Angled profile view of the DEWALT DCG400B ATOMIC 20V MAX brushless cordless 4-inch angle grinder highlighting the slim ergonomic body, electronic brake system, and protective wheel guard.
Side profile of the DEWALT ATOMIC 20V MAX cordless angle grinder showcasing the safety paddle switch and the durable yellow and black housing designed for tight spaces.
A front-angled view of the DEWALT 4-inch brushless angle grinder displaying the adjustable Type B protective guard and the high-performance motor branding.
Top-down view of the DEWALT ATOMIC 20V MAX 4-inch angle grinder detailing the industrial labeling and the compact profile engineered to be 13 percent lighter than pneumatic grinders.
Rear angled view of the DEWALT 20V MAX brushless angle grinder showcasing the battery port and integrated debris filters to protect the motor during heavy-duty metalworking.
Annotated diagram of the DEWALT DCG400B angle grinder pointing out key performance features including the electronic brake, anti-rotation system, paddle switch, and tool connect chip ready port.
Kit overview for the DEWALT DCG400B bare tool, listing the angle grinder, wrench, Type B guard with Type A clip-on, two Type 1 wheels, and various mounting flanges.
Action shot of the DEWALT ATOMIC 20V MAX angle grinder cutting through a structural steel beam with sparks, demonstrating its lightweight and powerful cordless efficiency.
A professional fabricator using the DEWALT 20V MAX 4-inch cordless angle grinder to grind a steel component, highlighting its design which is 29 percent smaller than standard DEWALT grinders.
Promotional image for the DEWALT DCG400B angle grinder resting on a metal surface, emphasizing the anti-rotation system designed to maximize operator control during binds or stalls.
Close-up action shot of the DEWALT brushless angle grinder in use with a gloved hand, emphasizing the electronic brake designed to stop the wheel in 1.15 seconds for enhanced job site safety.
A professional tradesperson using the DEWALT DCG400B cordless angle grinder to cut a large metal pipe, highlighting that the tool delivers 44 percent more power than 0.7 HP pneumatic grinders.
DEWALT® Product Guides - Grinder Basics promotional how to video
Angled profile view of the DEWALT DCG400B ATOMIC 20V MAX brushless cordless 4-inch angle grinder highlighting the slim ergonomic body, electronic brake system, and protective wheel guard.
Side profile of the DEWALT ATOMIC 20V MAX cordless angle grinder showcasing the safety paddle switch and the durable yellow and black housing designed for tight spaces.
A front-angled view of the DEWALT 4-inch brushless angle grinder displaying the adjustable Type B protective guard and the high-performance motor branding.
Top-down view of the DEWALT ATOMIC 20V MAX 4-inch angle grinder detailing the industrial labeling and the compact profile engineered to be 13 percent lighter than pneumatic grinders.
Rear angled view of the DEWALT 20V MAX brushless angle grinder showcasing the battery port and integrated debris filters to protect the motor during heavy-duty metalworking.
Annotated diagram of the DEWALT DCG400B angle grinder pointing out key performance features including the electronic brake, anti-rotation system, paddle switch, and tool connect chip ready port.
Kit overview for the DEWALT DCG400B bare tool, listing the angle grinder, wrench, Type B guard with Type A clip-on, two Type 1 wheels, and various mounting flanges.
Action shot of the DEWALT ATOMIC 20V MAX angle grinder cutting through a structural steel beam with sparks, demonstrating its lightweight and powerful cordless efficiency.
A professional fabricator using the DEWALT 20V MAX 4-inch cordless angle grinder to grind a steel component, highlighting its design which is 29 percent smaller than standard DEWALT grinders.
Promotional image for the DEWALT DCG400B angle grinder resting on a metal surface, emphasizing the anti-rotation system designed to maximize operator control during binds or stalls.
Close-up action shot of the DEWALT brushless angle grinder in use with a gloved hand, emphasizing the electronic brake designed to stop the wheel in 1.15 seconds for enhanced job site safety.
A professional tradesperson using the DEWALT DCG400B cordless angle grinder to cut a large metal pipe, highlighting that the tool delivers 44 percent more power than 0.7 HP pneumatic grinders.
DEWALT® Product Guides - Grinder Basics promotional how to video
DEWALT

