Key Features
Drive Near EdgesThis eccentric chuck moves the bit flush to the side so you can drill and drive where a standard drill chuck runs out of room. That matters for cabinet hardware, corner fasteners, and work tight against walls or case sides.FastFix SwapThe FastFix interface lets you change from one attachment to another in seconds. Less time changing setups means less reaching for a second drill just to finish one awkward fastener.Quick Angle ControlYou can adjust the working angle by rotating the green ring without taking the attachment off the drill. That makes it easier to line up the bit exactly where you need it in confined spaces.
Overview
The Festool 205223 Eccentric Attachment EX-UNI is an eccentric chuck attachment built for drilling and screwdriving close to edges and adjacent surfaces. This is an eccentric chuck designed for close-quarters fastening and drilling with compatible Festool cordless drill/drivers. Model Number: 205223. If you install hardware inside cabinets, work in corners, or need to place screws tight to a wall or side panel, this attachment solves a real clearance problem that a standard chuck cannot.
The big reason this attachment matters is bit position. Instead of centering the bit in front of the drill body, the EX-UNI offsets it so the screw can sit nearly flush to an obstruction. In practical use, that means cleaner access for kitchen installation, hinge work, furniture assembly, and general finish carpentry where standard drill drivers get blocked by cabinet sides, drawer hardware, or inside corners.
Festool built the EX-UNI to work as part of the FastFix system, so you can switch between attachments quickly instead of carrying separate specialty tools for occasional tight-access jobs. That saves setup time and keeps the tool you already know in your hand. The angle can be adjusted by rotating the green ring, and the attachment does not need to be removed from the drill just to reposition it. That is a small feature on paper, but on the job it makes a difference when you are trying to sneak onto a fastener without losing your working position.
The design is also practical around finished surfaces. According to the product information, the quick-release collar will not mar adjoining surfaces, which is a useful detail for cabinet boxes, installed trim, and hardware work where the tool body gets close to visible material. Festool also notes that the chuck rotates 360 degrees, giving you more freedom to clock the bit where the drill body has the best clearance.
Compatibility is the other key part of this product. The EX-UNI connects directly to the output shaft of compatible Festool drills with a FastFix holder or FastFix interface. It is intended for the Festool TPC 18/4, TDC 18/4, and Festool C and T cordless drill/drivers with FastFix mounting. Source data also states it works with existing and previous model Festool drills equipped with FastFix for toolless chuck changes. The important limitation is that it is not suitable for the CXS/TXS according to Festool product data for this listing.
For real buyers, this is not the attachment you purchase because it looks interesting in a drawer. You buy it because you routinely hit the same problem: the screw is in the right spot, but the drill cannot get there straight. If that sounds familiar, the Festool 205223 Eccentric Attachment EX-UNI is the right specialty accessory for cabinet installers, furniture builders, remodelers, and finish carpenters already running compatible Festool drill platforms.
Reach Fasteners a Standard Chuck Cannot
This is where an offset attachment earns its keep. The bit sits close to the side of the drill so you can drive screws next to cabinet walls, inside cases, and around installed hardware without coming in at a bad angle.
- Built for drilling and screwdriving close to edges
- Useful for kitchen installation, hinge mounting, furniture building, and assembly work
Adjust the Angle Without Breaking Your Setup
The green ring lets you clock the attachment to the position you need without pulling it off the drill. That speeds up repetitive installation work and makes it easier to keep control when the access is already tight.
- Quick angle adjustment by rotating the green ring
- FastFix connection supports quick, tool-free attachment changes
What’s in the Box
- (1) Festool Eccentric Attachment EX-UNI
Key Specifications
| Tool Type | Eccentric Chuck Attachment |
|---|---|
| Model Number | 205223 |
| Weight (lbs) | 0.88 lbs |
| Max. Screw Size for Softwood | 1/4 in x 11-13/16 in (6 x 100 mm) |
| Interface | FastFix |
| Compatible Drill Families | Festool C and T cordless drills with FastFix, plus TPC 18/4 and TDC 18/4 |
| Made In | Czech Republic |
| Package Contents | Eccentric Attachment |
Compatibility
FastFix InterfaceDesigned for Festool drills equipped with the FastFix holder or FastFix interface for toolless chuck changes.Compatible Drill ModelsSuitable for Festool TPC 18/4, TDC 18/4, and Festool C and T cordless drill/drivers with FastFix mounting.Bit and Accessory FitUses a quick-release style connection and is intended for screwdriving and drilling accessories used with compatible Festool drill systems.Not CompatibleFestool product data for this listing states the EX-UNI is not suitable for CXS/TXS.
Built For
Cabinet InstallationKitchen FittingHinge MountingFurniture AssemblyFinish CarpentryRemodelingTight-Space FasteningClose-Edge Drilling
Pro Tip
Before you drive the fastener, rotate the EX-UNI so the bulk of the attachment is clocked away from the obstruction. It is the quickest way to get full bit engagement in a cabinet corner without cam-out or scraping the surface next to the screw.
Tool Nut’s Take
Tool Nut’s Take
Festool 205223 Eccentric Attachment EX-UNI is a niche tool that pays for itself fast
If you own a compatible Festool drill and regularly install hardware or build cabinets, this attachment fixes one of the most annoying access problems on the job.
- Who it’s for: Cabinet installers, finish carpenters, furniture builders, and remodelers working in tight interiors and corners.
- Why it stands out: The offset bit position, FastFix swap, and on-tool angle adjustment make it faster and cleaner than fighting a standard chuck in cramped spaces.
- Worth knowing: This is a purpose-built accessory, not a general-use chuck. It makes the most sense if you already run compatible Festool C or T drills, TPC 18/4, or TDC 18/4.
Common Questions
- What is this attachment used for? It is used for drilling and screwdriving close to edges, walls, corners, and other adjacent surfaces where a standard drill chuck cannot fit well.
- Does it require a compatible Festool drill? Yes. It is designed for Festool drills with the FastFix interface, including TPC 18/4, TDC 18/4, and Festool C and T cordless drills with FastFix mounting.
- Can you adjust the attachment angle while it is on the drill? Yes. The angle is adjusted by rotating the green ring, and the attachment does not need to be removed from the drill for that change.
- Is it suitable for CXS or TXS drills? No. Festool product data for this listing states it is not suitable for CXS/TXS.
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