Impact Wrench vs Impact Driver: Which One Do You Actually Need?

They sit next to each other in the store, cost about the same, and look close enough that plenty of people buy the wrong one. Then they try to take a wheel off and wonder why nothing moves.

The short answer

An impact wrench has a square drive — usually 1/2 inch — that sockets push onto. It makes a lot of torque and it exists to undo and tighten nuts and bolts. Wheels, suspension bolts, rusted machinery.

An impact driver has a 1/4 inch hex collet that bits click into. It makes far less torque but far more speed, and it exists to drive screws without stripping the head or snapping the shaft.

Same idea inside — both add rotational hammer blows to help break friction — aimed at completely different jobs.

How much torque does a lug nut actually take?

Most passenger cars specify somewhere around 80 to 100 ft-lbs to tighten a wheel nut. That number is not the one that matters when you're trying to get it off.

A nut that's been on for three winters, corroded into place, and last tightened by someone at a tyre shop with an air gun, can need several times its spec torque to break loose. This is why a tool rated at 150 ft-lbs sounds like plenty on paper and then does nothing in your driveway.

The figure you want to look at is breakaway torque — what the tool can produce to loosen something, not to tighten it. More headroom than you think you need is the right call, because the day you need it is the day you're on the side of a road.

One warning that matters: never use an impact wrench to do the final tightening on your wheels. Run the nuts up with the wrench, then finish with a torque wrench to the manufacturer's spec. Over-tightening stretches studs, warps brake rotors, and turns your next flat tyre into a problem you can't solve with the tools in your boot.

What each one is genuinely good at

Reach for an impact wrench when: changing wheels, taking off suspension or exhaust bolts, freeing rusted bolts on a mower or trailer, assembling anything with lag bolts.

Reach for an impact driver when: building a deck, hanging drywall, driving long screws into studs, assembling flat-pack, anything where a drill would stall or chew the screw head.

And a plain drill still wins for one thing: drilling holes, and any job where you need to control depth precisely. An impact tool's hammering makes fine control harder.

Brushless, and whether it's worth caring about

Yes, and for a practical reason rather than a marketing one. A brushless motor has no carbon brushes to wear out, so it runs cooler, lasts longer, and converts more of the battery into work rather than heat. In a tool that spends its life hammering, that's the difference between one that's still working in five years and one that isn't.

Do you need both?

Most people don't want two more tools in the garage. That's the case for a 3-in-1: the same brushless body with the head swapped between an impact wrench, a drill and a screwdriver.

The TorquePro 3-in-1 Cordless Power Tool does that job — 550 N·m (406 ft-lbs) of breakaway torque, three speeds, a built-in LED for working under a car, two 4.0Ah batteries so you don't stop halfway, and sockets, drill bits and a hard case in the box.

$119.99, free US shipping, a 30-day money-back guarantee and a 12-month warranty.

Wrench for nuts, driver for screws, drill for holes. And always finish your wheels with a torque wrench.