Not every job calls for a high-torque impact wrench. Sometimes you just need enough power to break loose stubborn fasteners without lugging around a larger, clunky tool. That’s where the Greenworks Pro 3/8-Inch Impact Wrench earns its place.
Greenworks takes that approach seriously, pairing a smaller form factor with intuitive tech that doesn’t break the bank. I got some hands-on time with the IW5370 and discovered it’s much more than just easy on the wallet. But is it the right choice for you? Let’s find out.
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Greenworks Pro 3/8-Inch Impact Wrench Performance
Speed and Power
At the heart of the IW5370 is a brushless motor that delivers up to 2,500 RPM and 3,600 IPM. Greenworks also rates this impact wrench for up to 400 ft-lbs of breakaway torque and 270 ft-lbs of fastening torque, placing it firmly into the compact impact-wrench category. This gives it plenty of muscle for a wide range of automotive, mechanical, and maintenance work applications.
It sports three main speed settings, which prove useful when you need to regulate power. Greenworks lists them at 150, 300, and 400 ft-lbs, giving you progressively more output as needed.
That range is important because you don’t always want or need maximum power. Smaller fasteners can be easy to overdrive with an impact wrench, and having multiple settings gives you a better chance of keeping the tool under control.
For general automotive work, the 3/8-inch drive also hits a useful sweet spot. It’s smaller than a 1/2-inch wrench, but still gives you considerably more power than a typical cordless ratchet or even some of the earlier cordless compact impact wrenches we tested.
Auto Mode
In addition to the three standard modes, Greenworks also gives the IW5370 an automatic mode, which adds another layer of control while removing nuts and bolts.
Auto Mode is designed to help prevent the wrench from continuing to spin away at high speed once a fastener breaks loose. That’s particularly useful when you’re removing nuts and bolts that are already under significant load. Rather than continuing to zip the fastener off, the automatic function helps control the run-off once the fastener is loose.
It’s the kind of feature that doesn’t necessarily show up in a torque specification, but it can make an impact wrench easier to use when you’re working around vehicles and machinery.
Work Light Mode
One slick feature on this impact wrench is the LED work light mode. You can activate the LEDs surrounding the anvil with the press of a button, essentially turning this impact wrench into a flashlight. Once the button is pressed, the lights will stay on for ten minutes before shutting off automatically. The light will also activate when the trigger is pulled and stays illuminated for ten seconds after the trigger is released.
This is very similar to what we saw on the DeWalt DCF860 and DCF870 impact drivers. This is especially handy if you’re working in tight spaces, need minimal light for small jobs, or don’t want to lug around an extra light.
It’s a small feature, but it’s extraordinarily helpful in the right circumstances.
Greenworks 24V Pro Impact Wrench Comparison
The IW5370 sits below Greenworks’ 1/2-inch IW5550 in both size and output. Stepping up to the mid-torque class, the IW5550 offers up to 560 ft-lbs of breakaway torque if you’re willing to trade off a little size and weight. The IW5800 (750 ft-lbs) and IW51500 (1430 ft-lbs) are also available for applications that require substantially more power.
That gives Greenworks a fair amount of breadth in this category.
The IW5370 makes sense when compact size and moderate power are the main priorities. However, the IW5550 steps things up when you need more muscle without moving all the way to a beefy high-torque model.
Here’s a quick look at how these two smaller impacts compare on paper:
| IW5370 | IW5550 | |
|---|---|---|
| Max No-Load Speed | 2,500 RPM | 2,400 RPM |
| Breakaway Torque | 400 ft-lbs | 560 ft-lbs |
| Impact Rate | 3,600 IPM | 3,400 IPM |
| Working Weight | 3.7 lbs | 3.9 lbs (w/2.0Ah battery) |
| Head Length | 5.0 in. | 5.75 in. |
| Price | $79.99 (bare tool) | $89.99 (bare tool) |
Not every impact-wrench application needs maximum output, and choosing a smaller tool when the job allows it makes the work more comfortable. That said, 400 ft-lbs is a very capable range for most automotive applications, but it’s nice to know that Greenworks has a range of power options available on their 24V platform should the need arise.
