Product Description
CMT 375.040.11 4 Flute Dowel Drill for Through Hole by CMT is a precision-ground carbide-tipped boring tool engineered for clean, accurate through-hole drilling in a wide range of wood-based panel materials. With a 4mm cutting diameter, 40mm cutting height, and 70mm total length, this long-series through-hole dowel drill delivers consistent performance in multi-spindle CNC boring machines, CNC boring centers, and panel processing equipment. Right-hand rotation and a two-tooth geometry make it well suited for chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels - anywhere repeatable dowel-hole accuracy matters in cabinet, furniture, and millwork production.
Key Features
- Tungsten Carbide (HW) Construction - carbide-grade tooling material delivers extended wear resistance compared to standard steel, keeping edges sharp through high-volume panel boring cycles without frequent resharpening.
- Through-Hole 60 deg. Sharpening Geometry - the 60 deg. through-hole point angle is optimized for complete panel penetration, producing clean entry and exit holes that reduce tearout on both faces of the workpiece.
- 40mm Cutting Height - the long cutting zone accommodates panels across a useful range of thicknesses, allowing the same drill to handle varying material depths without changing tooling.
- 10 x 20mm Shank (25/64" x 25/32" equivalent) - the precisely dimensioned shank seats securely in CNC boring spindles and adapters, minimizing runout and vibration for straighter, rounder holes.
- Right-Hand (RH) Rotation - compatible with the standard spindle rotation direction found on the vast majority of CNC boring centers and multi-spindle machines, ensuring drop-in compatibility with existing setups.
- Two-Tooth (Z=2) Cutting Configuration - the two-flute design efficiently clears chips from the bore during through-hole operations, reducing heat buildup and helping maintain a cleaner hole finish in MDF, chipboard, and laminate panels.
- 70mm Total Length (Long Series) - the extended overall length provides the reach required by multi-spindle boring machines where spindle spacing and clamping depth demand longer tooling.
Why This Product
- Purpose-built for through-hole dowel boring - unlike general-purpose twist drills, this bit is specifically designed to produce clean through-holes at the correct 60 deg. point angle, making it the right choice for dowel joint production in cabinet and furniture panels.
- Carbide (HW) tooling for demanding production environments - HW-grade carbide construction resists the abrasive nature of MDF, chipboard, and coated laminates, making this drill a durable option for shops running high part counts where edge retention matters.
- Long-series 70mm length for CNC boring machine compatibility - the 70mm overall length and precisely ground 10 x 20mm shank are sized to fit CNC boring centers and multi-spindle panel boring machines directly, eliminating the need for adapters in most standard configurations.
- Consistent hole quality across multiple compatible materials - the through-hole geometry and carbide cutting edges perform across chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels, reducing the number of specialized tools needed for mixed-material production.
Specifications
- Manufacturer Part Number: 375.040.11
- Brand: CMT Orange Tools
- Diameter: 4mm
- Cutting Height: 40mm
- Total Length: 70mm
- Shank: 10 x 20mm
- Number of Teeth: 2
- Sharpening Geometry: Through holes 60
- Rotation: Right-hand (RH)
- Material: HW (Tungsten Carbide)
- Series: Through Hole Long Series (70mm)
Approved Applications
- Multi-spindle CNC boring machines
- CNC boring centers
- Panel processing centers
- Boring machines with adapter or chuck
- Chipboard and particleboard panels
- MDF and HDF panels
- Hardwood and softwood solid wood
- Plywood
- Laminates and coated panels
- Through-hole dowel joint production in cabinet and furniture manufacturing
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill, like this CMT 375.040.11, is designed to bore a hole completely through the panel from one face to the other. The 60 deg. through-hole point angle is ground specifically for this type of cut, producing clean entry and exit on both panel faces. A blind-hole drill, by contrast, is configured to stop at a defined depth inside the material without exiting the other side.
What shank size does this drill use, and will it fit my CNC boring spindle?
This drill has a 10 x 20mm shank (equivalent to 25/64" diameter x 25/32" grip length). This is a standard shank dimension for CNC boring centers and multi-spindle panel boring machines. If your machine uses a standard 10mm boring spindle, this drill will seat directly without additional adapters. Always verify your machine's spindle specification before mounting.
Can this drill be used on MDF and laminate-coated panels without causing tearout?
Yes. The CMT 375.040.11 is listed as compatible with MDF, HDF, chipboard, laminates, and coated panels. The carbide (HW) cutting edges and through-hole 60 deg. geometry are suited to these abrasive and surface-sensitive materials. The through-hole point angle helps produce a controlled exit hole, which reduces the risk of tearout on the panel's exit face.
What does the "long series" designation mean for this drill?
The long series designation refers to the 70mm total length of this drill. Standard short-series boring bits are typically shorter and are used in machines where spindle depth and clamping allow it. The 70mm long-series length provides additional reach, making this bit appropriate for CNC boring centers and multi-spindle machines where the clamping mechanism, spindle spacing, or panel thickness requires a longer tool to reach the cutting zone effectively.
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