Product Description
CMT Screw for Bearing STEI Pin M8 x 16mm (UNI-5925) is a precision replacement fastener from CMT, designed to secure bearing assemblies in CNC chuck setups used with CMT router bits and cutter heads. Conforming to the UNI-5925 standard, this M8 x 16mm STEI pin screw delivers the exact thread pitch, head geometry, and dimensional tolerances required to maintain tight, reliable bearing retention - keeping your CNC tooling components firmly in place during demanding routing operations. Whether you are restoring a worn assembly or replacing a damaged fastener, this CMT replacement screw ensures your chuck system performs as intended.
Key Features
- STEI Pin configuration in M8 x 16mm - matches the precise thread size and engagement length needed for correct bearing retention in CMT CNC chuck assemblies, eliminating the guesswork of finding a compatible substitute.
- UNI-5925 standard compliance - manufactured to the established Italian UNI fastener standard, ensuring dimensional accuracy and interchangeability with other UNI-5925 compatible components in your tooling system.
- CMT genuine replacement part - sourced directly from CMT as an official replacement, meaning you get the exact fastener specification engineered for the original assembly rather than an approximation.
- Active product status - currently in production and supported by CMT, so you can depend on consistent availability when maintenance or repair of your CNC chuck is needed.
Why This Product
- When a bearing screw fails or is lost during chuck disassembly, using the correct M8 x 16mm STEI pin screw to the UNI-5925 specification restores the assembly to its original engineered condition - avoiding mismatched hardware that could compromise bearing integrity.
- As a genuine CMT replacement part, this screw is designed specifically for CMT CNC chuck bearing assemblies, reducing the risk of fit issues that can arise when using generic hardware not matched to the original specification.
- The UNI-5925 standard designation gives maintenance technicians and woodworking professionals a clear reference point, making it straightforward to verify compatibility and document repairs on CNC routing equipment.
- Keeping this fastener on hand as a spare minimizes downtime - a single missing or damaged bearing screw can take a CNC chuck out of service, and having the correct replacement readily available keeps production moving.
Specifications
- Manufacturer Part Number: 990.064.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING STEI Pin M8 x 16mm UNI-5925
- Thread Size and Length: M8 x 16mm
- Standard: UNI-5925
- Type: STEI Pin Screw
- Product Class: RPRB
- Status: Active
Frequently Asked Questions
What does the UNI-5925 designation mean for this screw?
UNI-5925 is an Italian national standard that defines the dimensional and geometric requirements for this fastener type. When a screw is described as conforming to UNI-5925, it means the thread profile, pitch, and overall dimensions meet that standardized specification - ensuring predictable fit and function in assemblies designed around that standard, such as CMT CNC chuck bearing applications.
What is a STEI pin screw and how does it differ from a standard hex bolt?
A STEI pin screw is a specific fastener configuration defined under the UNI-5925 standard. It is engineered for precision assembly applications such as bearing retention in CNC tooling chucks, where consistent clamping force and exact dimensional fit are critical. Unlike a general-purpose hex bolt, the STEI pin form is intended for defined mechanical assemblies where the fastener geometry directly affects component alignment and performance.
Which CMT chuck assemblies use this M8 x 16mm bearing screw?
This screw is intended for use in CMT CNC chuck bearing assemblies. The existing product documentation references CMT CNC chucks in the 183.420, 183.421, and 183.422 product family as applications for this bearing screw type.
Is this screw a genuine CMT replacement part or an aftermarket item?
This is a genuine CMT replacement part carrying the official CMT manufacturer part number 990.064.00. It is listed as an active product in the CMT catalog, meaning it is currently produced and supported as an original replacement component for CMT tooling assemblies.
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