Product Description
CMT 311.130.12 Dowel Drill - 13 x 35 x 70mm Left-Hand Rotation is a precision-engineered, 2-flute carbide-tipped boring bit designed for clean, accurate blind-hole drilling in furniture panels and cabinet components. Built by CMT on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand (LH) dowel drill is sized for multi-spindle boring machines and CNC boring centers where consistent dowel joint quality is essential. The 13mm cutting diameter, 35mm cutting height, and 70mm overall length make it well suited to deeper panel boring applications where a standard-length bit would fall short.
Key Features
- 2-Flute Carbide (HW) Cutting Head - 2 precision-ground HW cutting edges hold a sharp edge longer than high-speed steel alone, reducing tool changes and maintaining consistent hole quality across high-volume panel runs.
- 2 Negatively Ground Spurs - the negatively ground spur geometry scores the panel surface cleanly before the main cutting edges engage, producing flat-bottom blind holes with no tearout or fraying - critical for dowel joints in chipboard, MDF, and coated panels.
- PTFE-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral portion prevents pitch, resin, and glue buildup, keeping chips clearing freely and reducing heat buildup during continuous production boring.
- Precision-Balanced Centre Point - the HW centre point self-locates on the panel surface, preventing the bit from walking at the start of the cut and ensuring accurate hole placement for tight-tolerance dowel assembly.
- Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 30mm parallel shank seats securely in multi-spindle boring heads; the driving flat prevents rotation slippage, and the length-adjusting screw allows fine depth calibration without removing and repositioning the bit.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, ensuring proper chip ejection direction and correct cutting geometry when used in its intended spindle orientation.
- Super-Strength Steel Body - the steel shank and spiral body resist flex and vibration during high-cycle boring, contributing to hole roundness and dimensional accuracy across large panel batches.
Why This Product
- The 70mm overall length and 35mm cutting height address deeper blind-hole requirements that shorter dowel drills cannot reach - making this the appropriate choice when panel thickness or dowel depth demands extra clearance.
- The left-hand rotation designation matches specific spindle positions on multi-spindle CNC boring machines and panel processing centers, so drilling geometry and chip ejection work correctly without improvising with a right-hand bit.
- The combination of a negatively ground spur geometry and PTFE-coated flutes directly targets the two most common boring problems in furniture production - edge tearout and chip packing - handling both in a single tool without add-on steps.
- The parallel shank with driving flat and length-adjusting screw allows fast, repeatable setup in production boring heads, reducing setup time between jobs and supporting consistent hole depth across every panel in a run.
Specifications
- Manufacturer Part Number: 311.130.12
- Brand: CMT Orange Tools
- Diameter: 13mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 30mm parallel shank with driving flat
- Rotation: Left-Hand (LH)
- Number of Flutes: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Cutting Edge Material: HW (tungsten carbide)
- Body Material: Super-strength steel
- Coating: P.T.F.E. on spiral portion
Approved Applications
- Blind hole drilling for dowel connections in panel assemblies
- Furniture manufacturing and cabinet making
- Panel drilling in chipboard, MDF, HDF, and coated panels
- Solid hardwood and softwood boring
- Plastics and laminates
- Multi-spindle CNC boring machines and boring centers
- Panel processing centers
- Boring machines fitted with a compatible adapter or chuck
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 cut when spinning counter-clockwise as viewed from the shank end. Multi-spindle boring machines assign specific spindle positions as left-hand or right-hand. Using an LH bit in the correct LH spindle position ensures the cutting edges engage the material in the proper direction and chips eject cleanly. Check your machine's spindle designation chart before selecting LH or RH bits.
What is the shank size and how does this bit mount in a boring head?
This dowel drill uses a 10 x 30mm parallel shank with a driving flat. The driving flat prevents the bit from spinning in the chuck under load, and a length-adjusting screw on the shank allows you to set and fine-tune boring depth directly at the spindle without repositioning the bit manually.
Why does this dowel drill have negatively ground spurs, and what benefit does that provide?
The 2 negatively ground spurs score a clean circle on the panel face before the main cutting edges remove material. This shearing action prevents the wood fibers or laminate surface from tearing outward as the bit enters, producing a clean, defined hole edge - especially important when boring coated panels, chipboard, or laminates where surface tearout would compromise the finished joint appearance.
What is the purpose of the P.T.F.E. coating on the spiral portion of this bit?
The P.T.F.E. (polytetrafluoroethylene) coating on the spiral flutes creates a low-friction surface that resists adhesion of pitch, resin, sawdust, and glue. This keeps chips moving freely up and out of the hole rather than packing inside the flutes, which reduces heat buildup, maintains cutting efficiency, and extends the service life of the bit during continuous production boring operations.
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