Car and garage · Comparison
Cordless impact wrenches for lug nuts: which torque figure to read
You want to swap wheels or rotate tires at home without fighting the lug nuts with a breaker bar. How much impact wrench do you need, and which current DEWALT and Milwaukee models fit the job? This page explains which torque figure matters for lug nuts and compares five tools on it.
Quick picks
Who each model fits, judged on this page's criteria. Full figures and the reasons to skip each one are further down.
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DEWALT 20V MAX XR 1/2 in. impact wrench (DCF892B)
Regular wheel and tire work at home on DEWALT 20V MAX batteries, from a listing that states both a tightening and a removal figure.
- Platform 20V MAX
- Drive or chuck size 1/2"
- Max torque (as listed) 600 ft-lb
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DEWALT 20V MAX XR high-torque 1/2 in. impact wrench (DCF900B)
Trucks, trailers and rusted hardware where removal torque is the hard part.
- Platform 20V MAX
- Drive or chuck size 1/2"
- Max torque (as listed) 1,030 ft-lb
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DEWALT ATOMIC 20V MAX 1/2 in. compact impact wrench (DCF921B)
Light-duty wheel work and general fastening where a short, light tool matters.
- Platform 20V MAX
- Drive or chuck size 1/2"
- Max torque (as listed) 300 ft-lb
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Milwaukee M12 FUEL stubby 1/2 in. impact wrench (2563-20)
You already own M12 batteries and want a short tool for wheels and suspension work; Milwaukee states its removal figure.
- Platform M12
- Drive or chuck size 1/2"
- Breakaway torque (as listed) 550 ft-lb*
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Milwaukee M18 FUEL 3/8 in. compact impact wrench (2854-20)
M18 owners who want one compact wrench for general automotive work, with a removal figure the listing states.
- Platform M18
- Drive or chuck size 3/8"
- Breakaway torque (as listed) 250 ft-lb
On this page
What we compared and why
- Removal (breakaway) torque. Taking a lug nut off needs more torque than putting it on, especially when it has rusted or been over-tightened. Listings that give a breakaway or nut-busting figure tell you most about removal.
- Drive size. 1/2-inch drive is common for lug nut sockets. A 3/8-inch tool needs an adapter or a different socket set.
- Weight and size. Compact and stubby tools reach into tight wheel wells and weigh less on long jobs; high-torque tools are heavier.
- Battery platform. Every model here is sold as a tool only. If you already own batteries for one platform, that platform's wrench needs no new battery or charger.
The models compared
| Model | Platform | Drive or chuck size | Max torque (as listed) | Breakaway torque (as listed) | Sold as | Amazon link |
|---|---|---|---|---|---|---|
| DEWALT 20V MAX XR 1/2 in. impact wrench (DCF892B) | 20V MAX | 1/2" | 600 ft-lb | 800 ft-lb | Tool only | See on Amazon |
| DEWALT 20V MAX XR high-torque 1/2 in. impact wrench (DCF900B) | 20V MAX | 1/2" | 1,030 ft-lb | 1,400 ft-lb | Tool only | See on Amazon |
| DEWALT ATOMIC 20V MAX 1/2 in. compact impact wrench (DCF921B) | 20V MAX | 1/2" | 300 ft-lb | 450 ft-lb* | Tool only | See on Amazon |
| Milwaukee M12 FUEL stubby 1/2 in. impact wrench (2563-20) | M12 | 1/2" | Not stated in listing | 550 ft-lb* | Tool only | See on Amazon |
| Milwaukee M18 FUEL 3/8 in. compact impact wrench (2854-20) | M18 | 3/8" | Not stated in listing | 250 ft-lb | Tool only | See on Amazon |
Table values are read from each product's current Amazon listing at the time of this page's build and normalised to one unit by us. "Not stated in listing" means the listing does not give the figure; "Listing gives two values" means the listing states it two different ways, so we show neither. Values marked * come from the maker's own spec page, linked under Sources.
DEWALT 20V MAX XR 1/2 in. impact wrench (DCF892B)
Who it fits: Regular wheel and tire work at home on DEWALT 20V MAX batteries, from a listing that states both a tightening and a removal figure.
Skip it if: You work in tight spaces most of the time; a compact model is shorter and lighter.
DEWALT 20V MAX XR high-torque 1/2 in. impact wrench (DCF900B)
Who it fits: Trucks, trailers and rusted hardware where removal torque is the hard part.
Skip it if: You only rotate car tires; this is far more tool, and weight, than that job needs.
DEWALT ATOMIC 20V MAX 1/2 in. compact impact wrench (DCF921B)
Who it fits: Light-duty wheel work and general fastening where a short, light tool matters.
Skip it if: Your lug nuts are often rusted on; its stated removal figure is the lowest of the 1/2-inch tools here.
Milwaukee M12 FUEL stubby 1/2 in. impact wrench (2563-20)
Who it fits: You already own M12 batteries and want a short tool for wheels and suspension work; Milwaukee states its removal figure.
Skip it if: You want one battery platform for larger 18V and 20V tools too.
Milwaukee M18 FUEL 3/8 in. compact impact wrench (2854-20)
Who it fits: M18 owners who want one compact wrench for general automotive work, with a removal figure the listing states.
Skip it if: You want to use 1/2-inch lug nut sockets without an adapter.
The figure that matters for lug nuts
Your vehicle maker sets how tight the lug nuts should be, in the owner's manual. That tightening figure is not what limits a home mechanic. The hard part is taking a nut off that has rusted, or that a shop over-tightened with an air tool. That is why the table separates two figures:
- Max torque (as listed): the figure a listing gives for tightening, or its plain maximum.
- Breakaway torque (as listed): the figure for loosening a stuck fastener, often called nut-busting torque.
Makers measure these two differently, so never compare one tool's breakaway figure with another tool's tightening figure. Where a listing gives only one kind, the other cell says "Not stated in listing".
Tighten with a torque wrench
An impact wrench is the fast way to take nuts off and to run them down. For the final tightening, use a torque wrench set to the figure in your owner's manual, working across the wheel in a star pattern. An impact wrench can easily go past the specified torque, and over-tightened lug nuts are the ones that are hard to remove next time.
Compact or high torque
Compact and stubby tools fit behind wheels and between suspension parts, and they weigh less. High-torque tools remove the worst rusted hardware but are heavier and longer. For rotating tires on a car, a compact or mid-size 1/2-inch tool is a common choice; for trucks and trailers, look at the removal figure first.
What this page does not tell you
We have not used these tools on our own cars, and we do not rank them; this comparison is research-based. We give no lug nut torque figure for your vehicle: take it from your owner's manual. Values marked * in the table come from the makers' pages listed under Sources. For converting ft-lb, in-lb and Nm, see torque units explained.