The Einhell IMPAXXO 18/400 is a heavy-duty 18V cordless impact wrench designed for the most demanding fastening tasks, especially in automotive, construction, and equipment maintenance. With a torque rating of 3,540 in-lbs (400 Nm), this impact wrench delivers the sheer power needed to remove rusted lug nuts, drive structural lag bolts, and handle tasks that typically require a pneumatic setup—all in a cordless, portable format. Powered by the Einhell PurePOWER brushless motor, the IMPAXXO 18/400 ensures longer runtime, increased durability, and consistent performance under load. Its 3-speed electronic control allows for torque and speed adjustments depending on your material, helping to prevent overtightening or hardware damage. The tool includes a 1/4″ bit adapter and a 3-piece impact socket set (17 mm, 19 mm, 21 mm)—ideal for tire changes, making it jobsite and garage-ready right out of the box.
With LED illumination, a rugged 1/2″ square drive, and full compatibility with the Einhell Power X-Change battery system, this tool is a powerful and flexible addition for professionals and skilled DIYers. For best results, use with a 4.0 Ah or higher battery (sold separately).
Einhell 18V 1/2″ Cordless Brushless Impact Wrench At a Glance
- Part of the Power X-Change Family: Compatible with 100+ Einhell cordless tools
- PurePOWER Brushless Motor: Longer runtimes, more torque, and extended tool life
- Very High Torque – 3,540 in-lbs (400 Nm): Perfect for loosening stubborn nuts or driving heavy-duty fasteners
- 1/2″ External Square Drive: Rugged and socket-ready for automotive and construction use
- Three-Speed Control: Adjust torque and RPM for material-sensitive applications
- LED Work Light: Brightens dark areas for safer and more accurate operation
- Includes 1/4″ Bit Adapter: Adds versatility for general screwdriving tasks
- Includes 3-Piece Impact Socket Set: 17 mm, 19 mm, and 21 mm sockets for car tire and wheel service
- Durable Build with Comfortable Grip: Designed for professional daily use
- Recommended Battery: 4.0 Ah or higher (sold separately)
- Battery and Charger Sold Separately
Markets
- Automotive & Fleet Maintenance Excellent for tire rotations, lug nut removal, and engine mount hardware
- Construction & Framing Professionals Easily drives large lag bolts or heavy fasteners into treated lumber or steel
- Heavy Equipment & Machinery Technicians Cordless convenience for field repairs or mobile service work
- Agricultural Equipment Maintenance Breaks loose stuck bolts and nuts on tractors, trailers, and implements
- DIY Mechanics & Power Tool Enthusiasts A go-to solution for those upgrading from hand tools or air-powered setups
- Users with Power X-Change Systems Expand your tool capabilities without needing new batteries or chargers
High-Torque | Brushless Power | Perfect for Wheel Changes & Heavy Fastening. The Einhell IMPAXXO 18/400 is built for users who need serious torque in a cordless format—without the noise, setup time, or maintenance of air tools. Whether you’re removing lug nuts, securing post anchors, or assembling steel framing, this tool gives you the freedom to work anywhere with confidence, consistency, and convenience. With 400 Nm of torque and three adjustable speed modes, this tool transitions easily from high-strength fasteners to more delicate tightening work. It’s a top pick for mechanics, fleet maintenance, and contractors who demand reliability but want to ditch compressors and cords. Thanks to its brushless motor and Power X-Change compatibility, you also gain the benefits of long-lasting battery power and platform-wide flexibility.
Einhell 4510071 18V 1/2″ Cordless Brushless Impact Wrench, IMPAXXO 18/400 – Tool Only Features
- Member of the Power X-Change family
- Brushless motor – more power and longer runtimes
- Very high torque for easy loosening of wheel nuts
- Robust 1/2″” (13 mm) external square drive mount
- LED light to illuminate the work area
- 3 speed settings for a perfect speed adjustment
- Complete with 1/4″” (6.35 mm) bit adapter for screw driving
- Complete with a 3 pc. socket set for car wheel changing sizes: 17 mm, 19 mm, 21 mm (11/16″”, 3/4″”, 13/16″”)
- Includes 1/4″” bit adapter and 3 impact sockets (17, 19, 21 mm – 11/16″”, 3/4″”, 13/16″”)
- Recommended battery for maximum results: 4.0 Ah battery
- Battery and charger sold separately
Einhell 4510071 18V 1/2″ Cordless Brushless Impact Wrench, IMPAXXO 18/400 – Tool Only Includes
- IMPAXXO 18/400 Impact Wrench Tool (Bare Tool)
- 1/4″ Bit Adapter
- 3 Impact Sockets (17 mm, 19 mm, 21 mm)
- Battery and charger sold separately
Einhell 4510071 18V 1/2″ Cordless Brushless Impact Wrench, IMPAXXO 18/400 – Tool Only Specifications
- Motor Voltage: 18V
- Motor Type: Brushless
- Number of Gears: 3
- No Load Speed: 0–2,100 RPM
- Impact Rate: 0–3,300 IPM
- Max Torque: 3,540 in-lbs (400 Nm)
- Drive Type: 1/2″ Square (13 mm)
- Hex Adapter: 1/4″ (6.35 mm) included
- Socket Sizes Included: 17 mm (11/16″), 19 mm (3/4″), 21 mm (13/16″)
- Product Weight: 4.4 lbs
- Item Number: 4510071
- EAN: 772995019052
Einhell 4510071 18V 1/2″ Cordless Brushless Impact Wrench, IMPAXXO 18/400 – Tool Only Warranty
- Einhell’s 2 year warranty with an extended year if you register your machine online and 10 Year warranty on brushless motors.
Why Customers Choose the Einhell 18V 1/2″ Cordless Brushless Impact Wrench
The IMPAXXO 18/400 is chosen for its exceptional torque-to-weight ratio and jobsite-ready versatility. It delivers the power of a pneumatic impact without the bulk or dependence on air compressors. Users appreciate the three-speed control, especially when shifting between high-torque removal and sensitive installation jobs. Whether you’re servicing vehicles, building decks, or driving anchors into masonry, this tool does the job—cord-free and stress-free.
Often searched under “cordless impact wrench for lug nuts,” “high torque impact wrench,” or “1/2 inch battery-powered torque wrench,” the IMPAXXO 18/400 remains a top-tier choice for professionals and DIYers who demand more torque, less hassle, and longer tool life.
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