Product Description
CMT Solid Carbide Upcut Spiral Router Bit - 1/8" Diameter, 1/2" Cutting Height, 1/4" Shank is a precision spiral milling tool engineered from a super-micrograin carbide formulation that holds a keen cutting edge longer than standard carbide-tipped alternatives. Designed for CNC routing machines, router tables, and handheld routers, this 2-flute upcut spiral bit shears wood cleanly while ejecting chips upward out of the cut - keeping deep slots, pockets, and through-cuts clear of debris for accurate, consistent results. Whether you are profiling solid hardwood, cutting plywood, or machining MDF and plastic, the low-angle spiral geometry delivers efficient chip evacuation and a clean finish on the lower face of each pass.
Key Features
- Super-Micrograin Solid Carbide Construction - the entire bit is manufactured from a special super-micrograin carbide formulation that produces and holds a keen cutting edge, meaning longer time between sharpenings and more resharpenings over the tool's lifetime compared to carbide-tipped bits.
- Low-Angle Upcut Spiral Geometry - designed specifically to shear wood cleanly and provide efficient chip ejection, so chips are pulled upward and out of the cut rather than packing into the kerf, which reduces heat buildup and improves cut quality in deep pockets and slots.
- Cooler Running Performance - the combination of the super-micrograin carbide formulation and the optimized spiral angle causes the tool to run cooler during operation, extending cutting edge life and reducing the risk of scorching or burning on heat-sensitive materials.
- 2-Flute Configuration - dual cutting edges balance chip load and feed rate capability, making this bit well-suited for a wide range of materials including solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic.
- 1/4" Shank Compatibility - fits standard 1/4" collets found on most routers and CNC spindles, offering broad machine compatibility without the need for a collet reducer.
- Right-Hand Rotation - matches the standard direction of virtually all routers and CNC routing spindles, ensuring immediate drop-in compatibility with your existing tooling setup.
Why This Product
- The 1/8" diameter is ideal for intricate detail work, tight-radius pockets, and fine inlay cuts on CNC routers where a larger bit simply cannot fit - making this an essential tool for detailed woodworking and sign-making applications.
- The upcut spiral design actively clears chips out of deep slots and pockets during the cut, reducing the need to pause and clear the work area and helping prevent chip re-cutting that can degrade surface quality.
- Solid carbide construction throughout - not carbide-tipped - means the bit maintains its geometry and edge sharpness over a longer service life, and can be resharpened more times before retirement, lowering the long-term cost per cut.
- The low-angle spiral was engineered specifically to shear wood fibers cleanly rather than tear them, which is particularly valuable when working with plywood veneers, melamine, or laminates where surface tearout must be minimized on the bottom face of the cut.
Specifications
- Manufacturer Part Number: 191.001.11
- Brand: CMT Orange Tools
- Product Type: Solid Carbide Upcut Spiral Bit
- Diameter: 1/8"
- Cutting Height: 1/2"
- Total Length: 2"
- Shank: 1/4"
- Number of Teeth: 2
- Material: Solid Carbide (HWM Super-Micrograin)
- Rotation: Right-Hand (RH)
- Macro Class: Router Cutter
Approved Applications
- CNC Routing
- Through-Cuts
- Chip Evacuation Routing
- Deep Pockets and Slots
- Detail and Inlay Work
- Router Table Operations
- Handheld Router Operations
Frequently Asked Questions
What is the difference between an upcut spiral bit and a downcut spiral bit, and when should I use this one?
An upcut spiral bit like this CMT 191.001.11 pulls chips upward and out of the cut during routing. This makes it the preferred choice for deep pockets, through-cuts, and slots where chip evacuation is a priority, because it keeps the kerf clear and reduces heat buildup. It also produces the cleanest finish on the bottom face of the cut. A downcut bit, by contrast, pushes chips downward and delivers a cleaner top-face finish - useful when top-surface tearout is the primary concern. For CNC routing of deep profiles in wood and wood composites, the upcut geometry of this bit is generally the better choice.
What materials can this solid carbide spiral bit cut?
This bit is suited for solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic. The super-micrograin carbide formulation and the low-angle upcut spiral geometry are designed to shear wood fibers cleanly, which is particularly beneficial when working with layered or laminated materials where clean edges matter.
Why does solid carbide construction matter compared to a carbide-tipped bit?
Because the entire cutting tool is formed from the same super-micrograin carbide material - not just the tips - the bit can be resharpened more times over its service life before it needs to be replaced. The uniform carbide body also provides greater consistency in edge geometry after each resharpening. Additionally, the micrograin formulation is engineered to produce and hold a keener cutting edge and to run cooler during operation, which directly extends the time between sharpening intervals.
Will this bit fit my router or CNC machine?
This bit has a 1/4" shank, which is one of the two most common collet sizes (the other being 1/2") used on routers and CNC routing spindles. As long as your router or CNC spindle has a 1/4" collet or a collet set that includes a 1/4" option, this bit will mount directly without an adapter. It is a right-hand rotation bit, which matches the standard direction of virtually all consumer and professional routing equipment.
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