The DEWALT DCG407B angle grinder is a cordless 4-1/2 inch grinder built for grinding and cutting on the jobsite without dragging a cord around. This is an angle grinder designed for metal grinding, cutting, and general fabrication work. Model Number: DCG407B. If you want a battery-powered grinder that stays compact, runs a slide switch for longer passes, and still brings real jobsite output, this is the one DEWALT aimed at day-to-day pro use.

What matters here is how the tool behaves under pressure. DEWALT built this model around a brushless motor that maintains constant speed under load, with up to 9,000 RPM at no load and up to 850 max watts out. In plain terms, that means more consistent wheel speed when you are cleaning welds, trimming pipe, knocking down rust, or making repeated cutoff passes. DEWALT also rates it for up to 56 cuts in 1/2 inch rebar per charge when used with a DCB205 battery and a DW8062 cutting wheel, which gives you a practical reference for real work instead of just a lab number.

This grinder is set up for common wheel sizes, accepting 4 inch to 5 inch wheels, with a 4.5 inch wheel diameter called out for the tool. That makes it a versatile fit for the kind of accessories most users already stock. The slide switch matters too. On a grinder, switch style is not a small detail. A slide switch is the better choice if you spend time on longer grinding passes because you are not squeezing a paddle the whole time. For repetitive deburring, edge cleanup, and surface prep, that makes the tool less tiring to run.

DEWALT also put real effort into keeping this grinder alive on dirty jobsites. Mesh screens help block debris from getting into the internal components, which is worth paying attention to if you work around grinding dust, scale, or metal fines. The tool also includes overload protection plus PERFORM & PROTECT anti-rotation features such as Kickback Brake and E-CLUTCH. Those features are there for the moments when a wheel binds or the tool gets twisted unexpectedly. They do not replace good technique, but they absolutely make a difference when conditions get ugly.

From a setup standpoint, the DCG407B keeps things straightforward. It includes a Type B guard for grinding plus a clip-on guard that converts the setup for cutting operations, and DEWALT added quick-change, tool-free guard removal so you are not wasting time hunting for a wrench every time the task changes. The side handle gives you the second point of contact you want for better control, and the spindle lock helps with wheel swaps. At about 4.87 lbs bare, it stays manageable for overhead or awkward-angle work without feeling like a toy.

This is a tool-only grinder, so batteries and charger are sold separately. It runs on the DEWALT 20V MAX battery platform, which is a big deal if you are already in that system and want to add a grinder without buying into another battery line. It is a strong fit for metalworking, mechanical trades, steel stud work, electrical crews doing strut and threaded rod cleanup, and contractors who need a grab-and-go cordless grinder for punch-list and service work. If your work is mostly light to medium grinding and cutting and you want cordless convenience with pro-grade features, this model makes a lot of sense.

DEWALT DCG407B angle grinder hits the sweet spot for everyday cordless grinding

This is the kind of cordless grinder that earns its keep because it gives you the safety features, wheel flexibility, and runtime you want without getting oversized or fussy.

• Who it's for: Pros and serious DIY users who already run DEWALT 20V MAX batteries and need a dependable grinder for metal cutting, grinding, rust cleanup, and punch-list work.
• Why it stands out: Brushless motor, 9,000 RPM output, kickback control features, debris-blocking mesh screens, and tool-free guard changes make it more than just a basic bare-tool grinder.
• Worth knowing: It is sold as a tool only, and no wheel is included, so plan on adding the right battery and accessories for your work right away.

• Is this a corded or cordless grinder? It is a cordless angle grinder powered by the DEWALT 20V MAX battery platform.
• What wheel size does it use? The tool is built around a 4.5 in wheel size and accepts common 4 in to 5 in wheels.
• Does it have a variable speed dial? No. The published specs list a maximum no-load speed of 9,000 RPM and do not indicate variable speed.
• Does it include safety and overload features? Yes. DEWALT lists overload protection along with Kickback Brake and E-CLUTCH anti-rotation features.