Product Description
CMT 316.040.12 Countersink for 4 Flute Drills - 5/32" Left-Hand Rotation is a precision-engineered carbide countersink designed for left-hand (LH) boring operations on CNC and multi-spindle machines. Built from tungsten carbide (HW grade material), this compact 16mm diameter countersink delivers a clean 45 deg. chamfer angle in a single pass, making it a reliable choice for panel processing, cabinet production, and wood composite boring applications. The left-hand rotation makes it purpose-built for use alongside left-hand dowel drill configurations, where consistent countersinking and minimal tearout are essential to finished-panel quality.
Key Features
- 45 deg. Cutting Angle - produces a standard chamfer profile that seats fasteners and hardware flush, eliminating the need for secondary hand-finishing on panel surfaces.
- Hard Metal (HW) Carbide Construction - tungsten carbide grade material withstands the abrasive demands of chipboard, MDF, HDF, plywood, and coated panels, supporting longer run times between tool changes in production environments.
- Left-Hand (LH) Rotation - engineered specifically for LH spindle configurations on multi-spindle CNC boring machines and boring centers, ensuring correct chip evacuation and clean entry when paired with LH drill blocks.
- 16mm Body Diameter with 4mm Bore - the compact bore diameter allows secure mounting on compatible 4mm spindle arbors, while the 16mm cutting diameter covers a practical countersink footprint for standard panel hardware.
- 2-Tooth Cutting Configuration - dual cutting edges balance cutting load across the tool, reducing vibration and producing a smooth, consistent chamfer wall with each pass.
- 15mm Total Length - the short, rigid profile minimizes deflection during high-speed boring center operation, contributing to repeatable depth accuracy across large panel runs.
Why This Product
- The left-hand rotation is not a general-purpose spec - it is the correct choice for LH spindle bores on multi-spindle CNC boring machines and panel processing centers where using a right-hand tool would produce torn walls and incorrect chip flow.
- The HW carbide material grade supports sustained cutting performance in abrasive engineered wood panels such as MDF, HDF, chipboard, and laminated boards, where high-speed steel tools wear rapidly.
- The 45 deg. chamfer angle is a widely used standard in cabinet and furniture panel production, making this countersink directly compatible with common European-style hardware and fitting requirements.
- The compact 15mm total length and 4mm bore diameter make this countersink a practical fit for tightly spaced spindle arrangements on multi-row boring heads, where tool clearance between adjacent spindles is limited.
Specifications
- Manufacturer Part Number: 316.040.12
- Cutting Angle: 45 deg.
- Diameter: 16mm
- Bore Diameter: 4mm
- Total Length: 15mm
- Rotation: Left-Hand (LH)
- Number of Teeth: 2
- Blade Material: Hard Metal Carbide (HW)
- Brand: CMT Orange Tools
Approved Applications
- Multi-Spindle CNC Boring Machine
- CNC Boring Center
- Panel Processing Center
- Boring Machine with Compatible Adapter or Chuck
- Chipboard and Particle Board Panels
- MDF and HDF Panels
- Hardwood and Softwood
- Plywood
- Laminates and Coated Panels
Frequently Asked Questions
What does the "LH" designation mean, and why does it matter for my machine?
LH stands for left-hand rotation. This countersink is designed to spin in the left-hand (counter-clockwise) direction. It is intended for use on left-hand spindles found on multi-spindle CNC boring machines, boring centers, and panel processing centers. Installing an LH tool on a right-hand spindle would cause the tool to loosen during operation and produce poor cut quality. Always confirm your spindle rotation direction before installing this tool.
What is the bore diameter, and what size arbor or spindle does this countersink fit?
The bore diameter of this countersink is 4mm. It is designed to mount on a compatible 4mm spindle arbor on a CNC boring machine or boring center. Verify that your machine spindle matches this bore size before ordering.
What cutting angle does this countersink produce, and what applications is that angle suited for?
This countersink produces a 45 deg. chamfer angle. A 45 deg. angle is a common standard in furniture, cabinet, and panel manufacturing for seating hardware flush with the panel surface and for creating clean edge chamfers on drilled holes in materials such as MDF, chipboard, plywood, and coated panels.
What material is this countersink made from, and how does that affect its suitability for engineered wood panels?
This countersink is constructed from Hard Metal (HW) grade carbide - a tungsten carbide material known for its hardness and resistance to abrasive wear. This makes it well suited for high-production boring in abrasive engineered wood composites such as MDF, HDF, chipboard, and laminated or coated panels, where softer tool materials would wear quickly and require more frequent replacement.
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