CMT 311.080.21 Dowel Drill 5/16" x 35 x 70mm RH is a solid carbide boring bit engineered for high-precision blind hole drilling in furniture manufacturing, cabinet making, and panel processing applications. Built entirely from premium super-micrograin carbide, this right-hand rotation dowel drill delivers consistently clean bores in hardwood, chipboard, MDF, HDF, plywood, laminates, and coated panels - making it a reliable choice for production shops running multi-spindle CNC boring machines, CNC boring centers, and panel processing centers. With a 5/16" cutting diameter, 35mm cutting height, and 70mm overall length, it is purpose-built for dowel connection drilling and deep blind-hole boring where precision and repeatability matter most.

Key Features

• Solid super-micrograin carbide construction - the entire bit is made from premium carbide sourced from Luxembourg, providing exceptional wear resistance and allowing an almost infinite number of resharpenings so the bit delivers long-term value in high-production environments.
• 2 curved, negatively ground spurs (V2) - the unique tip geometry produces exceptionally clean bore walls and flat-bottom holes with no rough edges or tearout, which is critical when drilling veneered panels or finish-grade cabinet components.
• Centre-balanced point - the balanced centre point reduces walking and positional drift during entry, resulting in accurately located holes and consistent dowel alignment across repeated operations.
• Plunge edge runs to the centre of the bit - this design reduces drilling resistance and increases production speed, letting operators run faster feed rates without compromising hole quality.
• 2 flute, 2 cutting edge design (Z2) - dual flutes clear chips efficiently during deep blind-hole boring, reducing heat buildup and extending the interval between sharpenings.
• Parallel shank with driving flat (10x25mm) - the driving flat engages positively in boring machine chucks and adapter collets, preventing slippage under load and ensuring repeatable tool positioning.
• Extreme sharpening rating - the solid carbide body can withstand repeated resharpening cycles, making this bit a cost-effective long-term tool for shops that maintain their own tooling.
• Right-hand rotation (RH) - compatible with standard right-hand boring spindles found on the vast majority of CNC boring centers and multi-spindle panel processing machines.

Why This Product

• Shops drilling dowel holes in difficult composites like particle board, MDF, and veneered wood benefit from the negatively ground spurs, which eliminate tearout at the bore entry - a common problem with conventional twist drills used in panel work.
• The solid carbide construction rather than carbide-tipped design means there is no brazed joint to fail under the heat and vibration of high-speed CNC boring units, making this bit a more reliable option for continuous production runs.
• The 70mm overall length and 35mm cutting height make this bit suited to long-series boring applications where standard short-series bits cannot reach adequate depth for proper dowel seating in thick panels.
• The extreme resharpening capability of the solid carbide body means the bit can be maintained in-house over many cycles rather than replaced frequently, reducing tooling cost per bore over the life of the bit.

Specifications

• Manufacturer Part Number: 311.080.21
• Brand: CMT Orange Tools
• Diameter: 5/16"
• Cutting Height: 35mm
• Total Length: 70mm
• Shank: 10x25mm
• Rotation: Right-hand (RH)
• Number of Spurs: 2
• Number of Cutting Edges: 2 (Z2)
• Blade Material: HWM solid carbide
• Sharpening: Extreme

Approved Applications

• Blind hole drilling for dowel connections
• Panel drilling in furniture manufacturing
• Cabinet making and case goods production
• CNC boring center operations
• Multi-spindle panel boring machine use
• High-speed boring unit applications