Product Description
CMT 990.400.00 Shield for M3 Screw - 3.2 x 7 x 0.5mm is a precision-engineered washer-style shield designed to protect screw seating surfaces on CMT router bits and cutter heads that use M3 screws. With a 3.2mm bore diameter, 7mm outer diameter, and 0.5mm plate thickness, this compact shield ensures a clean, secure fit that helps distribute clamping force evenly - reducing wear and protecting both the fastener and the cutting tool body over repeated use.
Key Features
- 3.2mm bore diameter - fits precisely over M3 screw shafts, ensuring proper alignment and preventing lateral movement during cutter head assembly
- 7mm outer diameter - provides broad, even load distribution around the screw head, protecting the seating surface from damage and prolonging tool life
- 0.5mm plate thickness - a slim, low-profile design that fits within tight clearances on router bit bodies without interfering with cutting geometry
- Part of CMT's 990 Shields series - engineered as a purpose-built replacement and maintenance component for CMT router bits, ensuring compatibility within the CMT system
Why This Product
- Designed specifically for CMT router bits that use M3 screws, this shield is a direct-fit maintenance component - eliminating the guesswork of sourcing a generic washer that may not seat properly
- The 0.5mm low-profile thickness allows the shield to seat flush within confined cutter head geometries, supporting accurate, repeatable assembly every time
- Using a proper shield beneath M3 screw heads helps protect carbide insert seats and cutter body surfaces from fastener-induced wear, extending the usable life of the router bit or cutter head
- As an active CMT replacement part, this shield supports ongoing tool maintenance rather than full tool replacement - a practical, cost-effective solution for workshop upkeep
Specifications
- Manufacturer Part Number: 990.400.00
- Brand: CMT Orange Tools
- Description: 3.2 x 7 x 0.5mm Shield for M3 Screw
- Outer Diameter: 7mm
- Bore Diameter: 3.2mm
- Plate Thickness: 0.020 in.
- Series: 990 - Shields
- Status: Active
Frequently Asked Questions
What is this shield used for?
This shield functions as a washer-style component placed beneath M3 screws on CMT router bits and cutter heads. It distributes clamping force evenly across the screw seating surface, helping to prevent damage to the tool body during assembly and repeated use.
What are the exact dimensions of this shield?
The shield has a 3.2mm bore diameter, a 7mm outer diameter, and a plate thickness of 0.020 in. (approximately 0.5mm). These dimensions correspond to the standard M3 screw shield size in CMT's 990 Shields series.
Which CMT screw does this shield pair with?
This shield is designed for use with CMT router bits and cutter heads that use M3 screws, such as the CMT 990.051.00. The 3.2mm bore accommodates the M3 screw shaft with the appropriate clearance for proper seating.
Is this a standard replacement part or a specialty item?
This is an active, standard replacement and maintenance component within CMT's 990 Shields product line. It is a stock catalog item intended for routine upkeep of CMT router bits and cutter heads that use M3 hardware.
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