The Milwaukee 2454-20 M12 FUEL 3/8 in Impact Wrench is a compact cordless fastening tool built for mechanics, service techs, installers, and contractors who need real torque without dragging around a larger mid-torque wrench. This is a cordless impact wrench designed for fastening and loosening nuts and bolts in tight spaces. Model Number: 2454-20.

What makes this tool matter is the balance of size and output. Milwaukee rates it at up to 1,400 in-lbs of peak torque, with a 0 to 1,200 / 0 to 2,650 RPM speed range and 0 to 3,500 impacts per minute. In plain terms, that means it has enough punch for a wide range of automotive, maintenance, and general fastening work while still being small enough to work around engine bays, equipment housings, and other cramped spots.

The compact format is a big part of the appeal. Depending on source, overall length is listed between about 5.75 in and 6.5 in, but all sources agree this is a short-body tool built to optimize access. At 2.0 lbs bare, it stays easy to control overhead or at awkward angles, and it is less tiring to use during repetitive bolt work than a bulkier wrench. The 3/8 in friction ring anvil keeps socket swaps quick, which is exactly what you want when you are moving between common service sizes.

Milwaukee uses its POWERSTATE brushless motor here, and that matters because brushless tools hold output more consistently under load and cut down on wear items inside the motor. Add in REDLINK PLUS intelligence, and the tool is managing communication between the tool, battery, and charger to help protect against overload, overheating, and over-discharge. That is the kind of feature you appreciate more the longer you own the tool.

For day-to-day jobsite use, Milwaukee also includes practical touches that actually help. There is an onboard fuel gauge so you can check battery status without guessing, and the built-in LED light helps when you are working under a vehicle, inside a mechanical room, or in any corner where overhead light is not doing much. These are small details, but they save time and frustration.

This impact wrench runs on the Milwaukee M12 battery platform, so it makes the most sense for users already invested in M12 batteries and chargers. If you already own M12 gear, this bare tool is an easy add. If you do not, remember that battery and charger are sold separately. That is not a drawback for existing Milwaukee users, but it is something a first-time buyer should know upfront.

Who should buy it? If you need a compact 3/8 in impact wrench for automotive service, equipment maintenance, general repair, or assembly work, this is one of the more practical formats Milwaukee makes. It is especially well-suited for users who want more speed and torque than a ratchet can provide, but do not want the bulk of a larger 18V impact wrench for every job.

Milwaukee 2454-20 M12 FUEL 3/8 in Impact Wrench punches above its size

If you want a compact impact wrench that is actually useful for real service work, this one hits the sweet spot.

• Who it's for: M12 users, mechanics, and contractors who need a compact cordless impact wrench for bolts and nuts in tighter areas.
• Why it stands out: The mix of 1,400 in-lbs of torque, brushless motor efficiency, and a short lightweight body makes it more versatile than a larger wrench for everyday carry.
• Worth knowing: This is a bare tool, so make sure you have an M12 battery and charger before it lands on your bench.

• What battery platform does this tool use? It is part of the Milwaukee M12 system and works with M12 batteries and chargers.
• Is this a brushless impact wrench? Yes. It uses a Milwaukee POWERSTATE brushless motor.
• What size socket drive does it use? It has a 3/8 in anvil with a friction ring for socket retention.
• Does it have variable speed control? Yes. It uses 2-Mode DRIVE CONTROL with RPM ranges up to 0 - 1,200 and 0 - 2,650 RPM.