DEWALT DCG400B ATOMIC 20V MAX 4 Inch Brushless Cordless Angle Grinder with Anti Rotation System Electronic Brake and Paddle Switch Bare Tool

In stock
SKU: DCG400B
$299.00

Description

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Maximize Your Precision in Tight Spaces with the DEWALT ATOMIC 20V MAX 4-Inch Angle Grinder

The DEWALT DCG400B ATOMIC™ 20V MAX* 4-Inch Angle Grinder is a high-performance cordless solution specifically engineered to deliver industrial power in a compact, ultra-maneuverable frame. Replicating the performance of a 0.7 HP rated pneumatic grinder, this brushless motor tool provides a massive 755 MWO and a rapid no-load speed of 12,500 RPM. Designed for professional fabricators and contractors, its slim and ergonomic profile is 13% lighter than leading pneumatic alternatives, allowing you to access confined areas where traditional grinders simply cannot reach. Whether you are cutting steel, grinding welds, or prepping surfaces, the DCG400B offers the untethered productivity you need to dominate the job site.

Safety and control are prioritized through DEWALT's innovative ANTI-ROTATION System, which detects pinches or stalls and instantly stops the wheel to reduce reactionary torque. This 4-inch grinder also features an advanced electronic brake that brings the wheel to a complete halt in under 1.15 seconds after the paddle switch is released. With a versatile clip-on guard system that quickly converts from Type B to Type A, a spindle lock for fast wheel changes, and a forward exhaust system to direct debris away from the user, this ATOMIC™ series grinder is built to handle demanding metalworking applications with unmatched precision. **Battery and charger sold separately.

Key Features

  • Powerful brushless motor delivers 755 MWO and 12,500 RPM for high-demand grinding and cutting
  • ANTI-ROTATION System instantly stops the wheel when a pinch or stall is detected to maximize operator control
  • Electronic Brake stops the grinding wheel within 1.15 seconds after trigger release for enhanced safety
  • Slim and lightweight ergonomic design is 13% lighter than competitive pneumatic grinders for easy overhead use
  • Versatile Type B guard with a Type A clip-on guard allows for fast conversions without additional tools
  • Pneumatic-like performance offers 44% more power than standard 0.7 HP air-powered grinders
  • Convenient spindle lock allows for rapid, one-wrench wheel changes to minimize downtime
  • Safety paddle switch features a lock-off mechanism and no-lock-on function for improved user protection
  • Forward exhaust system directs airflow away from the user and prevents motor overheating
  • Compatible with standard 4-inch accessories with 3/8-inch and 5/8-inch arbors

What's Included

**Battery and charger sold separately.

  • (1) DCG400 ATOMIC™ 20V MAX* 4-in. Angle Grinder
  • (1) Wrench
  • (1) Type B Guard
  • (1) Type A Clip-on Guard
  • (1) 1/16 in. Type 1 Wheel
  • (1) 1/8 in. Type 1 Wheel

Specifications

Tool Power Type Cordless / Battery Powered
Voltage 20V MAX*
Motor Type Brushless
Wheel Diameter 4 Inches
Max Speed (No Load) 12,500 RPM
Max Power Output 755 MWO
Switch Type Paddle Switch with Lock-Off
Assembled Weight 4.34 lbs.
Assembled Length 11.8 Inches
Brake Time < 1.15 Seconds
Guard Type Type A (Cut) & Type B (Grind)

Pro-Tip

Pro-Tip: To maximize the efficiency of the DCG400B's brushless motor, always ensure you are using the correct guard for the task—use the clip-on Type A guard for all cutting applications and the Type B for grinding. This ensures proper debris redirection and optimal cooling airflow. Additionally, when using the 4-inch wheel, avoid applying excessive downward force; let the high 12,500 RPM speed of the tool do the work to prevent the ANTI-ROTATION system from triggering prematurely during deep cuts.