DEWALT DCG400S2 20V MAX ATOMIC compact cordless angle grinder kit contents displayed over a clean white layout background including a yellow and black fabric storage contractor bag, an 8 Amp fast battery charger base, a standalone 3.5 Ah XR POWERSTACK lithium-ion battery block, and the bare angle grinder power tool housing assembly
Elevated three-quarter studio profile view of the DEWALT compact cordless angle grinder showcasing its textured rubberized handle grip, underslung paddle switch mechanism, adjustable protective steel safety wheel guard, and attached yellow 3.5 Ah battery pack module
Product feature overview infographic diagram pointing out the key engineering performance parameters of the DEWALT ATOMIC compact series grinder outlining its integrated 1.15-second electronic brake mechanism, anti-rotation safety system, tool connect chip-ready slot, paddle switch layout, quick-change spindle lock, and tool-free fast guard clip modules
DEWALT DCG400S2 cordless angle grinder kit accessory breakdown diagram displaying separate compartments detailing the DCG400B atomic bare tool housing body, two DCBP320 3.5 Ah batteries, a DCB118 dual-voltage 8 Amp fast battery charger dock, a fabric storage bag, and specialized abrasive cutting wheels, flanges, and guard modules
Direct horizontal left side profile studio view of the DEWALT compact cordless angle grinder detailing the slender yellow motor chassis casing, central branding prints, lower paddle trigger linkage path, and rear-mounted lithium-ion cell slot configuration over a solid white backdrop
Low-angle three-quarter rear perspective studio view of the DEWALT compact brushless angle grinder showcasing the heavy-duty gear case housing guard ring layout and textured black battery pack assembly seated at the tail base of the tool handle frame
Oblique right side horizontal profile studio view of the DEWALT cordless compact angle grinder highlighting the technical warning label specifications screen, lower battery latch point, and clear brushless motor branding labels on the back side of the chassis case
Direct right side horizontal horizontal view of the DEWALT compact cordless angle grinder displaying the technical instruction text panel on the yellow motor shell frame, the black paddle switch lock-off catch tab, and the side air intake vent windows
Close-up jobsite action photograph of a trade professional wearing protective leather work gloves holding a DEWALT angle grinder to smooth a metal edge with a lower graphic text banner indicating its electronic brake stops the wheel within 1.15 seconds after trigger release
Action image of a fabricator using a DEWALT ATOMIC series cordless grinder to cut down a heavy carbon steel angle iron beam on a workshop floor with a prominent lower callout banner stating help maximize control equipped with the DEWALT anti-rotation system
Product capability infographic featuring a close-up action view of a worker using the DEWALT 20V MAX ATOMIC compact grinder in a narrow space with sparks flying, with a lower text block stating 13% lighter than competitive pneumatic angle grinder in use
Automotive mechanic wearing safety glasses and a face shield holding the DEWALT DCG400S2 compact cordless angle grinder near a vehicle exhaust system pipe inside a repair garage workshop
Industrial manufacturing fabricator wearing a protective face shield and safety gloves operating the DEWALT ATOMIC 20V compact cordless grinder at a steel work table inside a large metal fabrication plant
Close-up action view of a structural metalworker wearing thick leather safety gloves using the DEWALT 4 inch cordless angle grinder to prepare and grind a curved steel pipe elbow piece
Metal fabricator using the DEWALT compact cordless grinder to cut through a structural steel box channel tube clamped to a metal workbench while throwing bright orange friction sparks
DEWALT ATOMIC 20V MAX compact cordless angle grinder resting horizontally on a metal workshop fabrication bench next to a black welding helmet hood and a heavy duty steel C-clamp tool
DEWALT® 20V MAX* ATOMIC COMPACT SERIES™: WHERE SIZE MEETS POWER™ promotional video
DEWALT DCG400S2 20V MAX ATOMIC compact cordless angle grinder kit contents displayed over a clean white layout background including a yellow and black fabric storage contractor bag, an 8 Amp fast battery charger base, a standalone 3.5 Ah XR POWERSTACK lithium-ion battery block, and the bare angle grinder power tool housing assembly
Elevated three-quarter studio profile view of the DEWALT compact cordless angle grinder showcasing its textured rubberized handle grip, underslung paddle switch mechanism, adjustable protective steel safety wheel guard, and attached yellow 3.5 Ah battery pack module
Product feature overview infographic diagram pointing out the key engineering performance parameters of the DEWALT ATOMIC compact series grinder outlining its integrated 1.15-second electronic brake mechanism, anti-rotation safety system, tool connect chip-ready slot, paddle switch layout, quick-change spindle lock, and tool-free fast guard clip modules
DEWALT DCG400S2 cordless angle grinder kit accessory breakdown diagram displaying separate compartments detailing the DCG400B atomic bare tool housing body, two DCBP320 3.5 Ah batteries, a DCB118 dual-voltage 8 Amp fast battery charger dock, a fabric storage bag, and specialized abrasive cutting wheels, flanges, and guard modules
Direct horizontal left side profile studio view of the DEWALT compact cordless angle grinder detailing the slender yellow motor chassis casing, central branding prints, lower paddle trigger linkage path, and rear-mounted lithium-ion cell slot configuration over a solid white backdrop
Low-angle three-quarter rear perspective studio view of the DEWALT compact brushless angle grinder showcasing the heavy-duty gear case housing guard ring layout and textured black battery pack assembly seated at the tail base of the tool handle frame
Oblique right side horizontal profile studio view of the DEWALT cordless compact angle grinder highlighting the technical warning label specifications screen, lower battery latch point, and clear brushless motor branding labels on the back side of the chassis case
Direct right side horizontal horizontal view of the DEWALT compact cordless angle grinder displaying the technical instruction text panel on the yellow motor shell frame, the black paddle switch lock-off catch tab, and the side air intake vent windows
Close-up jobsite action photograph of a trade professional wearing protective leather work gloves holding a DEWALT angle grinder to smooth a metal edge with a lower graphic text banner indicating its electronic brake stops the wheel within 1.15 seconds after trigger release
Action image of a fabricator using a DEWALT ATOMIC series cordless grinder to cut down a heavy carbon steel angle iron beam on a workshop floor with a prominent lower callout banner stating help maximize control equipped with the DEWALT anti-rotation system
Product capability infographic featuring a close-up action view of a worker using the DEWALT 20V MAX ATOMIC compact grinder in a narrow space with sparks flying, with a lower text block stating 13% lighter than competitive pneumatic angle grinder in use
Automotive mechanic wearing safety glasses and a face shield holding the DEWALT DCG400S2 compact cordless angle grinder near a vehicle exhaust system pipe inside a repair garage workshop
Industrial manufacturing fabricator wearing a protective face shield and safety gloves operating the DEWALT ATOMIC 20V compact cordless grinder at a steel work table inside a large metal fabrication plant
Close-up action view of a structural metalworker wearing thick leather safety gloves using the DEWALT 4 inch cordless angle grinder to prepare and grind a curved steel pipe elbow piece
Metal fabricator using the DEWALT compact cordless grinder to cut through a structural steel box channel tube clamped to a metal workbench while throwing bright orange friction sparks
DEWALT ATOMIC 20V MAX compact cordless angle grinder resting horizontally on a metal workshop fabrication bench next to a black welding helmet hood and a heavy duty steel C-clamp tool
DEWALT® 20V MAX* ATOMIC COMPACT SERIES™: WHERE SIZE MEETS POWER™ promotional video
DEWALT

