CMT Solid Carbide Upcut Spiral Flush Trim Bit - 1/2" Diameter, Double Bearing by CMT is a precision-ground routing tool engineered for flush trimming operations that demand clean chip evacuation and consistent edge quality. Built from a special super-micrograin carbide formulation, this upcut spiral flush trim bit delivers superior hardness and a higher transverse rupture point compared to standard carbide grades - making it a reliable choice for production routing, CNC applications, and handheld trimming work alike. The double-bearing design ensures the bit tracks a template or guide surface with stability from both ends, reducing deflection and keeping the cut true across the full 1 1/4" cutting height.

Key Features

• Upcut Spiral Geometry - ejects chips upward and out of the cut zone, preventing chip buildup in deep slots and pockets and promoting a cleaner, cooler cutting action on every pass.
• Double-Bearing Configuration - provides contact points above and below the cutter body, stabilizing the bit against the template and reducing vibration for more consistent flush trim results.
• Super-Micrograin Solid Carbide Construction - CMT's special micrograin carbide formulation increases hardness and raises the transverse rupture point, meaning the cutting edges stay sharp longer and the bit can withstand more resharpenings before replacement.
• 2-Flute Design - balances aggressive material removal with a smooth cutting action, reducing heat buildup and improving surface quality on the bottom face of the cut.
• 1/2" Shank Diameter - provides a secure, low-runout fit in 1/2" collets used in router tables, CNC routing machines, and handheld routers, maximizing stability at routing speeds.
• Right-Hand (RH) Rotation - compatible with the standard spindle direction of most production and hobby routers, ensuring correct chip ejection direction without any special setup.

Why This Product

• The upcut spiral action combined with a 1 1/4" cutting height makes this bit well suited for through-cuts in thicker stock where chip evacuation is critical - reducing heat and keeping the cut path clear without repeated passes.
• The double-bearing design solves a common flush trim challenge: single-bearing bits can deflect or tip under side load. Having bearings at two contact points distributes that load and keeps the cutter parallel to the template face across the full depth.
• CMT's super-micrograin carbide formulation is specifically engineered for increased hardness and rupture resistance - meaning the tool holds an edge through demanding materials like hardwood, plywood, laminates, and plastic rather than chipping prematurely.
• The 1/2" shank diameter and 3 1/2" total length give this bit the reach needed for flush trimming solid hardwood, MDF, melamine, and chipboard panels on a router table or in CNC production environments without sacrificing rigidity.

Specifications

• Manufacturer Part Number: 191.505.11B
• Brand: CMT Orange Tools
• Diameter: 1/2"
• Cutting Height: 1 1/4"
• Total Length: 3 1/2"
• Shank Diameter: 1/2"
• Number of Flutes: 2
• Rotation: Right-Hand (RH)
• Material: Solid Carbide (Super-Micrograin Formulation)
• Product Type: Upcut Spiral Flush Trim Router Bit with Double Bearing

Approved Applications

• Flush trimming solid hardwood panels and components
• Template routing and pattern trimming in softwood and plywood
• Through-cuts in MDF, chipboard, and melamine
• Deep pocket and slot routing with chip evacuation requirements
• Flush trimming laminates and plastic sheet materials
• CNC routing production runs requiring consistent edge quality
• Router table trimming operations
• Handheld router flush trim work with template guides