Product Description
The CMT 990.004.00 Screw for Bearing - TSPEI M4 x 4 x 6mm with 8mm Diameter (UNI-5933) is a precision replacement fastener engineered by CMT to secure bearings on router bits and cutter heads. Conforming to the UNI-5933 standard, this TSPEI-type screw delivers reliable bearing retention, ensuring your cutting tools maintain accurate positioning and perform consistently during demanding woodworking operations. Having the correct replacement hardware on hand means less downtime when a bearing fastener needs to be swapped out, keeping your router bits and cutter heads running at peak performance.
Key Features
- TSPEI M4 x 4 x 6mm thread and body dimensions - matches the precise geometry required for CMT bearing assemblies, so the screw seats correctly without modification or guesswork
- 8mm head diameter - provides adequate clamping surface over the bearing race, preventing the fastener from pulling through and keeping the bearing firmly retained during high-speed cuts
- UNI-5933 standard compliance - guarantees dimensional accuracy and interchangeability with other UNI-5933 compliant hardware, making sourcing replacements straightforward
- Designed for use with CMT router bits and cutter heads (class RPRB) - engineered as a direct-fit replacement part, eliminating compatibility uncertainty and reducing time spent searching for the right fastener
- Active production status - this part remains in CMT's current lineup, meaning consistent availability for ongoing maintenance and repair needs
Why This Product
- When a bearing screw on a router bit or cutter head strips or is lost, having the correct CMT-spec TSPEI fastener restores the tool to factory condition rather than requiring a full bit replacement - saving cost and extending tool life
- The UNI-5933 standardized specification means this screw is dimensionally verified, not a generic approximation, so fit and function are predictable every time it is installed
- The M4 x 4 x 6mm body dimensions paired with the 8mm diameter head are specific to CMT's bearing retention design, making this the correct replacement for CMT router bit maintenance rather than a cross-category substitute
- As an active CMT part number (RPRB class replacement), it fits into a professional maintenance workflow - keeping the right hardware stocked means CMT router bits and cutter heads can be serviced quickly without halting production
Specifications
- Manufacturer Part Number: 990.004.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING TSPEI M4x4x6mm D=8mm UNI-5933
- Thread Size: M4
- Small Diameter: M4x3.7x6mm
- Head Diameter: 8mm
- Screw Type: TSPEI
- Standard: UNI-5933
- Product Class: RPRB
- Status: Active
Frequently Asked Questions
What is this screw used for?
This TSPEI M4 x 4 x 6mm screw is used to retain bearings on CMT router bits and cutter heads. It is a replacement fastener in the RPRB (replacement part for router bits) product class, intended to restore bearing assemblies to proper working condition.
What does the UNI-5933 designation mean for this fastener?
UNI-5933 is an Italian national standard that defines the dimensional and geometric requirements for this type of screw. Conformance to UNI-5933 ensures the fastener meets consistent specifications, so it fits correctly in CMT bearing assemblies without modification.
What is the difference between the M4 x 4 x 6mm nominal description and the M4 x 3.7 x 6mm small diameter value?
The nominal thread designation (M4) describes the major thread diameter, while the small diameter value of M4x3.7x6mm refers to the minor (root) diameter of the thread. Both measurements describe the same fastener - the small diameter is the precise root measurement used for technical fit verification in bearing assemblies.
Is this screw still in active production?
Yes. The CMT 990.004.00 carries an active status in CMT's product line, confirming it is a currently produced part and not a discontinued or legacy item.
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