Product Description
CMT 316.080.11 Countersink for 4 Flute Drills - 5/16" Diameter, Right-Hand Rotation is a precision carbide countersink designed to work in tandem with 4-flute dowel drills, delivering both drilling and countersinking capability in a single, efficient pass. With a 45 deg. cutting angle and right-hand (RH) rotation, this CMT countersink is engineered for clean, accurate results in woodworking panel processing applications where speed and surface quality matter. Its compact 15mm total length and 8mm bore diameter make it well suited for multi-spindle boring machines and CNC boring centers handling chipboard, MDF, hardwood, plywood, and coated panels.
Key Features
- 45 deg. Cutting Angle - produces a standard countersink profile that seats fastener heads flush, eliminating the need for secondary finishing passes and improving overall workflow efficiency.
- 18mm Diameter Cutting Head - provides a generous countersink recess suited to panel joinery and hardware fitting tasks where consistent seat diameter is critical to assembly quality.
- 8mm Bore Diameter - fits directly onto the standard 8mm spindle shafts found in multi-spindle CNC boring machines and panel processing centers, allowing quick tool changes with no adapters required.
- Right-Hand (RH) Rotation - matched to standard machine spindle direction, ensuring safe, chatter-free cutting and predictable tool performance during high-volume runs.
- 2-Tooth Cutting Geometry - balanced flute configuration supports stable, vibration-reduced cutting at production feed rates, contributing to cleaner countersink walls and longer tool life.
- Hard Metal (HW) Construction - solid carbide material delivers superior hardness and heat resistance compared to high-speed steel, extending service life even in abrasive engineered wood panels and laminates.
- 15mm Compact Total Length - short-body design minimizes deflection and runout in close-tolerance boring heads, helping maintain precision across repetitive production cycles.
Why This Product
- Designed specifically to pair with 4-flute dowel drills, this countersink allows boring and countersinking to happen simultaneously - cutting cycle times on panel lines and CNC boring centers without sacrificing hole quality.
- The HW (hard metal / carbide) construction handles the demands of abrasive materials like chipboard, MDF, HDF, and coated panels that rapidly dull softer tooling, making it a practical choice for shops processing large volumes of engineered wood products.
- With an 8mm bore diameter that fits standard machine spindles directly, this tool integrates into existing multi-spindle boring setups without requiring special adapters or time-consuming modifications.
- The 45 deg. cutting angle is a widely recognized standard for flush-seat countersinking, meaning this tool works with a broad range of screw heads and hardware fittings used in cabinet and furniture manufacturing.
Specifications
- Manufacturer Part Number: 316.080.11
- Brand: CMT Orange Tools
- CMT Part Number: CMT-316.080.11
- Diameter: 18mm
- Bore Diameter: 8mm
- Total Length: 15mm
- Cutting Angle: 45 deg.
- Number of Teeth: 2
- Rotation: Right-Hand (RH)
- Blade Material: HW (Hard Metal / Carbide)
- Nominal Diameter: 5/16 in.
Approved Applications
- Chipboard and particleboard panels
- MDF (medium-density fiberboard)
- HDF (high-density fiberboard)
- Hardwood
- Softwood
- Plywood
- Laminates and coated panels
- Multi-spindle CNC boring machines
- CNC boring centers
- Panel processing centers
- Boring machines with adapter or chuck
Frequently Asked Questions
What drill types is this countersink designed to work with?
This countersink is designed specifically for use with 4-flute dowel drills. The 4-flute configuration allows for higher feed rates, and pairing this countersink with those drills enables drilling and countersinking to be completed in a single pass, reducing machine cycle time on panel processing lines.
What spindle bore size is required to mount this countersink?
The CMT 316.080.11 has a bore diameter of 8mm, which is the standard spindle dimension for many multi-spindle CNC boring machines and panel processing centers. No adapters are needed when mounting to a compatible 8mm spindle.
What cutting angle does this countersink produce?
This countersink cuts at a 45 deg. angle. This is a standard angle used in furniture and cabinet manufacturing for seating fastener heads flush with or below the panel surface, and it is compatible with a wide range of hardware fittings used in wood panel joinery.
What materials can this countersink cut effectively?
The HW (hard metal / carbide) construction makes this tool effective in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels. Carbide maintains its cutting edge longer than high-speed steel when working with abrasive engineered wood products, making it appropriate for high-volume production environments.
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.