DeWalt DCG422 vs Milwaukee 3485: A Practical Die Grinder Comparison

Introduction

Cordless die grinders have become essential tools for metalwork, automotive repair, and fabrication. The recent release of the DeWalt DCG422, the company’s first right angle die grinder, has put Milwaukee directly in its sights. DeWalt claims this new model is 53% more powerful than the Milwaukee 3485, a bold statement that deserves scrutiny.

This comparison puts both tools through practical testing alongside several budget-friendly alternatives. The goal is to determine whether the numbers on paper translate to real-world performance, and whether the premium price tags are justified.

The Contenders

The DeWalt DCG422 is a true right angle die grinder with a compact head design. It runs on the 20V platform and accepts slide-on batteries. The Milwaukee 3485 is technically an inline die grinder with a handle extending from the end, direct-driven to reduce vibration and complexity.

Both tools offer four power modes and locking collets with push-button locks. The DeWalt includes a ring light that produces substantial illumination around the work area. The Milwaukee, meanwhile, has been a staple in the M12 lineup and benefits from years of refinement.

The price difference is notable: the Milwaukee 3485 sells for $229, while the DeWalt DCG422 comes in at $249. Both sit at the top of the cordless die grinder market, so buyers should expect premium performance.

Evaluation Criteria

To fairly assess these tools, several factors matter beyond raw power. Speed under load, peak power output, sustained power, and ergonomics all influence how useful a die grinder is in daily work. Battery compatibility and overall size also play a role, especially for users who need to fit the tool into tight spaces.

Practical tasks, such as removing paint and mill scale from steel, reveal how each tool handles real-world conditions. A tool that measures well on a dyno but cuts out under normal use may not be the better choice.

DeWalt DCG422: The New Challenger

The DeWalt DCG422 is noticeably smaller in person than its pictures suggest. Its head measures 3 inches (76.7 mm) compared to the Milwaukee’s 4.3 inches (110 mm), making it easier to fit into confined areas. The head width is also slimmer at 1.7 inches versus 2.1 inches on the Milwaukee.

This compact head design is a genuine advantage for users who work around obstacles. The tool is taller overall due to the 20V battery mounted at the base, but the weight distribution places the bulk near your hand rather than at the business end.

On the dyno, the DeWalt delivers more than 20,000 RPM at free speed. Under load, it maintains about 18,500 RPM, similar to the Milwaukee. Peak power reaches 330 watts before the tool cuts out, and with a 3.5 amp hour power stack battery, it sustains around 320 watts.

However, the DeWalt has a sensitive protection system. It cuts out if the RPM dips below approximately 15,000, even for a split second. This can be frustrating during practical tasks where you apply varying pressure. The tool often stops more frequently than users might hope, making quick jobs take longer than expected.

Milwaukee 3485: The Established Option

The Milwaukee 3485 has been on the market for years and benefits from continuous refinement. Its inline design with a handle sticking off the end is direct-driven, which reduces vibration and eliminates the bevel gear assembly found in true right angle grinders.

This Gen 2 model is much more forgiving than earlier versions. It allows users to load the tool up and down without triggering protection cutouts. Under load, it makes similar RPM to the DeWalt but can be dragged down to 10,000 or 11,000 RPM before giving up. This makes it feel more robust during practical use, even if its peak power is lower.

The Milwaukee’s peak output measures around 320 watts, slightly below the DeWalt’s 330 watts. Its sustained power is also lower, but the tool’s willingness to keep running under heavy load makes it feel more capable in real-world scenarios. When handing both tools to users, most come away with the impression that the Milwaukee is the more powerful option, despite the DeWalt’s higher dyno numbers.

The M12 platform limits battery choices compared to DeWalt’s 20V system, but the compact 12V form factor keeps the tool lighter and easier to maneuver.

Budget Alternatives: Hercules, Hyper Tough, and John’s Well

For buyers who do not need flagship performance, several budget cordless die grinders offer decent value. The Hercules and Hyper Tough models are both 12V right angle die grinders, which are often more useful for vehicle work. They demand more power due to the attachments used, but their straight die grinder counterparts typically use smaller diameter attachments that bog down less.

The John’s Well kit takes a different approach. For $99, it includes a combo straight die grinder and cordless ratchet all-in-one, plus a bit driver and two 2.5 amp hour batteries. That works out to roughly $48 per tool when paired together. The kit ships with a 6 mm collet instead of a 1/4 inch one, which makes fitting attachments more fiddly.

On the dyno, the John’s Well kit does not reach its stated 18,000 RPM even at free speed. Under load, it bogs down to about 10,800 RPM, below the Hercules and Hyper Tough. Its peak power is around 150 watts, and sustained output settles at about 120 watts. As a ratchet, it produces 23 ft-lb of torque and finished a test in 301 seconds, slower than the Hyper Tough’s 279 seconds.

Despite these modest numbers, the John’s Well concept is appealing. The idea of repurposing a high-speed brushless motor for multiple tool types could save money if executed with more power and a larger battery option. The Hercules and Hyper Tough models offer more conventional performance at similar price points.

The Robi Wildcard

The Robi die grinder has been available for years and remains a strong contender. It runs on an 18/20V platform and, with a slim 4 amp hour battery, achieves 20,900 RPM under load and a full 390 watts peak power. That beats both the DeWalt and Milwaukee in raw output.

The Robi is also significantly cheaper, often selling for around $100, which is roughly two and a half times less than the DeWalt. Its pistol shape feels natural to grip, even if the overall form is chunky. For users who prioritize power per dollar, the Robi is difficult to beat.

Overall Buying Advice

Choosing between these die grinders depends on your priorities. The DeWalt DCG422 offers the most compact head for tight spaces and higher peak power than the Milwaukee. Its 20V platform provides more battery options, including power stack packs. However, its sensitive protection system can be annoying during practical use, and it does not deliver the 53% power advantage DeWalt advertises.

The Milwaukee 3485 is more forgiving under load and feels more powerful in hand, even if its dyno numbers are lower. Its 12V form factor keeps it light and maneuverable, and years of refinement have made it a reliable choice.

For budget-conscious buyers, the Robi offers the best power-to-price ratio. The Hercules and Hyper Tough models provide decent performance at modest prices, while the John’s Well kit is an interesting concept that needs a more powerful motor and larger battery to reach its potential.

Conclusion

The DeWalt DCG422 is a capable tool with a clever head design and genuine power on tap. Its protection system, however, undermines the experience during real-world tasks. The Milwaukee 3485 remains a solid, forgiving option that many users will find more pleasant to use.

The Robi continues to impress as a value pick, proving that premium prices do not always guarantee premium performance. Ultimately, the best choice depends on whether you prioritize compact head size, forgiving behavior, or raw power per dollar.