Product Description
The CMT Screw for Bearing - Torx T15 TBTI M4 x 4 x 6.2mm (Diameter: 8.8mm) is a precision replacement fastener designed to secure knife inserts and bearings on CMT router bits and cutter heads. This T15 Torx-drive screw provides the holding strength and exact fitment needed to keep cutting inserts locked firmly in place during demanding routing operations, giving woodworkers and shop professionals confidence that their tooling stays securely assembled under load. Designed to match the original factory specification, this small but critical component helps restore full performance to insert-style router bits when a screw becomes worn, stripped, or lost.
Key Features
- Torx T15 drive head - the T15 socket profile provides high torque transfer with reduced cam-out risk, allowing you to tighten the screw securely without stripping the drive recess
- TBTI screw design - the tamper-resistant Torx-type (TBTI) configuration helps maintain proper clamping force on knife inserts, ensuring cutting edges stay indexed correctly during use
- M4 x 4 x 6.2mm thread dimensions - precise metric sizing matches the original factory fastener specification on compatible CMT insert router bits, so the screw seats and threads correctly without modification
- 8.8mm head diameter - the wider bearing-contact surface distributes clamping load evenly across the insert seat, reducing the risk of localized stress on the cutter body
- CMT original replacement part - sourced directly from CMT as a genuine spare, ensuring dimensional accuracy and material consistency with the bits it is designed to service
Why This Product
- When a single stripped or missing screw sidelines an otherwise good set of insert router bits, this exact-fit replacement gets your tooling back in service quickly without needing to replace the entire bit or cutter head
- The T15 Torx drive combined with TBTI geometry gives a positive, slip-resistant grip during tightening - important when working with small fasteners that must be torqued precisely to hold cutting inserts at the correct depth
- Knowing the screw dimensions match the CMT factory spec (M4 x 4 x 6.2mm, 8.8mm diameter) means no guessing about compatibility - it is the right part for CMT insert router bits that use T15 Torx screws
- Keeping a spare on hand is a low-cost way to prevent unexpected downtime in a production or cabinet shop environment where insert-style router bits see regular use and screw replacement is part of routine maintenance
Specifications
- Manufacturer Part Number: 990.056.00
- Description: Screw for Bearing Torx T15 TBTI M4 x 4 x 6.2mm D=8.8mm
- Drive Type: Torx T15 TBTI
- Thread Size: M4 x 4 x 6.2mm
- Diameter: 8.8mm
- For Use With: CMT insert router bits with T15 Torx screws
- Brand: CMT Orange Tools
Frequently Asked Questions
What router bits is this screw compatible with?
This screw is designed for use with CMT insert router bits and cutter heads that use T15 Torx screws to retain the knife inserts. If your CMT insert bit uses a T15 Torx drive for its clamping screws, this M4 x 4 x 6.2mm TBTI screw with an 8.8mm head diameter is the correct replacement fastener.
What tool do I need to install or remove this screw?
A T15 Torx driver or T15 Torx bit is required to install and remove this screw. The TBTI (tamper-resistant) profile is compatible with standard T15 Torx drivers, making it straightforward to service your insert bits with a commonly available workshop tool.
Why is the head diameter of this screw important?
The 8.8mm head diameter is a critical dimension because it determines how the screw bears against the insert or bearing seat on the cutter body. Using a screw with the wrong head diameter can result in inadequate clamping force or improper seating, which could affect cutting performance and safety. This screw matches the CMT factory specification exactly.
Is this a genuine CMT replacement part?
Yes. This screw carries the CMT part number 990.056.00 and is a genuine CMT replacement component, ensuring the dimensions and material are consistent with the original fasteners used in CMT insert router bits and cutter heads.
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