CMT 311.064.22 Dowel Drill 1/4" x 30 x 70mm LH is a solid carbide left-hand rotation boring bit engineered for precise, clean-bottomed blind holes in furniture panels, cabinetry components, and engineered wood products. Built entirely from premium super-micrograin carbide, this long-series dowel drill delivers the cutting consistency and tool longevity that high-speed multi-spindle boring machines and CNC routers demand. With a 1/4" diameter, 30mm cutting height, and 70mm overall length, it is sized for deeper panel boring applications where standard-length bits fall short.

Key Features

• Solid super-micrograin carbide construction - the entire bit body is made from premium quality super-micrograin carbide, giving it exceptional wear resistance and allowing an almost infinite number of resharpenings, which lowers the long-term cost per bore compared to brazed-tip alternatives.
• Curved, negatively ground spurs (2 spurs) - produces exceptionally clear bores with no rough edges or tearout, resulting in cleaner hole walls and flat-bottom blind holes that require no secondary cleanup before inserting dowels.
• Centre-point balanced tip design - reduces drilling resistance and increases production speed, keeping the bit tracking true on entry and minimizing chatter on high-speed boring units and CNC equipment.
• Plunge edge extending to the centre of the bit - reduces drilling resistance from the moment of contact, allowing faster feed rates and higher throughput on production runs without sacrificing hole quality.
• Cylindrical head larger than traditional tips - provides extra resistance to prolonged use and extends the interval between resharpenings, supporting consistent performance across long production cycles.
• Left-hand (LH) rotation - designed to work with left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring the correct chip-ejection direction and clean bore geometry for that side of the machine.
• 10 x 30mm parallel shank with driving flat - locks securely into compatible boring machine chucks or adapters, preventing slippage under the high torque loads generated during continuous panel drilling.
• 2 flutes and 2 cutting edges (Z2) - balances chip evacuation efficiency with cutting stability, keeping the bore clear during the cut and reducing the risk of packing material that could deflect the bit.
• Extreme sharpening rating - the solid carbide construction supports repeated professional resharpening, extending usable tool life well beyond that of non-resharpenable alternatives and reducing replacement frequency in production environments.
• Compatible with hardwood and difficult composites including particle board, MDF, and veneered wood - versatility across demanding substrate types means a single bit can handle the full range of materials encountered in furniture and cabinet manufacturing.

Why This Product

• The 70mm overall length and 30mm cutting height make this bit specifically suited to deeper blind-hole boring in panels where a standard-length dowel drill cannot reach the required depth - a critical requirement in knock-down furniture and cabinet carcass assembly.
• Solid carbide construction with an extreme resharpening rating means the bit can be professionally resharpened an almost infinite number of times, giving production shops a lower total cost of ownership than single-use alternatives.
• The left-hand rotation configuration allows this bit to be used correctly on LH spindle positions of multi-spindle CNC boring centers and panel processing machines without retrofitting or adapters, matching the spindle direction that produces optimal chip ejection and bore quality on that side.
• Excellent performance on high-speed boring units and CNC routers is designed into the geometry - the centre-balanced tip, reduced-resistance plunge edge, and curved negatively ground spurs work together to maintain bore quality at production feed rates in MDF, particle board, hardwood, and veneered panels.

Specifications

• Manufacturer Part Number: 311.064.22
• Brand: CMT Orange Tools
• Diameter: 1/4"
• Cutting Height: 30mm
• Total Length: 70mm
• Shank: 10 x 30mm
• Rotation: Left-hand (LH)
• Number of Flutes: 2
• Number of Cutting Edges: 2
• Number of Spurs: 2
• Blade Material: HWM (solid carbide - super-micrograin)
• Sharpening: Extreme

Approved Applications

• Blind hole drilling for dowel connections in panel and solid wood assemblies
• Furniture manufacturing and knock-down furniture panel boring
• Cabinet making and carcass assembly
• Panel processing on multi-spindle CNC boring machines
• High-speed boring units and CNC boring centers
• Drilling in hardwood, particle board, MDF, HDF, plywood, veneered panels, and coated panels
• Left-hand spindle positions on multi-spindle boring machines