The CMT 380.050.11 Compatible with Domino Jointing Machine by Festool DF500 - Solid Carbide Bit, 5mm (13/64-Inch), M6x0.75mm Shank is a replacement cutter bit for loose tenon joinery. This is a domino joiner cutter bit designed for routing 5 mm slots in solid wood and wood composites. Model Number: 380.050.11. If you run a Festool DF500 and need a dedicated 5 mm cutter for accurate mortises, this is the part that does that job.

The core numbers here are straightforward and useful: a 5 mm cutting diameter, 20 mm cutting length, and 49 mm overall length. In real use, that means the bit is sized for smaller Domino joinery work where you want controlled, clean mortises without overcutting the stock. The spiral cut design and two flutes are there for a reason: they help the bit cut efficiently and clear material as it plunges into the workpiece.

CMT builds this bit from solid carbide, which is the big story. On a cutter like this, material matters because it directly affects edge life, heat resistance, and how well the bit keeps cutting clean after repeated plunges. Supplementing that, CMT also lists a black PTFE coating that helps reduce residue buildup and overheating. That is not just a spec sheet detail. On repetitive joinery work, less buildup means more consistent cutting and less time stopping to clean the cutter.

The bit also features a center point along with two cutting edges and two spiral flutes. That combination is meant to support controlled entry into the material and stable cutting through the full mortise. For cabinet parts, face frames, trim assemblies, and smaller furniture components, that control is what helps keep the slot where you want it and the joint fitting the way it should.

Compatibility is clearly defined. This bit is listed for use on Domino machines and specifically calls out the Festool DF500. The shank thread is M6 x 0.75 mm, which is one of the fitment details you do not want to get wrong when ordering a replacement cutter. If you are replacing a worn 5 mm DF500 cutter or keeping a spare on hand so the machine never sits idle, this is the information that matters.

This is not a general-purpose straight router bit for a handheld router table setup. It is a machine-specific joinery accessory for Domino-style slot cutting. That makes it a better fit for woodworkers, finish carpenters, cabinet installers, and serious DIY users already working in the Festool Domino system. If you own the DF500 and regularly cut 5 mm mortises, this is the kind of replacement part worth having before you need it, not after the current cutter is already dull.

CMT 380.050.11 Compatible with Domino Jointing Machine by Festool DF500 - Solid Carbide Bit, 5mm (13/64-Inch), M6x0.75mm Shank is the right buy for DF500 owners who want a dedicated 5 mm replacement cutter

This is a machine-specific joinery bit that keeps things simple: correct fit, solid carbide construction, and the dimensions that matter for repeatable 5 mm Domino mortises.

• Who it's for: Woodworkers, cabinet builders, and finish carpenters using a Festool DF500 for smaller loose tenon joinery.
• Why it stands out: Solid carbide construction, spiral cut geometry, and clear DF500 compatibility make it more than a generic replacement.
• Worth knowing: This is a specialized Domino cutter, not a standard straight router bit for general router use.

• What machine is this bit designed for? It is listed for use with the Festool Domino DF500 jointing machine.
• What size mortise does it cut? The cutting diameter is 5 mm, making it suitable for 5 mm Domino-style slot cutting.
• What is the bit made from? CMT describes it as entirely made of solid carbide, with a black PTFE coating to help reduce buildup and overheating.
• What materials is it intended to cut? It is designed for routing slots in solid wood and wood composites.