CMT 310.070.42 Dowel Drill - 7 x 27 x 57.5mm Left-Hand Rotation is a solid carbide boring bit engineered for precise, clean blind-hole drilling in furniture manufacturing, cabinet making, and panel processing applications. Built entirely from premium super micrograin carbide, this left-hand dowel drill delivers exceptional bore clarity and long service life in demanding production environments - including high-speed multi-spindle boring machines and CNC routers. The 7mm diameter, 27mm cutting height, and 57.5mm overall length make it an ideal short-series bit for repetitive dowel-joint drilling in hardwood, MDF, particle board, and veneered composite panels.

Key Features

• Solid super micrograin carbide construction (HW material grade) - the entire bit body is machined from premium-quality carbide sourced from Luxembourg, allowing an almost infinite number of resharpenings and delivering extended tool life far beyond standard carbide-tipped alternatives.
• Curved, negatively ground spurs (2 spurs, V2) - this unique spur geometry scores the wood fiber cleanly around the bore perimeter before material is removed, producing exceptionally clean bore walls with no rough edges or tearout - critical for furniture-grade panel work.
• Centre-point balanced tip design - the balanced centre point ensures accurate hole placement and eliminates bit walk at entry, maintaining consistent positioning across high-volume CNC and multi-spindle boring runs.
• Plunge edge runs to the centre of the bit - reduces drilling resistance at entry, increasing production speed and reducing load on boring machine spindles during continuous operation.
• Larger-than-traditional cylindrical head - provides greater rigidity and resistance to deflection during prolonged use, maintaining bore diameter accuracy over extended production cycles.
• 2 cutting edges (Z2) with 2 spiral flutes - balanced chip evacuation keeps the bore clear during drilling, preventing chip packing that can cause heat buildup and bore quality degradation.
• 10 x 27mm parallel shank with driving flat - the driving flat locks the bit securely in the boring unit chuck or adapter, preventing rotation slip under load in high-speed production settings.
• Left-hand (LH) rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring correct cutting geometry and chip ejection direction.
• Rated for extreme sharpening frequency - the solid carbide body supports aggressive resharpening schedules without sacrificing structural integrity, reducing per-hole tooling cost over the life of the bit.
• Compatible with hardwood, MDF, particle board, and veneered wood - the micrograin carbide edge retention handles abrasive composite materials that rapidly dull conventional high-speed steel boring bits.

Why This Product

• Purpose-built for left-hand spindle positions - many multi-spindle boring machines require matched pairs of LH and RH bits for simultaneous drilling. This 7mm LH dowel drill fills that left-hand spindle role with correct cutting geometry, so paired hole sets align accurately for dowel joinery.
• Solid carbide - not just carbide-tipped - because the entire tool is solid micrograin carbide rather than a steel body with a brazed carbide tip, there is no joint to fail under heat or impact. This makes the bit safer and allows repeated resharpening down to the full usable length of the cutting zone.
• Designed for abrasive engineered panels - particle board, MDF, and veneered composites wear conventional tooling quickly. The super micrograin carbide grade holds a sharp edge significantly longer in these materials, reducing downtime for tool changes on high-volume cabinet and furniture production lines.
• Optimized for CNC routers and high-speed boring units - the centre-balanced tip, reduced drilling resistance from the centre-reaching plunge edge, and rigid oversized head all contribute to stable, chatter-free performance at the elevated spindle speeds typical of CNC boring centers and automated panel processing equipment.

Specifications

• Manufacturer Part Number: 310.070.42
• Brand: CMT Orange Tools
• Diameter: 7mm
• Cutting Height: 27mm
• Total Length: 57.5mm
• Shank: 10 x 27mm parallel shank with driving flat
• Number of Cutting Edges: 2 (Z2)
• Number of Spiral Flutes: 2
• Number of Spurs: 2 (V2)
• Rotation: Left-Hand (LH)
• Blade Material: HW - Solid Super Micrograin Carbide
• Sharpening Rating: Extreme
• Product Type: Dowel Drill

Approved Applications

• Blind hole drilling for dowel connections and dowel joinery
• Panel drilling on automated panel processing lines
• Furniture manufacturing - frame and carcass assembly
• Cabinet making and flat-pack furniture production
• Drilling in hardwood and difficult composites including particle board, MDF, and veneered wood
• High-speed boring unit and CNC router applications
• Multi-spindle CNC boring machine left-hand spindle positions