Product Description
CMT 316.100.12 Countersink for 4 Flute Drills - 25/64" Diameter, Left-Hand Rotation is a precision-engineered countersinking tool from CMT, designed to deliver clean, accurate countersink profiles in a single pass. Built from HW (tungsten carbide) material, this LH-rotation countersink features a 45 deg. cutting angle and a 20mm body diameter, making it a reliable choice for CNC boring operations and multi-spindle panel processing where consistent, repeatable results are essential.
Key Features
- 45 deg. Cutting Angle - produces a precise, uniform countersink profile that ensures fastener heads seat flush and clean without secondary finishing passes.
- HW (Tungsten Carbide) Construction - carbide material delivers exceptional hardness and wear resistance, extending tool life through high-volume production runs on demanding panel materials.
- Left-Hand (LH) Rotation - engineered specifically for LH-configured spindles on CNC boring centers and multi-spindle machines, ensuring correct chip evacuation and surface quality on the correct rotation axis.
- 20mm Body Diameter with 10mm Bore - compact proportions fit standard LH spindle tooling holders, allowing easy integration into existing machine setups without adapter modifications.
- 2-Tooth Cutting Configuration - balanced twin-flute geometry promotes stable cutting action and reduces vibration, contributing to a smoother countersink surface finish.
- 15mm Total Length - short, rigid profile minimizes deflection during operation, helping to maintain accurate countersink depth and angle consistency across repeated tool cycles.
Why This Product
- The LH rotation designation makes this countersink a direct, purpose-built fit for left-hand spindle positions on multi-spindle CNC boring machines and boring centers - eliminating the guesswork of adapting RH tooling to LH applications.
- HW tungsten carbide construction means the cutting edges hold their geometry longer than high-speed steel alternatives, reducing downtime for tool changes in production environments processing chipboard, MDF, plywood, and similar sheet goods.
- The 45 deg. countersink angle is a widely specified standard angle, making this tool compatible with a broad range of fastener head geometries used in furniture and panel manufacturing workflows.
- At a 10mm bore diameter, this countersink mounts directly onto standard 10mm parallel shanks and spindle arbors common in CNC boring centers, allowing fast changeovers with no additional tooling investment.
Specifications
- Manufacturer Part Number: 316.100.12
- Brand: CMT Orange Tools
- Cutting Angle: 45 deg.
- Body Diameter: 20mm
- Bore Diameter: 10mm
- Total Length: 15mm
- Rotation: Left-Hand (LH)
- Number of Teeth: 2
- Blade Material: HW (Tungsten Carbide)
Approved Applications
- Chipboard and particle board panels
- MDF and HDF sheet goods
- Hardwood and softwood solid lumber
- Plywood and multi-layer panels
- Laminates and coated panels
- CNC boring center operations requiring LH spindle tooling
- Multi-spindle boring machine countersinking cycles
- Panel processing center workflows for furniture and cabinetry production
Frequently Asked Questions
What machines is this countersink compatible with?
This countersink is designed for use on multi-spindle CNC boring machines, CNC boring centers, and panel processing centers equipped with left-hand (LH) rotating spindles. It fits standard 10mm bore tooling holders and parallel shank arbors common on these machine types.
Why does the rotation direction matter for a countersink?
In multi-spindle boring machines, individual spindles rotate in opposite directions depending on their position. Using a right-hand tool on a left-hand spindle results in incorrect cutting action, poor surface finish, and premature tool wear. The LH designation on this countersink confirms it is engineered to cut correctly when the spindle rotates in the left-hand direction.
What does the 45 deg. cutting angle mean for my application?
The 45 deg. angle refers to the half-angle of the countersink cone. This is a standard geometry that accommodates a wide range of flat-head and countersunk fasteners used in furniture, cabinetry, and panel assembly. Matching the countersink angle to your fastener specification ensures a flush, stable seating surface.
What is the significance of the HW material designation?
HW designates a solid or tipped tungsten carbide cutting material. Tungsten carbide is significantly harder than high-speed steel, which means it retains a sharp cutting edge over a longer period, particularly when processing abrasive materials such as MDF, chipboard, laminates, and coated panels. This translates directly to longer intervals between tool replacements in production environments.
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