Product Description
CMT Wedge for Router Bit Insert Knives - 5/16" x 25/32" is a precision replacement wedge component designed to securely lock insert knives into CMT cutter heads and router bit bodies. Engineered to fit knives with a diameter of 8mm (5/16") and a cutting height of 20mm (25/32"), this wedge ensures knives stay firmly clamped during operation - reducing the risk of vibration, chatter, or knife shift that can compromise cut quality. Whether you are maintaining a professional router bit setup or restoring a worn cutter head, having the correct replacement wedge on hand keeps your tooling performing at full capacity.
Key Features
- Fits 8mm (5/16") knife diameter with 20mm (25/32") cutting height - matches the exact knife geometry for compatible CMT cutter heads (series 651, 692, 693, 695), so the wedge seats flush and holds the insert knife without play or misalignment.
- Wedge dimensions of 20 x 4.1 x 1.1mm - the slim, precise profile allows the wedge to engage the knife pocket correctly, delivering consistent clamping force across the full contact surface.
- Designed for CMT router bits with insert knives - a direct factory-specification replacement that restores the original knife-retention performance of your cutter head without requiring modification or shimming.
- Compatible with CMT 651, 692, 693, and 695 series cutter heads - broad compatibility across multiple CMT cutter head families means a single part number covers a range of tooling in your shop.
Why This Product
- Using the correct wedge size - 5/16" x 25/32" matching a 20 x 4.1 x 1.1mm profile - eliminates the guesswork of finding a generic substitute, ensuring your insert knives are held to the same tolerances as when the cutter head was new.
- Replacing a worn or damaged wedge in a CMT 651, 692, 693, or 695 series cutter head restores proper knife retention and extends the usable life of the entire router bit body, deferring the cost of a full bit replacement.
- A securely clamped knife wedge reduces micro-movement during cuts, which translates directly to cleaner profiles, reduced tearout, and more consistent results on finished workpieces.
- Sourcing a part-number-specific wedge (651.999.01) rather than a field-adapted alternative means dimensional accuracy is guaranteed for the knife pocket geometry found in compatible CMT cutter heads.
Specifications
- Manufacturer Part Number: 651.999.01
- Brand: CMT Orange Tools
- Diameter: 17.8mm
- Cutting Height: 3.9mm
- Total Length: 2.3mm
- Wedge Dimensions: 20 x 4.1 x 1.1mm
- Knife Diameter Compatibility: 8mm (5/16")
- Knife Cutting Height Compatibility: 20mm (25/32")
- Compatible Cutter Head Series: 651, 692, 693, 695
Frequently Asked Questions
Which CMT cutter heads is this wedge compatible with?
This wedge is designed for use with CMT cutter head series 651, 692, 693, and 695 - specifically those that accept insert knives with an 8mm (5/16") diameter and a 20mm (25/32") cutting height.
What are the exact wedge dimensions for this part?
The wedge measures 20 x 4.1 x 1.1mm. These dimensions correspond to the knife pocket geometry in compatible CMT router bits with insert knives of 5/16" diameter and 25/32" cutting height.
When should this wedge be replaced?
The wedge should be inspected whenever insert knives are changed. If the wedge shows signs of deformation, wear, or no longer holds the knife snugly in the cutter head pocket, replacement with part number 651.999.01 is recommended to restore proper knife retention and safe operation.
Is this wedge sold as a single piece?
The product data lists this item under part number 651.999.01 as a wedge for knives fitting the 5/16" x 25/32" specification. Please confirm quantity with the listing details at time of purchase, as pack information is not specified in the product data.
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