Product Description
CMT 374.050.12 4 Flute Dowel Drill for Through Holes by CMT is a precision-engineered left-hand rotation boring bit designed for clean, accurate through-hole drilling in solid wood, chipboard, MDF, HDF, plywood, laminates, and coated panels. Built with a tungsten carbide (HW) cutting edge and a 5mm diameter profile, this dowel drill delivers consistent bore quality on multi-spindle CNC boring machines, CNC boring centers, and panel processing equipment where left-hand spindle configurations are standard. The through-hole geometry with a 60 deg. sharpening angle prevents blowout on the exit side, making it a reliable choice for high-volume cabinet and furniture panel production.
Key Features
- Tungsten Carbide (HW) Cutting Material - provides long-lasting edge retention and resists wear when boring abrasive engineered panels like MDF, chipboard, and laminates, reducing tool change frequency in production environments.
- Through-Hole Geometry with 60 deg. Sharpening Angle - engineered specifically for complete through-hole passes, this geometry minimizes fiber tearout and prevents blowout on the exit face, delivering clean, splinter-free bores on both sides of the panel.
- Left-Hand (LH) Rotation - matches left-hand spindle configurations found on multi-spindle CNC boring machines and panel processing centers, ensuring proper chip evacuation direction and correct cutting action without spindle adapter complications.
- 5mm Diameter with 30mm Cutting Height - the cutting height accommodates standard panel thicknesses used in cabinet and furniture construction, giving the bit full engagement length for straight, square through-holes.
- 10x20mm Shank - the robust shank dimensions provide a secure, vibration-resistant fit in compatible boring machine chucks and adapters, supporting accurate hole placement and consistent results across large panel runs.
- 2 Cutting Teeth - balanced tooth geometry promotes smooth chip flow and reduces heat buildup during continuous production boring cycles, extending service life between sharpenings.
Why This Product
- The through-hole design with a 60 deg. sharpening angle directly solves one of the most common production quality problems - exit-side blowout - making this bit ideal for furniture and cabinet panels where both faces are visible in the finished product.
- The left-hand rotation is a precise specification match for LH spindle stations on multi-spindle CNC boring centers, eliminating the need for workaround adapters and keeping setup time minimal on production lines.
- Tungsten carbide (HW) construction means the bit maintains a sharp cutting edge through demanding runs on abrasive engineered wood products like MDF and coated panels, offering a longer service interval compared to standard steel alternatives.
- With a total length of 57.5mm and a 10x20mm shank, this bit fits the physical envelope of standard CNC boring machine tooling positions, making it a straightforward drop-in specification for shops already running CMT 374 series tooling.
Specifications
- Manufacturer Part Number: 374.050.12
- Brand: CMT Orange Tools
- Diameter: 5mm
- Cutting Height: 30mm
- Total Length: 57.5mm
- Shank: 10x20mm
- Number of Teeth: 2
- Rotation: Left-hand (LH)
- Tooth Geometry: Through holes 60
- Blade Material: Tungsten Carbide (HW)
- Product Type: Through-Hole Dowel Drill
- Series: Through Hole Series
Approved Applications
- Chipboard
- MDF
- HDF
- Hardwood
- Softwood
- Plywood
- Laminates
- Coated Panels
Frequently Asked Questions
What machines is this dowel drill compatible with?
This bit is designed for use on multi-spindle CNC boring machines, CNC boring centers, panel processing centers, and boring machines equipped with a compatible adapter or chuck that accepts a 10x20mm shank in a left-hand rotation spindle station.
What does left-hand (LH) rotation mean, and why does it matter?
Left-hand rotation means the bit is designed to spin counterclockwise when viewed from the shank end. This matches LH spindle stations found on multi-spindle boring machines. Using a LH bit on the correct spindle ensures proper cutting action, correct chip evacuation, and clean bore walls. Installing a LH bit on a right-hand spindle would produce poor results and risk tool damage.
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill, like this CMT 374.050.12, is sharpened and geometrically optimized to pass completely through the workpiece. The 60 deg. sharpening angle helps minimize fiber tearout and blowout as the bit exits the back face of the panel. A blind-hole drill is designed to stop at a set depth without breaking through. Using the correct type for the intended hole is critical to achieving clean, production-quality results.
Can this bit be resharpened?
Yes. The sharpening specification for this bit is listed as "Through holes 60," indicating it is designed to be resharpened at a 60 deg. angle on the through-hole geometry. Resharpening should be performed by a qualified tool grinding service familiar with carbide dowel drill geometry to preserve the original cutting profile and performance.
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