Product Description
CMT 4 Flute Dowel Drill for Through Holes - 25/64" x 2-3/4" LH is a precision-ground, left-hand rotation through-hole dowel drill engineered for boring clean, accurate holes in panel materials including solid wood, chipboard, MDF, and laminates. Built from tungsten carbide (HW), this long-series drill delivers consistent results in multi-spindle CNC boring machines, CNC boring centers, and panel processing equipment. Its 10mm diameter and 40mm cutting height make it well-suited for through-hole drilling across a range of panel thicknesses, while the left-hand rotation matches the spindle configuration of common horizontal boring setups.
Key Features
- Tungsten Carbide (HW) Construction - hard carbide material maintains a sharp cutting edge longer than standard tool steels, reducing downtime for tool changes during high-volume panel production.
- Left-Hand (LH) Rotation - designed to match left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring correct chip evacuation and bore quality without modification.
- Through-Hole Geometry (60 deg. sharpening angle) - optimized point geometry for boring completely through panels, producing clean entry and exit holes with minimal tearout on chipboard, MDF, HDF, and laminates.
- 10mm Diameter x 40mm Cutting Height - the 40mm cutting zone accommodates through-hole drilling in panels of varying thickness, making this drill versatile across common panel processing applications.
- 10 x 20mm Shank - standard shank dimensions ensure secure, repeatable seating in compatible boring machine chucks and multi-spindle heads, reducing runout for precise hole placement.
- Long-Series 70mm Overall Length - the extended 70mm body provides clearance for deeper panel configurations and reduces interference between the spindle head and workpiece surface.
- 2-Tooth Cutting Configuration - the two-tooth geometry balances cutting speed with chip clearance, helping maintain clean bore walls in wood composites and coated panel materials.
Why This Product
- Correct LH spindle match out of the box - the left-hand rotation is built into the drill itself, so it works correctly in LH spindle positions on multi-spindle boring machines without any workarounds or adapter modifications.
- Through-hole geometry means complete panel penetration - unlike flat-bottom or blind-hole drills, the 60 deg. through-hole sharpening angle is purpose-built to exit the back face of a panel cleanly, which matters for dowel joints requiring full panel-thickness holes.
- Carbide construction suits high-cycle panel production - tungsten carbide (HW) holds its edge under the abrasive conditions created by chipboard, MDF, and laminated panels, keeping bore quality consistent over longer production runs.
- Long-series length adds setup flexibility - the 70mm overall length gives clearance in multi-spindle heads where shorter drills may not reach, reducing the need to adjust machine configurations when switching between panel thicknesses.
Specifications
- Manufacturer Part Number: 375.100.12
- Brand: CMT Orange Tools
- Diameter: 10mm
- Cutting Height: 40mm
- Total Length: 70mm
- Shank: 10 x 20mm
- Rotation: Left-Hand (LH)
- Number of Teeth: 2
- Tooth Geometry / Sharpening: Through holes 60
- Blade Material: Tungsten Carbide (HW)
- Series: Through Hole Long Series (70mm)
Approved Applications
- Chipboard
- MDF
- HDF
- Hardwood
- Softwood
- Plywood
- Laminates
- Coated Panels
Frequently Asked Questions
Why does this drill use left-hand (LH) rotation instead of right-hand?
Multi-spindle CNC boring machines and panel processing centers commonly feature both right-hand and left-hand spindles depending on their position in the head. This drill is engineered specifically for left-hand spindle positions, where LH rotation produces correct chip evacuation and clean bore walls. Using an LH drill in the correct LH spindle ensures the cutting edges engage the material properly rather than rubbing against it.
What is the difference between a through-hole drill and a blind-hole (flat-bottom) dowel drill?
A through-hole drill has a pointed tip geometry - sharpened here at a 60 deg. angle - designed to penetrate completely through the panel and exit the opposite face cleanly. A blind-hole or flat-bottom drill is ground to create a flat-bottomed pocket that stops before exiting. This CMT drill is intended only for through-hole applications where the drill must fully exit the back of the workpiece.
What machines is this dowel drill compatible with?
This drill is designed for use in multi-spindle CNC boring machines, CNC boring centers, and panel processing centers that accept a 10 x 20mm shank. It can also be used in boring machines equipped with a compatible adapter or chuck that accepts the 10mm shank diameter.
Can this drill be used on laminated and coated panels without damaging the surface?
Yes. The through-hole 60 deg. geometry and tungsten carbide (HW) cutting material are suited for drilling chipboard, MDF, HDF, laminates, and coated panels. The carbide construction maintains edge sharpness in the abrasive conditions created by resin-bonded and laminated materials, which helps produce clean entry and exit holes with reduced tearout at the panel face.
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