DeWalt’s ATOMIC 20V MAX lineup just grew into die grinder territory, and the timing is good — pneumatic die grinders have been the default for metalworkers and fabricators for decades, but cordless alternatives have never quite closed the power gap. The new DCG420 (inline) and DCG422 (right-angle) are DeWalt’s attempt to change that math.
Two Tools, Two Use Cases
The DCG420B is a standard inline die grinder — the tool you reach for when grinding welds, deburring, or working in straight-line applications where you need the bit or burr in front of you. The DCG422B is a right-angle design, built for tight spaces where an inline tool won’t reach: inside engine bays, pipe joints, or anywhere you’re working off to the side.
Both run on the ATOMIC 20V MAX platform — DeWalt’s compact-focused line designed for maneuverability over raw power — with brushless motors that push into territory previously reserved for air tools.
Key Specs
DCG420B (Inline Die Grinder):
- Up to 19% more power vs. 0.5 HP rated pneumatic die grinders
- Up to 2x more power vs. Milwaukee M12 die grinder (2486-20)
- 45% smaller by volume than Milwaukee M18 die grinder
- 1/4″ collet
- Brushless motor, glass-filled nylon housing (solvent resistant)
DCG422B (Right Angle Die Grinder):
- 24,500 RPM no-load speed
- Up to 22% more power vs. 0.5 HP rated pneumatic die grinders
- Spindle lock for quick wheel changes
- Paddle switch, forward exhaust system, onboard LED
- Brushless motor, glass-filled nylon housing
Why Cordless Die Grinders Matter Now
Die grinders are one of the last holdouts in the air-tool world. They run at high RPM under load, demand sustained power, and punish batteries that can’t maintain voltage. Most cordless attempts before this have been underwhelming — lower RPM, voltage sag mid-use, or simply too heavy to be practical.
The ATOMIC platform’s brushless motor design (see brushed vs. brushless motors explained) keeps heat and power loss lower, which helps maintain performance longer. The 45% size reduction over the M18 die grinder is also worth noting — die grinders go into small spaces, and size matters.
Specs can be deceiving with grinders. For the full breakdown on what those power numbers actually mean in practice, check Power Tool Specs Decoded.
Availability and Platform Fit
Both tools run on any ATOMIC, XR, or 20V MAX battery — the same batteries powering most of DeWalt’s cordless lineup. The DCG420 has been available since fall 2025; the DCG422 right-angle model started shipping February 2026. Pricing wasn’t publicly announced at launch, but the ATOMIC line typically lands at competitive price points compared to XR tools.
If you’re already in the DeWalt ecosystem or building out a fabrication toolkit, these are worth a look. Not sure if DeWalt is the right platform for your use case? See our Best Pro Combo Kits 2026 guide for a cross-brand comparison of what each ecosystem offers.
Sources: ToolGuyd, Stanley Black & Decker Newsroom
