CMT Roundover Bit with Bearing - 1 1/8" Diameter, 5/16" Radius, 1/4" Shank is a precision-engineered edge-profiling router bit designed to produce smooth, consistent roundover profiles on wood, MDF, laminates, and a wide range of other materials. Built from fatigue-proof steel with carbide-tipped cutting edges, this 2-flute bit delivers repeatable results on handheld routers and router tables alike. The integrated ball bearing guides the bit along the workpiece edge, ensuring a uniform radius cut that softens sharp corners and creates professional furniture-grade edge profiles without the need for additional setup tools.

Key Features

• Carbide-Tipped Cutting Edges (HW Material): Industrial-grade carbide tips stay sharp longer than high-speed steel, reducing the frequency of replacements and maintaining clean, splinter-free cuts through hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic.
• Fatigue-Proof Steel Body: The bit shank and body are manufactured from fatigue-proof steel, meaning the tool resists flexing and stress fractures under repeated use - giving you a safer, more stable cut especially at higher feed rates.
• Integrated Ball Bearing Guide: The bearing pilots along the workpiece edge to control cutting depth automatically, eliminating the need for fences or edge guides and allowing freehand edge profiling with consistent results every pass.
• 5/16" Radius Profile: Produces a smooth, moderate roundover that works well on furniture edges, cabinet doors, and shelving, striking a practical balance between a subtle softening effect and a more pronounced decorative profile.
• 1/4" Shank Diameter: Compatible with the vast majority of handheld routers and compact router tables that accept 1/4" collets, making this bit highly versatile across a wide range of workshop setups.
• 2-Flute (2-Tooth) Design: Dual cutting edges improve cut quality and balance at operating speed, producing a smoother surface finish and reducing the need for sanding after routing.
• Right-Hand Rotation: Standard RH rotation is compatible with all conventional routers, requiring no special toolholding or modified setup.
• Bearing Washer Orientation: The black bearing washer must be kept right-side-up during reassembly to correspond with bearing rotation - this design detail prevents the bit from unscrewing during operation, adding an important layer of reliability and safety.

Why This Product

• Precise decorative edge detail in one pass: The 5/16" radius profile creates a clean, elegant roundover that transforms raw lumber edges into finished, furniture-quality surfaces without multiple passes or secondary profiling steps.
• Works across 13 selectable radii in the CMT roundover series: This bit is part of a coordinated family offering 13 different radius options, allowing woodworkers to match profiles consistently across projects or switch to a new radius without learning a different system.
• Engineered for safe, controlled cuts: The bearing guide controls depth of engagement automatically, and the fatigue-proof steel body with carbide-tipped edges minimizes the risk of unexpected bit failure during operation.
• Broadly compatible with laminates and composites: The carbide-tipped cutting edges handle laminates, melamine, and plastic cleanly, making this bit a practical choice for cabinet shops and countertop fabricators working with man-made panel products as well as solid wood.

Specifications

• Manufacturer Part Number: 838.285.11
• Brand: CMT Orange Tools
• Diameter: 1 1/8"
• Cutting Height: 1/2"
• Total Length: 2 1/8"
• Radius: 5/16"
• Shank: 1/4"
• Number of Teeth: 2
• Rotation: Right-Hand (RH)
• Material: HW (Carbide-Tipped)

Approved Applications

• Rounding over edges on solid hardwood and softwood
• Softening sharp corners on furniture, shelving, and cabinet components
• Edge profiling on plywood, MDF, chipboard, and melamine panels
• Decorative edge work on laminates and plastic sheet goods
• Handheld router profiling and router table edge work