CMT Dowel Drill with Countersink - 5/16" x 15 x 70mm, 10x38mm Shank, Left-Hand Rotation by CMT is a precision-engineered boring tool designed for drilling and countersinking in a single pass. Built for use in multi-spindle CNC boring machines, panel processing centers, and boring machines with an adapter or chuck, this left-hand rotation dowel drill handles chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels with consistent, clean results. The integrated countersink creates a recessed seat for bolt heads and connectors in thicker panel stock, eliminating the need for a secondary tool operation.

Key Features

• Tungsten Carbide (HW) Cutting Head - the carbide tip holds a sharp edge through high-volume production runs, reducing tool change frequency and downtime on CNC boring centers and panel lines.
• Super-Strength Steel Body - provides the structural rigidity needed to maintain accurate hole geometry even under the demands of continuous machine operation.
• PTFE Coating on Spiral Portion - the non-stick orange or black PTFE finish prevents pitch and glue buildup on the flutes, keeping the tool running cleanly through adhesive-coated and laminated panels.
• Precision-Ground Centre Point - the precision balanced centre point self-locates accurately on the workpiece surface, delivering consistent bore placement across every panel in a production run.
• 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges produce a smooth, flat-bottom hole with minimal fiber tearout, which is critical for clean connector and dowel seating in finished panels.
• 2 Ground Spurs (V2) - the paired ground spurs score the panel surface cleanly before material removal begins, resulting in crisp bore edges on laminates and coated surfaces.
• 2 Spiral Flutes - efficient chip evacuation through the dual flute geometry reduces heat buildup and prevents recutting of chips, extending tool life in repetitive boring applications.
• Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10x38mm shank locks securely in machine spindles and allows precise depth setting, ensuring repeatable countersink depth across all panels.
• Left-Hand Rotation (LH) - designed specifically for left-hand spindle positions on multi-spindle boring machines, allowing proper tool engagement and clean cutting action without material distortion.
• Integrated Countersink Function - combines drilling and countersinking in one operation, reducing cycle time and the number of tool positions required on a boring center.

Why This Product

• Combines drilling and countersinking into a single pass, cutting cycle time and reducing the number of spindle positions needed on multi-spindle CNC boring machines and panel processing centers.
• The carbide (HW) head paired with PTFE flute coating addresses two of the most common causes of boring tool failure - edge dulling and resin buildup - making this drill well-suited to high-volume panel production with adhesive-coated or laminated sheet goods.
• The 5/16" diameter with a 15mm cutting height and 70mm overall length is sized for connector and bolt-head recessing in thicker panel stock, where standard-length dowel drills cannot reach the required depth.
• Left-hand rotation configuration fills a specific spindle requirement on multi-head boring machines, providing a direct, purpose-built replacement rather than a workaround adapter solution.

Specifications

• Manufacturer Part Number: 377.081.12
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 15mm
• Total Length: 70mm
• Shank: 10x38mm
• Rotation: LH (Left-Hand)
• Number of Cutting Edges: 2
• Number of Spurs: 2
• Blade Material: HW (Tungsten Carbide)

Approved Applications

• Drilling and Countersinking in One Pass
• Bolt Head and Connector Recessing
• Panel Processing
• Dowel Hole Boring with Integrated Countersink on Chipboard, MDF, HDF, Hardwood, Softwood, Plywood, Laminates, and Coated Panels