A perspective studio shot of the DEWALT 20V MAX ATOMIC 4-1/2 inch cordless angle grinder. The image showcases the compact brushless motor housing, the adjustable black safety guard, and the textured side handle designed for maximum stability during high-torque grinding applications.
A side profile of the DEWALT ATOMIC brushless angle grinder. The shot highlights the ergonomic paddle switch design for easy operation, the "Brushless" branding on the motor housing, and the slim body optimized for access into tight workspaces.
A top-down perspective view of the DEWALT DCG402B bare tool. The image focuses on the balanced design of the small angle grinder, emphasizing the Lanyard Ready attachment point at the base and the high-visibility yellow and black professional finish.
A marketing graphic displaying the complete contents of the DEWALT DCG402B bare tool kit. The image includes the 4-1/2 inch angle grinder, a Type B guard with a Type A clip-on guard, one Type 27 grinding wheel, a side handle, an inner/outer flange, and a wrench.
An annotated feature diagram of the DEWALT ATOMIC cordless angle grinder. Callouts highlight the Electronic Brake system, the Perform & Protect Anti-Rotation system, Tool Connect Chip Ready capability, a lock-off paddle switch, fast guard changes, and the spindle lock for easy wheel changes.
A comparison infographic showing the DEWALT ATOMIC grinder is 9 percent shorter in length compared to a leading pneumatic competitor. The graphic demonstrates the tool's ultra-compact size for increased productivity in confined jobsite environments.
A power performance chart illustrating that the DEWALT 20V MAX ATOMIC grinder provides up to 22 percent more power than a 0.5 HP rated pneumatic die grinder, highlighting its superior cordless brushless motor performance.
A safety infographic for the DEWALT Perform & Protect system. The graphic illustrates the Electronic Brake technology which stops the wheel in less than 1 second, and the Anti-Rotation system designed to prevent tool kickback during bind-up events.
A high-resolution studio shot of the DEWALT DCG402B angle grinder with the side handle installed. This bare tool view focuses on the industrial construction and the integrated lanyard loop for safety when working at heights.
An action lifestyle shot of a professional welder using the DEWALT ATOMIC 20V MAX cordless angle grinder to grind a large metal pipe. The image captures a shower of sparks, demonstrating the tool's 11,000 RPM power and the effective protection of the adjustable safety guard.
An action lifestyle shot of a professional tradesperson using the DEWALT 20V MAX ATOMIC cordless angle grinder to cut a thick metal pipe. The image shows the grinder in a horizontal position with sparks flying, highlighting the high-speed 11,000 RPM performance and the protective safety guard in use.
A wide action shot of a professional wearing a safety face shield and gloves while using the DEWALT ATOMIC 4-1/2 inch angle grinder on a long metal pipe in a fabrication shop. The image emphasizes the tool's portability and ease of use in industrial environments for precise metal cutting and grinding.
A close-up action shot of a professional fabricator wearing a leather apron and safety gear using the DEWALT DCG402B cordless grinder to finish a series of metal notches. The sparks illustrate the brushless motor power, while the compact ATOMIC series design is shown accessing tight areas on a large steel workpiece.
A high-contrast graphic of the ATOMIC COMPACT SERIES logo in white and yellow on a black and yellow background. This branding represents DEWALT's line of power tools designed to offer professional-grade power and performance in a more compact, maneuverable size.
A marketing graphic indicating the power requirements for this DEWALT 20V MAX bare tool. The image features a yellow "no" symbol over a battery and charger with bold text below stating BATTERY AND CHARGER SOLD SEPARATELY, clarifying that these accessories must be purchased individually.
DEWALT® Product Guides - Grinder Basics promotional how to video
A perspective studio shot of the DEWALT 20V MAX ATOMIC 4-1/2 inch cordless angle grinder. The image showcases the compact brushless motor housing, the adjustable black safety guard, and the textured side handle designed for maximum stability during high-torque grinding applications.
A side profile of the DEWALT ATOMIC brushless angle grinder. The shot highlights the ergonomic paddle switch design for easy operation, the "Brushless" branding on the motor housing, and the slim body optimized for access into tight workspaces.
A top-down perspective view of the DEWALT DCG402B bare tool. The image focuses on the balanced design of the small angle grinder, emphasizing the Lanyard Ready attachment point at the base and the high-visibility yellow and black professional finish.
A marketing graphic displaying the complete contents of the DEWALT DCG402B bare tool kit. The image includes the 4-1/2 inch angle grinder, a Type B guard with a Type A clip-on guard, one Type 27 grinding wheel, a side handle, an inner/outer flange, and a wrench.
An annotated feature diagram of the DEWALT ATOMIC cordless angle grinder. Callouts highlight the Electronic Brake system, the Perform & Protect Anti-Rotation system, Tool Connect Chip Ready capability, a lock-off paddle switch, fast guard changes, and the spindle lock for easy wheel changes.
A comparison infographic showing the DEWALT ATOMIC grinder is 9 percent shorter in length compared to a leading pneumatic competitor. The graphic demonstrates the tool's ultra-compact size for increased productivity in confined jobsite environments.
A power performance chart illustrating that the DEWALT 20V MAX ATOMIC grinder provides up to 22 percent more power than a 0.5 HP rated pneumatic die grinder, highlighting its superior cordless brushless motor performance.
A safety infographic for the DEWALT Perform & Protect system. The graphic illustrates the Electronic Brake technology which stops the wheel in less than 1 second, and the Anti-Rotation system designed to prevent tool kickback during bind-up events.
A high-resolution studio shot of the DEWALT DCG402B angle grinder with the side handle installed. This bare tool view focuses on the industrial construction and the integrated lanyard loop for safety when working at heights.
An action lifestyle shot of a professional welder using the DEWALT ATOMIC 20V MAX cordless angle grinder to grind a large metal pipe. The image captures a shower of sparks, demonstrating the tool's 11,000 RPM power and the effective protection of the adjustable safety guard.
An action lifestyle shot of a professional tradesperson using the DEWALT 20V MAX ATOMIC cordless angle grinder to cut a thick metal pipe. The image shows the grinder in a horizontal position with sparks flying, highlighting the high-speed 11,000 RPM performance and the protective safety guard in use.
A wide action shot of a professional wearing a safety face shield and gloves while using the DEWALT ATOMIC 4-1/2 inch angle grinder on a long metal pipe in a fabrication shop. The image emphasizes the tool's portability and ease of use in industrial environments for precise metal cutting and grinding.
A close-up action shot of a professional fabricator wearing a leather apron and safety gear using the DEWALT DCG402B cordless grinder to finish a series of metal notches. The sparks illustrate the brushless motor power, while the compact ATOMIC series design is shown accessing tight areas on a large steel workpiece.
A high-contrast graphic of the ATOMIC COMPACT SERIES logo in white and yellow on a black and yellow background. This branding represents DEWALT's line of power tools designed to offer professional-grade power and performance in a more compact, maneuverable size.
A marketing graphic indicating the power requirements for this DEWALT 20V MAX bare tool. The image features a yellow "no" symbol over a battery and charger with bold text below stating BATTERY AND CHARGER SOLD SEPARATELY, clarifying that these accessories must be purchased individually.
DEWALT® Product Guides - Grinder Basics promotional how to video
DEWALT

