Product Description
The CMT 990.410.00 Shield for M4 Screw is a precision-machined washer measuring 4.3 x 9 x 0.8mm, engineered to work with M4 screws on CMT router bits and cutter heads. This small but essential hardware component - part of CMT's 990 Shields series - provides proper clamping support and helps protect cutting insert seating surfaces during assembly and use. Whether you are replacing a worn shield or restocking your router bit hardware, this part ensures your CMT tooling stays properly assembled and ready for accurate, reliable performance at the router table or shaper.
Key Features
- 4.3mm inner diameter - sized to fit precisely over an M4 screw shank, ensuring centered, stable seating without play or misalignment during clamping
- 9mm outer diameter - provides adequate bearing surface to distribute clamping load evenly around the screw head, protecting the tooling body from point-load damage
- 0.8mm thickness - a slim profile that fits within tight clearance spaces on router bits and cutter heads without interfering with cutting geometry
- Designed for M4 screw compatibility - matches the CMT 990 Shields series hardware family, making this a direct, reliable replacement part for CMT router bit assemblies using M4 fasteners
- Part of the CMT 990 Shields series - sourced from within a coordinated hardware system so you can confidently pair this shield with other CMT replacement components
Why This Product
- When a shield washer on a CMT router bit becomes damaged or lost, the entire cutter assembly can lose proper clamping integrity - this replacement part restores that integrity with a spec-matched, direct-fit component
- The 4.3 x 9 x 0.8mm dimensions are precisely matched to the M4 screw geometry used in CMT router bits, eliminating guesswork when sourcing replacement hardware for your tooling
- Replacing a worn or missing shield washer is far more economical than replacing an entire router bit or cutter head - keeping your CMT tooling productive with a low-cost maintenance part
- As an active CMT part number in the 990 Shields series, this washer is a current production component designed to maintain the performance standards of your existing CMT router bits and cutter heads
Specifications
- Manufacturer Part Number: 990.410.00
- Brand: CMT Orange Tools
- Description: 4.3 x 9 x 0.8mm Shield for M4 Screw
- Inner Diameter: 4.3mm
- Outer Diameter: 9mm
- Thickness: 0.8mm
- Compatible Screw Size: M4
- Series: 990 - Shields
- Status: Active
Frequently Asked Questions
What screw size is this shield designed to fit?
This shield is designed for use with M4 screws, as used on CMT router bits and cutter heads. The 4.3mm inner diameter accommodates the M4 screw shank with proper clearance for secure, aligned clamping.
What are the exact dimensions of this shield washer?
The CMT 990.410.00 shield measures 4.3mm inner diameter, 9mm outer diameter, and 0.8mm in thickness. These dimensions correspond to the designation "WASHER 4.3/9x0.8mm" in the CMT 990 Shields series.
Which CMT product series does this shield belong to?
This shield is part of CMT's 990 Shields series, a coordinated family of replacement hardware components designed to support the maintenance and upkeep of CMT router bits and cutter heads that use M4 fasteners.
Is this shield still an active CMT part?
Yes, CMT part number 990.410.00 carries an active status, meaning it is a current production component and a supported replacement part within the CMT hardware lineup.
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.