Product Description
CMT 311.050.21 Dowel Drill - 5 x 30 x 70mm Right-Hand is a solid carbide boring bit engineered for precision dowel hole drilling in furniture manufacturing, cabinet making, and panel processing applications. Built entirely from premium super-micrograin carbide sourced from Luxembourg, this 5mm dowel drill delivers clean, flat-bottomed bores in hardwood, MDF, particle board, plywood, and veneered composites - making it a reliable choice for high-volume production environments and CNC boring operations alike. The right-hand (RH) rotation design, 2 cutting edges, and curved negatively ground spurs combine to minimize tearout and maximize bore quality on every pass.
Key Features
- Solid super-micrograin carbide construction (HWM) - the entire bit is made from a single unit of premium carbide, providing exceptional wear resistance, extra safety during high-speed operation, and the ability to withstand an almost infinite number of resharpenings without sacrificing performance.
- 2 curved, negatively ground spurs (V2) - the unique spur geometry scores the wood fibers ahead of the cutting edges, producing exceptionally clean bore walls and flat-bottomed holes with no rough edges or tearout - critical for visible dowel joints in furniture and cabinet panels.
- Centre-balanced tip design - the balanced centre point keeps the bit running true on entry, reducing wander and ensuring accurate hole placement across multi-spindle CNC boring machines and panel processing centers.
- Plunge edge extending to the bit centre - reduces drilling resistance so each bore requires less force and less cycle time, increasing production speed and reducing wear on the machine spindle.
- Oversized cylindrical head - larger than traditional dowel bit tips, this geometry is extremely resistant to prolonged use, extending service intervals and keeping the bit productive longer between sharpenings.
- 2 spiral flutes (Z2) - efficiently evacuate chips from the bore during drilling, preventing clogging and heat buildup when boring into dense materials such as hardwood and particle board.
- 10 x 28mm parallel shank with driving flat - the shank profile locks securely into boring machine chucks and CNC spindle holders, preventing slippage under load and ensuring repeatable, precise depth control.
- Extreme sharpening rating - the carbide grade and tip geometry are optimized to hold a sharp edge longer than standard HSS alternatives, reducing downtime for tool changes in high-output production settings.
- Right-hand (RH) rotation - compatible with the standard spindle direction of most industrial multi-spindle boring machines, CNC boring centers, and panel processing equipment.
Why This Product
- For woodworkers and production shops that cannot tolerate tearout or ragged bore edges on finished panels, the negatively ground curved spurs and balanced centre point work together to deliver clean, precise holes in hardwood, MDF, HDF, veneered wood, and coated panels - materials where bore quality directly affects joint strength and surface appearance.
- The all-carbide construction means this bit can be resharpened far more times than a comparable high-speed steel dowel drill, lowering the long-term cost per hole in high-volume furniture and cabinet manufacturing environments where bits cycle through heavy use daily.
- With a 5mm cutting diameter, 30mm cutting height, and 70mm total length, this bit fills the long-series dowel drilling requirement for panels that need deeper bores - a specification not covered by standard-length 5mm dowel bits.
- Designed for excellent performance on high-speed boring units and CNC routers, this bit integrates directly into automated panel processing workflows without modification, making it a practical upgrade for shops running large production volumes on industrial boring equipment.
Specifications
- Manufacturer Part Number: 311.050.21
- Brand: CMT Orange Tools
- Diameter: 5mm
- Cutting Height: 30mm
- Total Length: 70mm
- Shank: 10 x 28mm
- Rotation: Right-Hand (RH)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Blade Material: HWM Solid Carbide
- Sharpening: Extreme
Approved Applications
- Blind hole drilling for dowel joinery connections
- Panel drilling in furniture manufacturing
- Cabinet making and case construction
- Boring in hardwood, softwood, plywood, and laminates
- Drilling in particle board, MDF, HDF, and veneered wood
- High-speed multi-spindle CNC boring machine operations
- CNC router and boring center panel processing
- Coated and pre-finished panel boring
Frequently Asked Questions
What materials is this dowel drill designed to bore into?
This bit is designed for hardwood, softwood, particle board, MDF, HDF, plywood, veneered wood, laminates, and coated panels. The solid super-micrograin carbide construction makes it particularly well suited to difficult composites such as particle board and MDF that wear standard HSS bits quickly.
What machines is the CMT 311.050.21 compatible with?
This bit is designed for use on high-speed multi-spindle boring machines, CNC boring centers, and panel processing centers. The 10 x 28mm parallel shank with driving flat is the standard interface for industrial boring equipment spindles. It can also be used on boring machines equipped with an appropriate adapter or chuck.
Can this bit be resharpened, and how many times?
Yes. Because the bit is a solid unit of carbide - not carbide-tipped - it can be resharpened an almost infinite number of times according to CMT. The solid carbide construction also provides extra safety compared to tipped designs. The sharpening rating for this bit is listed as Extreme, indicating the geometry is well suited to repeated regrinding.
What is the difference between this long-series 70mm bit and a standard-length dowel drill?
This bit has a total length of 70mm and a cutting height of 30mm, which falls into the long-series category for 5mm dowel drills. The extended length and deeper cutting height allow it to produce bores that standard-length bits cannot reach - useful when panel thickness or joint design requires a deeper blind hole for the dowel connection.
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