Product Description
CMT 309.150.12 Dowel Drill - 15 x 43 x 70mm Left-Hand Rotation by CMT is a precision-engineered carbide-tipped boring tool designed for dowel hole drilling in furniture manufacturing, cabinet making, and panel processing applications. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotating drill produces clean, flat-bottom blind holes in chipboard, MDF, hardwood, softwood, plywood, and coated panels. The 70mm overall length accommodates deeper blind holes in thicker panel stock, while the 43mm cutting height delivers the reach needed for demanding multi-spindle and CNC boring operations.
Key Features
- HW (Tungsten Carbide) Cutting Head on Super-Strength Steel Body - the carbide tip maintains a sharp cutting edge far longer than standard high-speed steel, reducing replacement frequency and downtime in production environments.
- 2 Precision-Ground HW Cutting Edges (Z2) - dual carbide cutting edges work together to shear material cleanly, producing smooth bore walls and accurate hole diameters critical for tight dowel fits.
- 2 Negatively Ground Spurs (V2) - negatively set spurs score the material perimeter before the cutting edges engage, preventing tearout and delivering a clean entry hole in laminates, coated panels, and veneered surfaces.
- 4 Spiral Flutes - four flutes evacuate chips rapidly during drilling, preventing heat buildup and reducing the risk of burning or glazing in MDF and chipboard.
- PTFE Coating on Cutter Portion (Black or Orange) - the low-friction PTFE coating resists pitch and adhesive buildup, keeping the flutes clear and maintaining consistent cutting performance over extended use.
- Precision-Balanced Centre Point - the HW centre point registers accurately at the drill entry location, ensuring hole placement precision that is essential in CNC and multi-spindle boring centres where pattern accuracy is critical.
- Parallel Shank with Driving Flat and Length Adjusting Screw (10 x 20mm) - the flat on the shank prevents rotation in the chuck, and the adjusting screw allows precise depth setting, giving operators consistent hole depth across an entire production run.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines and CNC boring centres, making it a direct-fit solution for machines requiring LH tooling.
- 70mm Overall Length - Long Series - the extended body length accommodates thicker panels and deeper blind-hole requirements without the need for extension adapters.
Why This Product
- The left-hand rotation designation makes this drill a purpose-built solution for LH spindle positions on multi-spindle boring machines and CNC panel processing centres - no workarounds or adapters required to match spindle direction.
- The combination of negatively ground spurs and a carbide cutting head means both the perimeter score and the main bore cut are handled cleanly in one pass, reducing edge chipping in laminates and coated panels where surface quality directly affects finished product appearance.
- Four spiral flutes paired with a PTFE-coated cutter body address two of the most common problems in high-volume panel boring - chip packing and resin buildup - keeping the tool cutting freely across long production runs.
- At 70mm overall length with a 43mm cutting height, this drill handles deeper blind holes in thicker panel stock without switching to a different tool series, streamlining tool management in furniture and cabinet manufacturing workflows.
Specifications
- Manufacturer Part Number: 309.150.12
- Brand: CMT Orange Tools
- Diameter: 15mm
- Cutting Height: 43mm
- Total Length: 70mm
- Shank: 10 x 20mm
- Rotation: LH (Left-Hand)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Number of Flutes: 4
- Sharpening: Negatively ground spurs
- Material: HW (Tungsten Carbide)
- Cutter Coating: PTFE (black or orange)
- Shank Type: Parallel shank with driving flat and length adjusting screw
Approved Applications
- Drilling blind holes for dowel connections in panel furniture assembly
- Panel drilling on multi-spindle CNC boring machines
- Cabinet making and furniture manufacturing production lines
- Boring operations in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
- Left-hand spindle positions on CNC boring centres and panel processing centres
Frequently Asked Questions
What does left-hand (LH) rotation mean, and how do I know if this drill is right for my machine?
Left-hand rotation means the drill bit rotates counter-clockwise when viewed from the shank end. Multi-spindle boring machines and CNC boring centres use both right-hand and left-hand spindles depending on their position in the head. You should confirm your machine's spindle rotation direction before selecting a dowel drill - using an LH bit in an RH spindle (or vice versa) will cause the bit to loosen rather than tighten during operation. Consult your machine manual or spindle specifications to verify.
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs (V2) on this drill pre-score the material surface at the outer edge of the hole before the main cutting edges remove the core material. This scoring action severs wood fibres cleanly at the perimeter, preventing tearout, chipping, and surface delamination - especially important when drilling through laminates, coated panels, and veneered surfaces where a clean entry is critical to finished product quality.
Why does this drill have 4 flutes if it only has 2 cutting edges?
The 2 HW cutting edges (Z2) do the actual material removal at the tip, while the 4 spiral flutes serve as chip evacuation channels running along the length of the drill body. More flutes mean more pathways for chips and dust to exit the hole during drilling, which reduces packing, heat buildup, and the risk of burning - particularly in dense materials like MDF and chipboard that generate fine, compressible dust.
What shank size and style does the CMT 309.150.12 use, and is it compatible with standard boring machine chucks?
This drill uses a 10 x 20mm parallel shank with a driving flat and a length adjusting screw. The driving flat prevents the shank from rotating inside the chuck under load, and the length adjusting screw allows precise setting of the drilling depth. This is a standard configuration for dowel drills used in multi-spindle boring machines, CNC boring centres, and panel processing equipment - check your machine's chuck specification to confirm 10mm shank compatibility.
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