Product Description
CMT Dowel Drill with Countersink - 10x20x70mm, 10x33mm Shank, Left-Hand Rotation by CMT is a precision-engineered boring tool built for professional panel processing applications. Combining a dowel drill and countersink in a single pass, this left-hand (LH) rotation bit drills clean, accurate holes while simultaneously recessing bolt heads or hardware connectors - eliminating a separate countersinking step and increasing throughput on chipboard, MDF, hardwood, plywood, and coated panel stock. With a carbide-tipped (HW) cutting head, PTFE-coated spiral flutes, and a parallel shank with driving flat and length adjusting screw, this tool is designed for multi-spindle CNC boring machines, CNC boring centers, and panel processing equipment.
Key Features
- HW (Tungsten Carbide) Cutting Head - delivers long-lasting edge retention and clean cutting performance in dense panel materials like MDF, chipboard, and hardwood, reducing regrind frequency and downtime.
- Dowel Drill with Integrated Countersink - drills and countersinks in a single operation, saving cycle time and eliminating the need for a secondary tooling pass when recessing bolt heads or panel connectors.
- PTFE-Coated Spiral Flutes - the orange or black PTFE non-stick coating on the spiral portion resists pitch and glue buildup, keeping flutes clear and maintaining consistent chip evacuation over extended production runs.
- Precision-Ground Centre Point - the precision balanced HW centre point locates accurately on the workpiece, reducing walking and ensuring repeatable hole placement across high-volume boring operations.
- 2 Precision-Ground Cutting Edges (Z2) - dual ground cutting edges produce flat-bottomed holes with smooth bore walls and minimal tearout on laminates, coated panels, and veneered stock.
- 2 Ground Spurs (V2) - outside spurs score the panel surface cleanly before the main cutting edges engage, preventing chipout and delamination on coated or laminated panels.
- Super-Strength Steel Body - robust body construction supports the HW tip under high-cycle CNC boring loads, reducing the risk of flex or vibration that can compromise hole quality.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x33mm shank seats securely in standard boring machine chucks and allows precise depth adjustment, ensuring consistent countersink depth across all spindles.
- Left-Hand (LH) Rotation - matches the dedicated LH spindle positions on multi-spindle boring machines, ensuring correct chip evacuation direction and clean hole geometry when used in the appropriate spindle.
- 10mm Diameter, 20mm Cutting Height, 70mm Overall Length - proportions suited to doweling and connector-recessing operations in standard panel thicknesses without interference from adjacent spindles.
Why This Product
- Drilling and countersinking happen simultaneously in one tool pass - a direct result of the integrated countersink geometry - which reduces tooling changes and speeds up panel processing workflows on CNC boring centers and multi-spindle machines.
- The PTFE-coated spiral and precision-ground HW head work together to maintain cut quality over long production runs in glue-prone or resin-rich materials like MDF and chipboard, reducing cleaning stops and extending tool life between services.
- With 2 ground spurs (V2) and 2 precision cutting edges (Z2), this bit produces clean entry and exit points on coated, laminated, and veneered panel stock - making it a practical choice when surface quality on finished panels is a requirement.
- The left-hand rotation designation and 10x33mm parallel shank with driving flat and length adjusting screw make this a direct-fit replacement or addition for LH spindle positions on standard multi-spindle CNC boring machines and panel processing centers.
Specifications
- Manufacturer Part Number: 377.102.12
- Brand: CMT Orange Tools
- Diameter: 10mm
- Cutting Height: 20mm
- Total Length: 70mm
- Shank: 10x33mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Number of Spiral Flutes: 2
- Blade Material: HW (Tungsten Carbide)
- Body Material: Super-Strength Steel
- Spiral Coating: PTFE (orange or black)
- Shank Style: Parallel with driving flat and length adjusting screw
- Tool Type: Dowel Drill with Countersink
Approved Applications
- Drilling and countersinking in one pass on panel stock
- Bolt head and hardware connector recessing
- Dowel hole boring in cabinet and furniture panel production
- Panel processing on multi-spindle CNC boring machines and boring centers
- Chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panel boring
Frequently Asked Questions
What is the difference between a standard dowel drill and this dowel drill with countersink?
A standard dowel drill creates a cylindrical hole for a dowel pin. This CMT 377.102.12 adds an integrated countersink geometry to the same tool, so it drills the dowel bore and recesses the entry point for a bolt head or connector in a single spindle pass - eliminating a separate countersinking operation and reducing cycle time in panel production.
Why does this drill use left-hand (LH) rotation, and does it matter which spindle I use it in?
Yes, rotation direction is critical. Multi-spindle CNC boring machines and panel processing centers include dedicated left-hand spindle positions specifically designed to turn LH tools. Using this bit in an LH spindle ensures correct chip evacuation direction, proper cutting geometry engagement, and clean hole quality. Installing an LH bit in a right-hand spindle will produce poor results and may damage the tool or workpiece.
Will the PTFE coating on the spiral flutes wear off during normal use, and does it affect cutting performance?
The PTFE coating on the spiral portion is designed to resist pitch and glue buildup during normal production use in materials like MDF, chipboard, and laminated panels. Its primary function is to keep the flutes clear so chips evacuate efficiently, maintaining consistent feed rates and hole quality without frequent cleaning stops. The coating is applied to the spiral, not the cutting edges, so it does not affect the sharpness or geometry of the HW cutting head or ground spurs.
What does the length adjusting screw on the shank do?
The parallel 10x33mm shank includes a driving flat and a length adjusting screw that allows the operator to set and lock the tool projection depth precisely in the boring machine chuck or adapter. This ensures that the countersink depth is consistent and repeatable across all spindles in a multi-spindle setup, which is important when processing large batches of panels to the same specification.
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