Cordless Impact Wrenches: 1/2

1/2" impact wrenches are designed for wheels and M12–M24 nuts, 3/8" for compact work in the engine bay, and 1/4" hex impact drivers for long screws and small fasteners. Professional models withstand daily heavy use. See differences between professional and household power tools.

Impact drivers usually deliver 150–250 N·m, compact 1/2" impact wrenches 300–600 N·m, and high-torque models 800–1500 N·m or more. 400–600 N·m is enough for wheels, while seized nuts require a reserve. Read torque (N·m).

Use only impact-rated (black, CrMo) sockets with the matching square drive, as regular chrome sockets can crack. Pay attention to how the socket is held — by a hog ring or a detent pin. More: how to choose an impact socket.

Most impact wrenches run on an 18–20 V platform, while high-torque models need a 4–6 Ah battery to supply peak current. A 2 Ah battery makes the tool lighter but can reduce maximum torque. See cordless tool voltage (V) and battery capacity (Ah).

In impact tools a brushless motor provides higher torque, longer runtime and several speed modes, including auto-stop when loosening a nut. Read brushed and brushless motor.

If you already own batteries for the same platform, choose a body-only version; for a first purchase, choose a kit with a 4 Ah battery and a fast charger. More: what is a unified battery platform and how to choose a battery and charger.

Do the final tightening of wheel nuts with a torque wrench, hold the tool firmly and wear safety glasses. Remove the battery before changing the socket. Read how to use cordless tools safely.