Product Description
The CMT 191.005.11 Solid Carbide Upcut Spiral Bit is a precision-ground 3/16 in. diameter routing tool engineered for clean, efficient material removal in CNC routing, deep pocket routing, and through-cut applications. Built entirely from a special super-micrograin carbide formulation, this 2-flute spiral upcut bit features a low-angle spiral geometry designed to shear wood cleanly while ejecting chips upward out of the cut, keeping the work area clear and the bit running cooler. With a 1/4 in. shank and a 3/4 in. cutting height in a compact 2 in. overall length, this right-hand rotation bit is well suited for handheld routers, router tables, and CNC machines working with solid hardwood, plywood, MDF, laminates, plastics, and more.
Key Features
- Super-Micrograin Solid Carbide Construction - the entire tool is manufactured from a specially formulated super-micrograin carbide, producing and holding a keener cutting edge than standard carbide, which means longer edge life between resharpenings and more cuts per bit over its service life.
- Low-Angle Upcut Spiral Geometry - the new low-angle spiral is designed specifically to shear wood cleanly rather than tear it, reducing workpiece damage and delivering a clean bottom-face finish while efficiently ejecting chips upward out of deep slots and pockets.
- Cooler Running Performance - the combination of the micrograin carbide formulation and the efficient chip ejection design allows the tool to run cooler during operation, reducing heat buildup that can burn workpieces or degrade the cutting edge prematurely.
- 2-Flute Configuration - two cutting edges provide a balance of cutting speed and chip clearance, making this bit effective for both plunge cutting into material and full-depth pass routing in grooves and pockets.
- 1/4 in. Shank Compatibility - the standard 1/4 in. shank fits the collets of most handheld routers, router tables, and CNC spindles, giving this bit broad machine compatibility without the need for adapters.
- Compact 2 in. Overall Length - the 2 in. total length keeps the bit rigid and minimizes deflection during cutting, which is especially important when routing narrow 3/16 in. diameter channels where bit flex can cause inaccurate cuts.
Why This Product
- The super-micrograin carbide formulation is specifically created to produce and hold a keen cutting edge - meaning fewer tool changes and lower cost per cut in production routing environments where bit longevity matters.
- The low-angle spiral geometry shears wood cleanly rather than lifting or tearing grain, making this bit a strong choice for fine woodworking, cabinetry, and finish routing where surface quality on the cut face is a priority.
- Upcut chip ejection keeps debris clear of deep slots and pockets, reducing recutting of chips that can cause surface defects and heat buildup - a practical advantage in CNC routing of deep grooves or inlay channels.
- At 3/16 in. diameter with a 3/4 in. cutting height, this bit fills a precise size niche useful for narrow dadoes, inlay channels, and detail routing in solid wood, plywood, MDF, and plastic where a larger bit would remove too much material.
Specifications
- Manufacturer Part Number: 191.005.11
- Brand: CMT Orange Tools
- Product Type: Solid Carbide Upcut Spiral Bit
- Diameter: 3/16 in.
- Cutting Height: 3/4 in.
- Total Length: 2 in.
- Shank: 1/4 in.
- Number of Flutes: 2
- Material: Solid Carbide (Super-Micrograin)
- Rotation: Right-Hand (RH)
Approved Applications
- CNC Routing
- Through-Cuts
- Deep Pocket Routing
- Narrow Dado and Groove Routing
- Inlay Channel Routing
- Chip Evacuation Routing
- Compatible Materials: Solid Hardwood, Softwood, Plywood, MDF, Chipboard, Laminates, Melamine, Plastic
Frequently Asked Questions
What is the difference between an upcut spiral bit and a downcut spiral bit, and which should I use?
An upcut spiral bit, like the CMT 191.005.11, ejects chips upward out of the cut. This results in efficient chip clearing in deep slots and pockets and produces the cleanest finish on the bottom face of the workpiece. A downcut bit pushes chips downward and produces a cleaner top-face finish. Choose the upcut design when working with deep grooves, through-cuts, or CNC pockets where chip evacuation is critical and bottom-face finish quality is the priority.
What machines is the 1/4 in. shank compatible with?
The 1/4 in. shank on this bit is compatible with handheld routers, router tables, and CNC routing machines that accept a 1/4 in. collet. This is one of the most common shank sizes in woodworking, giving the bit broad compatibility across a wide range of tools without requiring collet adapters.
Why is super-micrograin carbide better for holding a cutting edge?
According to CMT, the special super-micrograin carbide formulation used in this bit is specifically created to produce and hold a keen cutting edge. The finer grain structure of the carbide allows the edge to stay sharper longer compared to standard carbide formulations, so the tool runs cooler and the edges last longer between resharpenings.
Can this bit be resharpened?
Yes. Because this bit is manufactured entirely from solid carbide rather than using carbide-tipped construction, it supports multiple resharpenings over its service life. The super-micrograin carbide material is specifically formulated to hold an edge and respond well to professional sharpening, extending the overall value of the tool across its full lifespan.
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