Product Description
CMT Roundover Bit with Bearing - 1 1/4" Diameter, 3/8" Radius, 1/4" Shank is a precision carbide-tipped router bit designed to produce smooth, consistent roundover profiles on wood edges and workpiece corners. Engineered from fatigue-proof steel with a 2-flute cutting configuration, this CMT bit delivers clean, repeatable edge profiles whether you are profiling furniture components, softening sharp corners on hardwood panels, or finishing decorative trim work. The integrated ball-bearing guide pilots along the workpiece edge to maintain a uniform depth of cut throughout every pass.
Key Features
- 3/8" Radius Roundover Profile - produces a smooth, consistent curved edge that eliminates sharp corners and gives furniture and millwork a refined, finished appearance.
- Carbide-Tipped Cutting Edges (HW Material Grade) - industrial-grade carbide tips stay sharp longer than standard high-speed steel, reducing the frequency of replacements and maintaining cut quality across demanding materials including hardwood, softwood, plywood, and MDF.
- Fatigue-Proof Steel Body - the bit body is manufactured from fatigue-proof steel, resisting stress cracking and deformation during high-cycle router table use, extending the working life of the tool.
- Integrated Ball-Bearing Guide - the bearing pilots smoothly against the workpiece edge, controlling lateral positioning automatically so you achieve a consistent profile depth without a fence on a handheld router.
- 1/2" Bearing Diameter - the standard 1/2" bearing diameter on this 3/8" radius bit is sized to deliver the correct profile geometry and is compatible with router table setups as well as handheld routing.
- 2-Flute (2-Tooth) Design - dual cutting edges distribute load evenly across each pass, contributing to a smoother surface finish and reduced tear-out on both hardwoods and softer materials.
- Right-Hand Rotation - matches the standard rotation direction of nearly all handheld routers and router tables, ensuring correct feed direction and safe, predictable cutting behavior.
- 1/4" Shank - fits the 1/4" collet found on a wide range of compact routers and trim routers, broadening compatibility with common workshop equipment.
- Black Bearing Washer - Correct Orientation Required - the bearing washer must be kept right side up to correspond with bearing rotation during reassembly; proper reassembly prevents the bit from unscrewing during use, which is a critical safety consideration.
Why This Product
- With 13 different radii available in the CMT roundover series, this 3/8" radius bit slots into a broad system of profile options - making it a practical choice for woodworkers who want a consistent carbide-tipped solution across multiple edge profiles using the same tool platform.
- The fatigue-proof steel body combined with carbide-tipped cutting edges means this bit is built to handle repeated passes through hardwood, plywood, MDF, and composite materials without rapid wear - reducing downtime and tool replacement costs in production or shop environments.
- The integrated bearing guide eliminates the need for a router fence when using a handheld router, making this bit highly versatile for on-site or shop work where a router table may not always be available.
- At a 2 1/4" total length with a 5/8" cutting height, the bit provides sufficient reach for typical furniture edge profiling and trim work while remaining compact enough for controlled, accurate cuts on smaller workpieces.
Specifications
- Manufacturer Part Number: 838.317.11
- Brand: CMT Orange Tools
- Product Type: Roundover Bit with Bearing
- Diameter: 1 1/4"
- Cutting Height: 5/8"
- Total Length: 2 1/4"
- Radius: 3/8"
- Shank Diameter: 1/4"
- Number of Teeth: 2
- Rotation: Right-Hand (RH)
- Blade Material: HW (Carbide-Tipped)
Approved Applications
- Rounding over edges on solid hardwood and softwood boards
- Softening sharp corners on furniture panels and cabinet doors
- Edge profiling on plywood, MDF, chipboard, and melamine
- Decorative trim work and millwork edge finishing
- Finishing laminates and plastic sheet edges
- Use with handheld routers equipped with a 1/4" collet
- Use with router tables
Frequently Asked Questions
Can this bit be used in a handheld router or does it require a router table?
This bit is suitable for use with a handheld router equipped with a 1/4" collet as well as a router table. Note that CMT roundover bits with radii from 1" to 1 1/2" are intended for router table use only - this 3/8" radius model does not fall under that restriction.
What is the bearing diameter on this roundover bit?
All CMT roundover bits with radii up to a certain size use a 1/2" bearing diameter, and this 3/8" radius model follows that standard, using a 1/2" bearing diameter. This bearing rides against the workpiece edge to guide the cut.
Is there anything important to know when reassembling the bearing?
Yes - the black bearing washer must be kept right side up to correspond with the direction of bearing rotation during reassembly. Improper reassembly can cause the bit to unscrew during use, which is a safety hazard. Always verify correct washer orientation before using the bit.
What materials can this roundover bit cut?
The carbide-tipped cutting edges and fatigue-proof steel body make this bit suitable for solid hardwood, softwood, plywood, MDF, chipboard, melamine, laminates, and plastic. The dual-flute design helps produce smooth results across all of these material types.
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