Product Description
CMT Screw for Bearing STEI Flat M4 x 4mm (UNI-5923) is a precision replacement fastener from CMT designed to secure bearings on router bits and cutter heads that use M4 flat STEI screws. This small but critical component keeps bearings firmly in place during routing operations, helping maintain accuracy and safety at the cutting head. Whether you are restoring a worn assembly or replacing a lost screw, having the correct UNI-5923 standard M4 x 4mm STEI flat screw on hand means your CMT tooling stays operational without delay.
Key Features
- STEI flat screw design, M4 x 4mm size - matches the exact fastener specification used in CMT bearing retention systems, ensuring a correct fit without modification or guesswork.
- UNI-5923 standard compliance - conforms to the Italian UNI-5923 fastener standard, so the thread form, head profile, and dimensions are precisely controlled for reliable engagement in compatible CMT tooling.
- Bearing retention function - holds the bearing securely against the router bit or cutter head body, preventing unwanted movement that could affect cut quality or create a safety hazard.
- CMT part number 990.016.00 - an active, genuine CMT replacement component, making it straightforward to identify and reorder the correct part for your specific tool.
Why This Product
- A missing or damaged bearing screw can render an otherwise functional router bit or cutter head unusable - this genuine CMT replacement restores full operability with a part that is specified to fit.
- The M4 x 4mm STEI flat profile is not a generic hardware-store screw; using the correct UNI-5923 standard fastener ensures the bearing seat and screw head interact as intended by CMT's engineers.
- Keeping this screw in your shop inventory means a stripped or lost fastener does not become an extended downtime event - the repair is immediate once the replacement is on hand.
- As an active CMT catalog item (990.016.00), this part reflects current production standards and is a direct, confidence-inspiring match for CMT router bits and cutter heads equipped with M4 STEI flat bearing screws.
Specifications
- Manufacturer Part Number: 990.016.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING STEI FLAT M4x4mm UNI-5923
- Thread Size and Length: M4 x 4mm
- Screw Type: STEI Flat
- Standard: UNI-5923
- Status: Active
Frequently Asked Questions
What is a STEI flat screw and how does it differ from a standard socket set screw?
A STEI flat screw is a type of set screw with a flat-tipped end, conforming to the UNI-5923 standard. The flat tip contacts the bearing or shaft without creating a deep indentation, allowing the bearing to be secured firmly while still permitting removal without significant damage to the mating surface.
Which CMT products use this M4 x 4mm STEI bearing screw?
This screw is intended for CMT router bits and cutter heads that use M4 flat STEI screws for bearing retention. If your CMT bit or cutter head has a small set screw holding the bearing in place and that screw is M4 x 4mm, the 990.016.00 is the correct replacement.
Can I substitute a generic M4 set screw from a hardware store?
While a generic M4 screw may thread into the same hole, it may not conform to the UNI-5923 standard dimensions and head profile required for proper bearing retention in CMT tooling. Using the specified 990.016.00 part ensures the fit and function match CMT's original design intent.
How do I know if this screw needs to be replaced?
Common indicators include a bearing that wobbles or shifts on the bit body, a visible gap between the bearing and the screw seat, a stripped or damaged screw head that prevents proper tightening, or a screw that is simply missing from the assembly. In any of these cases, replacing with the correct M4 x 4mm UNI-5923 STEI flat screw restores proper bearing retention.
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