Festool 493491 DF 500 Domino Cutter, 6mm is a carbide-tipped replacement cutter for the Festool DOMINO DF 500 joining machine. This is a DOMINO cutter designed for cutting 6 mm mortises for loose-tenon joinery. Model Number: 493491. If you use the DF 500 for cabinet work, furniture, built-ins, or trim joinery, this cutter is the correct size for Festool 6 mm DOMINO tenons and gives you the proper mortise width the system is built around.

The big reason this cutter matters is fit. In a joinery system like the DOMINO, the cutter and tenon size need to match if you want repeatable alignment and solid glue joints. Festool specifies this cutter for 6 mm tenons, so you are not guessing at mortise size or trying to make another bit work. That makes setup simpler and helps you get consistent results when you are laying out face frames, panel assemblies, cabinet boxes, or smaller furniture parts.

The cutting end is carbide tipped, which is the right call for a high-use joinery accessory. Festool states a service life of roughly 5,000 to 14,000 joints depending on the material. In practical terms, softer sheet goods and easier woods will let the cutter go longer, while dense hardwoods will wear it faster. Either way, carbide gives this cutter the durability needed for repeated plunges and production-style work.

Spiral flutes are another detail that matters on the job. They help the cutter clear material efficiently and produce clean cuts, which is exactly what you want in a mortising accessory. A clean mortise means less cleanup, more predictable fit with the tenon, and fewer surprises during glue-up. For woodworkers who care about tight alignment and assembly speed, that is a real advantage over a cutter that tears fibers or leaves a rough cavity.

Festool also uses an internally threaded design for quick bit changes. That is a small feature until you are switching between different tenon sizes during a project. Then it becomes a time saver. If your workflow includes changing from smaller 5 mm or 6 mm joinery in face frames to larger joints elsewhere, a cutter that swaps easily helps keep the DF 500 useful as a system tool instead of a one-size-only machine.

In terms of size, this cutter has a diameter of 1/4 inch, which is 6 mm, and a cutter length of 1-1/8 inches, which is 28 mm. Acme also lists a maximum speed of 24,300 RPM. Those are not just catalog numbers. They tell you this is a purpose-built accessory sized specifically for the DF 500 platform and meant to work at the operating speeds required by Festool's joiner.

Compatibility is straightforward. This cutter is suitable for the Festool DF 500 and is intended for use with 6 mm DOMINO tenons. If you own a different machine in the DOMINO lineup, this product should not be treated as a universal cutter. It is best thought of as the correct replacement or spare cutting accessory for DF 500 users who want to stay inside the intended Festool joinery system.

Who should buy it? Anyone already invested in the Festool DF 500 who regularly cuts 6 mm mortises in wood. That includes cabinet installers, finish carpenters, furniture builders, millwork shops, and serious DIY woodworkers who want accurate loose-tenon joinery without improvising. If 6 mm tenons are part of your normal workflow, keeping a fresh Festool 493491 DF 500 Domino Cutter, 6mm on hand is just smart shop planning.

Festool 493491 DF 500 Domino Cutter, 6mm Keeps Your Joinery System Honest

If you run a DF 500 regularly, this is the cutter you want for clean 6 mm mortises and dependable tenon fit without experimenting.

• Who it's for: DF 500 owners doing cabinet work, furniture builds, trim assemblies, and other wood joinery that uses 6 mm DOMINO tenons.
• Why it stands out: It is carbide tipped, sized correctly for Festool 6 mm tenons, and built with spiral flutes for cleaner mortises and easier repeat work.
• Worth knowing: This is a machine-specific accessory, not a universal cutter. It makes the most sense if 6 mm joinery is already part of your workflow on the Festool DF 500.

• What machine is this cutter made for? It is listed as suitable for the Festool DOMINO DF 500 joining machine.
• What tenon size does it match? This cutter is made for Festool 6 mm DOMINO tenons and creates the proper mortise width for that size.
• What is the cutter size? The cutter diameter is 1/4 inch, which is 6 mm, and the cutter length is 1-1/8 inches, which is 28 mm.
• How long does the cutter last? Festool states the carbide-tipped bit can withstand about 5,000 to 14,000 joints, depending on the material being cut.