CMT Dowel Drill for Through Holes - 5 x 30 x 70mm Left-Hand Rotation is a solid carbide boring bit engineered for precision through-hole drilling in panel processing and furniture manufacturing applications. Built entirely from premium super-micrograin carbide, this left-hand (LH) rotation drill produces exceptionally clean bores in hardwood, chipboard, MDF, HDF, veneered wood, and other difficult composites - making it a reliable choice for high-speed boring units and CNC routers alike. With a 5mm cutting diameter, 35mm cutting height, and 70mm total length, it is purpose-built for panels up to 30mm thick where blowout-free exit holes and long tool life are critical.

Key Features

• Solid super-micrograin carbide construction (HW material grade) - the entire bit is formed from a single unit of premium carbide sourced from Luxembourg, meaning there is no carbide-to-steel bond to fail under repeated heavy use. This also allows an almost infinite number of resharpenings, dramatically extending the usable life of the tool and reducing long-term tooling cost.
• Curved, negatively ground spurs at the tip - this unique tip geometry severs wood fibers cleanly before the main cutting action begins, producing exceptionally clear bore walls with no rough edges or tearout - critical when drilling veneered panels or coated surfaces where surface quality matters.
• Centre-balanced point - the precision-balanced centre point keeps the drill tracking true from the moment it contacts the workpiece, reducing wandering and improving hole-to-hole positional accuracy on multi-spindle and CNC boring equipment.
• Plunge edge running all the way to the centre of the bit - this design reduces drilling resistance and increases production speed, letting the bit plunge faster without bogging down the machine - a direct throughput advantage on high-production boring lines.
• 2 precision-ground cutting edges (Z2) with 2 spiral flutes - dual cutting edges share the load evenly, producing a balanced cut that minimizes vibration and keeps bore geometry consistent across long production runs.
• Left-hand (LH) rotation - correctly matched to LH boring machine spindles and CNC configurations where left-hand drills are required, ensuring proper chip evacuation direction and eliminating the risk of tool pull-out from the spindle during operation.
• 10 x 26mm parallel shank with driving flat - the precision parallel shank with driving flat seats securely in standard boring machine chucks and CNC tool holders, preventing slippage under load and enabling quick, repeatable tool changes.
• Extreme sharpening rating - this bit is rated for extreme resharpenings, meaning each edge can be reconditioned to factory-level performance repeatedly, keeping cost-per-hole low over the lifetime of the tool.
• Compatible with hardwood and difficult composites including particle board, MDF, and veneered wood - the carbide grade and tip geometry are specifically optimized for these demanding materials, where lesser tooling produces fraying, delamination, or premature wear.

Why This Product

• Engineered for blowout-free through holes in panel materials - the long-series 70mm length and 35mm cutting height allow clean entry and exit in panels up to 30mm thick, with the curved negative spurs preventing the fiber tearout that commonly ruins veneered or laminated surfaces at the exit side of a through hole.
• Solid carbide delivers measurably longer life between sharpenings than carbide-tipped alternatives - because the entire bit is one homogeneous piece of super-micrograin carbide, it retains edge sharpness far longer in abrasive materials like MDF and particle board, reducing machine downtime for tool changes on high-volume production lines.
• Purpose-built for high-speed boring units and CNC routers - the balanced centre point, reduced drilling resistance design, and precision parallel shank combine to make this bit stable and accurate at the elevated spindle speeds common in industrial CNC boring centers and multi-spindle panel processors.
• Left-hand rotation (LH) availability fills a specific machine requirement - many multi-spindle boring machines use opposing-rotation spindle pairs, and having the correctly handed drill eliminates the compromise of using a wrong-rotation bit, which can cause poor chip evacuation, increased heat, and degraded hole quality.

Specifications

• Manufacturer Part Number: 314.050.42
• Brand: CMT Orange Tools
• Diameter: 5mm
• Cutting Height: 35mm
• Total Length: 70mm
• Shank: 10 x 26mm
• Rotation: Left-Hand (LH)
• Number of Teeth: 2
• Material: HW (Solid Carbide)
• Sharpening Rating: Extreme

Approved Applications

• Through-hole drilling for dowel connections in panel furniture assembly
• Panel processing on multi-spindle CNC boring machines and boring centers
• Through-hole boring in hardwood, particle board, MDF, HDF, plywood, and veneered wood
• High-speed boring unit operations requiring left-hand rotation tooling
• CNC router through-hole drilling in difficult composites and coated panels
• Furniture manufacturing production lines requiring clean, blowout-free bores