CMT 310.080.22 Dowel Drill 5/16" x 27 x 57.5mm LH by CMT is a solid carbide boring bit engineered for left-hand rotation on high-speed multi-spindle machines and CNC boring centers. Built entirely from premium super-micrograin carbide sourced from Ceratizit, this 5/16" diameter dowel drill delivers exceptionally clean, flat-bottom blind holes in hardwood, particle board, MDF, and veneered panels - making it a reliable choice for furniture manufacturing, cabinet production, and panel processing applications where bore quality and tool longevity both matter.

Key Features

• Solid super-micrograin carbide construction (HWM material) - the entire bit is made from premium Ceratizit carbide, providing extreme wear resistance and allowing an almost infinite number of resharpenings, significantly lowering long-term tooling cost.
• 2 curved, negatively ground spurs (V2) - produce exceptionally clean bore walls with no rough edges or tearout, which is critical for veneered panels, coated boards, and fine furniture components where surface quality is non-negotiable.
• Center-point balanced tip design - the plunge edge runs all the way to the center of the bit, reducing drilling resistance and increasing production speed on high-output boring lines.
• Larger cylindrical head than traditional tips - provides extra resistance to prolonged use and contributes to a longer interval between sharpenings, reducing downtime on production runs.
• 2 cutting edges and 2 spiral flutes (Z2) - the twin-flute HWM spiral portion efficiently evacuates chips during drilling, helping maintain bore quality and preventing heat buildup during continuous operation.
• 10x27mm parallel shank with driving flat and adjustable screw length - compatible with standard boring machine chucks and spindle configurations, ensuring secure, repeatable tool holding on multi-spindle CNC units.
• Left-hand (LH) rotation - specifically designed for left-hand spindle positions on multi-spindle boring machines, ensuring correct geometry and cutting direction for those stations.
• Extreme sharpening rating - the solid carbide body can be resharpened to an extreme degree, making this bit a long-term investment compared to disposable alternatives.

Why This Product

• Furniture and cabinet shops that process large volumes of MDF, particle board, and hardwood panels benefit from the solid carbide construction, which outlasts standard steel bits and requires fewer tool changes during production shifts.
• The curved, negatively ground spurs address the common problem of tearout and rough bore edges on veneered or coated panels, delivering finished-quality holes that do not require secondary cleanup.
• The center-balanced plunge edge reduces the force needed to enter the material, which translates directly to faster feed rates on CNC boring centers and high-speed multi-spindle machines.
• Because the bit is a single solid carbide unit rather than a tipped design, it offers added structural integrity and can be resharpened repeatedly - making it well-suited for shops that maintain their own tooling and want to maximize cost-per-hole efficiency.

Specifications

• Manufacturer Part Number: 310.080.22
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 7/8"
• Total Length: 57.5mm
• Shank: 10x27mm
• Number of Teeth: 2
• Number of Spurs: 2
• Rotation: Left-hand (LH)
• Blade Material: HWM (solid super-micrograin carbide)
• Sharpening: Extreme

Approved Applications

• Blind hole drilling for dowel joinery connections
• Panel drilling and boring in furniture manufacturing
• Cabinet making and case goods production
• Hardwood and difficult composite boring
• Particle board and chipboard processing
• MDF and HDF panel drilling
• Veneered wood and coated panel boring
• High-speed multi-spindle boring machine operations
• CNC router and CNC boring center applications