The CMT 314.080.21 Dowel Drill for Through Holes is a premium solid carbide boring bit engineered for clean, precise through-hole drilling in furniture manufacturing, panel processing, and cabinetry production. Built from super-micrograin carbide and featuring a 5/16 in. diameter with right-hand rotation, this through-hole dowel drill delivers exceptional bore quality across a wide range of materials - from hardwood and softwood to MDF, chipboard, laminates, and coated panels. Designed for use on high-speed boring units and CNC routers, it combines industrial-grade construction with a precision-ground cutting geometry that keeps production moving and rework to a minimum.

Key Features

• Solid super-micrograin carbide body (HWM material) - provides extreme wear resistance and supports an almost infinite 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, keeping finished panels ready for assembly without additional cleanup.
• Centre point balanced tip design - ensures accurate hole placement and consistent bore geometry, reducing drift and improving repeatability across production runs.
• Plunge edge extending to the centre of the bit - reduces drilling resistance so the bit cuts faster and with less effort, increasing production speed and reducing load on the machine spindle.
• 2 precision-ground cutting edges (Z2) with 2 spiral flutes - deliver smooth, efficient chip evacuation and balanced cutting action for consistent results in demanding materials.
• Cylindrical head larger than traditional tips - offers superior resistance to prolonged use and extends the interval between sharpenings for less machine downtime.
• Premium quality high-strength steel shank (10 x 26 mm, parallel with driving flat) - provides a secure, stable connection in boring machine spindles and CNC tool holders, preventing slippage under load.
• Right-hand (RH) rotation - compatible with standard boring machine and CNC boring center spindle configurations used in panel processing.
• Extreme sharpening rating - the solid one-piece carbide construction allows the bit to be resharpened repeatedly to like-new performance, maximizing the return on each tool investment.

Why This Product

• Built for high-speed production environments - the solid carbide construction and plunge-to-centre cutting edge are specifically designed for excellent performance on multi-spindle CNC boring machines and high-speed boring units, where cycle time and bore quality directly affect output.
• Handles difficult composites without sacrificing bore quality - the negatively ground spurs and super-micrograin carbide are ideal for abrasive materials like particle board, MDF, and veneered wood where lesser bits chip or degrade quickly.
• Long service life between sharpenings - the cylindrical head is extremely resistant to prolonged use and the solid carbide unit supports repeated resharpenings, making this a durable, cost-effective choice for shops that run high volumes.
• Precise through-hole boring for dowel joinery - the 35 mm cutting height and 70 mm total length make this bit well-suited for through-hole dowel connections in panels, delivering the tight tolerances required for furniture assembly.

Specifications

• Manufacturer Part Number: 314.080.21
• Brand: CMT Orange Tools
• Diameter: 5/16 in.
• Cutting Height: 35 mm
• Total Length: 70 mm
• Shank: 10 x 26 mm
• Number of Cutting Edges: 2
• Body Material: HWM (super-micrograin carbide)
• Rotation: Right-hand (RH)
• Sharpening: Extreme
• Application Type: Through Hole

Approved Applications

• Drilling through holes for dowel connections in panel and furniture manufacturing
• Panel processing on multi-spindle CNC boring machines and boring centers
• High-speed boring on CNC routers
• Through-hole boring in hardwood and solid wood
• Boring in chipboard, particle board, and MDF
• Boring in veneered wood and coated panels
• Boring in laminates and HDF