CMT Router Bit for Domino Joining - 4mm RH is a precision-engineered spiral router bit by CMT, built specifically for use with the Festool DF500 Domino joinery machine. Designed to rout accurate mortise slots in solid wood and wood composite materials, this 4mm right-hand bit delivers the tight tolerances that furniture makers and cabinet assemblers depend on for strong, repeatable Domino loose-tenon joints. With a 2-flute spiral design, extra-fine micrograin carbide cutting edges, and a black P.T.F.E. non-stick coating, this bit is engineered for clean cuts and long service life in demanding joinery applications.

Key Features

• Extra-fine micrograin carbide spiral cutting portion - delivers exceptionally clean slot walls and precise mortise geometry, reducing tearout and the need for cleanup work in solid hardwood and wood composite materials.
• Premium super-strength steel body - provides the structural rigidity needed to maintain cutting accuracy under the lateral forces generated during Domino slot routing, keeping the bit stable and true throughout the cut.
• Black P.T.F.E. coating on the spiral portion - prevents pitch, resin, and glue buildup on the flutes, so the bit stays cleaner during extended use and resists the corrosive effects of wood acids and adhesives.
• 2 cutting edges (Z2) with 2 spiral flutes - provides efficient chip evacuation from the mortise slot, reducing heat buildup and keeping cuts smooth even in dense hardwoods and chipboard.
• Right-hand rotation (RH) - matches the spindle direction of the Festool DF500 Domino machine, ensuring correct engagement and safe, predictable cutting performance.
• M6x0.75mm thread shank - engineered to thread directly and securely into the Festool DF500 collet, providing a rigid, vibration-minimizing connection between the machine and the cutting edge.
• 11mm cutting height with 1 1/2 in. total length - sized to produce mortise slots of the correct depth for standard Domino loose tenons while maintaining a compact profile suited to the DF500 tool envelope.

Why This Product

• Purpose-built for the Festool DF500 - this bit is engineered specifically for Domino joinery machines, so it threads in correctly and cuts to the geometry required for proper Domino tenon fit - no improvising with generic bits that may not match shank threads or cutting dimensions.
• Micrograin carbide construction for joinery-quality slots - furniture and cabinet work demands mortise slots with clean walls and consistent depth; the extra-fine carbide formulation supports that level of precision in both solid wood and composite panels.
• P.T.F.E. coating extends working life in production use - for shops routing large numbers of Domino joints, a bit that resists pitch and glue accumulation stays sharper longer and requires less frequent cleaning or replacement.
• Compact 4mm diameter for small-tenon joinery - the 4mm size opens up joinery options for thinner stock and smaller components where larger Domino bit sizes would not be practical, expanding the range of work the DF500 can handle.

Specifications

• Manufacturer Part Number: 380.040.11
• Brand: CMT Orange Tools
• Diameter: 4mm
• Cutting Height: 11mm
• Total Length: 1 1/2 in.
• Shank: M6x0.75mm
• Rotation: Right-hand (RH)
• Number of Cutting Edges: 2
• Number of Flutes: 2
• Material: HWM (extra-fine micrograin carbide spiral portion with premium super-strength steel body)
• For Machine: Festool DF500
• Product Type: Router Bit for Domino Joining

Approved Applications

• Mortise slot routing for Domino loose-tenon joinery
• Solid wood furniture joinery
• Cabinet and casework assembly
• Wood composite panel joining (chipboard, MDF, plywood)

Frequently Asked Questions

Which machine is this router bit designed for?

This bit is designed for use with the Festool DF500 Domino joinery machine. It features an M6x0.75mm threaded shank that interfaces directly with the DF500 collet, and it rotates right-hand (RH) to match that machine's spindle direction.

What materials can this bit cut?

The CMT 380.040.11 is designed to rout slots in solid wood and wood composites, including hardwood, softwood, chipboard, MDF, and plywood - making it suitable for a broad range of furniture and cabinet joinery applications.

What is the purpose of the P.T.F.E. coating on this bit?

The black P.T.F.E. coating is applied to the spiral portion of the bit to prevent pitch, resin, and glue from adhering to the flutes during cutting. This helps maintain cutting performance over extended use and makes the bit easier to clean between applications.

How many cutting edges does this bit have, and why does it matter?

This bit has 2 cutting edges (Z2) and 2 spiral flutes. The dual-flute spiral design promotes efficient chip evacuation from the mortise slot during cutting, which helps reduce heat buildup and contributes to cleaner slot walls in both solid wood and panel materials.