Product Description
CMT 367.080.12 Dowel Drill for Through Holes by CMT is a short-series, left-hand rotation boring bit engineered for clean, precise through-hole drilling in solid wood, chipboard, MDF, and laminated panels. With a 5/16" cutting diameter, a 30mm cutting height, and a carbide-tipped (HW) two-flute design, this dowel drill delivers flat-bottomed entry and blowout-free exit - making it a reliable choice for multi-spindle CNC boring machines, panel processing centers, and industrial boring systems that require left-hand tooling.
Key Features
- Tungsten Carbide (HW) Cutting Material - hard-wearing carbide edges stay sharp longer than high-speed steel alternatives, reducing downtime and tool change frequency in production environments.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring heads and CNC boring centers, ensuring correct chip evacuation and clean hole walls when used in the intended spindle slot.
- Two-Flute Through-Hole Geometry - the dual-flute configuration and through-hole cutting profile work together to prevent blowout on exit, producing smooth, consistent bore walls in both faces of the workpiece.
- Short-Series Length (56mm Overall) - the compact 56mm total length and 30mm cutting height reduce vibration and deflection during boring, improving hole accuracy and positional consistency across a full panel run.
- 8x20mm Parallel Shank - the standardized 8x20mm shank with driving flat seats securely in compatible boring machine chucks and adapters, preventing slippage under load and maintaining repeatable depth settings.
- 60 deg. Sharpening Angle for Through Holes - the precisely ground 60 deg. point geometry is optimized for through-hole applications, balancing cutting aggression with surface quality on both chipboard and laminate faces.
Why This Product
- Purpose-built for left-hand spindle positions - this bit eliminates the need for adapter workarounds on multi-spindle boring heads where LH tooling is required, ensuring the correct rotation direction for proper chip clearing and surface finish.
- The through-hole geometry with a 60 deg. sharpening angle is specifically configured to minimize tearout and fiber lifting on both the entry and exit faces - a critical requirement when drilling through laminated panels, MDF, and coated boards where surface defects are unacceptable.
- Carbide (HW) construction means the bit withstands the abrasive demands of chipboard, HDF, and laminate materials that quickly dull standard steel bits, keeping boring quality consistent across long production runs.
- The short-series 56mm overall length in combination with the 8x20mm standardized shank makes this bit a direct-fit replacement for existing tooling setups on CNC boring centers and panel processing equipment without requiring machine adjustments.
Specifications
- Manufacturer Part Number: 367.080.12
- Brand: CMT Orange Tools
- Diameter: 5/16"
- Cutting Height: 30mm
- Total Length: 56mm
- Shank: 8x20mm
- Number of Flutes: 2
- Rotation: Left-Hand (LH)
- Blade Material: HW (Tungsten Carbide)
- Sharpening: Through holes 60
- Series: Through Hole Short Series
Approved Applications
- Chipboard and particleboard panel boring
- MDF and HDF through-hole drilling
- Hardwood and softwood dowel boring
- Plywood panel processing
- Laminated and coated panel boring
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center tooling
- Boring machines with compatible chuck or adapter
Frequently Asked Questions
What does left-hand (LH) rotation mean and how do I know if this bit is right for my machine?
Left-hand rotation means the bit spins counter-clockwise when viewed from the shank end. Multi-spindle boring heads on CNC and industrial boring machines include both right-hand and left-hand spindle positions. This bit is designed for the LH spindle positions only. Installing an LH bit in an RH spindle - or vice versa - will produce poor cut quality and can damage the workpiece or tooling. Consult your machine's spindle layout to confirm LH positions before ordering.
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill, like this CMT 367.080.12, is ground with a geometry specifically configured to drill completely through the workpiece with a clean exit on both faces, minimizing blowout and fiber tearout. A blind-hole drill is designed to stop at a set depth without breaking through the opposite face. Using the correct type for your application is important - a blind-hole bit used for through drilling will typically produce a rough, torn exit face, which is unacceptable for laminated or coated panel work.
What shank size and type does this bit use, and will it fit my boring machine?
This bit uses an 8x20mm parallel shank with a driving flat. This is a widely used standard shank size on industrial multi-spindle boring heads and CNC boring centers. If your machine spindles accept 8mm shank tooling with a driving flat, this bit will fit directly. If your machine uses a different spindle bore size, a compatible adapter or chuck may be required. Always verify your machine's spindle specification before installing new tooling.
Is this bit suitable for drilling laminated panels and coated boards without surface chipping?
Yes. The two-flute through-hole geometry with a 60 deg. sharpening angle is configured to produce clean entry and exit holes in laminated panels, coated boards, MDF, and chipboard. The carbide (HW) cutting edges maintain sharpness against the abrasive resins and adhesives found in these engineered wood products, which helps reduce chipping and surface tearout compared to standard steel bits that dull quickly in these materials.
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