Cordless Finally Caught Up to Pneumatic

For most of the last few decades, the answer to "cordless or air" for a real shop impact wrench was easy: air, every time. A compressor never runs out of charge, air tools are light, and pneumatic impacts have always hit harder for the money. That gap has genuinely narrowed. It hasn't closed.

Where cordless actually won

Brushless motors and high-output battery packs pushed premium 1/2" cordless impacts past 1,000 ft-lb of breakaway torque, which used to be air-tool territory. For field work, mobile repair, or anything away from a compressor line, that's not a close call anymore: a cordless impact with a couple of charged batteries does real work with zero setup, no hose to drag, and no compressor cycling in the background.

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  Milwaukee 2767-20 M18 Fuel High Torque 1/2" Impact Wrench

  Cordless high-torque impact wrench for lug nuts and stuck fasteners; bare tool for shops already on the M18 battery platform.

  $269.99

  View on Amazon→

Where air still wins, and why

The gap that's left shows up on sustained, repetitive work, not the first bolt. An air impact wrench pulls consistent torque from the first fastener to the five-hundredth because it's fed by a compressor, not a cell that's discharging. A cordless impact's torque output tapers as the battery drains through a long shift of wheel-offs or big fastener runs; you'll feel it slow down well before the pack reads empty.

Weight matters too. A pneumatic 1/2" impact putting out 1,000 ft-lb runs around 4 lbs. A cordless unit with comparable output, plus the battery, is commonly 6 to 8 lbs. That 2 to 4 lb difference doesn't feel like much for one bolt. Over an 8-hour shift of wheel-offs, it's the difference your wrist and shoulder actually notice by the end of the day.

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  Ingersoll Rand 231C 1/2" Drive Air Impact Wrench

  600 ft-lb air impact wrench for heavy fasteners on trucks and trailers, still the standard on shop air lines.

  $124.99

  View on Amazon→

The part that doesn't get talked about: battery platform lock-in

Going cordless isn't really a tool decision anymore, it's a battery platform decision. Once you own a stack of batteries and chargers for one brand's ecosystem, every future cordless tool purchase gets pulled toward that same brand, whether or not it's actually the best tool in that category. That's worth thinking about before buying the first cordless impact, not after you've got six batteries for a platform you're stuck with.

The honest answer

Cordless didn't beat pneumatic. It got good enough that for a lot of real-world work, the extra convenience outweighs pneumatic's remaining edge in raw sustained output and weight. If your day looks like nonstop heavy-duty fastener work in one spot, keep the air line. If it looks like moving between jobs, cordless is no longer the compromise it used to be.