Skip to main content
Accessibility StatementRead more
DEWALT logo with yellow text on a black background.
DCG400B

20V MAX** ATOMIC™ 4" angle grinder (TOOL ONLY)

A DEWALT 20V brushless cordless grinder tool, shown in black and yellow colors, featuring a wheel guard and ergonomic handle.

Reviews

Product details

Complete high-powered applications in tight spaces with the ATOMIC™ 20V MAX** 4 in. Angle grinder (battery and charger sold separately) that delivers optimized maneuverability and 755 MWO. This tool is equipped with the DEWALT® anti-rotation system to help maximize control. This feature quickly stops the wheel when a pinch, stall, or bind-up event is sensed, reducing reactionary torque. An ergonomic design allows access to ultra tight spaces, while the clip-on guard can quickly convert a type b guard into a type a guard. Replace pneumatic angle grinders with this cordless solution that delivers untethered performance, productivity, and pneumatic-like power† .

  • DEWALT®'s First Cordless 4 In. Angle Grinder - Get cordless convenience and unprecedented performance from our first cordless 4 in. Angle grinder compatible with standard 4 in. X 3/8 in. And 4 in. X 5/8 in. Accessories (sold separately).
  • Help Maximize Control - Equipped with the DEWALT® anti-rotation system. This feature quickly stops the wheel when a pinch, stall, or bind-up event is sensed, reducing reactionary torque. The switch needs to be cycled (turned on and off) to restart the tool.
  • Electronic Brake - Help maintain control with the electronic brake designed to stop the wheel within 1.15 seconds after the ON/OFF trigger is released.
  • Ergonomic Design - Complete applications with a slim, ergonomic design that's 13% lighter than a competitive pneumatic angle grinder in use† †  for access into ultra tight spaces without sacrificing power.
  • Fast Guard Changes - Quickly convert your standard type b guard into a type a guard with a clip on guard.
  • Up to 44% More Power Than 0.7 HP Rated Pneumatic Angle Grinders† - Work fast and help optimize productivity.
  • Easy Wheel Changes - Change wheels quickly with the spindle lock that removes the need for multiple wrenches.
  • Brushless Motor Performance - Take on demanding applications with 755 MWO and 12,500 (no load) RPM.
  • Paddle Switch - Replicate the power performance of 0.7 HP rated pneumatic angle grinders with this 4 in. Angle grinder that has a lock off paddle and no-lock on features.
  • Forward Exhaust System - Direct air away from the user with an exhaust system that helps prevent overheating from the motor.

Product Type
Angle Grinder
Voltage
20V
Cordless or Corded
Cordless
Power Source
Battery
Tool Only
Yes

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

  • 3 Year Limited Warranty, 1 Year Free Service, 90 Days Satisfaction Guaranteed

* *Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18.

* **On average using 1/16" T1 DW8716 wheel.

* †Based on MWO using DCBP320 battery (sold separately)

* ††Measured with DCBP320 battery (sold separately) vs. PATCO GAL-1340-1 with 4" of connected 1/2" diameter hose and equal accessories. PATCO™ is a trademark of Patco Air Tools, Inc., which has not endorsed, approved, or sponsored this comparison.

* ‡Additional subscription charge and third-party data charges may apply.

Downloads and manuals

Instruction Manual, Type 1
NA556885_DCG400_DCG402_T1__NA.pdf
PDF
Exploded Diagram, Type 1
NA701144_DCG400_T1.svg
SVG
Exploded Diagram, Type 1
NA701144_DCG400_T1_20250302.299942.svg
SVG