CMT Dowel Drill with Countersink - 5/16" x 12 x 70mm, 10x41mm Shank, Left-Hand Rotation by CMT is a precision boring tool engineered for dowel hole drilling and countersinking in a single pass. Designed for use in multi-spindle CNC boring machines, panel processing centers, and CNC boring centers, this left-hand (LH) rotating drill combines a tungsten carbide (HW) cutting head with a super-strength steel body to deliver clean, accurate bores in chipboard, MDF, hardwood, plywood, and coated panel stock. The integrated countersink feature creates a flush recess for bolt heads and connectors in thicker panels, eliminating a separate operation and improving throughput on production boring lines.

Key Features

• HW (Tungsten Carbide) Cutting Head - delivers long service life and consistent cut quality in abrasive materials like chipboard, MDF, and laminate-coated panels, reducing replacement frequency on high-cycle boring lines.
• 2 Precision-Ground Cutting Edges (Z2) - provide balanced cutting forces and clean, flat-bottom holes with minimal fiber tearout, ensuring a professional bore finish on every pass.
• 2 Ground Spurs (V2) - score the panel surface cleanly ahead of the main cutting edges, producing crisp bore walls with no ragged edges, even on laminates and coated panels.
• 2 Spiral Flutes with PTFE Coating - the orange or black P.T.F.E. non-stick coating on the spiral portion prevents pitch and adhesive buildup, keeping the tool running freely and extending tool life between cleanings.
• Integrated Countersink - machines the dowel hole and bolt-head or connector recess simultaneously, eliminating a secondary boring step and saving time on panel processing operations.
• Precision-Balanced Centre Point - locates the drill accurately on the bore center at entry, preventing walking and ensuring repeatable hole placement across high-volume production runs.
• Parallel Shank with Driving Flat and Length Adjusting Screw - the 10x41mm shank seats securely in boring machine spindles with positive drive engagement, while the adjusting screw allows precise depth setting without additional fixtures.
• Left-Hand (LH) Rotation - matched to left-hand spindles on multi-spindle CNC boring machines and panel processing centers, ensuring correct chip evacuation direction and clean bore geometry.

Why This Product

• Drilling and countersinking happen in one pass - this tool bores the dowel hole and creates the bolt-head or connector recess simultaneously, cutting cycle time on CNC boring centers and multi-spindle machines compared to running two separate tools.
• The HW carbide head with precision-ground Z2 cutting edges and V2 spurs is specifically built for the high-cycle demands of panel processing, producing consistently clean results in chipboard, MDF, HDF, hardwood, softwood, plywood, and coated panels without frequent edge degradation.
• The PTFE-coated spiral flutes actively resist pitch and glue buildup - a common cause of bore quality loss and unplanned tool changes in production environments - keeping the tool performing at specification longer between maintenance stops.
• The 10x41mm shank with driving flat and length adjusting screw provides secure, repeatable mounting in compatible boring machine spindles, supporting accurate depth control across long production runs without operator re-adjustment.

Specifications

• Manufacturer Part Number: 377.080.12
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 12mm
• Total Length: 70mm
• Shank: 10x41mm
• Rotation: Left-Hand (LH)
• Number of Cutting Edges: 2 (Z2)
• Number of Spurs: 2 (V2)
• Blade Material: HW (Tungsten Carbide)
• Body Material: Super-Strength Steel
• Spiral Coating: P.T.F.E. (orange or black)

Approved Applications

• Dowel hole drilling and countersinking in one pass
• Bolt head and connector recessing in panel stock
• Panel processing on CNC boring centers and multi-spindle machines
• Boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels