Product Description
CMT Screw for Bearing - TCEI M4x6x10mm (Diameter: 7mm, UNI-5931) is a precision replacement fastener from CMT, engineered to secure bearings on router bits and cutter heads that use M4 TCEI socket cap screws. Keeping your tooling properly assembled with the correct bearing retention screw ensures accurate, safe, and consistent cuts - making this small part a critical component for maintaining professional-grade woodworking equipment.
Key Features
- TCEI socket cap screw design (M4x6, UNI-5931 standard) - the internal hex drive provides a secure, positive engagement during tightening, reducing the risk of cam-out and protecting both the fastener and the tooling.
- M4 thread diameter with 6mm thread length - sized precisely for bearing retention applications on compatible CMT router bits and cutter heads, ensuring a correct fit without the guesswork of adapting generic hardware.
- 10mm overall length with 7mm head diameter - the proportions are matched to the bearing seat geometry of CMT tooling, keeping the bearing fully retained without interfering with tool rotation or workpiece clearance.
- Conforms to UNI-5931 standard - manufactured to a defined Italian fastener specification, so dimensions and tolerances are consistent and predictable across replacement parts.
Why This Product
- Using the correct OEM-matched bearing screw - rather than a generic substitute - ensures the bearing seats and stays positioned exactly as CMT designed, preserving cut quality and tool longevity.
- The TCEI (socket cap) drive style requires minimal clearance to tighten, making installation and removal straightforward even in the confined area around a router bit bearing.
- Specified to the UNI-5931 standard, this screw delivers repeatable, reliable clamping force each time a bearing is serviced or replaced on compatible CMT tooling.
- Sourcing a direct replacement screw extends the usable life of existing CMT router bits and cutter heads, avoiding the cost of replacing an entire bit assembly due to a single damaged or missing fastener.
Specifications
- Manufacturer Part Number: 990.052.00
- Brand: CMT Orange Tools
- Description: SCREW FOR BEARING TCEI M4x6x10mm D=7mm UNI-5931
- Screw Type: TCEI Socket Cap Screw
- Thread Size: M4x6
- Overall Length: 10mm
- Head Diameter: 7mm
- Standard: UNI-5931
- For Use With: CMT router bits with M4 TCEI screws
- Country of Origin: Italy
Frequently Asked Questions
What does TCEI mean, and what tool do I need to drive this screw?
TCEI refers to a socket cap screw with an internal hexagonal (Allen/hex key) drive. To install or remove this M4 screw, you will need an appropriately sized hex key or Allen wrench that fits an M4 TCEI socket cap screw.
What is the difference between the thread length and the overall length of this screw?
This screw has an M4x6 specification, meaning the thread engages over 6mm of length. The overall length of the screw - including the head - is 10mm. This distinction matters when fitting the screw into a bearing seat, as the head contributes to the total stack height.
Which CMT router bits or cutter heads is this bearing screw compatible with?
This screw is designed for use with CMT router bits and cutter heads that use M4 TCEI screws for bearing retention. Consult your CMT tooling documentation or the parts diagram for your specific bit or cutter head to confirm this is the correct replacement fastener before ordering.
What does the UNI-5931 designation mean for this screw?
UNI-5931 is an Italian national standard that defines the dimensions, tolerances, and thread specifications for socket cap (TCEI) screws. A screw conforming to this standard will have consistent, predictable geometry - so it fits correctly and clamps reliably in any application specifying UNI-5931.
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