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DCG402B

ATOMIC™ 20V MAX* 4.5 In. Angle Grinder (Tool Only)

A close-up view of a DEWALT cordless angle grinder with a black and yellow handle, shown without a grinding disc attached.

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Product details

Complete high-powered applications in tight spaces with the ATOMIC™ 20V MAX* 4.5 in. Angle grinder (battery and charger sold separately) that delivers optimized maneuverability and up to 760 MWO. This unit is equipped with the DEWALT® perform and protect 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 this tool to access ultra tight spaces, while the clip-on guard can quickly convert a type b guard into a type a guard.

  • Help Maximize Control - Equipped with the DEWALT® perform and protect 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 1.25 seconds* after the ON/OFF trigger is released.
  • Ergonomic Design - Complete applications with a slim, ergonomic design that has a smaller gripping diameter†† for access into ultra tight spaces.
  • Fast Guard Changes - Quickly convert your standard type b guard into a type a guard with a clip on guard.
  • Easy Wheel Changes - Change wheels quickly with the spindle lock, removing the need for multiple wrenches.
  • Brushless Motor Performance - Take on demanding applications with up to 760 MWO and 11,000 RPM (no-load).
  • Paddle Switch - Designed with lock off paddle and no-lock on feature.
  • Forward Exhaust System - Direct air away from the user with an exhaust system that helps prevent overheating from the motor.
  • Tool Connect Chip Ready - Pair the Tool Connect Chip (sold separately) and DEWALT® Tool Connect app‡ for data on jobsite asset management and tool location.
  • Where Size Meets Power - ATOMIC™ power tools are part of the expanding DEWALT® 20V MAX* system, offering size without compromise.

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

  • (1) DCG402 ATOMIC™ 20V MAX* 4 .5 in. Angle Grinder
  • (1) Type B Guard with Type A Clip-on Guard
  • (1) Type 27 Grinding Wheel
  • (1) Wrench
  • (1) Side Handle

  • 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 .045 T1 (DW8062) wheel (sold separately).

* ††Tool only based on volume vs. DCG408B Angle Grinder.

* ‡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
NA701145_DCG402_T1_20250728.svg
SVG
Exploded Diagram, Type 1
NA701145_DCG402_T1_20260302.299944.svg
SVG

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ATOMIC™

WHERE SIZE MEETS POWER™

Discover compact tools engineered for maximum performance. DEWALT® ATOMIC™ tools deliver the strength you demand without the bulk.

A DEWALT cordless angle grinder is placed on a metal workbench in a workshop. A person wearing dark clothing and gloves is holding a metal pipe, with various metal parts and tools visible on the table.
A worker using a DEWALT angle grinder to cut a metal pipe, producing sparks in an industrial workshop setting.
A person wearing a face shield, gloves, and a brown apron is using a DEWALT angle grinder to work on a metal piece, generating sparks. Another DEWALT tool is resting on the table nearby. The scene takes place in an industrial workshop.

Ergonomic design

Up to 29% smaller†† for access into ultra tight spaces.

A person wearing a face shield, gloves, and a brown apron is using a DEWALT angle grinder to work on a metal piece, generating sparks. Another DEWALT tool is resting on the table nearby. The scene takes place in an industrial workshop.
A person wearing protective gloves and clothing is using a DEWALT cordless angle grinder to cut through a metal pipe, creating sparks in a workshop setting.

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.

Yellow graphic states battery and charger not included with product.

Bare tool notice

This item does not include a battery or charger. Compatible batteries and accessories can be found within the ATOMIC™ 20V MAX* system.

Yellow graphic states battery and charger not included with product.
A wide assortment of DEWALT branded power tools and accessories, including drills, saws, grinders, and batteries, arranged in front of a partially constructed wall.

ATOMIC™

Designed to be compact and powerful for a wide range of applications, our ATOMIC™ 20V MAX* tools are WHERE SIZE MEETS POWER™.