CMT Dowel Drill Xtreme - 4mm Diameter, 10x28mm Shank, RH Rotation (311.040.21) is a solid carbide boring bit engineered for precision dowel hole drilling in furniture manufacturing, cabinet making, and panel processing applications. Built entirely from premium super-micrograin carbide, this 4mm diameter dowel drill delivers exceptionally clean bores in hardwood, MDF, particle board, plywood, and veneered composites, making it a go-to choice for high-speed boring units and CNC routers where consistency and tool longevity are critical.

Key Features

• Solid carbide (HWM) construction - the entire bit is made from premium super-micrograin carbide, providing exceptional wear resistance and supporting an almost infinite number of resharpenings, reducing long-term tooling costs significantly.
• Xtreme sharpening grade - the advanced grind profile maintains cutting edge integrity longer between sharpenings, increasing production uptime and reducing tool change frequency on busy boring lines.
• 2 curved, negatively ground spurs (V2) - the unique spur geometry produces exceptionally clean bore walls and flat-bottom holes with no rough edges or tearout, even in veneered panels and coated surfaces.
• Centre-balanced tip with plunge edge extending to centre - reduces drilling resistance and increases production speed, which is especially valuable in multi-spindle CNC boring operations running high cycle counts.
• 2 cutting edges and 2 spiral flutes (Z2) - efficient chip evacuation and balanced cutting forces result in smoother bore finishes and reduced heat buildup during extended runs.
• 10x28mm parallel shank with driving flat and adjustable screw length - provides a secure, repeatable grip in standard boring machine chucks and CNC tool holders, preventing slippage under load.
• 70mm total length with 27mm cutting height - the long-series format enables deeper blind hole drilling for panel applications requiring greater boring depth than standard-length bits allow.
• Right-hand (RH) rotation - compatible with the vast majority of CNC boring centers and multi-spindle boring machines configured for standard right-hand tooling.

Why This Product

• When dowel connections in furniture panels demand a clean, splinter-free bore, the negatively ground curved spurs on this bit cut cleanly through veneered wood, MDF, and coated panels without causing surface tearout - protecting the finished face of the workpiece.
• For shops running high-volume CNC or multi-spindle boring operations, the solid carbide body and Xtreme sharpening grade mean fewer tool changes and more consistent hole quality across long production runs.
• The solid carbide construction makes this bit resharpenable almost indefinitely, offering a compelling cost-per-bore advantage over disposable alternatives in demanding industrial environments.
• With a 4mm diameter and 70mm total length, this bit is specifically sized for the blind dowel holes used in flat-pack and RTA furniture construction, fitting the bore dimensions required for standard 4mm dowel joinery.

Specifications

• Manufacturer Part Number: 311.040.21
• Brand: CMT Orange Tools
• Diameter: 4mm
• Cutting Height: 27mm
• Total Length: 70mm
• Shank: 10x28mm
• Rotation: RH (Right-Hand)
• Number of Teeth: 2
• Number of Spurs: 2
• Material: HWM (Solid Carbide - Super Micrograin)
• Sharpening Grade: Extreme

Approved Applications

• Blind hole drilling for dowel connections in panel furniture
• Cabinet making and flat-pack furniture production
• Panel drilling in particle board, MDF, HDF, and veneered wood
• Hardwood and composite boring on high-speed boring units
• CNC router and CNC boring center tooling
• Multi-spindle boring machine applications