Product Description
CMT Solid Carbide Upcut Spiral Flush Trim Bit - 1/4" Diameter, 1/4" Shank, RH is a precision flush trimming router bit built from solid micrograin carbide and designed for clean, efficient cuts in solid hardwood, softwood, plywood, MDF, laminates, melamine, plastic, and chipboard. The upcut spiral geometry actively pulls chips upward out of the cut, making this double-bearing bit an ideal choice for through-cuts, deep pockets, and CNC routing applications where chip evacuation is critical. Whether mounted in a router table, handheld router, or CNC routing machine, this right-hand rotation cutter delivers a clean finish on the lower face of the workpiece.
Key Features
- Solid Carbide Construction (HWM Micrograin Carbide) - manufactured entirely from premium super-micrograin carbide, this bit offers superior wear resistance and durability compared to carbide-tipped alternatives, allowing more resharpenings over the life of the tool and reducing long-term tooling costs.
- Upcut Spiral Geometry - the upcut flute design ejects chips upward and out of the cut zone, keeping the kerf clear during deep slots, through-cuts, and pocket routing for consistent cut quality and reduced heat buildup at the cutting edge.
- Double-Bearing Flush Trim Design - two guide bearings provide stable registration against the template or workpiece edge, minimizing chatter and deflection for accurate, repeatable flush trimming results.
- 2-Flute Cutting Configuration - the two-tooth spiral design balances cutting speed and surface quality, producing a clean finish on the bottom face of the workpiece across a wide range of compatible materials.
- CMT Orange Shield Non-Stick Coating - helps prevent the bit from overheating, reduces pitch and resin buildup on the cutting surfaces, and protects against corrosion, extending tool service life in demanding production environments.
- 1/4" Shank Compatibility - the 1/4" shank fits a wide range of routers, router tables, and CNC collets, giving this bit broad machine compatibility for both professional and workshop use.
Why This Product
- For flush trimming applications in hardwood, MDF, plywood, and laminates, the double-bearing guidance system keeps cuts tracking true to the template edge - reducing the risk of overcutting or drift that single-bearing bits can allow.
- The upcut spiral flute design actively clears chips out of deep cuts rather than packing them into the kerf, making this bit a strong choice for through-cuts and deep pocket routing where chip clogging can degrade finish quality and overheat the tool.
- With a 1" cutting height and 3" total length on a compact 1/4" shank, this bit covers the geometry needed for flush trimming tasks on CNC routing machines and handheld routers without requiring a larger collet size or a longer, less-rigid setup.
- Solid micrograin carbide construction means the cutting edges hold their sharpness through more material passes than carbide-tipped bits, reducing downtime for bit changes in high-volume routing or CNC production work.
Specifications
- Manufacturer Part Number: 191.008.11B
- Brand: CMT Orange Tools
- Diameter: 1/4"
- Cutting Height: 1"
- Total Length: 3"
- Shank: 1/4"
- Number of Teeth: 2
- Rotation: Right-hand (RH)
- Blade Material: Solid Carbide (HWM Micrograin)
- Product Type: Upcut Spiral Flush Trim Router Bit with Double Bearing
Approved Applications
- CNC Routing
- Flush Trimming
- Through-Cuts
- Deep Pocket Routing
- Chip Evacuation Routing
- Template-Guided Trimming
Frequently Asked Questions
What machines is this flush trim bit compatible with?
This bit is compatible with CNC routing machines, router tables, and handheld routers that accept a 1/4" collet. The 1/4" shank fits a wide range of standard router setups in both professional and workshop environments.
Why does this bit use an upcut spiral instead of a straight or downcut design?
The upcut spiral geometry evacuates chips upward and out of the cutting zone during the pass. This is especially beneficial for through-cuts and deep pocket routing, where chip accumulation can cause heat buildup and degrade the surface finish. The upcut design also produces the cleanest finish on the lower face of the workpiece.
What is the purpose of having two bearings on this flush trim bit?
The double-bearing configuration provides stable, consistent contact with the template or workpiece edge throughout the cut. Two bearings reduce deflection and chatter compared to a single-bearing setup, which translates to more accurate, repeatable flush trimming results - particularly important on longer cuts or when working with curved templates.
What materials can this spiral flush trim bit cut?
This bit is suited for use in solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic. The solid micrograin carbide construction maintains cutting edge sharpness across this range of materials, including harder or more abrasive sheet goods like MDF and melamine.
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