Product Description
The CMT Screw for Bearing TCEI M3 x 10 x 13mm (Diameter: 5.5mm, UNI-5931) is a precision replacement fastener designed to secure bearings on CMT router bits and cutter heads. Conforming to the UNI-5931 standard, this TCEI socket head cap screw delivers a reliable, properly torqued connection that keeps bearings locked in position during demanding routing operations. Whether you are restoring a worn assembly or keeping a set of CMT router bits in peak working condition, having the correct replacement screw on hand ensures consistent, safe performance at the spindle.
Key Features
- TCEI socket head cap screw design - the internal hex drive allows precise torque application in tight bearing recesses where a standard screwdriver could not reach, reducing the risk of cam-out and damaged hardware.
- M3 x 10 thread specification - matches the factory thread pitch and engagement depth of CMT bearing retention assemblies, ensuring a secure fit without the guesswork of trial-and-error sizing.
- 13mm overall length - provides the correct engagement depth so the screw seats fully and holds the bearing firmly without bottoming out prematurely or leaving threads exposed.
- 5.5mm head diameter - sized to seat flush within the bearing pocket, preventing interference with bearing rotation and maintaining clean, unobstructed cutter geometry.
- UNI-5931 standard compliance - manufactured to an established Italian national standard, confirming dimensional accuracy and interchangeability with other UNI-5931 compliant components in CMT tool assemblies.
- CMT replacement parts (RP) classification - sourced directly from the CMT replacement parts program, so this screw is the correct OEM-spec component for bearing retention rather than an aftermarket approximation.
Why This Product
- Using the correct OEM-spec TCEI M3 x 10 bearing screw preserves the dimensional integrity of a CMT router bit assembly, preventing bearing wobble or premature failure caused by a mismatched fastener.
- The UNI-5931 dimensional standard means this screw is not an approximation - it is built to the same specification as the screw installed at the factory, giving you confidence in a like-for-like replacement.
- The 5.5mm head diameter and 13mm body length work together as a system - replacing only one dimension with an off-the-shelf substitute risks improper seating, making this matched-spec screw the practical choice for a lasting repair.
- Stocking this dedicated replacement fastener means a bearing swap or routine maintenance task is not held up by sourcing delays, keeping your router bits ready for the next job.
Specifications
- Manufacturer Part Number: 990.053.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING TCEI M3x10x13mm D=5.5mm UNI-5931
- Screw Type: TCEI M3x10 UNI-5931
- Thread Size and Length: M3x10x13mm
- Head Diameter: 5.5mm
- Product Class: RPRB (Replacement Bearing Parts)
Frequently Asked Questions
What does TCEI mean, and why does it matter for this screw?
TCEI is the designation for a socket head cap screw with an internal hex (Allen) drive. This style is specified for bearing retention on CMT router bits because the recessed hex socket allows an Allen key to apply controlled torque precisely in the tight space around the bearing, providing a more secure and repeatable tightening action than a slotted or Phillips head would allow.
What does the UNI-5931 designation mean for this fastener?
UNI-5931 is an Italian national standard that defines the dimensional and geometric requirements for socket head cap screws. Because this screw is manufactured to that standard, its thread pitch, head diameter, and overall length conform to a verified specification - the same specification CMT uses in its original bearing retention assemblies.
How do I know this screw is compatible with my CMT router bit?
This screw is designed for CMT router bits and cutter heads that use an M3 TCEI bearing retention screw. If your bit currently uses an M3 socket head cap screw to hold its bearing in place and that screw has a 5.5mm head diameter and approximately 13mm overall length, this is the correct replacement. Verify the thread size and head dimensions against your existing hardware before ordering.
Can this screw be used in non-CMT applications that call for a UNI-5931 M3x10 TCEI screw?
Because this screw conforms to the UNI-5931 standard with an M3x10 thread, a 13mm overall length, and a 5.5mm head diameter, it is dimensionally compatible with any assembly that specifies those same values under the UNI-5931 standard. However, this part is classified and sourced as a CMT replacement component, so compatibility with non-CMT equipment should be confirmed by verifying the dimensional requirements of the specific application.
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