The CMT 838.991.11 Roundover Bit with Bearing is a premium carbide-tipped router bit designed to produce smooth, consistent 7/8" radius roundover profiles on solid hardwood, softwood, plywood, MDF, and a wide range of composite and sheet materials. Built on a sturdy 1/2" shank and featuring a 2 1/4" cutting diameter with a 1 1/8" cutting height, this large-radius edge profiling bit is engineered specifically for router table use, where it delivers repeatable, professional-grade results on furniture edges, cabinetry panels, and decorative millwork. The integrated ball-bearing guide pilots smoothly along the workpiece face, ensuring a uniform depth of cut and clean edge profile pass after pass.

Key Features

• 7/8" Roundover Radius - Large-Profile Edge Shaping: Produces a generous 7/8" radius roundover in a single pass, ideal for furniture edges and decorative profiles where a bold, smooth curve is required.
• 2-Flute HW Carbide-Tipped Cutting Edges: Hard metal (HW) carbide tips deliver clean, splinter-free cuts across hardwood, softwood, MDF, plywood, chipboard, laminates, melamine, and plastic - reducing tearout and extending service life between sharpenings.
• Fatigue-Proof Steel Body: The bit body is constructed from fatigue-proof steel, which resists stress fractures under the high rotational forces typical of large-diameter router bits, contributing to safer and longer operation.
• 3/4" Diameter Ball-Bearing Guide: This bit radius falls within the group that uses a 3/4" bearing diameter, which provides stable, friction-free piloting along the workpiece edge for a consistent cut depth without burning or marring the stock.
• Right-Hand Rotation: Configured for standard right-hand (RH) rotation, compatible with virtually all fixed-base, plunge, and router table setups using a 1/2" collet.
• 1/2" Shank for Maximum Rigidity: The full 1/2" shank minimizes vibration and deflection during heavy cuts, producing smoother surface finishes and reducing chatter marks on long edge profiles.
• Bearing Washer Orientation Matters: The black bearing washer must be kept right side up during reassembly to match bearing rotation direction - proper reassembly prevents the bit from unscrewing during use, an important safety detail on this style of bearing-guided bit.

Why This Product

• Purpose-Built for Router Table Use: Bits with radii from 1" to 1 1/2" are intended for router table operation only - the 838.991.11 is properly sized and designed for that controlled environment, giving woodworkers confidence that they are using the bit in its correct and safe application.
• Broad Material Compatibility: Whether working with solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, or plastic, this roundover bit handles the full range of materials commonly used in furniture and cabinet production - making it a versatile single bit for a wide shop environment.
• 13-Radius CMT System with Consistent Bearing Standards: CMT's roundover bit lineup offers 13 different radii, and understanding which bearing diameter corresponds to which radius (this bit uses a 3/4" bearing) ensures correct spare-part selection and reassembly - supporting long-term tool investment and easy maintenance.
• 2-Flute Design Balances Cut Quality and Feed Rate: Two carbide-tipped flutes provide a smooth, balanced cut that is well-suited to the slower, controlled feed rates typical of router table profiling work, reducing the risk of burning on dense hardwoods.

Specifications

• Manufacturer Part Number: 838.991.11
• Brand: CMT Orange Tools
• Cutting Diameter: 2 1/4"
• Cutting Height: 1 1/8"
• Radius: 7/8"
• Shank Diameter: 1/2"
• Total Length: 3 3/32"
• Number of Flutes: 2
• Rotation: Right-Hand (RH)
• Blade Material: Hard Metal (HW) Carbide-Tipped
• Bearing Diameter: 3/4"

Approved Applications

• Rounding over furniture edges and panel faces
• Softening sharp corners on cabinetry and millwork
• Decorative edge profiling on solid hardwood and softwood
• Edge shaping on plywood, MDF, chipboard, melamine, and laminates
• Profiling plastic workpieces on a router table