Hilti Nuron Cordless 1/2-Inch Impact Wrench Review SIW 6-22

Hilti Nuron 1/2-Inch Impact Wrench Drops Size And Weight But Not Performance

When Hilti translated their power class cordless impact wrench over to the Nuron line, they weren’t content to put an old tool in a new housing. We got our hands on the Hilti Nuron 1/2-inch impact wrench to see how it compares to its predecessor.


Much smaller and lighter than the previous version

Durable build

Shifts to a brushless motor

Now has 2 modes instead of 1

Purpose-built for construction applications

Excellent handle ergonomics

20-year warranty, 2-year free service, and 1-day turnaround on repairs


Lower torque levels than some premium brands’ mid-torque models

More expensive than some professional-grade options

Hilti Nuron Cordless 1/2-Inch Impact Wrench Performance

Hilti considers the SIW 6-22 part of their Power Class, reaching into the mid-torque range and taking advantage of a brushless motor. On paper, mode 1 nets you 1500 RPM and 221 ft-lbs of torque. Mode 2 kicks it up to 1750 RPM and 332 ft-lbs.

We turned to our Inertia Torque L-1000 impact tool torque tester to see what kind of working torque you can expect. Most impact wrenches we test hit between 65% and 85% of their listed torque and it gives you a more realistic idea of how much torque gets to the fastener. In Hilti’s case, mode 1 stabilized at 209 ft-lbs and mode 2 settled in at 267 ft-lbs.

Hilti Nuron Cordless 1/2-Inch Impact Wrench Review | SIW 6-22

So what is this tool a good fit for with those torque values?

You can certainly use it in automotive applications, but that’s not Hilti’s primary target. Looking to the construction industry, we see what they’re targeting.

Setting HUS anchors in concrete (8 to 14 mm, 5/16 to 9/16-inch)

Bolting steel (M10 – M20)

Setting lag bolts in wood (8 to 16 mm, 5/16 to 5/8-inch)

Of course, there are plenty of other applications, but these are some Hilti specifically designed the tool for.

Hilti Nuron Cordless 1/2-Inch Impact Wrench Design Notes


Picking the tool up, Hilti slimmed down the handle some and it’s a really comfortable design. It’s a bulky design, though. The Nuron battery has a slightly larger footprint than the previous 22V packs and it’s got some weight to it. Bare, the impact wrench weighs 4.0 pounds and the 4.0Ah battery puts the total at 5.7 pounds.

Hilti Nuron Cordless 1/2-Inch Impact Wrench Review | SIW 6-22

The positive is that it’s not way out of range for a mid-torque design, the balance is excellent with the 4.0Ah battery, and it has a very durable feel to the build. It also happens to be nearly a pound lighter and 2 inches shorter than the previous version (SIW 22T-A).

Additional Highlights

Hilti Nuron Cordless 1/2-Inch Impact Wrench Review | SIW 6-22

Variable speed trigger

Simple push-button mode selector

LED light

7 1/4-inch head length

Battery level indicator automatically comes on when you pull the trigger

Nuron technology offers better performance along with smart reporting capabilities

Hilti Cordless 1/2-Inch Impact Wrench Quick Comparison

Nuron SIW 6-2222V SIWT-AMotorBrushlessBrushedNo Load Speed1500/1750 RPM2000 RPMMax Torque221/332 ft-lbs332 ft-lbsImpact Rate3500 IPM2500 IPMBare Weight4.0 lbs4.8 lbsHead Length7.3 in9.1 in

Hilti Nuron Cordless 1/2-Inch Impact Wrench Price

As a bare tool, the Hilti SIW 6-22 runs $284 each, or $8.00 monthly if you’re using the Fleet Service program. The best battery for this model is the B 22-85 (4Ah) at $114 each. All Nuron batteries are compatible, but the smaller B 22-55 pack really limits your runtime and the larger packs make the tool awfully bulky.

The $39 C 4-22 charger is a great way to go, or you can snag the $84 C 6-22 if a fast charger is what you need.

As usual, Hilti’s 20-2-1 warranty applies to the Nuron impact wrench as well.

The Bottom Line

By adding a brushless motor and shifting to the Nuron platform, Hilti’s Power Class 1/2-inch impact wrench dropped some serious size and weight. While there are other options in the same size range with higher overall torque, this model is purpose-built for construction applications with a durable build to survive tough environments.

Discover more Hilti Nuron tools here.


Model: Hilti SIW 6-22

Power Source: Hilti Nuron 22V battery

No-Load Speed: 0 – 1500/1750 RPM

Max Torque: 221 ft-lbs (mode 1), 332 ft-lbs (mode 2)

Max Breakaway Torque: 478 ft-lbs

Impact Rate: 3500 IPM

Warranty: 20 years

Price: $284 bare tool