Product Description
CMT 308.080.11 Dowel Drill 5/16" x 30 x 57.5mm RH by CMT is a precision-engineered, right-hand rotation boring tool built for blind hole drilling in furniture manufacturing, cabinet making, and panel processing. Designed for clean, flat-bottom dowel holes in solid wood, chipboard, MDF, laminates, and coated panels, this short-series dowel drill delivers consistent bore quality across a wide range of sheet goods and hardwoods. Its tungsten carbide (HW) cutting head, PTFE-coated spiral flutes, and negatively ground spurs make it a reliable choice for high-cycle CNC boring operations where hole quality and tool longevity both matter.
Key Features
- Super-strength steel body with HW (tungsten carbide) cutting head - the carbide tip retains a sharp edge far longer than standard high-speed steel, reducing downtime and regrinding frequency in production environments.
- PTFE coating on the cutter portion (black or orange) - actively prevents pitch, resin, and glue buildup on the flutes, keeping the drill running cleanly through adhesive-prone materials like laminated chipboard and coated panels.
- Precision-balanced centre point - self-centers on contact, reducing bit walk and ensuring accurate hole placement for dowel connections that line up correctly every time.
- 2 precision-ground HW cutting edges (Z2) - carbide-tipped cutting lips deliver a flat, clean bore bottom suited to blind holes used in dowel joinery and panel assembly.
- 2 negatively ground spurs (V2) - score the perimeter of the hole before the main cutters engage, producing clean, tear-out-free entry points in chipboard, MDF, plywood, and veneered or laminated surfaces.
- 4 spiral flutes - efficiently evacuate chips and dust from the bore, reducing heat buildup and keeping the cutting zone clear during continuous boring cycles.
- Parallel shank (10x20mm) with driving flat and length-adjusting screw - secures positively in multi-spindle CNC boring machines and boring centers, preventing slippage and allowing precise depth setting.
Why This Product
- The 5/16" diameter fills a fractional-inch sizing gap that standard metric dowel drills do not cover, making it the right fit for projects that call for fractional dowel stock alongside panel drilling in a multi-spindle boring setup.
- The combination of negatively ground spurs and a PTFE-coated spiral means cleaner holes with less post-processing in laminated, coated, or veneered panels where surface quality at the bore opening is critical.
- At 57.5mm total length with a 30mm cutting height, this short-series drill is sized to work efficiently in compact multi-spindle boring heads and CNC boring centers without sacrificing cutting depth for furniture-grade blind hole work.
- HW (carbide) construction with a precision-balanced centre point supports high-cycle production use, maintaining dimensional accuracy and bore consistency across large panel batches in cabinet and furniture manufacturing.
Specifications
- Manufacturer Part Number: 308.080.11
- Brand: CMT Orange Tools
- Product Type: Dowel Drill
- Diameter: 5/16"
- Cutting Height: 30mm
- Total Length: 57.5mm
- Shank: 10x20mm parallel shank with driving flat and length adjusting screw
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Number of Flutes: 4
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (tungsten carbide)
- Rotation: Right-hand (RH)
- Coating: Black or orange PTFE on cutter portion
Approved Applications
- Blind hole drilling for dowel connections
- Panel drilling in furniture and cabinet manufacturing
- Boring operations in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center applications
- Boring machines fitted with an adapter or chuck
Frequently Asked Questions
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs (V2) score the perimeter of the hole before the main carbide cutting edges remove material. This pre-scoring action cleanly severs surface fibers, veneer, laminate, or coating at the bore opening - preventing tear-out and leaving a smooth, sharp-edged hole entry. This is especially important when boring coated panels, laminates, and veneered chipboard where surface appearance at the hole matters for finished furniture and cabinetry.
Why does this drill have a PTFE coating, and what materials benefit most from it?
The cutter portion is coated with a black or orange PTFE (polytetrafluoroethylene) finish. PTFE is a low-friction, non-stick material that prevents pitch, resin, and adhesive deposits from bonding to the flutes during cutting. Materials like laminated chipboard, MDF with adhesive overlays, and resin-treated panels tend to cause buildup on uncoated drills. The PTFE coating keeps the flutes clean through extended production runs, maintaining cutting efficiency and extending tool service life between sharpenings.
What machines is this dowel drill compatible with?
This drill uses a 10x20mm parallel shank with a driving flat and a length adjusting screw - a standard interface for multi-spindle CNC boring machines, CNC boring centers, and panel processing centers used in furniture and cabinet production. It can also be used in boring machines fitted with an appropriate adapter or chuck that accepts this shank format. The driving flat prevents rotation under load, and the length adjusting screw allows precise depth setting within the machine head.
What is the difference between the cutting height and the total length of this drill?
The total length of 57.5mm is the full dimension of the tool from the tip of the centre point to the end of the shank. The cutting height of 30mm is the usable bore depth - how deep the tool can cut into the workpiece. The remaining length is the shank (10x20mm), which is clamped in the machine. When setting up a boring head, the cutting height determines the maximum blind hole depth achievable, which for this short-series drill is 30mm - appropriate for standard dowel connection depths in furniture panel work.
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