Product Description
CMT STEI Conical Screw M5 x 5mm with Cup Point (UNI-5929) by CMT is a precision replacement bearing retention screw engineered for use with CMT router bits and cutter heads. Conforming to the UNI-5929 standard, this M5 x 5mm conical set screw features a hardened cup point that bites firmly into mating surfaces, keeping bearings securely locked in position during demanding routing operations. Whether you are restoring a worn cutter head or rebuilding a router bit assembly, having the correct OEM-spec hardware ensures consistent performance and safe operation.
Key Features
- STEI conical M5 x 5mm thread specification - matches the original factory fastener dimensions exactly, ensuring a precise fit with no play or misalignment in the bearing seat
- Cup point tip design per UNI-5929 standard - the cup point indents the bearing surface to create a positive mechanical lock, preventing rotation or axial movement under load
- Conical (STEI) form factor - the tapered geometry distributes clamping force evenly, reducing the risk of surface damage while maximizing holding power against the bearing
- OEM CMT replacement part (Class RPBB) - sourced directly from CMT as an authorized repair and replacement component, guaranteeing compatibility with CMT router bit and cutter head assemblies
Why This Product
- Using the correct OEM-spec M5 x 5mm bearing screw eliminates guesswork during router bit maintenance - you get a verified fit rather than relying on an approximate substitute that may loosen under vibration
- The UNI-5929 cup point standard is a widely recognized fastener specification, meaning this screw meets defined performance criteria for engagement depth and tip geometry - not a generic set screw with unknown tolerances
- Bearing retention failures in router bits are a safety and precision concern; replacing a worn or damaged retention screw with this purpose-designed conical screw restores the assembly to its original holding specification
- As an active CMT replacement part, this screw is a practical addition to any workshop toolbox for technicians or woodworkers who regularly service or rebuild CMT cutter assemblies
Specifications
- Manufacturer Part Number: 990.006.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING STEI CONICAL M5x5mm W/ CUP POINT UNI-5929
- Small Diameter: M5x5mm
- Product Class: RPBB
- Status: Active
Frequently Asked Questions
What is the purpose of the cup point on this screw?
The cup point is a hardened, recessed tip that bites into the surface of the bearing or bearing seat when the screw is tightened. This creates a secure mechanical grip that resists both rotational and axial movement, keeping the bearing firmly retained inside the router bit or cutter head during use.
What does the STEI conical designation mean for this fastener?
STEI refers to the conical (tapered) form of the set screw. The taper geometry allows the screw to distribute clamping load evenly across the contact area, providing a strong and stable hold while minimizing the risk of surface damage on the bearing or housing compared to a flat or dog-point alternative.
Which CMT products is this screw compatible with?
This screw is classified as a CMT bearing replacement part (Class RPBB) and is intended for use with CMT router bits and cutter heads that require an M5 x 5mm STEI conical set screw for bearing retention. If you are unsure whether this screw fits your specific CMT tool, reference the part number 990.006.00 against your tool's parts diagram or service documentation.
Is this an OEM CMT replacement part?
Yes. The CMT part number 990.006.00 is listed as an active replacement part under CMT's RPBB repair and replacement product class, confirming it is a genuine OEM component rather than a generic aftermarket fastener.
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