Milwaukee's M18 platform is the one a lot of buyers already own batteries for, which makes the M18 Fuel impact wrench the default add rather than a fresh decision. That is a reasonable way to shop, but it skips a real question: how does the M18 Fuel actually perform once it is timed against a wrench, not just against its own spec sheet?
A hands-on bench test ran 13 cordless impact wrenches through the same torque and speed gauntlet, and the Milwaukee M18 Fuel was one of two Milwaukee entries in the field. Here is exactly where it stood.
What the testing showed
The numbers below come from Project Farm, who bought 13 cordless impact wrenches, including both a Milwaukee M18 Fuel and a Milwaukee M12 Fuel, and ran every one through the same five tasks. The full breakdown is on the 13-wrench impact wrench comparison, and every figure here traces to that video. No single overall winner was formally declared in this test; both Milwaukee entries and two other brands finished at the top of different individual categories.
Each wrench was measured on claimed torque and idle sound, looseningtorque on a 3/4 inch bolt (measured as actual clamp load), a 30-second lag bolt drive test, and two timed lag bolt tasks, driving and extraction.
The M18 Fuel is the most compact wrench in the field
At 4.8 inches in length, the M18 Fuel was noted as "very compact" relative to the rest of the 13-wrench field, an advantage in tight engine bays or wheel wells where a longer wrench cannot fit. It runs 156 dollars for just the impact wrench, without a battery or charger.
It led early on torque, then was overtaken
The M18 Fuel claims up to 250 foot-lb of nut-busting torque. On the looseningtorque test, it produced 227 foot-lb of measured clamp load (19,410 lb clamp load converted), which moved it into the lead at that stage of testing. On the 30-second lag bolt drive test, it produced strong early results with visible smoke from the driven screw and briefly held the lead at 6.25 inches of progress.
The test's own notes are direct about what happened next: the M18 Fuel was "later surpassed by DeWalt Atomic, Flex, and Milwaukee M12 Fuel" as those wrenches came through the rest of the lineup. By the end of testing, Milwaukee's own M12 Fuel had posted the single best looseningtorque number of all 13 wrenches at 341 foot-lb, well above the M18 Fuel's 227 foot-lb, and tied with Flex for the best overall average finish on the scorecard.
Weight and noise were middle of the pack
The M18 Fuel was the heaviest wrench in the lineup at the point it was tested, 4.02 lb, and posted 90 decibels at idle, on the louder end of the field. The test describes it as hitting hard, calling it "a real hand shaker" once it got going on the looseningtorque test.
How to read this for your own purchase
The honest read on the M18 Fuel is that it is a genuinely compact, hard-hitting wrench that led early in this test before other brands, including Milwaukee's own M12 Fuel, pulled ahead on the harder tasks.
If you already own M18 batteries and need a wrench primarily for its small size in tight spaces, the M18 Fuel's compact length is a real, tested advantage worth keeping in mind, even though its raw torque numbers finished behind the field leaders.
If raw looseningtorque is the priority and you are open to a different Milwaukee platform, the M12 Fuel from the same brand posted the single best looseningtorque number of all 13 wrenches tested, and it did so while being the lightest wrench in the field. That is worth knowing before assuming M18 is automatically Milwaukee's top-performing wrench line.
If lag bolt driving speed matters more than raw looseningtorque, DeWalt Atomic and Flex both out-timed the M18 Fuel on the lag bolt tasks in this test.
It is worth remembering that this 13-wrench field spanned prices from well under 100 dollars up to the 746 dollar Snap-on, and the M18 Fuel's 156 dollar price sits closer to the affordable end of that range while still delivering results competitive with wrenches costing far more, even where it ultimately finished behind the strongest performers.
A few rules that apply regardless of which Milwaukee wrench you pick:
- A dedicated lag bolt mode makes a measurable difference. Wrenches without one, including the M18 Fuel, moved into the lead on early stages of the lag bolt test but were passed by wrenches with purpose-built wood-fastener settings.
- Compact size and top torque are often a trade-off. The M18 Fuel's short length came with a middling looseningtorque number relative to the field leaders.
- Battery platform loyalty is a legitimate reason to buy, but know what you are giving up in raw numbers if you stick with one line over a stronger performer from a different brand or platform.
Browse the rest of the power tools tested this same hands-on way for drills, drivers, and grinders put through comparable head-to-head testing.