Product Description
The CMT 191.505.11 Solid Carbide Upcut Spiral Bit is a professional-grade routing tool engineered for clean, efficient material removal in deep slots, pockets, and through-cuts. Built from a special super-micrograin carbide formulation, this 1/2 in. diameter spiral router bit delivers a keen, long-lasting cutting edge and a low-angle spiral geometry that shears wood cleanly while ejecting chips upward for uninterrupted performance. Whether you are running a CNC routing machine, a router table, or a handheld router, this right-hand upcut spiral bit handles solid hardwood, softwood, plywood, MDF, and a wide range of sheet goods with consistent results.
Key Features
- Special Super-Micrograin Carbide Formulation - this proprietary material produces and holds a keen cutting edge far longer than conventional carbide, meaning fewer bit changes, more consistent cuts, and a lower cost per use over time.
- Low-Angle Upcut Spiral Geometry - designed specifically to shear wood cleanly rather than tear it, producing a superior finish on the bottom face of the cut while actively pulling chips up and out of the work zone to prevent clogging.
- Efficient Chip Ejection - the upcut spiral action evacuates chips upward during deep slot and pocket routing, keeping the cutting zone clear, reducing heat buildup, and allowing the tool to run cooler for extended edge life.
- Solid Carbide Construction - the entire bit body is manufactured from premium micrograin carbide rather than a carbide-tipped steel body, providing superior wear resistance and allowing for more resharpenings before the bit must be replaced.
- 2-Flute Design with 1 1/4 in. Cutting Height - two cutting edges working together deliver balanced chip load and smooth feed rates across a 1 1/4 in. cutting depth, making this bit well-suited to full-depth passes in common material thicknesses.
- 1/2 in. Shank Diameter - the heavy 1/2 in. shank provides maximum rigidity and minimal vibration in router tables and CNC spindles, resulting in tighter tolerances and a cleaner surface finish.
Why This Product
- The super-micrograin carbide formulation and low-angle spiral work together so the tool runs cooler and the edges last longer - a direct advantage for production environments or frequent use where downtime from dull bits is costly.
- With a 1 1/4 in. cutting height and 3 in. total length, this bit reaches sufficient depth for dadoes, deep pockets, and through-cuts in standard sheet goods without requiring multiple plunge passes.
- The upcut spiral geometry is the right choice when chip evacuation is the priority - ideal for CNC routing, deep slot work, and any application where chip packing would otherwise degrade cut quality or overheat the bit.
- Solid carbide construction means this bit can be resharpened multiple times, extending the usable life beyond that of a carbide-tipped alternative and delivering better long-term value for high-frequency routing work.
Specifications
- Manufacturer Part Number: 191.505.11
- Brand: CMT Orange Tools
- Product Type: Solid Carbide Upcut Spiral Bit
- Diameter: 1/2 in.
- Cutting Height: 1 1/4 in.
- Total Length: 3 in.
- Shank Diameter: 1/2 in.
- Number of Teeth: 2
- Rotation: Right-Hand (RH)
- Blade Material: Solid Carbide (Super-Micrograin)
Approved Applications
- CNC Routing
- Through-Cuts
- Deep Pocket Routing
- Deep Slot Routing
- Chip Evacuation Routing
- Solid Hardwood
- Softwood
- Plywood
- MDF
- Chipboard
- Laminates
- Melamine
- Plastic
Frequently Asked Questions
What makes an upcut spiral bit different from a downcut spiral bit?
An upcut spiral bit ejects chips upward and out of the cut as it routes. This provides efficient chip evacuation in deep slots and pockets, keeps the cutting zone clear, and produces the cleanest finish on the bottom face of the cut. A downcut bit pushes chips downward instead, which favors a cleaner top-face finish but can cause chip packing in deep cuts.
What machines is this 1/2 in. shank upcut spiral bit compatible with?
This bit is compatible with any router or CNC spindle that accepts a 1/2 in. collet, including CNC routing machines, router tables, and handheld routers equipped with a 1/2 in. collet. Always confirm your machine accepts a 1/2 in. shank before mounting.
Why does the bit material matter - what is super-micrograin carbide?
Super-micrograin carbide is a specially formulated solid carbide material with an extremely fine grain structure. This allows the cutting edge to be ground sharper and to hold that edge longer under repeated use. The result is cleaner cuts, a cooler-running tool, and more resharpenings before the bit needs to be replaced - compared to standard carbide-tipped router bits.
Can this bit be resharpened?
Yes. Because the entire bit is constructed from solid carbide rather than a steel body with brazed carbide tips, it can be resharpened multiple times by a qualified sharpening service. This extends the usable life of the bit and represents a practical long-term cost advantage over single-use or carbide-tipped alternatives.
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