Product Description
CMT Screw for Bearing STEI Flat M5 x 4mm (UNI-5923) is a precision replacement fastener designed to secure bearings on CMT router bits and cutter heads. This compact M5 x 4mm flat-head screw conforms to the UNI-5923 standard, ensuring a reliable, specification-correct fit that keeps bearings firmly in place during cutting operations - helping maintain accuracy and extending the working life of your tooling investment.
Key Features
- STEI flat-head design per UNI-5923 standard - conforms to a recognized Italian fastener standard, so the screw seats flush and correctly in the bearing retention point without modification or guesswork.
- M5 x 4mm thread specification - the precise diameter and short 4mm thread length match the bearing retention geometry on compatible CMT router bits and cutter heads, preventing over-insertion and protecting the tool body.
- Purpose-built bearing retention fastener - engineered specifically for the task of holding bearings securely during high-speed routing, reducing the risk of bearing migration or loosening mid-cut.
- Active production status - currently manufactured and available as a genuine CMT replacement part, so you can restore a tool to full working condition rather than replacing the entire bit or cutter head.
Why This Product
- Restoring a damaged or missing bearing screw with the correct UNI-5923 specification part means the bearing is held to the same standard as when the router bit left the factory - protecting both the tool and the workpiece.
- The M5 x 4mm size is a precise match for CMT router bit bearing assemblies, eliminating the need to source a generic substitute that may not seat properly or meet the required torque specifications.
- Sourcing a genuine CMT replacement screw (part class RPBB) extends the usable life of an otherwise functional router bit or cutter head, making it a cost-effective alternative to full tooling replacement.
- The flat STEI head profile keeps the fastener low-profile at the bearing seat, avoiding interference with the workpiece or the cutting path during operation.
Specifications
- Brand: CMT Orange Tools
- Order Number: 990.015.00
- Description: SCREW FOR BEARING STEI FLAT M5x4mm UNI-5923
- Thread Size: M5 x 4mm
- Head Style: STEI Flat
- Standard: UNI-5923
- Part Class: RPBB
- Status: Active
Frequently Asked Questions
What is this screw used for?
This screw is used to retain the bearing on CMT router bits and cutter heads. It threads into the bearing seat to hold the bearing securely in position during routing operations.
What does the UNI-5923 designation mean for this fastener?
UNI-5923 refers to an Italian national standards specification that defines the geometry, thread form, and head profile of the fastener. Using a screw that conforms to this standard ensures the correct fit in the bearing retention point of compatible CMT tooling.
What does "STEI flat" mean in relation to the head style?
STEI flat refers to the specific flat-head profile of the screw as defined by the UNI-5923 standard. This profile allows the screw head to sit flush or low-profile at the bearing seat, avoiding any protrusion that could interfere with the cutting path or workpiece surface.
Is this a currently available part or a discontinued item?
This part carries an Active status, meaning it is a currently manufactured and available genuine CMT replacement fastener.
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