CMT Dowel Drill with Countersink - 5/16" x 20 x 57mm, 10x20mm Shank, Right-Hand Rotation by CMT is a professional-grade boring tool engineered to drill and countersink in a single pass on CNC boring machines and multi-spindle boring centers. The integrated countersink creates a clean, precise recess for bolt heads and connectors, eliminating the need for a separate countersinking operation and improving throughput in panel processing workflows. Built on a super-strength steel body with a tungsten carbide (HW) cutting head and PTFE-coated spiral flutes, this dowel drill delivers consistent, accurate results in chipboard, MDF, hardwood, and coated panels alike.

Key Features

• Hardmetal (HW) cutting head with precision-balanced centre point - the carbide tip maintains accurate hole registration and prevents wandering at entry, producing clean, on-center bores in panel materials without pilot marks or tear-out at the surface.
• 2 precision-ground cutting edges (Z2) - dual cutting edges distribute the cutting load evenly, reducing heat buildup and extending edge life compared to single-edge designs, so you get more consistent hole quality over longer production runs.
• 2 ground spurs (V2) - the scored perimeter severs wood fibers cleanly before the main cutting edges engage, producing crisp bore walls with minimal fraying in laminates and coated panels where surface finish matters most.
• 2 spiral flutes with PTFE coating - the orange or black PTFE (polytetrafluoroethylene) coating on the spiral reduces friction and prevents pitch, resin, and adhesive buildup, meaning less frequent cleaning stops and longer continuous uptime on production lines.
• Integrated countersink combined with the drill body - drilling and countersinking happen in one machine pass, cutting cycle time and reducing tool change frequency on CNC boring centers and multi-spindle machines.
• Parallel shank with driving flat and length-adjusting screw (10x20mm) - the driving flat prevents shank rotation under load, while the length-adjusting screw allows precise depth setting in boring machine chucks, ensuring repeatable countersink depth across every workpiece.
• Super-strength steel body - the robust steel construction resists flex and vibration at high spindle speeds, maintaining dimensional accuracy over extended use in demanding production environments.
• Right-hand rotation (RH) - compatible with standard right-hand spindle boring machines and CNC boring centers without the need for special adapters or reverse-spindle configurations.

Why This Product

• The combined drill-and-countersink design solves the common production bottleneck of running two separate tool passes for connector recessing - one tool does both jobs, reducing cycle time and spindle changes on panel processing lines.
• The hardmetal (HW) cutting head paired with ground spurs makes this tool well suited for abrasive engineered wood products like chipboard, MDF, HDF, and laminates where standard HSS tools dull quickly and produce ragged bore edges.
• The PTFE-coated spiral reduces adhesive and pitch accumulation during glue-up or pre-laminated panel drilling operations, which directly translates to fewer cleaning interruptions and more consistent hole quality across a production shift.
• The parallel shank with driving flat and length-adjusting screw gives operators reliable, repeatable depth control in multi-spindle CNC boring centers - critical when drilling connector holes to a defined countersink depth across high volumes of cabinet panels.

Specifications

• Manufacturer Part Number: 376.082.11
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 20mm
• Total Length: 57.5mm
• Shank: 10x20mm
• Rotation: Right-Hand (RH)
• Number of Spurs: 2
• Number of Cutting Edges: 2
• Number of Flutes: 2
• Blade Material: HW (Hardmetal / Carbide-Tipped)

Approved Applications

• Drilling and countersinking in a single machine pass
• Bolt head and connector recessing in cabinet and furniture panels
• Panel processing on CNC boring centers and multi-spindle boring machines
• Through-hole and blind-hole boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels