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 20V MAX ATOMIC 4-1/2 Inch Cordless Angle Grinder DCG402B Brushless 11000 RPM Anti-Rotation System Electronic Brake Paddle Switch Bare Tool

In stock
SKU: DCG402B
$229.00 USD

Description

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Where Size Meets Power: DEWALT ATOMIC 20V MAX* 4-1/2 Inch Brushless Cordless Angle Grinder

Tackle demanding metalworking and masonry tasks in the most restricted spaces with the DEWALT DCG402B ATOMIC™ 20V MAX* 4-1/2 Inch Angle Grinder. Engineered for professionals who require a high-performance tool without the bulk, this compact grinder delivers an impressive 760 MWO and 11,000 RPM (no-load speed) via its high-efficiency brushless motor. Its slim, ergonomic profile and reduced gripping diameter allow for superior maneuverability and access to ultra-tight corners that traditional grinders simply cannot reach. Whether you are cutting rebar, grinding welds, or prepping surfaces at height, this tool provides the untethered productivity of the 20V MAX* system with the rugged power of a corded unit.

Safety and control are prioritized through DEWALT's advanced ANTI-ROTATION System. This innovative feature monitors wheel movement and instantly shuts down the motor if a pinch, stall, or bind-up is detected, significantly reducing reactionary torque and protecting the user. Additionally, the integrated electronic brake is designed to stop the wheel in approximately 1.25 seconds after the trigger is released, ensuring a safer workspace. With Lanyard Ready™ attachment points for safety at height and a spindle lock for rapid, wrench-free wheel changes, the DCG402B is the ultimate jobsite companion for efficiency and operator protection. **Battery and charger sold separately.

Key Features

  • DEWALT ANTI-ROTATION System: Rapidly stops the wheel during pinch or bind-up events to maximize user control.
  • High-Efficiency Brushless Motor: Delivers up to 760 MWO and 11,000 RPM for professional-grade cutting and grinding.
  • Slim Ergonomic Design: Compact body with a smaller gripping diameter allows for easier access to ultra-tight workspaces.
  • Electronic Brake: Stops the wheel in an average of 1.25 seconds after the trigger is released for enhanced safety.
  • Quick Guard Conversions: Easily switch between Type B and Type A guards with the included clip-on guard.
  • Spindle Lock: Enables fast, easy wheel changes, reducing downtime and the need for multiple specialized wrenches.
  • TOOL CONNECT™ Chip Ready: Compatible with TOOL CONNECT™ chips (sold separately) for smart jobsite asset management.
  • Paddle Switch Design: Features a lock-off paddle for safety while preventing accidental tool activation.

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

Specifications

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
UPC / Barcode 885911969932

Pro-Tip: To maximize the efficiency of your ATOMIC grinder, always ensure you are using the correct guard for the task—use the Type A clip-on for cutting and the Type B for grinding. This ensures optimal debris deflection and protects the brushless motor from unnecessary dust intake, significantly extending the tool's lifespan.