Product Description
CMT Two Flute Dowel Drill for Through Holes - 5x44x77mm Left-Hand Rotation is a precision-engineered carbide-tipped boring tool built for clean, accurate through-hole drilling in furniture manufacturing, panel processing, and dowel joinery applications. Designed for multi-spindle CNC boring machines and boring centers, this left-hand (LH) rotation drill features a hardmetal (HW) head with a precision balanced centre point and 2 spiral flutes coated with P.T.F.E. to resist pitch and glue buildup during continuous production runs. Whether you are machining chipboard, MDF, solid wood, or coated laminates, this through-hole dowel drill delivers consistent bore quality and extended tool life across demanding production environments.
Key Features
- Hardmetal (HW) Carbide Head with Precision Balanced Centre Point - the tungsten carbide cutting head provides superior hardness and wear resistance, and the balanced centre point ensures accurate hole registration on entry, reducing drift and maintaining positional accuracy across repeated drilling cycles.
- 2 Precision Ground Cutting Edges (Z2) - dual precision-ground flutes produce clean bore walls as the drill passes completely through the panel, making this tool ideal for through-hole dowel connections where exit-side quality matters.
- P.T.F.E.-Coated Spiral Flutes - the orange or black polytetrafluoroethylene coating on the spiral portion prevents resin, pitch, and adhesive buildup, reducing cleaning downtime and maintaining consistent chip evacuation during high-volume panel drilling.
- Super-Strength Steel Body - the steel shank and body provide the rigidity needed to resist deflection under the lateral forces common in multi-spindle boring operations, supporting consistent hole positioning.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x26mm parallel shank includes a driving flat for positive torque transfer and a length adjusting screw for precise depth setting, ensuring repeatable hole depths across all spindles in a multi-head machine setup.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, allowing correct pairing with right-hand drills on the same machine for balanced, simultaneous through-hole drilling.
- 44mm Cutting Height in a 77mm Overall Length - the extended cutting length relative to the total tool length allows this drill to handle deep through-holes in thick panels without requiring a longer, less rigid tool body.
- Through-Hole Geometry (60 deg. Sharpening Angle) - optimised for drilling completely through panels rather than blind holes, producing clean entry and exit points suitable for dowel joint assembly and panel-to-panel connections.
Why This Product
- The P.T.F.E.-coated spiral flutes and HW carbide head work together to extend tool life and reduce maintenance intervals in high-cycle furniture production and panel processing environments - fewer tool changes means more uptime on the boring machine.
- The left-hand rotation configuration makes this drill a direct match for LH spindle positions on multi-spindle CNC boring machines and boring centers, eliminating the need for spindle adapters or workarounds when drilling symmetrical through-hole patterns.
- The precision balanced centre point and 2 precision-ground cutting edges (Z2) ensure accurate hole placement and clean bore walls on every pass - critical for tight-tolerance dowel joint connections in furniture manufacturing and panel assembly.
- The parallel shank with driving flat and length adjusting screw gives the operator positive tool engagement and repeatable depth control, reducing setup time when running matched sets of LH and RH drills across a multi-spindle boring head.
Specifications
- Manufacturer Part Number: 366.050.12
- Brand: CMT Orange Tools
- Diameter: 5mm
- Cutting Height: 44mm
- Total Length: 77mm
- Shank: 10x26mm
- Number of Flutes: 2
- Rotation: LH (Left-Hand)
- Blade Material: HW (Hardmetal / Carbide)
- Sharpening Angle: Through holes 60 deg.
- Series: Through Hole Long Series (77mm)
Approved Applications
- Drilling through holes for dowel connections in furniture manufacturing
- Panel processing and panel-to-panel assembly
- Through-hole boring in chipboard, MDF, HDF, and coated panels
- Through-hole drilling in solid hardwood, softwood, and plywood
- Multi-spindle CNC boring machine and boring center operations
- CNC boring center and panel processing center applications
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill is sharpened and geometrically optimised to pass completely through the panel material, producing clean entry and exit points on both faces. This CMT 366.050.12 uses a 60 deg. through-hole sharpening angle and 2 precision-ground flutes designed for that purpose. A blind-hole drill is instead configured to stop at a set depth without exiting the back face of the panel. Using the correct type for your application is important for bore quality and joint fit.
Why does this drill have a left-hand (LH) rotation, and how do I know if my machine requires it?
Left-hand rotation means the drill spins counter-clockwise when viewed from the cutting tip. Multi-spindle boring machines and CNC boring centers typically have both left-hand and right-hand spindle positions so that paired drills can operate simultaneously on both sides of a panel or at mirrored locations. If your machine spindle turns counter-clockwise, you need an LH drill like this one. Check your machine's spindle rotation specification or boring head layout to confirm whether your target spindle position requires LH or RH tooling before ordering.
What materials can this CMT through-hole dowel drill be used on?
The HW (hardmetal carbide) cutting head and through-hole geometry make this drill suitable for chipboard, MDF, HDF, solid hardwood, softwood, plywood, laminates, and coated panels. The P.T.F.E.-coated spiral flutes help manage chip evacuation and resist adhesive buildup across all of these materials, supporting consistent performance in mixed-panel production environments.
What does the length adjusting screw on the shank do?
The length adjusting screw on the parallel shank allows the operator to set the precise projection length of the drill from the spindle or chuck. This is especially important on multi-spindle boring machines where all spindles must be set to exactly the same drilling depth to produce consistent, matched through-holes across the full width of a panel. The driving flat on the 10x26mm shank ensures positive torque transfer so the drill does not slip during operation.
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