Product Description
The CMT Screw for Bearing - Torx T20 TBTI M4 x 5.5 x 8mm is a genuine CMT replacement fastener engineered to secure bearings on CMT router bits and cutter heads that use the T20 Torx drive system. Having the correct replacement screw on hand means less downtime at the bench and a confident, secure fit every time a bearing needs to be serviced or swapped out. This precision-threaded M4 fastener keeps critical bearing assemblies locked in place during routing operations, helping maintain accuracy and safe tool performance across a wide range of profiles and cuts.
Key Features
- Torx T20 drive - allows high torque transfer during tightening with reduced risk of cam-out, so the screw seats firmly without damaging the head
- TBTI socket head style - provides a low-profile, countersunk-compatible fit that keeps the fastener flush and out of the cutting path
- M4 x 5.5 x 8mm thread specification - matches the exact factory dimensions required for CMT bearing-mounted router bits and cutter heads, ensuring a precise, wobble-free fit
- Genuine CMT replacement part (MPN: 990.094.00) - sourced directly from the original manufacturer, so you get the same quality fastener installed at the factory rather than a generic substitute that may not fit correctly
- RPHK class hardware designation - confirms this is a purpose-built replacement and hardware component designed to CMT's own internal standards for router bit assembly
Why This Product
- When a bearing screw strips or goes missing, the entire bit becomes unsafe to use - this genuine CMT replacement restores the tool to full working condition with an exact-fit fastener that meets the original assembly specification
- The T20 Torx drive format gives you a more reliable grip with a standard T20 driver, reducing the chance of rounding out the fastener head compared to hex or Phillips alternatives
- Using the correct M4 x 5.5 x 8mm thread size means no risk of cross-threading or under-torquing that can lead to bearing movement during a cut - protecting both the workpiece and the operator
- Keeping a genuine CMT bearing screw in your spare-parts kit extends the service life of your existing CMT router bits and cutter heads without needing to replace the entire bit assembly
Specifications
- Brand: CMT Orange Tools
- Model Number: 990.094.00
- Description: SCREW FOR BEARING TORX T20 TBTI M4x5.5x8mm
- Drive Type: Torx T20
- Head Style: TBTI
- Thread Size: M4 x 5.5 x 8mm
- Product Class: RPHK
Frequently Asked Questions
What CMT tools is this screw compatible with?
This screw is designed for use with CMT router bits and cutter heads that use the T20 Torx screw to retain the bearing. If your CMT bit uses a T20 Torx drive fastener on the bearing seat, this M4 x 5.5 x 8mm replacement is the correct part to use.
What driver do I need to install this screw?
You will need a Torx T20 driver or T20 bit to properly install and tighten this screw. Using the correct T20 driver ensures full engagement with the fastener head and reduces the risk of stripping.
Why is it important to use the exact M4 x 5.5 x 8mm specification rather than a similar-sized screw?
The thread pitch, diameter, and length must match the tapped hole in the router bit body precisely. Using a fastener with the wrong dimensions can result in cross-threading, insecure bearing retention, or damage to the tool body - all of which compromise both cutting accuracy and safe operation.
Is this a genuine CMT replacement part or an aftermarket fastener?
This is a genuine CMT replacement part carrying CMT's own part number 990.094.00. It is manufactured to the same specification as the screw originally used in CMT router bit and cutter head assemblies, ensuring a proper fit without modification.
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