The Festool 769126 Depth Stop Chuck DC UNI FF is a depth stop chuck for compatible Festool drills and percussion drills with FastFix tool reception. This is a depth stop chuck designed for controlled screw driving with repeatable depth. Model Number 769126. If you are fastening facade screws, patio screws, or other hardware where overdriving ruins the result, this attachment gives you a more consistent stopping point than trying to feather the trigger and clutch alone.

What makes this accessory useful is the way it turns a compatible drill into a more controlled fastening setup. The 1/10 mm depth adjustment lets you fine tune how far the fastener is driven, which is the kind of detail that saves rework when you are running a lot of screws in visible surfaces or softer material. Festool also calls out that this version accommodates fasteners with a washer head, so it is aimed at jobs where a standard depth stop setup may not be the right fit.

The Festool 769126 Depth Stop Chuck DC UNI FF uses the FastFix holder, so it is built around Festool's quick-change system rather than being a generic add-on. That matters because a fastening accessory is only useful if it goes on and off fast enough to earn a place in your workflow. On a job where you are switching between pilot holes, self-drilling screws, and final fastening, a dedicated FastFix attachment keeps the process cleaner and more predictable.

Festool equips this chuck for real fastening work, not just light duty trim tasks. It uses a standard 1/4 inch hex bit interface and includes an 8 mm socket end for self-drilling screws. Festool lists it as ideal for facade and patio screws, and the maximum screw size in softwood is 6 mm x 4" (100 mm). In plain terms, that means it is aimed at exterior and structural-style screw driving where controlled depth and repeatability matter more than raw speed alone.

The exchangeable stop sleeves are a practical part of the design. Different screw heads and fastening applications need different contact at the nose, and the included 11/16" and 7/8" (17 and 23 mm) sleeves give you options without forcing a one-size-fits-all setup. That is especially helpful when you are dealing with washer-head or specialty screws where the wrong nose setup can mark the surface or stop inconsistently.

Compatibility is the big buying decision here. Festool states this attachment is suitable for all Festool cordless drills, cordless percussion drills, drills, and percussion drills with FastFix tool reception, except the DR 20 and DRP 20. It is also described as the depth stop chuck variation for the PDC drill, and Festool notes that the standard Depth Stop Chuck 493539 does not work with the PDC Drill. So if you specifically need a PDC-friendly depth stop solution, this is the version you want to be looking at.

Who should buy it? This accessory makes the most sense for Festool users who already work inside the FastFix system and need better screw depth control for repeated fastening. Deck builders, exterior remodelers, installers working with facade screws, and anyone trying to get more consistent results from a compatible Festool drill will get the value. If you are not on a Festool FastFix drill platform, this is not the accessory to force into your setup. But if you are, it is a smart way to get cleaner, more repeatable fastening without stepping up to a dedicated single-purpose screw gun.

Festool 769126 Depth Stop Chuck DC UNI FF is the right add-on when clean, repeatable screw depth matters

This is the kind of accessory that makes a compatible Festool drill more useful on real fastening work, especially when washer-head or exterior screws need to stop in the same place every time.

• Who it's for: Festool users running compatible FastFix drills for patio, facade, deck, or other repeated screw driving work.
• Why it stands out: Fine depth adjustment, FastFix compatibility, and the ability to work with washer-head fasteners make it more specialized and more useful than a basic screw driving setup.
• Worth knowing: This is an accessory for the Festool system, not a universal chuck. Make sure your drill has FastFix reception and note that DR 20 and DRP 20 are excluded.

• What kind of tool is this? It is a depth stop chuck for compatible Festool drills and percussion drills with FastFix tool reception.
• Will it work with the Festool PDC drill? Yes. This is described as the PDC depth stop chuck variation, and Festool notes that the standard Depth Stop Chuck 493539 does not work with the PDC Drill.
• What bit type does it use? It uses standard 1/4 inch hex bits and also includes an 8 mm socket end for self-drilling screws.
• What is the maximum screw size in softwood? Festool lists the maximum screw size for softwood as 6 mm x 4" (100 mm).