Product Description
CMT Screw for Bearing STEI M5 x 5mm UNI-5923 is a precision replacement fastener designed to secure bearings on CMT router bits and cutter heads. Conforming to the UNI-5923 standard, this M5 x 5mm STEI flat screw delivers a reliable, thread-matched fit that keeps bearings firmly in place during routing operations - reducing the risk of bearing movement, vibration, or premature wear. Whether you are restoring a worn bit or replacing a damaged bearing retention screw, having the correct CMT-specification hardware on hand means less downtime and more consistent cutting performance.
Key Features
- STEI flat head profile (UNI-5923 standard) - conforms to the Italian UNI-5923 fastener standard, ensuring dimensional accuracy and proper seating against the bearing surface for a secure, flush fit
- M5 x 5mm thread specification - matches the factory thread size used on CMT router bits and cutter heads with M5 bearing screws, eliminating the guesswork of sourcing a compatible replacement
- Purpose-built bearing retention design - engineered specifically to hold bearings in position on router bits, maintaining guide bearing alignment and protecting both the workpiece and the bit during use
- Sold as an individual replacement component - allows targeted replacement of a single worn or lost screw without needing to retire or replace an otherwise functional router bit
Why This Product
- Keeping a spare M5 x 5mm UNI-5923 bearing screw on hand means a missing or stripped fastener never has to sideline a CMT router bit - restoring full function quickly without sourcing a substitute that may not fit correctly
- The STEI flat profile and UNI-5923 dimensional standard ensure this screw seats properly against the bearing hub, maintaining the tight tolerances that CMT router bits are designed around
- Direct compatibility with CMT router bits that use M5 bearing screws means no modification, adaptation, or thread chasing is needed - it is a straightforward, drop-in replacement
- As an active CMT part number, this screw is a genuine OEM-specification component, giving woodworkers and shop professionals confidence that the replacement hardware matches the original factory spec
Specifications
- Manufacturer Part Number: 990.001.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING STEI M5x5mm UNI-5923
- Small Diameter: M5x5mm
- Head Style: STEI flat
- Standard: UNI-5923
- For Use With: CMT router bits with M5 bearing screws
- Status: Active
Frequently Asked Questions
What router bits is this screw compatible with?
This screw is designed for use with CMT router bits and cutter heads that use M5 bearing screws. If your CMT bit uses a guide bearing retained by an M5 screw, this UNI-5923 STEI flat screw is the correct replacement fastener.
What does the UNI-5923 designation mean?
UNI-5923 is an Italian national standard that defines the dimensional and geometric specifications for this type of fastener. The designation ensures that the screw conforms to precise tolerances for head profile, thread pitch, and overall dimensions - guaranteeing proper fit and function in the bearing retention application.
What is the thread size of this bearing screw?
The screw is sized M5 x 5mm, meaning it has a 5mm metric thread diameter and a 5mm length. This is the factory specification for CMT router bits that use M5 bearing retention screws, so no modification is needed for a direct replacement.
What does STEI flat head style mean for this application?
The STEI flat head profile is a specific fastener head geometry defined under the UNI-5923 standard. In bearing retention applications, this head style allows the screw to seat flush and securely against the bearing hub, helping to keep the guide bearing properly aligned and locked in place while the router bit is in use.
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