Product Description
The CMT 990.005.00 Screw for Bearing - STEI Conical M3 x 3mm (UNI-5929) is a precision replacement fastener designed to secure bearings on CMT router bits and cutter heads. This conical set screw follows the UNI-5929 standard, delivering a reliable, interference-resistant fit that keeps bearings firmly in place during routing operations. Keeping the correct bearing retention hardware on hand means less downtime and consistent performance across your CMT tooling lineup.
Key Features
- M3 x 3mm conical thread profile - matches the precise thread specification required for proper bearing retention on compatible CMT router bits, ensuring a secure and accurate fit without play or wobble.
- UNI-5929 standard compliance - conforms to an established Italian industrial fastener standard, so you can trust dimensional consistency and interchangeability with CMT replacement parts.
- STEI conical screw design - the tapered conical geometry locks against the bearing seat firmly, reducing the risk of loosening under the vibration and torque loads typical of routing applications.
- Compact M3 x 3mm size - purpose-built for small-diameter bearing retention applications, making it the right choice when working with precision CMT tooling that requires exact fastener sizing.
Why This Product
- Restores proper bearing function on CMT router bits that use M3 retention screws - a worn or missing bearing screw can cause bearing migration, vibration, and premature tool failure, and this exact-spec replacement addresses that directly.
- UNI-5929 standardization means the screw is dimensionally consistent and predictable, eliminating guesswork when sourcing replacement fasteners for CMT cutter heads and routing tools.
- The conical profile provides a self-centering clamping action against the bearing seat, which translates to a more stable bearing lock compared to flat-point alternatives in high-vibration routing environments.
- Part number 990.005.00 is an active CMT replacement part, meaning it is a current, supported component for ongoing maintenance of CMT router bit and cutter head assemblies.
Specifications
- Manufacturer Part Number: 990.005.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING STEI CONICAL M3x3mm UNI-5929
- Small Diameter: M3x3mm
- Macro Class: RP
- Class: RPRB
- Standard: UNI-5929
- Status: Active
Frequently Asked Questions
What is the UNI-5929 standard?
UNI-5929 is an Italian industrial fastener standard that defines the dimensional and geometric requirements for this type of conical screw. The CMT 990.005.00 conforms to this standard, ensuring consistent sizing and compatibility with CMT router bits and cutter heads designed to accept M3 bearing retention screws.
What does the conical design do compared to a flat-point set screw?
The conical point geometry on this STEI screw creates a tapered contact with the bearing seat, which provides a self-centering clamping action. This helps resist loosening under the vibration and rotational forces generated during routing operations, keeping the bearing securely retained in the tool body.
How do I know if this screw fits my CMT router bit?
This screw is sized at M3 x 3mm and is intended for CMT router bits and cutter heads that use M3 bearing retention screws. Check your CMT tool documentation or the existing hardware on your router bit to confirm it requires an M3 conical bearing screw before ordering.
Is this a currently supported CMT replacement part?
Yes. The CMT 990.005.00 carries an Active status, confirming it is a current, supported replacement component within the CMT parts catalog for ongoing maintenance of compatible routing tools.
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