometry and drill series.
What machines is this dowel drill compatible with?
This drill is compatible with multi-spindle CNC boring machines, CNC boring centers, panel processing centers, and boring machines equipped with an appropriate adapter or chuck that accepts a 10x20mm shank. Confirm that your machine's spindle accepts a 10mm shank diameter before installing.
What does the "long series" designation mean for this drill?
The long-series designation refers to the 70mm total length of this bit, which is longer than standard-series dowel drills. This extended length provides the reach needed for deeper spindle configurations and allows drilling through thicker panels - up to the 40mm cutting height - in a single operation without repositioning the workpiece.
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