Product Description
CMT Dowel Drill with Countersink - 10x20x57mm, Left-Hand Rotation is a precision boring tool engineered for drilling and countersinking in a single pass on CNC boring machines and multi-spindle panel processing equipment. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotation drill delivers clean, flat-bottom holes with a precisely recessed shoulder for bolt heads and panel connectors - making it a reliable choice for production woodworking and cabinet manufacturing operations.
Key Features
- Tungsten Carbide (HW) Cutting Head with 2 Precision-Ground Cutting Edges (Z2) - hard carbide construction stays sharp through demanding production runs in chipboard, MDF, hardwood, and coated panels, reducing tool change frequency and downtime.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry severs wood fibers cleanly before the main cutting edges engage, producing smooth bore walls and chip-free entry points on laminates and coated panels where surface quality is critical.
- Integrated Countersink Geometry - combines drilling and countersinking into a single plunge, eliminating the need for a separate countersink step and saving cycle time on bolt-head and connector-recess operations.
- PTFE-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion prevents pitch and adhesive buildup, maintaining consistent chip evacuation and extending usable tool life between sharpenings.
- Precision-Balanced Centre Point - the HW centre point self-registers accurately on the workpiece, reducing wander at entry and ensuring repeatable hole positioning across high-volume panel runs.
- Parallel Shank with Driving Flat and Length-Adjusting Screw (10x20mm) - the flat-sided shank locks securely in boring machine collets and allows precise depth adjustment, maintaining consistent countersink depth from part to part.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, ensuring proper cutting geometry and clean chip ejection on the correct rotation side.
- 2 Spiral Flutes - dual flute design balances cutting load and chip clearance, supporting smooth operation and reduced heat buildup during continuous drilling cycles.
Why This Product
- The combined drill-and-countersink geometry eliminates a secondary machining step, making this tool well suited for production environments where cycle time and throughput on panel connector recessing directly affect output.
- The negatively ground spurs and carbide cutting head work together to produce clean-edged holes in demanding materials like melamine-coated panels and laminates, where tear-out or chipping would require rework or rejection.
- The PTFE-coated spiral resists adhesive and pitch accumulation - a practical advantage when processing glue-coated dowel holes or working with resin-rich materials that tend to load standard tool flutes quickly.
- The 10x20mm parallel shank with driving flat and adjusting screw provides positive, repeatable engagement in CNC boring machine collets, supporting consistent hole depth across long production runs without manual re-setting between parts.
Specifications
- Manufacturer Part Number: 376.102.12
- Brand: CMT Orange Tools
- Diameter: 10mm
- Cutting Height: 20mm
- Total Length: 57.5mm
- Shank: 10x20mm
- Rotation: LH (Left-Hand)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Number of Spiral Flutes: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Body Material: Super-strength steel
- Spiral Coating: P.T.F.E. (orange or black)
Approved Applications
- Drilling and countersinking in one pass on CNC boring machines
- Bolt head and connector recess drilling in panel components
- Dowel hole boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
- Left-hand spindle positions on multi-spindle CNC boring machines and boring centers
- Panel processing on CNC boring centers and panel processing centers
- Use on boring machines equipped with an adapter or chuck accepting a 10x20mm parallel shank
Frequently Asked Questions
What is the difference between this drill and a standard dowel drill without a countersink?
This tool combines a standard dowel drill with an integrated countersink geometry, allowing it to drill the dowel hole and create a clean recessed shoulder for bolt heads or connectors in a single plunge. A standard dowel drill without a countersink would require a separate tool or operation to create that recess.
Why does this tool have left-hand (LH) rotation, and how do I know if my machine uses it?
Left-hand rotation means the cutting edges are oriented to cut when the spindle turns counter-clockwise. Multi-spindle CNC boring machines and boring centers commonly use both right-hand and left-hand spindle positions to cover all hole patterns across a panel in one pass. Your machine's spindle layout or tooling chart will indicate which positions require LH tools - this drill is designed specifically for those left-hand spindle locations.
What does the PTFE coating on the spiral flutes do, and does it affect tool sharpening?
The P.T.F.E. coating on the spiral portion prevents pitch and adhesive glue from bonding to the flutes, maintaining clean chip evacuation throughout the tool's service life. The source data notes that the spurs are negatively ground and the tool is designed for resharpening - the coating is applied to the spiral, while the carbide cutting head and spurs are the ground surfaces.
Which materials is this dowel drill with countersink designed to cut?
The carbide-tipped cutting head and negatively ground spur geometry make this tool suitable for chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels - the full range of sheet goods and solid wood materials encountered in furniture and cabinet panel processing.
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