Product Description
CMT 314.050.12 Dowel Drill for Through Holes - 5 x 35 x 70mm Left-Hand Rotation is a precision-engineered, carbide-tipped boring tool designed for clean, accurate through-hole drilling in panel processing and furniture manufacturing. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotation drill produces consistent, blowout-free bores in chipboard, MDF, hardwood, softwood, plywood, laminates, and coated panels - making it a dependable choice for multi-spindle boring machines and CNC panel processing centers. The PTFE-coated spiral and precision-balanced centre point work together to maintain accuracy and extend tool life across demanding production cycles.
Key Features
- HW (Tungsten Carbide) Cutting Head - delivers long-lasting edge retention and consistent bore quality even in abrasive materials like chipboard, MDF, and coated panels, reducing the need for frequent resharpening.
- Super-Strength Steel Body - provides the rigidity needed to maintain runout precision at high cycle rates, keeping bores on-center and minimizing vibration during through-hole drilling operations.
- PTFE-Coated Spiral Flutes - the orange or black PTFE coating prevents pitch and adhesive buildup on the flutes, allowing chips to clear freely and keeping cutting performance consistent across extended production runs.
- Precision-Balanced Centre Point - ensures the drill registers accurately on entry, reducing wandering at the start of each bore and producing holes that align correctly for dowel joinery assembly.
- 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges spread the cutting load evenly, producing smooth bore walls and clean exit faces that minimize blowout on through-hole applications.
- 2 Spiral Flutes - efficient chip evacuation through the dual spiral design helps prevent clogging and heat buildup, which is especially important when drilling through the full panel thickness.
- Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 26mm shank with driving flat locks securely in boring machine collets, while the length-adjusting screw allows precise depth setting for consistent through-hole positioning.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring correct cutting geometry and clean hole entry from the correct side of the panel.
- Sharpening Specification - Through Holes 60 - this drill is engineered and approved for resharpening to through-hole geometry at 60, extending usable tool life and reducing long-term tooling cost.
Why This Product
- The 5mm diameter and 35mm cutting height make this drill well-suited for drilling through panels where standard dowel connections are required, providing the depth coverage needed for full-thickness panel boring without bottoming out prematurely.
- The left-hand rotation designation means this tool is purpose-built for LH spindle stations - using the correct rotation avoids cutting geometry errors that would lead to rough walls, tearout, or inaccurate hole placement on dowel connection faces.
- The combination of a PTFE-coated spiral and a carbide cutting head addresses two of the most common through-hole boring problems simultaneously - adhesive buildup on the flutes and premature edge wear at the cutting face - keeping quality consistent over high-volume panel runs.
- The parallel shank with driving flat and length-adjusting screw is designed for repeatable setup in multi-spindle and CNC boring machines, so operators can quickly index the drill to the correct depth without time-consuming trial adjustments between jobs.
Specifications
- Manufacturer Part Number: 314.050.12
- Brand: CMT Orange Tools
- Description: Dowel Drill for Through Hole 5 x 35 x 70mm LH
- Diameter: 5mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 26mm (parallel shank with driving flat and length-adjusting screw)
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2 (Z2)
- Number of Flutes: 2
- Blade Material: HW (Tungsten Carbide)
- Sharpening: Through holes 60
- Application Type: Through Hole Dowel Drilling
Approved Applications
- Through-hole dowel connection drilling in furniture manufacturing
- Panel processing on chipboard, MDF, and HDF
- Through-hole boring in hardwood and softwood panels
- Drilling laminates and coated panels for dowel joinery
- Plywood and multi-layer panel boring
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center applications
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill, and does this model cover through-hole applications?
Yes - this drill is specifically designed for through-hole applications. Unlike blind-hole bits that stop at a set depth, through-hole dowel drills like this 5 x 35 x 70mm model are engineered to pass completely through the panel, producing a clean bore on both the entry and exit faces. The dual precision-ground cutting edges and PTFE-coated spiral flutes work together to minimize blowout as the drill exits the panel material.
Why does this drill have left-hand (LH) rotation, and how do I know if my boring machine uses LH spindles?
Left-hand rotation means the drill spins counter-clockwise when viewed from the shank end. Multi-spindle boring machines and CNC boring centers are typically equipped with both right-hand and left-hand spindle positions to accommodate simultaneous horizontal boring from both sides of a panel. Check your machine's spindle layout or manual to confirm which positions require LH tooling - installing an LH drill on an RH spindle will produce poor results and can damage the tool or workpiece.
Can this drill be resharpened, and what sharpening specification applies?
Yes. This drill is approved for resharpening to through-hole geometry. The specified sharpening parameter is Through Holes 60. Resharpening extends usable tool life and can reduce long-term tooling costs compared to single-use tools, provided the resharpening is performed to the correct geometry for through-hole boring.
What materials can this 5mm dowel drill be used on?
This drill is suited for chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels. The HW (tungsten carbide) cutting head provides the hardness and edge retention needed to handle the abrasive qualities of engineered wood products like chipboard and MDF, while the PTFE-coated spiral helps manage adhesive and resin buildup that is common when boring through coated or laminated panel surfaces.
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