Product Description
The CMT Solid Carbide Upcut Spiral Router Bit - 1/2 in. x 1 1/2 in. x 3 1/2 in. with 1/2 in. shank is a precision-ground routing tool engineered for professionals and serious woodworkers who demand clean, efficient cuts in deep slots, through-cuts, and pockets. Built entirely from a special super-micrograin carbide formulation, this right-hand spiral bit produces a keen, long-lasting cutting edge that shears wood cleanly while ejecting chips upward for continuous, unobstructed cutting performance. Whether you are running CNC routing operations, working at a router table, or using a handheld router, this 2-flute upcut spiral delivers the chip evacuation efficiency and edge retention needed for demanding production work in hardwood, softwood, plywood, MDF, and engineered sheet goods.
Key Features
- Special Super-Micrograin Carbide Formulation - a proprietary carbide blend engineered to produce and hold a keen cutting edge longer than standard carbide, meaning fewer tool changes and more consistent cut quality over the life of the bit.
- Solid Carbide Construction (HWM Material Grade) - the entire bit is manufactured from premium micrograin carbide rather than a carbide-tipped design, providing superior wear resistance throughout the full cutting height and allowing for more resharpenings before replacement.
- Low-Angle Upcut Spiral Geometry - designed specifically to shear wood cleanly and provide efficient chip ejection upward out of the cut, keeping deep slots and pockets clear of debris and reducing heat buildup at the cutting edge for cooler tool operation.
- Cooler Running Tool Performance - the low-angle spiral design causes the tool to run cooler during operation, which directly extends cutting edge life and reduces the risk of burning or scorching sensitive wood species and composites.
- 2-Flute Configuration with 1/2 in. Cutting Diameter - the twin-flute geometry balances chip load and feed rate efficiently, producing a cleaner finish on the bottom face of the cut while maintaining smooth, stable rotation at the 1/2 in. shank.
- 1/2 in. Shank - the full 1/2 in. shank provides a rigid, secure connection in standard collets on CNC routers, router tables, and handheld routers, minimizing runout and vibration for more precise cutting results.
- 1 1/2 in. Cutting Height - the generous flute length accommodates through-cuts in thick stock and full-depth passes in deep pockets without repositioning, saving time on multi-pass setups.
- Right-Hand Rotation - compatible with the standard right-hand collet direction on virtually all routers and CNC routing machines, ensuring straightforward drop-in compatibility without special tooling requirements.
Why This Product
- For CNC routing and production environments where chip evacuation is critical, the upcut spiral geometry pulls chips upward and out of deep pockets with each pass - preventing recutting of chips that would otherwise degrade surface quality and accelerate edge wear.
- The super-micrograin carbide formulation is purpose-built to hold a sharper edge for longer than conventional carbide grades, making this bit a cost-effective choice for high-volume routing in hardwood, plywood, MDF, and laminated panels where edge durability directly affects throughput.
- With a 1 1/2 in. cutting height on a 3 1/2 in. overall length, this bit handles full-depth through-cuts in standard sheet goods in a single pass, reducing setup time and improving consistency across repeated cuts.
- The solid carbide construction - as opposed to carbide-tipped alternatives - means the cutting geometry remains consistent even after multiple resharpenings, preserving the low-angle spiral profile that makes this bit effective for clean wood shearing throughout its service life.
Specifications
- Manufacturer Part Number: 191.506.11
- Brand: CMT Orange Tools
- Product Type: Solid Carbide Upcut Spiral Router Bit
- Diameter: 1/2 in.
- Cutting Height: 1 1/2 in.
- Total Length: 3 1/2 in.
- Shank: 1/2 in.
- Number of Teeth: 2
- Blade Material: Solid Carbide (HWM - Super-Micrograin Carbide)
- Rotation: Right-Hand (RH)
Approved Applications
- CNC Routing
- Through-Cuts in Solid Wood and Sheet Goods
- Deep Pocket Routing
- Chip Evacuation Routing in Deep Slots
- Router Table Operations
- Handheld Router Work
- Routing in Solid Hardwood and Softwood
- Routing in Plywood, MDF, Chipboard, and Laminates
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 solid carbide model, pulls chips upward and out of the cut during routing. This makes it the preferred choice for deep pockets, through-cuts, and any operation where chip evacuation is a priority - such as CNC routing in MDF, plywood, or solid wood. The upcut geometry produces the cleanest finish on the bottom face of the cut. A downcut spiral pushes chips downward and is typically chosen when a clean top surface finish is the priority. Choose this upcut bit when routing depth, chip clearing efficiency, and bottom-face finish quality are the main concerns.
Why is solid carbide construction better than a carbide-tipped bit for this type of routing?
Because the entire bit is manufactured from the same super-micrograin carbide material throughout, rather than having carbide inserts brazed onto a steel body, solid carbide construction provides consistent hardness and wear resistance across the full cutting edge. This allows the bit to be resharpened multiple times while retaining its low-angle spiral geometry - meaning more usable life per bit and more consistent performance across the full 1 1/2 in. cutting height. Solid carbide is also more rigid, which reduces deflection during demanding CNC routing passes.
Is this bit compatible with standard CNC routers and router tables that use a 1/2 in. collet?
Yes. This bit features a 1/2 in. shank with right-hand rotation, which is the standard configuration for the vast majority of CNC routing machines, router tables, and handheld routers equipped with a 1/2 in. collet. No adapters or special tooling are required for typical setups. Confirm that your router or CNC spindle accepts a 1/2 in. collet before installing.
What materials can this upcut spiral bit cut effectively?
The low-angle spiral geometry and super-micrograin carbide formulation are designed to shear wood cleanly, making this bit well-suited for solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic. The upcut chip ejection is particularly effective when routing deeper into dense or layered materials where chip packing would otherwise cause heat buildup and premature edge wear.
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