Product Description
CMT Rabbeting Bits with Insert Knives by CMT deliver precise rabbet cuts in hardwood, chipboard, and MDF with a 1-3/8 in. cutting diameter and a 1/2 in. cutting depth. Designed for portable routers with a 1/2 in. shank, this right-hand rotation bit uses two replaceable carbide insert knives secured by special Torx screws, making it a practical and efficient choice for cabinet door making, drawer front fitting, and general rabbeting work in both solid wood and engineered board materials.
Key Features
- Two reversible insert knives sharpened on all 4 sides - each knife can be rotated to a fresh edge rather than immediately replaced, extending usable life and reducing downtime during demanding production runs.
- Knives secured by special Torx screws - positive mechanical retention keeps the insert knives locked precisely in position during the cut, contributing to consistent rabbet dimensions and a clean finished surface.
- 1-3/8 in. cutting diameter with 15/32 in. cutting height - sized to produce accurate rabbets in a single pass on portable routers, minimizing setup time when working with hardwood, MDF, or chipboard.
- HW (carbide) insert knife material - hardwood-grade carbide maintains a sharp edge longer than standard HSS tooling, making this bit suitable for abrasive engineered materials such as MDF and chipboard where edge retention matters most.
- 1/2 in. shank diameter with 2-33/64 in. overall length - the full 1/2 in. shank provides a stable, low-vibration grip in the router collet, improving cut quality and operator control on portable routers.
- Right-hand rotation - compatible with standard portable routers and router tables, ensuring safe and correct tool engagement without special setup.
Why This Product
- The 4-sided reversible insert knives mean you can rotate to a fresh cutting edge on the job site or in the shop without immediately sourcing a replacement - a practical advantage when working through large quantities of cabinet panels or MDF components.
- At a 1/2 in. cutting depth and 1-3/8 in. diameter, this bit produces clean, consistent rabbets for inset door and drawer front joinery without requiring multiple passes, saving time in production cabinetry and furniture workflows.
- The carbide (HW) insert material handles the abrasive nature of chipboard and MDF - two of the most common engineered materials in modern cabinetry - where softer tooling would dull quickly and leave a rough edge.
- With a 1/2 in. shank and compact 2-33/64 in. overall length, this bit fits securely in standard 1/2 in. collet portable routers, making it a versatile addition for both bench-top router table setups and freehand rabbeting tasks.
Specifications
- Manufacturer Part Number: 660.851.11
- Brand: CMT Orange Tools
- Cutting Diameter: 1-3/8 in.
- Cutting Depth: 12.70 mm
- Cutting Height: 15/32 in.
- Total Length: 2-33/64 in.
- Shank Diameter: 1/2 in.
- Number of Teeth: 2
- Material: HW
- Rotation: Right-Hand
Approved Applications
- Rabbeting in hardwood, softwood, and engineered lumber
- Chipboard and MDF panel edge processing
- Cabinet door inset and drawer front fitting
- Portable router use
Frequently Asked Questions
How many sides can the insert knives be used before they need to be replaced?
Each insert knife is sharpened on all 4 sides, meaning you can rotate each knife up to 4 times to expose a fresh cutting edge before replacement is needed. With 2 knives included, this gives you a significant number of usable edges before new insert knives are required.
What materials can this rabbeting bit cut through?
According to the product data, this bit is designed for chipboards, hardwood, and MDF. The HW (carbide) insert knife material makes it particularly well suited to abrasive engineered board materials like MDF and chipboard, as well as solid hardwood applications.
What type of router is this bit compatible with?
This bit is designed for use on portable routers. It has a 1/2 in. shank diameter and right-hand rotation, which is standard for portable routers and router tables equipped with a 1/2 in. collet.
What is the actual cutting depth this bit produces?
The cutting depth is 12.70 mm (nominal 1/2 in.). The cutting height - the length of the edge that contacts the workpiece - is 15/32 in., and the overall cutting diameter is 1-3/8 in.
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