Angle Grinders: Cutting, Grinding, and Finishing Metal
Few tools are as versatile — or as dangerous if misused — as an angle grinder. From cutting rebar to grinding welds smooth, polishing stainless, and removing rust, an angle grinder is essential for any metalworking, fabrication, or demo application. DeWALT and Milwaukee have each built strong contenders in the cordless 4.5/5-inch class.
DeWALT DCG418B FLEXVOLT Grinder
The DCG418B on 60V FLEXVOLT is one of the most powerful cordless angle grinders on the market. It spins at 9,000 RPM with electronic braking, kickback detection, and an overload indicator that warns before the tool shuts down under stress. The FLEXVOLT platform delivers corded-equivalent performance — 1-pound-per-minute metal removal rates that match many corded competitors. The no-tool guard adjustment and tool-free wheel changes are genuine time savers on busy sites.
Milwaukee M18 FUEL 2780-20
Milwaukee’s M18 FUEL grinder spins at 10,000 RPM on an 18V platform — higher RPM than the FLEXVOLT despite lower voltage, thanks to its highly efficient POWERSTATE motor. It features ANTI-KICKBACK reaction control and automatic restart protection. Its paddle switch (on the 2781 model) is preferred by fabricators for safe one-handed control during cuts. At 4.5 lbs with a 5Ah battery, it’s well-balanced for extended sessions.
Guard and Safety Features
Both grinders meet ANSI/ISO safety standards for disc guarding. DeWALT’s kickback detection stops the disc within 60ms of a bind event — faster than any human reaction. Milwaukee’s ANTI-KICKBACK system engages similarly quickly. Both systems represent a major safety advance over conventional corded grinders, which offer no electronic protection.
Disc Compatibility and Versatility
Both accept standard 4.5-inch and 5-inch discs with 5/8-inch-11 arbor — you can use grinding wheels, cutting discs, wire cups, flap discs, and surface conditioning discs from any manufacturer. Diablo and Weiler are consistently among the best performing accessories for both tools.
The Verdict
For maximum power and heavy material removal: DeWALT DCG418B FLEXVOLT. For all-day grinding balance and higher RPM for cutting: Milwaukee M18 FUEL 2780-20. Shop both at Pro Tools Hub.
