CMT 980.531.11 Rounding Over Router Bit for Hard Materials with Bearing, Radius 8 mm, Diameter 25.4 mm, Working Length 22.2 mm, Shank 12 mm

The CMT 980.531.11 Rounding Over Router Bit is a professional-grade cutting tool engineered specifically for shaping and rounding edges in hard materials. Featuring robust carbide tips and an integrated bearing for smooth guidance, this router bit ensures clean, precise finishes on demanding woodworking projects. With a cutting radius of 8 mm, a diameter of 25.4 mm, a working length of 22.2 mm, and a sturdy 12 mm shank, it provides excellent stability and performance for professional workshops and advanced fabrication tasks.

Advantages

This rounding over router bit delivers exceptional durability and wear resistance thanks to its high-quality carbide construction, making it highly reliable for continuous work on dense hardwoods and abrasive composite materials. The inclusion of a radius guide bearing allows for precise, template-free edge profiling directly against the workpiece, ensuring consistent results with minimal sanding required. The balanced 12 mm shank minimizes vibration during high-speed operation, enhancing overall control and extending the lifespan of both the bit and the router.

Suitable for

• Edge rounding and profiling on hardwood furniture components
• Creating decorative edges on solid wood panels and tabletops
• Cabinet making and architectural millwork involving dense materials
• Precision routing tasks in professional carpentry workshops

When it may not be suitable

This router bit is not recommended for use with lightweight handheld routers that do not support a 12 mm shank capacity. It is also generally unsuited for very soft woods or delicate plastics where an aggressive carbide profile might cause splintering or material tear-out.

Key specifications

• Cutting radius: 8 mm
• Tool diameter: 25.4 mm
• Working length: 22.2 mm
• Shank diameter: 12 mm
• Carbide-tipped cutting edges
• Integrated guide bearing

How to use

Securely insert the 12 mm shank into the collet of a compatible router, ensuring it is tightened to the manufacturer's recommended torque specifications. Adjust the router depth and fence or bearing position to align with the edge of your workpiece. Feed the material slowly and steadily against the direction of the bit rotation to maintain clean cuts and prevent burning. Always wear appropriate personal protective equipment, including safety glasses and ear protection, during operation.

What to consider before purchase

• Verify that your router collet is compatible with a 12 mm shank size
• Check the dimensions to ensure the 8 mm radius matches your project requirements
• Assess the hardness of your materials to ensure compatibility with heavy-duty carbide bits
• Ensure your router has sufficient power to handle profiling in dense materials safely

Usage recommendations

Always inspect the router bit for debris or wear before each use, and clean the carbide edges and bearing regularly to maintain optimal performance and safety. Operate the tool within recommended speed limits to prevent overheating and to prolong the life of the cutting edges.