Product Description
CMT 190.813.11 Solid Carbide Up/Downcut Spiral Mortising Bit by CMT is a professional-grade compression router bit engineered for clean, tear-out-free cuts on both faces of a workpiece in a single pass. With simultaneous upcut and downcut spiral geometry - made possible by its 3 + 3 tooth configuration - this bit is the go-to solution for CNC through-cuts in plywood, MDF, melamine, and laminates where surface quality on top and bottom matters. The 3/8 in. diameter, 3/8 in. shank, and 1 in. cutting height make it a versatile choice for woodworking shops and production CNC environments alike.
Key Features
- Solid Carbide Construction (HWM Micrograin Carbide) - the entire bit body is machined from premium micrograin carbide, delivering superior hardness and wear resistance over carbide-tipped alternatives, and allowing more resharpenings over the life of the tool.
- Up/Downcut Compression Geometry (3 + 3 Teeth) - paired upcut and downcut flutes work simultaneously to shear both faces of the workpiece cleanly, eliminating tear-out and splintering on top and bottom surfaces - critical when routing finished panels, laminates, and melamine.
- 13/64 in. Upcut Cutting Height (I1) - the upcut portion engages the bottom face of the material first, providing a clean underside exit before the downcut flutes finish the top surface, giving precise control over compression performance through the material stack.
- 3/8 in. Shank Diameter - fits standard 3/8 in. collets on CNC routing machines, router tables, and handheld routers, providing a stable and secure grip that reduces vibration and contributes to a smoother finished cut.
- 3 in. Total Length - the extended overall length accommodates a range of workpiece thicknesses and provides adequate clearance for chip evacuation during deep CNC through-cuts.
- Right-Hand (RH) Rotation - compatible with the vast majority of standard CNC spindles and router motors, ensuring straightforward drop-in use without special tooling adapters.
Why This Product
- The compression spiral design cuts both the top and bottom surfaces of the workpiece cleanly in a single pass - eliminating the need for secondary sanding or edge cleanup when routing plywood, MDF, or melamine panels.
- Full solid carbide construction (HWM micrograin) means the cutting edges stay sharper longer than carbide-tipped bits, reducing downtime for tool changes on high-volume CNC production runs.
- The 3 + 3 tooth layout - three upcut plus three downcut flutes - balances cutting forces across both faces simultaneously, reducing chipping in brittle laminate and melamine surfaces that would otherwise splinter with a standard upcut or downcut spiral.
- A matched 3/8 in. shank and 3/8 in. cutting diameter profile makes this bit a practical fit for mortising operations and panel through-cuts on CNC machines, router tables, and handheld routers without requiring a collet adapter.
Specifications
- Manufacturer Part Number: 190.813.11
- Brand: CMT Orange Tools
- Diameter: 3/8 in.
- Cutting Height: 1 in.
- Cutting Height (I1 Upcut): 13/64 in.
- Total Length: 3 in.
- Shank Diameter: 3/8 in.
- Number of Teeth: 3 + 3
- Rotation: Right-Hand (RH)
- Blade Material: Solid Carbide (HWM Micrograin)
- Product Type: Up/Downcut Spiral Mortising Bit
Approved Applications
- CNC Routing
- Through-Cuts in Plywood and MDF
- Two-Face Finish Cuts in Laminates and Melamine
- Mortising Operations
- Panel Routing on Router Tables
- Handheld Router Through-Cuts
Frequently Asked Questions
What is the difference between the upcut and downcut sections of this bit, and why does it matter?
This bit uses a compression spiral design with 3 upcut flutes and 3 downcut flutes working together. The upcut portion - with a 13/64 in. cutting height - pulls chips upward and shears the bottom face of the material cleanly, while the downcut portion pushes chips downward and shears the top face. The result is a clean, tear-out-free edge on both surfaces simultaneously, which is especially important when routing finished plywood, melamine, or laminate panels where both faces will be visible.
What materials is this bit designed to cut?
The CMT 190.813.11 is suited for solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic. Its solid carbide (HWM micrograin) construction provides the hardness needed to handle abrasive sheet goods like MDF and laminates without rapid edge degradation.
What machines is this bit compatible with?
This bit has a 3/8 in. shank and right-hand rotation, making it compatible with CNC routing machines, router tables, and handheld routers equipped with a 3/8 in. collet. Always verify your machine's collet size and maximum RPM rating before use.
Why choose solid carbide over a carbide-tipped router bit for this type of work?
Solid carbide bits - like this HWM micrograin carbide construction - are machined entirely from carbide rather than having carbide tips brazed onto a steel body. This allows for more precise spiral flute geometry, better heat dissipation during extended CNC runs, and the ability to be resharpened more times over the life of the tool, making them a cost-effective choice for production routing environments.
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