CMT 314.040.22 Solid Carbide Dowel Drill for Through Holes is a left-hand rotation boring bit engineered for high-speed multi-spindle machines and CNC routers where clean, precise through-hole drilling is required. Built entirely from premium super-micrograin carbide sourced from Luxembourg, this 4mm (5/32") diameter drill delivers exceptional bore quality in hardwood, particle board, MDF, veneered panels, and coated composites - applications where ordinary bits leave rough edges or tearout. At 70mm total length with a 35mm cutting height, it is sized for panels requiring full penetration, making it a reliable choice for furniture manufacturing and panel processing operations that demand consistent, production-speed results.

Key Features

• Solid super-micrograin carbide construction (HWM body) - provides extreme wear resistance across abrasive materials like MDF and particle board, and supports an almost unlimited number of resharpenings, reducing long-term tooling cost.
• Curved, negatively ground spurs at the tip - produce exceptionally clean bore walls with no rough edges or tearout on entry or exit, which is critical when drilling veneered or coated panels where surface quality matters.
• Centre-balanced point geometry - keeps the drill tracking true on entry, reducing deflection and improving hole-position accuracy on CNC boring centers and multi-spindle machines.
• Plunge edge running to the center of the bit - reduces drilling resistance and increases production speed, allowing faster cycle times on high-throughput boring operations.
• 2 precision-ground cutting edges (Z2) with 2 spiral flutes - double-angle geometry clears chips efficiently, maintains cutting performance over extended runs, and supports the left-hand rotation required by dedicated LH spindles.
• Left-hand (LH) rotation - matches standard LH spindle boring machines and CNC boring centers directly, requiring no adapter modification and ensuring correct cutting geometry for clean results.
• 10x26mm parallel shank with driving flat and adjustable screw length - provides a positive, secure grip in standard boring machine collets and reduces slippage under load.
• Extreme sharpening rating - the solid carbide unit can be resharpened repeatedly without loss of structural integrity, extending the usable life of each bit well beyond that of tipped or steel alternatives.

Why This Product

• Solid carbide construction throughout the body - not just at the tip - means this drill withstands the aggressive feed rates of CNC boring centers and multi-spindle machines without premature wear, delivering consistent hole quality over long production runs in demanding materials.
• The negatively ground curved spur design directly addresses the most common problem in through-hole panel drilling: blowout and torn edges on exit, making this bit the right choice when working with veneered wood, laminates, and coated panels where surface damage is unacceptable.
• Left-hand rotation is built into the tool geometry - not a modification - so this bit integrates directly with LH spindle boring equipment without additional setup, saving time and reducing the chance of mismatched tooling errors.
• At 4mm (5/32") diameter and 70mm overall length with a 35mm cutting height, this drill is specifically proportioned for through-hole dowel connections in standard furniture panels, providing the dimensional accuracy that flat-pack and case goods manufacturers require for reliable assembly.

Specifications

• Manufacturer Part Number: 314.040.22
• Brand: CMT Orange Tools
• Diameter: 4mm (5/32")
• Cutting Height: 35mm
• Total Length: 70mm
• Shank: 10x26mm (parallel shank with driving flat)
• Number of Cutting Edges: 2 (Z2)
• Number of Flutes: 2 spiral flutes
• Rotation: Left-hand (LH)
• Body Material: HWM (high wear-resistance super-micrograin carbide)
• Sharpening Rating: Extreme
• Drill Type: Through-hole dowel drill

Approved Applications

• Through-hole dowel connection drilling in furniture panels
• Panel processing on multi-spindle CNC boring machines and CNC boring centers
• High-speed boring on dedicated panel processing centers
• Drilling through solid hardwood, softwood, chipboard, particle board, MDF, HDF, plywood, veneered wood, laminates, and coated panels
• Case goods and flat-pack furniture manufacturing requiring precise, repeatable hole placement