Product Description
CMT Solid Carbide Upcut Spiral Flush Trim Bit - 2 in. x 1/2 in. x 4-1/2 in. with 1/2 in. Shank by CMT is a double-bearing flush trim router bit engineered for precise pattern routing, template trimming, and through-cuts in hardwood, softwood, and sheet goods. The upcut spiral geometry pulls chips upward and out of the cut zone, keeping the workpiece and bearing clean during deep passes and through-cuts. Built from a special super-micrograin solid carbide formulation, this bit delivers the hardness and transverse rupture strength needed for demanding CNC routing, router table, and handheld router applications alike.
Key Features
- Solid Super-Micrograin Carbide Construction - composed of a special super-micrograin carbide formulation that increases hardness and raises the transverse rupture point, meaning the bit resists chipping and breakage under heavy feed loads and stays sharp longer than standard carbide-tipped alternatives, allowing more resharpening cycles over the tool's life.
- Upcut Spiral Geometry - the upcut spiral flute design ejects chips upward and out of the cut on every pass, promoting efficient chip evacuation in deep slots, pockets, and full-thickness through-cuts while delivering the cleanest possible finish on the bottom face of the workpiece.
- Double-Bearing Design - two precision bearings - one at the tip and one at the shank end - ride the template or pattern simultaneously, distributing contact pressure evenly and reducing deflection for straighter, truer flush-trim results even at full 2 in. cutting depth.
- 2-Flute Configuration - the 2-tooth geometry balances cutting speed with chip clearance, making this bit suitable for both CNC routing applications and handheld router use where feed rate control matters.
- 1/2 in. Shank Stability - the full 1/2 in. shank provides maximum rigidity in router collets, reducing vibration and chatter during flush trimming and pattern routing passes, which translates directly to a smoother finished edge.
- Right-Hand (RH) Rotation - designed for standard right-hand router spindle rotation, making this bit compatible with the full range of CNC routing machines, router tables, and handheld routers using conventional collet systems.
Why This Product
- Handles deep flush-trim passes in a single setup - with a 2 in. cutting height, this bit can handle the full thickness of most solid hardwood stock and sheet goods without requiring multiple passes or repositioning, saving setup time on pattern routing and template trimming work.
- Double-bearing contact means more reliable pattern fidelity - by guiding along a template at two points simultaneously, the bit stays truer to the pattern profile throughout the cut, making it the right choice for production runs and detailed curved profiles where edge accuracy matters.
- Super-micrograin carbide extends tool life in demanding materials - the special carbide formulation is specifically designed for higher hardness and a higher transverse rupture point, meaning this bit holds up longer when routing hardwoods, laminates, melamine, and plastics compared to bits made from conventional carbide grades.
- 4-1/2 in. overall length provides reach for thicker workpieces and fixture clearance - the extended total length allows the bit to reach over jigs, fixtures, and clamping hardware that would obstruct shorter bits, expanding its versatility in CNC and router table setups.
Specifications
- Manufacturer Part Number: 191.507.11B
- Brand: CMT Orange Tools
- Diameter: 1/2 in.
- Cutting Height: 2 in.
- Total Length: 4-1/2 in.
- Shank: 1/2 in.
- Number of Teeth: 2
- Rotation: Right-Hand (RH)
- Material: Solid Carbide (Super-Micrograin Formulation)
- Bearing Configuration: Double Bearing
- Spiral Direction: Upcut
- Product Type: Flush Trim Router Bit
Approved Applications
- Flush trimming with template or pattern guides
- Through-cuts in solid hardwood and softwood
- Deep slot and pocket routing with active chip evacuation
- CNC routing of hardwood, plywood, MDF, and sheet goods
- Router table pattern routing
- Handheld router flush trim operations
- Trimming laminates, melamine, chipboard, and plastic panels
Frequently Asked Questions
What is the difference between an upcut spiral flush trim bit and a straight flush trim bit?
An upcut spiral bit like this one uses a helical flute that pulls chips upward and out of the cut as the bit rotates. This active chip evacuation keeps the cut path clear, reduces heat buildup, and is especially beneficial in deep through-cuts, slots, and pockets where chips can pack in and cause burning or tear-out. A straight-flute flush trim bit does not actively move chips and can be more prone to chip packing in deep cuts. The upcut geometry also produces the cleanest finish on the bottom face of the workpiece.
Why does this bit have two bearings instead of one?
The double-bearing design - with one bearing at the tip and one near the shank - guides the bit along a template or pattern at two contact points simultaneously. This distributes the lateral pressure more evenly across the bit's length, reducing deflection and keeping the cutting edge parallel to the template edge throughout the full 2 in. cutting height. The result is a straighter, more accurate flush-trim edge compared to single-bearing designs, particularly on curved profiles and during production routing runs.
What shank size does this bit require, and is it compatible with CNC routers?
This bit uses a 1/2 in. shank and is compatible with any router collet or CNC spindle that accepts a 1/2 in. straight shank with right-hand rotation. That includes most CNC routing machines, router tables, and full-size handheld routers equipped with a 1/2 in. collet.
What materials can this solid carbide flush trim bit cut?
The super-micrograin solid carbide construction makes this bit suitable for routing solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic panels. The higher hardness of the super-micrograin carbide formulation helps the cutting edges stay sharp longer in abrasive materials like MDF and melamine compared to standard carbide grades.
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