Product Description
CMT Screw for Bearing - TCEI M3x6x9mm (Diameter: 5.5mm, UNI-5931) is a precision replacement fastener from CMT, engineered to secure bearings on router bits and cutter heads that use M3 TCEI socket cap screws. Keeping the correct bearing retention screw on hand means less downtime when a fastener is lost or worn, and it ensures your routing tools continue to perform as intended with a properly matched, specification-correct component.
Key Features
- TCEI socket cap head design (UNI-5931 standard) - the recessed hex drive allows for precise torque application in tight spaces around bearing seats, reducing the risk of cam-out or tool slippage during installation.
- M3x6x9mm thread and body dimensions - matches the exact OEM specification for CMT router bits and cutter heads that require M3 TCEI fasteners, ensuring a secure, wobble-free bearing fit without modification.
- 5.5mm head diameter - the correctly sized head bears squarely against the bearing retaining surface, distributing clamping load evenly and protecting the bearing from damage caused by an undersized or oversized fastener.
- Manufactured to UNI-5931 standard - compliance with this recognized fastener standard means consistent thread pitch, head geometry, and material quality, so the screw installs and performs reliably every time.
- CMT genuine replacement part (Class: RPRB) - sourced as an authentic CMT spare, this screw is the factory-correct choice for bearing repair and maintenance on compatible CMT tooling, avoiding compatibility guesswork.
Why This Product
- When a bearing retention screw is lost or stripped on a CMT router bit, using this exact TCEI M3x6x9mm replacement restores the tool to its original configuration without the need to replace the entire bit or cutter head.
- The UNI-5931 standardized geometry ensures the fastener seats fully and holds the bearing securely under the rotational stresses of router and cutter head operation.
- Stocking this genuine CMT spare part eliminates production delays caused by sourcing a generic substitute that may not match the required M3 TCEI head diameter of 5.5mm or the 9mm bearing seat dimension.
- As an active CMT replacement part (MPN: 990.051.00), this screw is purpose-built for the RPRB class of CMT spare components, giving maintenance professionals confidence they are ordering the correct bearing hardware for the job.
Specifications
- Manufacturer Part Number: 990.051.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING TCEI M3x6x9mm D=5.5mm UNI-5931
- Thread Size: M3x6x9mm
- Head Diameter: 5.5mm
- Head Type: TCEI (Socket Cap, UNI-5931)
- Product Class: RPRB
- Status: Active
Frequently Asked Questions
What does TCEI mean and what tool is needed to drive this screw?
TCEI refers to the Italian designation for a socket cap head screw with an internal hex (Allen) drive, conforming to the UNI-5931 standard. An appropriately sized hex key or Allen wrench is used to install or remove this M3 screw. Always use the correct size hex key to avoid rounding the drive socket.
Which CMT tools use the TCEI M3x6x9mm bearing screw?
This screw is intended for CMT router bits and cutter heads that use M3 TCEI bearing retention fasteners. It is classified under CMT's RPRB spare parts category. If you are unsure whether your CMT tool uses this specific fastener, compare the thread size (M3), overall length (9mm), and head diameter (5.5mm) against the original screw from your tool.
What does the 9mm dimension refer to in the M3x6x9mm designation?
In the designation M3x6x9mm, M3 indicates the metric thread diameter, x6 refers to the thread pitch or thread length, and x9mm describes the overall body or grip length of the screw. Together these three dimensions define the screw's fit within the bearing seat of compatible CMT tooling.
Can this screw be used as a general-purpose M3 fastener for non-CMT applications?
While this is a standard UNI-5931 TCEI M3 socket cap screw, it is specifically catalogued and sized as a bearing retention fastener for CMT router bits and cutter heads. Its 5.5mm head diameter and 9mm length are matched to that application. Verify that both the thread and head dimensions suit your specific need before using it in any other context.
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