The Milwaukee 2864-20 M18 FUEL with ONE-KEY High Torque 3/4 in. Impact Wrench with Friction Ring Bare Tool is a cordless high torque impact wrench built for heavy fastening and bolt removal. This is a high torque impact wrench designed for loosening stubborn fasteners and driving large bolts in demanding service, construction, and industrial work. Model Number 2864-20. If you need serious output in a cordless platform, this tool is aimed at mechanics, ironworkers, utility crews, and contractors who regularly deal with seized or over-tightened hardware.

What makes this tool matter is the combination of size and output. Milwaukee rates it for up to 1,200 ft-lbs of fastening torque and 1,500 ft-lbs of nut-busting torque, which puts it firmly in heavy-duty territory. That gives you the force to handle lug nuts, anchor hardware, structural bolts, and rusted fasteners without stepping up to a larger corded impact wrench. The 0 to 1,800 RPM speed range and 0 to 2,400 impacts per minute give it enough speed to move from run-down to final tightening quickly, while still keeping it useful across different fastening tasks.

The Milwaukee 2864-20 M18 FUEL with ONE-KEY High Torque 3/4 in. Impact Wrench with Friction Ring Bare Tool is also notably compact for a tool in this class. At 8.6 inches in length, it is easier to fit between framing members, around heavy equipment components, and inside cramped service areas where longer high torque impact wrenches become awkward. That shorter head length is not just a spec on paper. It directly affects how often you can keep working instead of reaching for a breaker bar or changing your setup.

Milwaukee pairs that output with a POWERSTATE brushless motor and REDLINK PLUS intelligence. In practical terms, the brushless motor is there for efficiency, power, and long-term durability under repeated heavy loads. REDLINK PLUS is Milwaukee's electronic protection package that helps prevent overload and overheating damage to the tool and battery. For anyone who uses an impact wrench hard day after day, that matters because high torque tools spend a lot of time near the top of their operating range.

The 3/4 inch friction ring with thru-hole anvil is built for fast socket changes while still giving you added retention. That setup makes sense for crews who swap sockets often but still want the security of a thru-hole arrangement on critical jobs. Milwaukee also adds a built-in LED light, which is a small detail until you are working under a truck, inside a plant, or before sunrise on a jobsite. The premium rubber overmold is another practical touch, helping the housing hold up better around corrosive materials while improving grip and comfort.

ONE-KEY is a major part of why this model stands out from a basic cordless impact wrench. The tool wirelessly connects to a smartphone so you can customize, track, and manage performance and location. You can save up to four custom performance profiles directly to the tool's memory, then switch between them on the tool without needing the phone connected every time. For crews chasing repeatable torque ranges on common fasteners, that can reduce under-torque, over-torque, damage, and rework before final verification with a calibrated torque device.

Because this is a bare tool, it is intended for users already on the Milwaukee M18 battery platform. It is part of the M18 system, so it works with M18 batteries and fits into a larger cordless lineup if you are already running Milwaukee on the truck or in the shop. That makes it a strong buy for existing M18 users who want a heavy-duty impact wrench without starting over on batteries and chargers.

This impact wrench is best suited for serious fastening work, not light assembly. If your day includes suspension service, truck and fleet maintenance, steel erection, plant maintenance, pipe flange work, or heavy construction anchors, this is the right type of tool. If you only break loose occasional passenger car lug nuts, it is more tool than you need. But if stubborn fasteners are a normal part of your week, this is the kind of cordless impact wrench that earns its keep fast.

Big Output, Smarter Control

The Milwaukee 2864-20 is the kind of high torque impact wrench you buy when smaller models are costing you time.

• Who it's for: Pros working on trucks, heavy equipment, structural steel, industrial maintenance, and any job with large stubborn fasteners.
• Why it stands out: You get real heavy-duty torque, a short 8.6 inch body, and ONE-KEY profile control in one cordless package.
• Worth knowing: This is a bare tool, so plan on adding an M18 battery and charger if you are not already on the platform. It is also more impact wrench than the average light-duty user needs.

• Is this a cordless or corded impact wrench? It is a cordless impact wrench built on the Milwaukee M18 battery platform.
• Does this tool use ONE-KEY? Yes. It is ONE-KEY enabled for performance customization, tracking, and tool management.
• What size anvil does it use? It uses a 3/4 inch anvil with a friction ring and thru-hole design.
• How much torque does it produce? Milwaukee rates it at up to 1,200 ft-lbs of fastening torque and 1,500 ft-lbs of nut-busting torque.
• How many custom profiles can be saved in the tool? Up to four custom performance profiles can be stored in the tool memory.