CMT Solid Carbide Dowel Drill - 4mm x 27mm x 70mm Left-Hand Rotation is a precision boring bit engineered for furniture manufacturing, cabinet making, and panel processing applications that demand clean, splinter-free blind holes. Built entirely from premium super-micrograin carbide, this left-hand rotation dowel drill delivers consistent performance in hardwood, MDF, particle board, chipboard, veneered panels, and difficult composite materials. The long-series 70mm overall length and 10x28mm parallel shank with driving flat make it a reliable choice for multi-spindle CNC boring machines, CNC boring centers, and panel processing centers where repeatability and hole quality are critical.

Key Features

• Solid super-micrograin carbide construction - the entire bit is made from a single unit of premium quality super-micrograin carbide sourced from Luxembourg, providing exceptional wear resistance and allowing an almost infinite number of resharpenings, which reduces long-term tooling cost.
• Curved, negatively ground spurs (2 spurs, V2) - the unique tip geometry produces exceptionally clean bore walls and flat-bottom holes with no rough edges or tearout, which is essential for dowel joinery in finished cabinet panels and veneered surfaces.
• Centre point balanced tip - ensures accurate entry and on-centre boring every time, minimizing wander and maintaining tight positional tolerances on high-speed boring units and CNC routers.
• Plunge edge running to the centre of the bit - reduces drilling resistance during plunge entry and increases production speed, meaning higher throughput on panel processing lines without sacrificing hole quality.
• Longer intervals between sharpenings - the extreme sharpening grade rating combined with solid carbide durability means less downtime for tool changes and resharpening, keeping production running longer.
• 2 cutting edges and 2 spiral flutes (Z2) - efficient chip evacuation keeps the bore clear during drilling, reducing heat buildup and contributing to cleaner holes in dense materials like MDF and particle board.
• Left-hand (LH) rotation - purpose-built for left-hand spindle positions on multi-spindle boring machines, ensuring correct cutting geometry and clean entry on the appropriate side of the workpiece.
• Cylindrical head larger than traditional tips - offers superior resistance to prolonged high-cycle use, making this bit well suited for industrial production environments where bits face continuous demand.
• Parallel shank with driving flat and adjustable screw length (10x28mm) - provides a secure, repeatable tool seat in boring machine chucks and adapters, reducing runout and preventing slippage under load.

Why This Product

• Furniture and cabinet manufacturers working with hardwood, MDF, particle board, and veneered panels need a boring bit that produces consistently clean blind holes - the curved, negatively ground spurs on this CMT solid carbide bit deliver splinter-free entry and exit in demanding composites where lesser bits cause tearout and rejection.
• High-volume panel processing operations benefit directly from the longer interval between sharpenings that solid super-micrograin carbide provides - fewer tool changes mean more uptime and lower per-part tooling cost over the life of the bit.
• The left-hand rotation design is specifically matched to LH spindle positions on multi-spindle CNC boring machines and boring centers - using a correctly handed bit eliminates the risk of cutting geometry reversal that produces poor hole quality and accelerated tool wear.
• Because this is a solid carbide unit rather than a tipped design, it supports an almost infinite number of resharpenings while maintaining the same cutting geometry - making it a long-term investment for shops that regularly service their tooling rather than discard it.

Specifications

• Manufacturer Part Number: 311.040.22
• Brand: CMT Orange Tools
• Diameter: 4mm
• Cutting Height: 30mm
• Total Length: 70mm
• Shank: 10x28mm
• Rotation: Left-Hand (LH)
• Number of Cutting Edges: 2
• Number of Spiral Flutes: 2
• Number of Spurs: 2
• Blade Material: HWM solid carbide
• Sharpening Grade: Extreme

Approved Applications

• Blind hole drilling for dowel connections and dowel joinery
• Panel drilling in furniture and cabinet manufacturing
• Boring in hardwood and solid wood components
• Boring in particle board and chipboard panels
• Boring in MDF and HDF sheet goods
• Boring in veneered and coated panels
• Boring in difficult composite materials
• Use on high-speed boring units and CNC boring centers
• Use on multi-spindle CNC routers and panel processing centers