The Festool Domino DF 500 Sipo Outdoor Tenons are solid hardwood floating tenons made for the Festool DF 500 joining system. This is a tenon accessory designed for mortise and tenon joinery in outdoor and exterior wood applications. Model Number 494869 gives you 300 Sipo tenons sized at 5 x 19 x 30 mm for repeatable, clean-fitting joints in projects where standard indoor beech tenons are not the right call.

What matters here is the material. Festool uses solid Sipo hardwood for strength and stability, and this version is intended for outdoor use in jobs like decks, exterior trim, gates, and outdoor furniture. If you're building anything that lives outside or sees changing humidity, the wood choice matters just as much as the fit. These tenons are made to handle that kind of work without becoming the weak point in the joint.

The DOMINO shape is a big part of why these work so well. Instead of a round dowel that can spin during glue-up, the flat elongated profile helps lock alignment in place. That makes edge joining and face joining easier to manage, especially when you're trying to keep parts flush during assembly. It also means less fighting the joint when you have multiple pieces to line up at once.

Festool also builds useful details into the tenon itself. The surface is embossed with glue pockets, which helps distribute adhesive more evenly in the mortise. Festool notes that the tenon is approximately 2 mm shorter than nominal length, leaving room in the mortise for glue. That sounds like a small detail, but it matters. You get less hydraulic pressure during assembly and a cleaner fit when you're clamping parts together.

These tenons are suitable for both plywood and solid wood applications. Festool specifically calls out that the dense Sipo material will not expand or telegraph through the material, helping you keep surfaces flat and clean after assembly. For cabinet parts, frames, rails, stiles, and exterior millwork, that kind of consistency is exactly what you want from a joinery accessory.

Compatibility is straightforward: this pack is made for the Festool DF 500. If that is your machine and you need a 5 mm DOMINO for outdoor woodworking or exterior trim joinery, this is the right fit. If you are not using a DF 500, this is not the pack to grab. Simple as that.

Who should buy these? Woodworkers, finish carpenters, cabinetmakers, and exterior trim crews already using the Festool DOMINO system will get the most out of them. They are especially useful for anyone building outdoor furniture, gates, deck details, or weather-exposed assemblies where a strong, well-aligned joint matters and indoor-only tenon stock is not the best choice.

Festool Domino DF 500 Sipo Outdoor Tenons for Clean Exterior Joinery

If you already run a DF 500 and build exterior projects, this is the tenon pack that makes sense.

• Who it's for: Woodworkers, trim carpenters, and cabinetmakers using a Festool DF 500 for outdoor furniture, exterior trim, gates, and similar joinery.
• Why it stands out: You get solid Sipo hardwood, a non-rotating DOMINO shape, and glue-pocket detailing that helps the joint go together cleanly.
• Worth knowing: This is an accessory pack, not a universal tenon. It is specifically sized for the DF 500 and sold as a 300-pack.

• Are these tenons made for outdoor use? Yes. Festool identifies the Sipo version as ideal for outdoor applications such as decks, exterior trim, gates, and outdoor furniture.
• Which joiner fits this tenon pack? This pack is suitable for the Festool DF 500.
• What size are the tenons? Each tenon measures 5 x 19 x 30 mm, which is also listed as 7/32 in x 1-3/16 in x 3/4 in.
• Can they be used in plywood as well as solid wood? Yes. Festool states they are suitable for both plywood and solid wood applications.