Product Description
The CMT 990.116.00 TSPEI Screw for Bearing - M6x8.7x12mm - UNI-5933 is a precision replacement screw engineered specifically for use with CMT bearing assemblies on router bit and cutter head chuck systems. Conforming to the UNI-5933 standard, this TSPEI-style fastener delivers a secure, correctly dimensioned fit for the CMT 183.410, 183.420, and 183.421 CNC chucks - keeping critical bearing components firmly in place during demanding routing and machining operations. When a worn or missing bearing screw compromises your tool's performance, having the exact OEM-spec replacement on hand gets your setup back to full working order without guesswork.
Key Features
- TSPEI screw design - M6x8.7x12mm with 12mm head diameter (D12) - precisely matches the original fastener geometry on CMT 183-series chucks, ensuring a flush, secure fit without modification or improvisation.
- Conforms to UNI-5933 standard - this internationally recognized specification means dimensional accuracy and thread consistency you can rely on when reassembling bearing components.
- Designated for CMT 183.410, 183.420, and 183.421 chuck models - eliminates compatibility guesswork and ensures the screw seats correctly in the bearing housing as originally designed.
- CMT replacement part (Class: RPRC) - sourced as a genuine CMT component, so the fit, thread pitch, and material properties match what the tool was built with from the factory.
Why This Product
- Bearing screws in CNC chuck assemblies are small but critical - a loose or stripped fastener can cause bearing play, vibration, or tool runout. This exact-spec replacement restores the integrity of your 183.410, 183.420, or 183.421 chuck without the need to replace the entire assembly.
- The UNI-5933 standard designation provides confidence that the thread form and screw geometry are held to a defined specification - not a generic substitute that might fit imperfectly or back out under vibration.
- With the TSPEI M6x8.7x12mm profile and D12 head diameter matched to the original design, installation is straightforward and does not require re-tapping or reworking the existing bore.
- Keeping a spare bearing screw on hand means a minor hardware issue does not sideline a router bit or cutter head - minimizing downtime on the shop floor or production line.
Specifications
- Manufacturer Part Number: 990.116.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING TSPEI M6x8.7x12mm UNI-5933 (for 183.410/420/421)
- Screw Type: TSPEI
- Thread Size and Dimensions: M6x8.7x12mm
- Head Diameter: D12
- Standard: UNI-5933
- Compatible Models: CMT 183.410, 183.420, 183.421
- Product Class: RPRC (Replacement Part - Router Chuck Component)
- Status: Active
Frequently Asked Questions
Which CMT chuck models is this screw compatible with?
This screw is specifically designed for use with CMT CNC chuck models 183.410, 183.420, and 183.421. It is not a universal fastener - it is engineered to the bearing housing dimensions of these three specific chuck models.
What does the designation M6x8.7x12mm refer to on this screw?
The designation describes the screw's key dimensions: M6 refers to the metric thread size, 8.7mm refers to the shank or grip length, and 12mm corresponds to the head diameter (D12). Together these dimensions define the exact profile needed for proper fit in the CMT 183-series bearing assembly.
What is the UNI-5933 standard and why does it matter?
UNI-5933 is an Italian national standard that defines the dimensional and geometric requirements for this type of screw. Conformance to this standard ensures that the thread pitch, tolerances, and overall geometry are held to a defined specification - important for a bearing fastener where precise fit directly affects tool performance and safety.
Is this screw a genuine CMT replacement part?
Yes. The 990.116.00 is an active CMT replacement part (product class RPRC), supplied to maintain the original specification of the bearing assembly on compatible CMT 183-series chucks.
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