DEWALT 20V MAX Brushless 4.5-inch Cordless Angle Grinder DCG408B Bare Tool — Paddle-Switch, Anti-Rotation

The DEWALT 20V MAX Brushless 4.5" paddle-switch angle grinder (DCG408B) is a cordless, high-speed grinder built for demanding jobsite cutting and grinding when paired with a 20V MAX battery.

This compact, brushless grinder is engineered to keep speed under load, handle 4"–5" wheels, and protect internal components with debris-mitigating mesh screens. It ships as a bare tool only (battery and charger sold separately) and balances power, safety features, and portability for metalworkers, fabricators, and general contractors who need a dependable cordless grinder.

How does the DCG408B maintain performance during heavy grinding?

The brushless motor delivers consistent torque and up to 9,000 RPM (no load), which helps preserve cutting and grinding speed under load. Built-in overload protection reduces stress on the motor while electronic controls help sustain output across demanding tasks.

• Brushless motor rated up to 850 MWO for efficient power delivery
• Maintains constant speed under load for cleaner cuts and smoother grinding
• Overload protection helps prevent motor damage during extended use

What safety and protection features are included for jobsite use?

This grinder includes several safety-driven systems designed to reduce the risk of accidents and component failure. ANTI-ROTATION features like a Kickback Brake and E-Clutch help control the tool if binding occurs, while mesh screens help keep debris out of internal parts.

• Kickback Brake and E-Clutch for anti-rotation protection
• Type A and Type B guards included to fit different wheel types and meet compliance
• Debris mesh screens to reduce internal wear and extend tool life

How suitable is this grinder for portability and long shifts?

The DCG408B is engineered to be lightweight and ergonomic to reduce operator fatigue during extended use. At 3.55 lbs (bare tool), it’s easier to maneuver in tight spaces and overhead applications, while run-time estimates help you plan battery swaps on the job.

• Lightweight 3.55 lb bare tool reduces operator fatigue
• Paddle-switch design for quick start/stop control and intuitive operation
• Estimated run time: up to 56 cuts of 1/2" rebar on a charged battery (actual run time varies by battery)

Which wheel sizes and accessories can I use with this grinder?

The DCG408B accepts common angle-grinder wheels between 4" and 5", giving you flexibility for cutting, grinding, and finishing tasks. It ships with both Type A and Type B guards so you can adapt the tool to different wheel profiles and job requirements.

• Compatible with 4"–5" wheels for cutting and grinding versatility
• Includes Type A and Type B guards for multiple wheel configurations
• Accessory compatibility with standard DEWALT angle-grinder attachments

Who is this for? The DEWALT DCG408B is intended for tradespeople and serious DIYers who need a cordless grinder that balances power, safety, and portability. It fits crews that already use DEWALT 20V MAX batteries and want a compact brushless grinder for metal fabrication, rebar cutting, masonry tuckpointing with appropriate discs, and general jobsite grinding. Because the tool is sold as a bare unit, it’s ideal for users who already own DEWALT batteries or who prefer to choose battery capacity to match their workflow.