The CMT 838.187.11 Roundover Bit with Bearing is a precision carbide-tipped router bit designed to produce a clean, consistent 1/8" radius roundover profile on wood and composite materials. Built on a 1/4" shank with a 47/64" cutting diameter and a 1/2" cutting height, this bit is an ideal choice for softening sharp edges, creating decorative profiles on furniture, and finishing solid hardwood, plywood, MDF, and laminates. The integrated ball-bearing guide pilots smoothly along the workpiece edge, ensuring repeatable depth and a polished result on every pass. Made from fatigue-proof steel with carbide-tipped cutting edges, the CMT 838.187.11 delivers long-lasting performance for both handheld router use and router table setups.

Key Features

• 1/8" Radius Roundover Profile - produces a delicate, decorative inset at the base of the cut, giving woodworkers an extra decorative edge option beyond a simple roundover.
• Integrated Ball-Bearing Guide - pilots along the workpiece edge to maintain a consistent cutting depth on every pass, reducing the need for secondary adjustments or jigs.
• Carbide-Tipped Cutting Edges (HW) - industrial-grade carbide tips resist dulling far longer than high-speed steel, making this bit well-suited for repeated cuts in hardwood, softwood, plywood, MDF, and laminates.
• Fatigue-Proof Steel Body - the bit body is engineered to resist stress fractures and deformation under sustained routing loads, reducing the risk of material failure and extending service life.
• 2-Flute (2-Tooth) Design - two cutting edges distribute heat and load evenly during the cut, contributing to a smoother finished surface and longer edge retention.
• 1/4" Shank - fits a wide range of standard handheld routers and router tables, making this bit highly versatile across common workshop setups.
• Right-Hand Rotation - compatible with the standard rotation direction of virtually all routers sold for the North American market, ensuring safe and predictable operation.
• Black Bearing Washer with Correct Orientation - the bearing assembly must be kept right side up during reassembly to match bearing rotation, preventing the bit from unscrewing during use - an important safety detail built into the CMT design.

Why This Product

• Decorative versatility in a compact radius - the 1/8" radius is one of 13 radius options available across the CMT roundover bit range. This smaller radius creates a subtle, refined edge profile that works especially well on furniture edges, trim work, and detail cuts where an aggressive roundover would look out of place.
• Consistent results on laminates and finished panels - CMT specifically recommends small-radius roundover bits for finishing laminates, noting that the profile virtually eliminates the hand-filing step typically required when using conventional laminate trim bits. This translates to faster finishing and cleaner edges on laminate-covered panels.
• Built for long-term reliability - the combination of fatigue-proof steel, carbide-tipped edges, and a 2-flute geometry means this bit holds up through repeated use on hardwoods and composites without premature dulling or structural failure.
• Safe, predictable bearing-guided cutting - the included bearing guide eliminates guesswork when profiling edges freehand or on a router table, keeping the cut consistent even when working with irregular grain patterns or varying workpiece thicknesses.

Specifications

• Manufacturer Part Number: 838.187.11
• Brand: CMT Orange Tools
• Diameter: 47/64"
• Cutting Height: 1/2"
• Total Length: 2-3/32"
• Radius: 5/64"
• Shank: 1/4"
• Number of Teeth: 2
• Rotation: Right-Hand (RH)
• Material: Carbide-Tipped (HW)

Approved Applications

• Rounding over edges on solid hardwood and softwood
• Softening sharp corners on furniture and cabinetry
• Edge profiling on plywood, MDF, chipboard, and melamine panels
• Finishing laminate edges - virtually eliminates the filing step needed with conventional trim bits
• Decorative edge work on trim and millwork