Greenworks vs Pro Competition
The comparison above is helpful in choosing which Greenworks 24V Pro impact wrench is right for you, but how does it compare to other Pro brands?
| Greenworks 24V Pro IW5370 | Milwaukee M18 Fuel 2854 | DeWalt 20V Max Atomic DCF923 | |
|---|---|---|---|
| Max No-Load Speed | 2,500 RPM | 2,400 RPM | 2,500 RPM |
| Fastening Torque | 270 ft-lbs | Not listed | 300 ft-lbs |
| Breakaway Torque | 400 ft-lbs | 250 ft-lbs | 450 ft-lbs |
| Impact Rate | 3,600 IPM | 3,500 IPM | 3,550 IPM |
| Bare Weight | 2.6 lbs | 2.4 lbs | 2.5 lbs |
| Head Length | 5.0 in. | 4.8 in. | 5.0 in. |
| Bare Tool Price | $79.99 | $249 | $239 |
This is an eye-opening comparison. The specs show that Greenworks is not only 1/3 the price of Milwaukee and DeWalt, but it’s legitimately competitive in the compact class.
Greenworks Pro 3/8-Inch Impact Wrench Design Notes
Size and Weight
One of the biggest reasons to like the IW5370 is its smaller 3/8-inch format.
Compared with a mid-size or full-size high-torque impact wrench, the compact design makes more sense when you’re working in tighter spaces or dealing with smaller fasteners. You simply don’t want to carry around a large impact wrench when you don’t need that level of power.
The IW5370 weighs 2.6 pounds as a bare tool and 3.7 pounds with a 2.0Ah battery, making it incredibly well-balanced and easy to maneuver. That’s significantly lighter than all of the mid-torque impact wrenches we tested last year in our head-to-head roundup. Granted, this model is notably less powerful, so a lighter weight is reasonable, if not expected.
But even against other Pro brands, it’s in the ballpark. Milwaukee’s 2894 weighs 2.4 lbs, and DeWalt’s Atomic DCF923 weighs 2.5 lbs. Greenworks also matches DeWalt in head length, and is just 0.2 inches longer than Milwaukee.
The balance between size and output is really what makes this category useful. You get enough torque to handle jobs that would be tedious with hand tools, without moving all the way into the larger and heavier class of impact wrenches.
Controls
The control layout is straightforward. A single button on the foot of the tool lets you quickly cycle through the modes, while the trigger allows you to feather the speed to fit your needs.
I really like this approach. There’s no need for an overly complicated interface when the primary goal is to quickly select an output level and get to work.
Additional Features
- Tri-LED Worklight: Allows for greater visibility when driving fasteners
- Tether Ready: Lanyard loop at the base of the tool allows you to secure it while working at height
- Two-Position Belt Hook: Easily adjust the belt hook position to fit your preference
- 24V Compatibility: More than 200 tools, lawn care equipment, and lifestyle products work on the same 24V batteries
Greenworks Pro 3/8-Inch Impact Wrench Price
Price is where the IW5370 gets particularly interesting.
Greenworks currently lists the tool-only version at $79.99, but Walmart currently has it for a little less at $69.97. Greenworks also backs the tool with a 5-year limited warranty.
That’s an aggressively low price point for a brushless 3/8-inch impact wrench with a claimed 400 ft-lbs of breakaway torque, but we’re not upset about it!
The important thing is that Greenworks isn’t simply selling an inexpensive impact wrench with one maximum-power setting. The three power levels and Auto Mode give it a ton of versatility, making the tool more useful for everyday automotive and mechanical work.
Plus, if you’re already invested in Greenworks’ 24V battery platform, the value proposition gets even stronger.
Should You Buy It?
The Greenworks 24V PowerAll Pro IW5370 is a good example of why compact impact wrenches have become so useful. It doesn’t try to deliver the extreme torque of larger models, but it has enough power to get more done than you might expect. Plus, it does so in a smaller 3/8-inch package.
There are obvious limitations. If you’re regularly working on heavy equipment, large vehicles, or severely frozen fasteners, 400 ft-lbs of torque isn’t enough. In those situations, moving up to a larger 1/2-inch impact wrench makes a lot more sense.
Of course, that’s exactly why Greenworks has four Pro-focused impact wrenches in the line. With few exceptions, the IW5370 shouldn’t be your only impact wrench. Instead, it’s the most compact and pleasant to use until the application demands more power.
Fortunately, Greenworks low pricing means you can this and the mid-torque while still spending less money than you would on just one from other Pro brands. Sounds like a win-win to me.
Specs
- Model: Greenworks IW5370
- Power Source: Greenworks 24V battery
- Max No-Load Speed: 0-2,500 RPMs
- Impact Rate: 3,600 IPM
- Breakaway Torque: 400 ft-lbs
- Fastening Torque: 270 ft-lbs
- Anvil: 3/8 in. friction ring
- Weight: 2.6 lbs (bare tool), 3.7 lbs (with 2.0Ah battery)
- Head Length: 5 in.