DEWALT DCG402B 20V MAX ATOMIC Brushless 4-1/2 Inch Cordless Angle Grinder (11000 RPM Anti-Rotation System Paddle Switch Metal Cutting Bare Tool)

In stock
SKU: DCG402B
$229.00 USD

Description

Authorized Dealer Badge DEWALT logout

The DEWALT DCG402B ATOMIC is a 20V MAX 4-1/2 inch brushless cordless angle grinder engineered to deliver 760 Max Watts Out (MWO) and a no-load speed of 11,000 RPM for high-efficiency metal cutting, rebar slicing, and weld grinding. This compact, bare tool profile incorporates an integrated electronic Anti-Rotation System that instantly halts motor operation upon detecting a wheel pinch or stall event. Outfitted with an automatic electronic brake designed to stop abrasive discs within 1.25 seconds, a safety lock-off paddle switch, and an adjustable guard configuration, this industrial-grade grinding tool resolves high-torque kickback risks and space limitations in narrow commercial jobsite environments. **Battery and charger sold separately.

Best Used For:

  • Confined Space Metalworking: Cutting rebar, grinding structural welds, and beveling steel plates in tight corners or restricted structural frameworks.
  • Overhead Fabrication Service: Prepping surfaces or dressing high iron beams safely where the slim profile and 4.78 lbs weight minimize worker strain.
  • Rapid Material Abatement: Slicing masonry, score-cutting concrete segments, and deburring cast metal pipe installations cleanly using Type 27 wheels.

Key Performance & Safety Features

  • Anti-Rotation System: Monitored internal sensor array cuts power immediately during wheel bind-ups to suppress high-torque twisting reactions.
  • Brushless Motor Technology: Maximizes runtime and tool life by generating up to 760 MWO without the frictional power losses of carbon brushes.
  • Rapid Electronic Brake: Drives wheel rotation to a complete standstill in an average of 1.25 seconds after paddle switch release for prompt safety.
  • Safety Paddle Switch: Built-in lock-off toggle lever ensures positive user engagement and stops accidental motorized activations inside tool boxes.
  • Tool Connect Chip Pathway: Prepared with internal tracking geometry to house asset-management transponders for simplified inventory tracking.

What's Included

  • (1) DCG402 ATOMIC™ 20V MAX* 4.5 in. Angle Grinder (Bare Tool)
  • (1) Type B Guard with Type A Clip-on Guard
  • (1) Type 27 Grinding Wheel
  • (1) Wrench
  • (1) Side Handle

Technical Specifications

Key Value
Manufacturer DEWALT
Model Number DCG402B
Voltage 20V MAX*
Motor Type Brushless
No-Load Speed 11,000 RPM
Max Watts Out (MWO) 760 MWO
Wheel Diameter 4-1/2 Inches
Switch Type Paddle Switch (No Lock-On)
Brake Time Approx. 1.25 Seconds
Tool Weight (Bare) 4.78 lbs
Assembled Length 11.89 Inches

Pro-Tip: When introducing a new Type 27 grinding disc, execute a quick 30-second no-load spin down test away from personnel; this verifies true disc alignment and ensures the safety hub interface functions flawlessly prior to applying deep abrasive forces.