Verified Dual-Unit Fit
Designed for compatible 1/2-inch (12.7 mm) guide-bearing applications.


CMT 990.423.00 is a separately sold replacement shield for a 1/2-inch (12.7 mm) guide bearing. It helps limit wood-shaving and debris entry around compatible bearing assemblies, including CMT bearing 791.003.00.
A separately supplied protective shield sized for compatible 1/2-inch (12.7 mm) guide bearings. It is a spare component, not a complete bearing assembly.
Verified for CMT 1/2-inch (12.7 mm) bearing applications and identified by distributors for bearing 791.003.00. Confirm the exact host-tool parts list, bearing code, fastener stack, clearances, and assembly order before installation.
CMT 990.423.00 is the exact replacement shield for compatible 1/2-inch (12.7 mm) guide-bearing assemblies. The shield helps protect the bearing area from wood shavings and machining debris that can interfere with bearing movement.
This SKU identifies the shield only. The 1/2-inch (12.7 mm) bearing, router bit, screw, washers, and any other mounting components are not represented as included.
CMT bearing 791.003.00 is a verified compatibility reference for this shield. Final selection must still be based on the exact CMT host-tool drawing or spare-parts list because bearing diameter alone does not establish the complete assembly fit.
Technical Specifications
Designed for compatible 1/2-inch (12.7 mm) guide-bearing applications.
Helps prevent wood shavings and machining debris from entering the bearing area.
SKU 990.423.00 identifies the shield alone for controlled replacement selection.
Confirm exact Item Code 990.423.00 and the complete host-tool parts list before installation. The bearing and other assembly parts are not included. Disconnect and isolate the machine, inspect the bearing and mounting hardware, preserve the specified component order and clearances, and replace any worn or damaged parts before returning the tool to service.
CMT 990.423.00 provides the verified shield format for compatible 1/2-inch (12.7 mm) guide-bearing assemblies, including bearing reference 791.003.00.
Correct Item Code selection, component order, bearing condition, fastening, and clearance checks are essential to a reliable repair.