Product Description
The CMT 657.994.11B Pattern/Flush Trim Bit with Insert Knives is a professional-grade router bit engineered for precision flush trimming and pattern routing applications. With a 3/4 in. cutting diameter, a long 1-31/32 in. cutting height, and a 1/2 in. shank, this two-flute hardwood-compatible bit is built to handle demanding template and flush trimming work on a wide range of materials. CMT has equipped this bit with top and bottom ball bearing guides, giving woodworkers the stability and accuracy needed for clean, consistent results on both hand routers and router tables. The reversible insert knife design means reduced downtime and lower long-term tooling costs - making it a practical choice for production environments and serious woodworking shops alike.
Key Features
- Top and Bottom Ball Bearing Guides - dual bearings provide extra stability during flush trimming and pattern routing, reducing the risk of bit deflection and improving cut quality on difficult or irregular workpieces.
- Reversible Insert Knives (2-sided) - each knife can be flipped to expose a fresh cutting edge, extending usable tool life and lowering the cost per cut compared to single-sided fixed knives.
- Torx Screw Fastening - insert knives are secured with Torx screws that hold the blades firmly in place during high-speed routing, supporting safe and reliable operation.
- 1-31/32 in. Cutting Height - the extended cutting length allows for flush trimming of thicker stock and deeper pattern passes in a single operation, reducing the need for multiple passes.
- HW (Hardwood) Insert Knife Material - the hardwood-grade insert knives maintain a sharp edge through repeated use on dense hardwoods, softwoods, plywood, MDF, chipboard, laminates, and plastics.
- Right-Hand Rotation - standard RH rotation is compatible with the vast majority of hand routers and router tables, making this bit a straightforward drop-in addition to an existing tool setup.
- 1/2 in. Shank Diameter - the larger 1/2 in. shank provides greater rigidity and reduced vibration compared to 1/4 in. shank bits, contributing to smoother cuts and longer bearing life.
- 4-11/32 in. Total Length - the overall length accommodates both top and bottom bearing placement while keeping the bit well-supported in the collet at its 1/2 in. shank.
Why This Product
- The combination of top and bottom ball bearing guides makes this bit uniquely suited for both pattern routing and flush trimming in a single tool - eliminating the need to switch between separate bits when working with templates or guide bushings.
- The reversible, two-sided insert knife system means a fresh cutting edge is available without purchasing an entirely new bit - a direct cost advantage for shops that do frequent flush trimming or production template work.
- The extended 1-31/32 in. cutting height handles thicker workpieces and deeper passes that shorter flush trim bits cannot accommodate, making it the right choice when working with thick laminates, solid hardwood panels, or layered plywood assemblies.
- Torx screw retention keeps insert knives locked securely at routing speeds, reducing the risk of blade movement that could compromise cut quality or operator safety during production runs.
Specifications
- Manufacturer Part Number: 657.994.11B
- Brand: CMT Orange Tools
- Cutting Diameter: 3/4 in.
- Cutting Height: 1-31/32 in.
- Shank Diameter: 1/2 in.
- Total Length: 4-11/32 in.
- Number of Teeth: 2
- Material: HW
- Rotation: Right-Hand (RH)
Approved Applications
- Flush Trimming
- Pattern Routing
- Template Routing
- Finishing Operations
- Hardwood
- Softwood
- Plywood
- MDF
- Chipboard
- Laminates
- Plastics
Frequently Asked Questions
What is the difference between a pattern bit and a flush trim bit, and does this bit do both?
A flush trim bit uses a bearing to follow the edge of the workpiece being cut, while a pattern bit uses a bearing to follow a separate template. This bit is designed to perform both functions. It is equipped with both a top and a bottom ball bearing guide, so it can be used in either orientation - following a template above or below the workpiece - without changing bits.
How do the reversible insert knives work, and when should they be replaced?
The insert knives in this bit are sharpened on both sides. When one cutting edge becomes dull, the knife can be removed by loosening the Torx screw, flipped over, and reinstalled to present a fresh edge. This gives the user two usable cutting surfaces per knife before replacement inserts are needed, reducing tooling cost over time.
Is this bit compatible with a router table as well as a handheld router?
Yes. The 1/2 in. shank diameter is compatible with hand routers fitted with a 1/2 in. collet and with router tables that accept 1/2 in. shank bits. The right-hand rotation is the standard direction for these machines. For handheld use with a 1/4 in. collet, an adapter or a different bit would be required.
What type of screwdriver or bit is needed to change the insert knives?
The insert knives are secured with Torx screws. A Torx driver of the appropriate size is needed to remove and reinstall the knives. Torx fasteners are used specifically because they provide a more secure grip during tightening compared to standard hex or Phillips head screws, helping to keep the knives firmly seated at routing speeds.
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