By Pro Tool Reviews
Published: September 2026
Main Facts
When tackling automotive, mechanical, or general maintenance work, the heavy artillery of a high-torque, industrial impact wrench is often overkill. Lugging a clunky, high-output tool into cramped engine bays or beneath a chassis can quickly turn a simple repair into an ergonomic nightmare. Recognizing this gap between traditional hand tools and oversized powerhouses, Greenworks has expanded its 24V platform with a precision-focused, compact solution: the Greenworks Pro 3/8-Inch Impact Wrench (IW5370).
Designed for professionals and serious DIYers alike, the IW5370 pairs a lightweight, highly maneuverable form factor with advanced brushless motor technology and smart operating modes. Delivering up to 2,500 RPM, 3,600 IPM, 400 ft-lbs of breakaway torque, and 270 ft-lbs of fastening torque, this compact tool sits squarely in the sweet spot for everyday automotive and mechanical applications.
What makes this release particularly disruptive, however, is the price tag. Coming in at a bare-tool retail price of $79.99 (and spotted at select retailers for even less), the IW5370 challenges legacy professional tool brands by offering high-tier performance specs at roughly a third of the cost. Combined with a 5-year limited warranty, the Greenworks IW5370 is reshaping expectations of what budget-friendly cordless power tools can achieve.
Chronology and Hands-On Development
The evolution of the Greenworks 24V Pro impact wrench lineup has been rapid and strategic. Over recent cycles, the manufacturer has systematically built out a multi-tiered ecosystem designed to handle everything from light-duty assembly to heavy industrial teardowns.
- The Foundation: Greenworks initially established its footprint with lightweight 24V tools aimed at residential lawn care and basic garage tasks. However, the company’s pivot toward Pro-grade construction saw the introduction of heavier impact wrenches, such as the mid-torque 1/2-inch IW5550 (560 ft-lbs breakaway torque) and heavier siblings like the IW5800 (750 ft-lbs) and IW51500 (1,430 ft-lbs).
- The Gap in the Market: While these larger tools handled stubborn truck lug nuts and heavy machinery with ease, field testers and automotive technicians repeatedly noted the lack of a nimble, highly controlled 3/8-inch platform that could fit into tight clearances without fatiguing the wrist.
- The Hands-On Reveal: Upon getting hands-on time with the IW5370 in late 2026, reviewers discovered that Greenworks’ design philosophy centered heavily on refined control. Rather than simply scaling down a larger motor, engineers integrated a specialized brushless power plant paired with tripartite LED work lights, triple-speed regulation, and a dedicated Auto Mode to prevent fastener run-off.
- Market Entry: The tool officially entered the marketplace to broad industry attention, serving as the new baseline compact offering for the Greenworks 24V Pro battery platform.
Supporting Data and Technical Specifications
To understand how the Greenworks IW5370 performs in the real world, it helps to examine the raw engineering metrics, compare it against its stablemates within the Greenworks ecosystem, and measure it up against legacy Pro competitors like Milwaukee and DeWalt.
Technical Specifications Matrix
| Feature | Greenworks 24V Pro IW5370 | Greenworks 24V Pro IW5550 | Milwaukee M18 Fuel 2854 | DeWalt Atomic 20V Max DCF923 |
|---|---|---|---|---|
| Drive Size | 3/8-inch | 1/2-inch | 3/8-inch | 3/8-inch |
| Max No-Load Speed | 2,500 RPM | 2,400 RPM | 2,400 RPM | 2,500 RPM |
| Fastening Torque | 270 ft-lbs | Not listed | Not listed | 300 ft-lbs |
| Breakaway Torque | 400 ft-lbs | 560 ft-lbs | 250 ft-lbs | 450 ft-lbs |
| Impact Rate (IPM) | 3,600 IPM | 3,400 IPM | 3,500 IPM | 3,550 IPM |
| Bare Weight | 2.6 lbs | 3.2 lbs (est.) | 2.4 lbs | 2.5 lbs |
| Working Weight (w/ Battery) | 3.7 lbs (2.0Ah) | 3.9 lbs (2.0Ah) | N/A | N/A |
| Head Length | 5.0 in. | 5.75 in. | 4.8 in. | 5.0 in. |
| Bare Tool Price | $79.99 | $89.99 | $249.00 | $239.00 |
Analyzing the Performance Metrics
When reviewing the spec sheets, the efficiency of the Greenworks IW5370 becomes immediately apparent. Weighing in at just 2.6 pounds bare (and 3.7 pounds paired with a 2.0Ah 24V battery), it offers a remarkably balanced profile in the hand. Its compact 5-0-inch head length matches DeWalt’s Atomic series toe-to-toe and sits just fractions of an inch behind Milwaukee’s ultra-compact M18 Fuel architecture.
Furthermore, the IW5370’s 400 ft-lbs of breakaway torque punches well above its weight class. Compared directly to Milwaukee’s M18 Fuel 2854 (which registers at 250 ft-lbs of breakaway torque), the Greenworks model extracts superior raw extraction force while drastically undercutting the price point.
