Product Description
The CMT Bearing 1-1/4" - 8mm is a precision replacement bearing designed to restore smooth, accurate self-guiding performance to CMT router bits. Built from steel for lasting durability, this guide bearing is used on flush trim, pattern, rabbeting, and profile bits - keeping cuts precise and consistent by riding cleanly along templates or workpiece edges. Whether you are replacing a worn bearing or upgrading an existing bit, this component delivers the tight tolerances needed for reliable edge-following on a router or router table.
Key Features
- Steel construction - provides solid durability and resistance to the mechanical stress of high-speed router bit rotation, extending the working life of your bit setup.
- 1-1/4 in. outer diameter - matches the specified guide bearing size for compatible CMT router bits, ensuring proper fit and accurate edge-following without modification.
- 8mm bore diameter - sized to seat correctly on the bit shank or arbor, eliminating play and keeping the bearing running true during cuts.
- 7.94mm cutting depth - determines how much of the workpiece edge the bearing contacts, supporting consistent depth control across the full cut.
- 5mm plate thickness - contributes to the bearing's structural integrity and spacing, maintaining correct bit geometry once installed.
- Black shield orientation matters - the black shield must be kept right side up to correspond with bearing rotation during reassembly, ensuring the bearing runs properly and lasts as intended.
Why This Product
- A worn or failed guide bearing causes drift, chatter, and inaccurate cuts - this direct replacement bearing restores precise self-guiding performance so flush trim, pattern, and profile bits track cleanly along edges and templates again.
- With an 8mm bore and 1-1/4 in. outer diameter, this bearing is dimensionally matched to compatible CMT router bits, removing guesswork and the risk of using an incorrectly sized replacement that could damage the bit or workpiece.
- The steel body holds up to the continuous rotational loads and friction inherent in router bit guiding applications, making this a reliable long-term replacement rather than a short-term fix.
- Knowing that the black shield must be oriented correctly during reassembly - a detail that is easy to overlook - means you can reinstall this bearing with confidence and avoid premature failure from improper installation.
Specifications
- Manufacturer Part Number: 791.033.00
- Brand: CMT Orange Tools
- Product Type: Router Bit Bearing
- Diameter: 1-1/4 in.
- Bore Diameter: 8mm
- Cutting Depth: 7.94mm
- Plate Thickness: 5mm
- Material: Steel
Approved Applications
- Replacing worn or damaged guide bearings on CMT router bits
- Flush trim bit bearing replacement
- Pattern bit bearing replacement
- Rabbeting bit bearing replacement
- Profile bit bearing replacement
- Router and router table use
Frequently Asked Questions
What is the bore diameter of this bearing, and why does it matter?
The bore diameter is 8mm. This measurement must match the arbor or shank size of the router bit it is installed on. A correctly sized bore eliminates wobble and keeps the bearing centered, which directly affects cut accuracy and edge-following consistency.
Does the orientation of the black shield matter during installation?
Yes - it is important to keep the black shield right side up to correspond with the bearing's rotation direction during reassembly. Installing the shield upside down can cause the bearing to run incorrectly and may lead to premature wear or failure.
Which types of router bits is this bearing compatible with?
This bearing is used as a guide bearing on flush trim bits, pattern bits, rabbeting bits, and profile bits. It is a replacement and upgrade bearing for CMT router bits with matching dimensional requirements - a 1-1/4 in. outer diameter and 8mm bore.
What machines can I use this bearing with?
This guide bearing is intended for use with a handheld router or a router table setup. It functions as part of the router bit assembly rather than as a standalone cutting tool, so it operates wherever the compatible CMT router bit is used.
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