Product Description
CMT 309.050.12 Dowel Drill - 5 x 43 x 70mm Left-Hand Rotation is a precision-engineered boring tool built for high-volume panel drilling, dowel joinery, and furniture manufacturing applications. Designed by CMT, this 5mm diameter, left-hand (LH) rotating dowel drill features a hardwood-grade tungsten carbide (HW) cutting head, 4 spiral flutes, and a super-strength steel body - making it the right choice for drilling clean, flat-bottomed blind holes in chipboard, MDF, hardwood, softwood, and coated panels. With a 43mm cutting height and 70mm overall length, this long-series boring bit handles deeper blind holes where standard-length drills fall short.
Key Features
- HW (Tungsten Carbide) Cutting Head - delivers extended tool life and consistent cutting performance even in abrasive engineered panels like MDF and chipboard, reducing downtime from frequent tool changes.
- Precision-Balanced Centre Point - ensures accurate hole positioning from the very first contact, eliminating drift and maintaining tight tolerances in automated boring applications.
- 2 HW Precision-Ground Cutting Edges (Z2) - provide clean, smooth bore walls on every pass, resulting in a finished hole that requires no secondary cleanup before dowel insertion.
- 2 Negatively Ground Spurs (V2) - score the panel surface cleanly before the cutting edges engage, preventing tearout and delamination on laminates and coated panels.
- 4 Spiral Flutes - efficiently evacuate chips and sawdust from the bore during drilling, reducing heat buildup and protecting both the workpiece and the tool edge.
- PTFE-Coated Cutter Portion - the black or orange PTFE coating resists pitch and glue adhesion, keeping the tool clean and operating smoothly throughout extended production runs.
- Super-Strength Steel Body - provides the structural rigidity needed to withstand the forces of multi-spindle CNC boring without deflection or vibration.
- Parallel Shank with Driving Flat and Length Adjusting Screw (10 x 20mm) - allows secure, repeatable mounting in boring machine chucks or adapters, and enables precise depth setting for consistent blind-hole depth across all spindles.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, ensuring proper cutting direction and surface quality on LH-side boring heads.
- 43mm Cutting Height / 70mm Overall Length - the long-series format accommodates thicker panel stock and deeper boring requirements that shorter-series bits cannot reach.
Why This Product
- The left-hand rotation specification makes this drill a direct, purpose-built solution for LH spindle positions on multi-spindle CNC boring machines - using a right-hand bit in this position would produce poor hole quality and accelerated wear.
- The combination of negatively ground spurs and a precision-balanced centre point means panel faces, laminates, and coated surfaces are scored cleanly before material is removed - a critical advantage when drilling coated or high-value panels where surface damage is unacceptable.
- At 70mm overall length with a 43mm cutting height, this long-series dowel drill reaches deeper blind holes than standard-length alternatives, making it suitable for thicker panel stock used in cabinet carcass and furniture frame construction.
- The PTFE-coated cutter body and 4-flute chip evacuation design work together to minimize resin and adhesive buildup during continuous production runs, helping maintain cut quality over longer intervals between tool cleaning.
Specifications
- Manufacturer Part Number: 309.050.12
- Brand: CMT Orange Tools
- Product Type: Dowel Drill
- Diameter: 5mm
- Cutting Height: 43mm
- Total Length: 70mm
- Shank: 10 x 20mm
- Shank Style: Parallel shank with driving flat and length adjusting screw
- Rotation: Left-Hand (LH)
- Number of Flutes: 4
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Spur Grind: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Body Material: Super-strength steel
- Coating: Black or orange PTFE on cutter portion
Approved Applications
- Drilling blind holes for dowel joinery connections
- Panel drilling in furniture manufacturing
- Cabinet making and carcass assembly
- Boring operations on chipboard and particleboard
- Drilling MDF and HDF panels
- Processing hardwood and softwood components
- Boring laminates and coated panel surfaces
- Left-hand spindle positions on multi-spindle boring machines
- CNC boring center applications
- Panel processing center operations
Frequently Asked Questions
Why does this drill use left-hand (LH) rotation, and how do I know if I need it?
Left-hand rotation means the drill spins counter-clockwise when viewed from the shank end. Multi-spindle CNC boring machines and panel boring centers have dedicated left-hand spindle positions that require LH bits to cut correctly. If your spindle rotates counter-clockwise, you need an LH drill. Using a right-hand bit in a left-hand spindle position will cause poor hole quality, surface tearout, and rapid tool wear. Check your machine's spindle direction before selecting a bit.
What materials can this 5mm dowel drill bore through cleanly?
The HW (tungsten carbide) cutting head and negatively ground spurs make this drill well suited for chipboard, MDF, HDF, hardwood, softwood, and coated or laminated panels. The spur design scores the surface before the cutting edges remove material, which prevents delamination and tearout - making it particularly useful for laminates and finished panel faces where surface quality matters.
What does the PTFE coating on the cutter portion do?
The black or orange PTFE coating applied to the cutter portion of the drill resists pitch and glue adhesion. During continuous panel boring operations, resin and adhesive from engineered wood products can build up on cutting tools, degrading cut quality and increasing friction. The PTFE coating reduces this buildup, helping maintain consistent boring performance and extending the intervals between tool cleaning or replacement.
How does the parallel shank with a driving flat and length adjusting screw work in practice?
The 10 x 20mm parallel shank seats into the spindle chuck or adapter of the boring machine. The driving flat prevents the bit from rotating within the chuck under cutting load. The length adjusting screw allows you to fine-tune the axial position of the drill, which lets you set a precise and repeatable blind-hole depth. This is especially important on multi-spindle machines where consistent depth across all spindles is required for accurate dowel alignment during assembly.
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.