Product Description
CMT Dowel Drill 9 x 27 x 57.5mm Left-Hand Rotation is a solid carbide boring bit engineered for precise, clean blind-hole drilling in demanding production environments. Built entirely from premium super micrograin carbide, this left-hand rotation dowel drill delivers exceptional bore quality in hardwood, particle board, MDF, veneered wood, and difficult composite panels - making it a reliable choice for furniture manufacturing, cabinet making, and CNC boring center operations where consistent, splinter-free results are essential.
Key Features
- Solid Super Micrograin Carbide Construction (HW) - the entire bit is made from premium-grade carbide rather than a carbide-tipped steel body, providing superior wear resistance, an almost infinite number of resharpenings, and extra safety due to its unified solid construction.
- 2 Curved, Negatively Ground Spurs (V2) - the unique spur geometry scores the material cleanly before the cutting edges engage, producing exceptionally clean bore walls with no rough edges or tearout on even sensitive veneered and coated panels.
- Center-Balanced Tip with Full-Center Plunge Edge - the plunge edge runs all the way to the center of the bit, reducing drilling resistance, increasing production speed, and helping maintain a balanced entry for consistent hole quality.
- Enlarged Cylindrical Head - larger than traditional designs, the cylindrical head offers greater resistance to prolonged use and heavy production cycles, reducing downtime between tool changes.
- 2 Cutting Edges and 2 Spiral Flutes (Z2) - the dual-flute configuration promotes efficient chip evacuation during blind-hole drilling, keeping the cut clean and reducing heat buildup in the bore.
- Left-Hand Rotation (LH) - designed specifically for left-hand spindles found on multi-spindle CNC boring machines and panel processing centers, ensuring correct engagement and clean results without modification.
- 10 x 27mm Parallel Shank with Driving Flat - the parallel shank with driving flat provides a secure, non-slip seat in machine chucks and boring unit collets, maintaining positional accuracy throughout the drilling cycle.
- Extreme Sharpening Grade - rated for extreme resharpening, this bit holds its edge longer between services than standard tooling, lowering the cost per hole over the life of the tool.
- PTFE-Coated Spiral Portion - the orange or black PTFE coating on the spiral prevents pitch, resin, and adhesive buildup, keeping the flutes clear and maintaining consistent chip flow without interruption.
Why This Product
- For shops running left-hand spindle boring machines or CNC routers, this bit is purpose-built with left-hand rotation - there is no need for adapters or workarounds to get correct tool engagement on the correct spindle side.
- The fully solid carbide body means the bit can be resharpened an almost unlimited number of times, making it a long-term investment compared to carbide-tipped tooling where the tip bond is the limiting factor.
- The negatively ground curved spurs and center-balanced tip work together to produce clean, flat-bottomed blind holes with no tearout - critical for dowel connections in visible furniture faces and veneered panels where surface quality cannot be compromised.
- With a 27mm cutting height and 9mm diameter matched to a 10 x 27mm shank, this bit is sized for short-series high-speed boring unit applications where rigidity and minimal runout directly affect output quality on MDF, particle board, hardwood, and laminated composites.
Specifications
- Manufacturer Part Number: 310.090.42
- Brand: CMT Orange Tools
- Diameter: 9mm
- Cutting Height: 27mm
- Total Length: 57.5mm
- Shank: 10 x 27mm (parallel shank with driving flat)
- Rotation: Left-Hand (LH)
- Number of Spurs: 2
- Number of Cutting Edges: 2
- Blade Material: HW (Solid Super Micrograin Carbide)
- Sharpening Grade: Extreme
Approved Applications
- Blind-hole dowel connection drilling in furniture manufacturing
- Panel drilling on multi-spindle CNC boring machines
- Cabinet making and case goods production
- High-speed boring unit operations
- CNC router boring cycles
- Drilling in hardwood, MDF, particle board, veneered wood, and difficult composite panels
Frequently Asked Questions
What does left-hand (LH) rotation mean and how do I know if this bit is right for my machine?
Left-hand rotation means the bit is designed to spin counter-clockwise when viewed from the shank end. Multi-spindle CNC boring machines and panel processing centers often have dedicated left-hand spindles positioned to the left side of the boring head. If your machine spindle turns counter-clockwise, this LH bit will engage correctly and produce clean cuts. Using a right-hand bit on a left-hand spindle - or vice versa - will cause the bit to back out rather than drill in.
Can this solid carbide dowel drill be resharpened, and how often?
Yes. Because the bit is made entirely from solid super micrograin carbide rather than a carbide-tipped body with a brazed tip, it can be resharpened an almost unlimited number of times. The solid construction also means there is no bond between tip and shank to fail during resharpening. It is rated at an extreme sharpening grade, indicating it holds its edge well and extends the interval between services.
What materials is this dowel drill suitable for?
This bit is designed for hardwood and difficult composites including particle board, MDF, and veneered wood. The negatively ground curved spurs and center-balanced tip geometry make it particularly effective on materials where clean bore entry and exit are required - such as veneered or coated panels where tearout would be visible in the finished piece.
What is the purpose of the PTFE coating on the spiral portion of the bit?
The PTFE coating on the spiral flute area prevents pitch, resin, and adhesive residue from building up on the bit during drilling. This buildup can cause the flutes to clog, increasing friction, reducing chip evacuation efficiency, and degrading cut quality. By resisting these deposits, the PTFE-coated spiral keeps the bit performing consistently during extended production runs without frequent cleaning interruptions.
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