Product Description
CMT Dowel Drill with Countersink - 5/16" Diameter, Left-Hand Rotation, 10x28mm Shank is a precision boring tool engineered for drilling and countersinking in a single pass on horizontal boring machines and CNC boring centers. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotating dowel drill is purpose-built for clean, accurate holes in panel materials, furniture components, and cabinet construction. The integrated countersink creates a neat recess for bolt heads and panel connectors without a secondary operation, saving time and reducing tool changes on production lines.
Key Features
- Carbide (HW) Cutting Head with Precision-Balanced Centre Point - the tungsten carbide tip maintains a sharp, accurate entry point through demanding production runs, reducing wandering and delivering consistent hole positioning across repeated operations.
- 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges distribute cutting load evenly, producing flat-bottomed holes with minimal tearout and extending overall tool life in high-volume boring applications.
- 2 Ground Spurs with Negatively Ground Sharpening (V2) - negatively ground spurs score the material fibers ahead of the main cutters, resulting in clean bore walls and crisp edges on chipboard, MDF, laminates, and coated panels where surface quality is critical.
- 2 Spiral Flutes with PTFE Coating - the orange or black PTFE coating on the spiral portion prevents pitch and glue buildup, keeping flutes clear during cutting and reducing the need for cleaning stops during production.
- Integrated Countersink - combines drilling and countersinking into one tool and one pass, eliminating a secondary operation for bolt-head or connector recessing and improving throughput on panel processing equipment.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, ensuring correct cutting geometry and optimal chip evacuation without tool regrinding or improvised setups.
- Parallel Shank with Driving Flat and Length Adjusting Screw (10x28mm) - the standardized 10x28mm shank with a driving flat locks securely in boring machine chucks or adapters, while the length adjusting screw allows precise depth setting for repeatable countersink depth across a batch.
- Super-Strength Steel Body - provides the structural rigidity needed to resist flex and vibration during high-speed boring, supporting accurate hole geometry and reducing bit breakage risk.
Why This Product
- One-pass drilling and countersinking - this tool eliminates the need to swap between a dowel drill and a separate countersink bit, cutting cycle time on boring machines and reducing tooling inventory for shops processing large panel volumes.
- Engineered for left-hand spindle positions - LH rotation is not an afterthought here but the designed cutting direction, meaning spurs, flutes, and cutting edges all work correctly in left-hand spindle bores without compromise to hole quality or tool integrity.
- PTFE-coated flutes resist pitch and glue buildup - in furniture and cabinet production where glued or pre-coated panels are common, the PTFE coating keeps the tool running cleanly longer between service intervals, supporting consistent output quality.
- Negatively ground spurs protect surface finish - for applications involving laminates, coated panels, and veneered board where visible chip-out at the bore entry is unacceptable, the negatively ground V2 spurs cleanly score the surface layer before cutting begins.
Specifications
- Manufacturer Part Number: 376.080.12
- Brand: CMT Orange Tools
- Diameter: 5/16"
- Cutting Height: 12mm
- Total Length: 57.5mm
- Shank: 10x28mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Number of Flutes: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: Carbide (HW)
- Body Material: Super-strength steel
- Coating: PTFE (orange or black) on spiral portion
- Tool Type: Dowel Drill with Countersink
Approved Applications
- Drilling and countersinking in one pass on horizontal boring machines
- Bolt head and panel connector recessing
- Dowel hole boring in furniture and cabinet panel components
- Panel processing on multi-spindle CNC boring machines and boring centers
- Boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
Frequently Asked Questions
What is the difference between this dowel drill and a standard dowel drill without a countersink?
This CMT 376.080.12 includes an integrated countersink in addition to the dowel drill geometry. That means the tool drills the dowel hole and simultaneously creates a recessed seat for a bolt head or panel connector in a single pass, eliminating the need for a second tool or a second machine cycle.
Why does this drill have left-hand (LH) rotation, and does that affect how I set up my machine?
Left-hand rotation is required for left-hand spindle positions on multi-spindle horizontal boring machines. The cutting edges, spurs, and flute geometry are all oriented for LH rotation, so the tool must be used on a spindle running in the correct left-hand direction. Using it on a right-hand spindle will not produce a proper cut and will damage the tool.
What does the PTFE coating on the spiral portion do?
The PTFE coating on the spiral flutes resists the buildup of pitch, resins, and glue that are commonly present in manufactured wood panels, MDF, laminates, and pre-glued components. This keeps the flutes clear during cutting, helps maintain chip evacuation efficiency, and extends the interval between cleaning or tool service.
How does the length adjusting screw on the shank work?
The 10x28mm parallel shank includes a driving flat for positive chuck engagement and a length adjusting screw that allows you to fine-tune the axial projection of the bit in the chuck. This makes it straightforward to set a precise and repeatable countersink depth across an entire batch of panels without manually measuring each setup.
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