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The Milwaukee M18 Fuel 3/8 in. Compact Impact Wrench is a battery-powered tool built around a Powerstate brushless motor that spins at 0-2,500 RPM and delivers up to 210 ft-lbs of fastening torque. Redlink Plus electronics manage current and heat to protect the motor and battery under heavy load. Its standout feature is One-Key: the tool pairs with a phone app to set torque and speed profiles for specific fasteners, store up to four profiles on the tool, and log its last known location. It suits mechanics and tradespeople who want a compact 3/8 in. wrench with app-level control; against simpler compact impact wrenches it trades some peak torque for tuning and tracking, and it sits in Milwaukee's M18 battery platform.
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Owners of Milwaukee's M18 Fuel compact impact wrenches generally rate the brushless motor and Redlink electronics highly for power in a small body, and One-Key users value saved profiles and tool tracking. The main complaints center on torque limits for stubborn fasteners and on One-Key requiring app setup.
The Milwaukee M18 Fuel 3/8 in. Compact Impact Wrench is a cordless tool with a Powerstate brushless motor. It delivers 0-2500 RPM and 0-210 ft-lbs of fastening torque, with constant power output under heavy load. Redlink Plus intelligence guards the tool and battery against damage from overloading or overheating.
The wrench works with the One-Key app, which connects to a smartphone wirelessly. The app has preset setups for specific fasteners and materials, or lets you control output speed and power yourself. Once you set the output, the custom profile is saved in the tool's memory and the phone connection is no longer needed. The tool stores up to 4 custom profiles, which you select with a button on the tool. Profiles are also saved in the cloud.
One-Key also tracks tools. The app records the last time a tool was within range, and anyone with the One-Key app can help find a lost tool. Devices within 100 ft. of your phone are compatible, and they can be tracked even if the battery is not charged or not on the tool.