Design Notes, Features, and Ergonomics
Size, Weight, and Balance
The primary justification for choosing a 3/8-inch impact wrench over a mid-torque or high-torque alternative is maneuverability. Working beneath a vehicle dashboard, inside an engine compartment, or around complex suspension components requires a tool that minimizes wrist fatigue.
The IW5370 achieves this through a carefully distributed center of gravity. Even when loaded with a compact 24V battery, the tool does not feel nose-heavy. Technicians can comfortably hold and operate the wrench for extended periods without experiencing the cramping associated with heavy-duty tools.
Speed Settings and Power Regulation
Not every fastener requires maximum torque. Overdriving smaller bolts can strip threads, shear heads, or damage delicate housings. To combat this, Greenworks equipped the IW5370 with three distinct speed and power modes on its digital interface:
- Mode 1: 150 ft-lbs
- Mode 2: 300 ft-lbs
- Mode 3: 400 ft-lbs
These settings allow users to dial in the exact output needed for specific tasks, keeping the tool entirely under control whether they are running down small bolts or backing out stubborn, rusted hardware.
Intelligent Auto Mode
Beyond the standard speed profiles, the IW5370 features a dedicated Auto Mode. When activated, this smart feature addresses one of the most frustrating aspects of using impact wrenches: fastener run-off.
When removing a bolt under significant load, standard impact wrenches often continue spinning at high velocity the moment the fastener breaks free, frequently causing the nut to fly off into dark engine bays or strip threads upon exit. Auto Mode detects when the fastener has broken loose and intelligently regulates the run-off speed, granting the user supreme control during extraction.
Tri-LED Work Light Mode
Illumination in dark workspace environments is a perennial challenge. Greenworks addressed this by integrating a bright tri-LED array encircling the tool’s anvil.
Beyond the standard trigger-activated behavior (which keeps the lights on for ten seconds after releasing the switch), the IW5370 features a dedicated Work Light Mode. By pressing a designated button, users can force the LEDs to remain illuminated continuously for up to ten minutes, effectively transforming the impact wrench into a functional handheld flashlight. This thoughtful inclusion eliminates the need to hold a separate inspection light or awkwardly balance a flashlight while working in tight, unlit spaces.
Official Responses and Industry Reception
Reactions from professional trade reviewers and the broader tool community have highlighted the disruptive nature of the Greenworks Pro 24V ecosystem.
Industry analysts noted that while legacy brands like Milwaukee, DeWalt, and Makita have long dominated the professional automotive space, their pricing structures often place high-end brushless tools out of reach for budget-conscious apprentices, mobile mechanics, and home garage enthusiasts. By delivering a tool that matches—and in some metrics exceeds—the performance of premium compact impact wrenches at roughly 33% of the cost, Greenworks is forcing a conversation about value versus brand-name markup.
Representatives for Greenworks emphasize that the 24V Pro platform was engineered from the ground up to bridge the performance gap between consumer-grade equipment and heavy commercial tools, without sacrificing user accessibility or backing down on reliability. The inclusion of a 5-year limited warranty further signals the manufacturer’s confidence in the durability of its brushless motor technology and electronic control systems.
Implications for Professionals and Consumers
The introduction of the Greenworks Pro IW5370 carries several noteworthy implications for the cordless power tool market:
- Democratization of Pro-Grade Features: Advanced features like multi-stage power modes, automated run-off controls, and sustained LED work-light modes were once exclusive to top-tier, highly expensive tool platforms. The IW5370 proves these technologies can be profitably manufactured and sold at sub-$80 price points.
- Platform Diversification: For consumers already invested in the Greenworks 24V battery ecosystem—whether through outdoor power equipment or previous garage tools—the IW5370 represents a frictionless, highly cost-effective addition to their kit.
- Strategic Tool Selection: The tool reinforces the modern consensus that no single impact wrench can do everything. Rather than relying on a heavy, cumbersome 1/2-inch wrench for every task, mechanics can now pair the ultra-lightweight IW5370 for 90% of standard fastening and teardown work, reserving heavy high-torque tools exclusively for severe, frozen industrial applications.
- Competitive Pressure: As brands like Greenworks continue to close the performance gap while maintaining aggressive pricing, legacy tool manufacturers will face increasing pressure to re-evaluate their pricing models and feature sets in the compact tool category.
Verdict: Should You Buy It?
The Greenworks Pro 24V IW5370 3/8-Inch Impact Wrench is a textbook example of modern engineering efficiency. It does not attempt to brute-force heavy equipment maintenance with unrealistic torque claims; instead, it provides clean, controlled, highly portable power tailored specifically for the fasteners you encounter most frequently.
Of course, limitations exist. If your daily routine involves tearing down rusted commercial semi-truck suspensions or heavy agricultural machinery, 400 ft-lbs of breakaway torque will not be enough. In those extreme scenarios, stepping up to a mid-torque or high-torque 1/2-inch wrench remains essential.
However, for the vast majority of automotive repairs, machinery maintenance, and garage projects, the Greenworks IW5370 hits an extraordinary sweet spot. Given its featherlight 2.6-pound body, smart operating modes, brilliant LED lighting, and an aggressively low $79.99 bare-tool price point, it stands as one of the best overall value propositions in the cordless power tool market today.