DEWALT Cordless Angle Grinder DCG400S2 4 Inch Compact Power Tool Kit (20V MAX ATOMIC Brushless 755 MWO Motor E-Clutch Narrow Space Metal Cutting)

In stock
SKU: DCG400S2
$599.00 USD

Description

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Compact Brushless Handheld Surface Conditioning and Safety Anti Rotation Controls

The DEWALT DCG400S2 ATOMIC™ 20V MAX* 4-Inch Cordless Angle Grinder Kit is an ultra-compact electric power tool engineered to execute high-powered fabrication, weld scaling, and tight-clearance material removal. Driven by an advanced brushless motor delivering up to 755 Max Watts Out (MWO) and a 12500 RPM no-load velocity, this machine replicates the raw force profile of 0.7 HP rated pneumatic grinders without restrictive air lines. Jobsite safety is prioritized by an integrated anti-rotation system that arrests spindle rotation in less than a tenth of a second during sudden wheel pinches or stalls to isolate operators from severe reactionary torque. This versatile battery-powered assembly incorporates an electronic brake that stops attached media within 1.15 seconds of trigger release, making it ideal for restricted workspace steel conduit slicing and pipe dressing.

Best Used For:

  • Restricted Clearance Grinding: Polishing interior weld seams, deburring framework joints, and leveling structural steel brackets in tight corners.
  • Precision Conduit Slicing: Sectioning thin-wall electrical metallic tubing, structural iron pipe tracks, and metallic strut channels.
  • Field Slag Conditioning: Cleaning oxidation scales, coarse slag, rust formations, and commercial coatings from raw metal surfaces.

Key Performance & Safety Features

  • 755 MWO Brushless Core: Compact motor design yields up to 44% more power density than standard 0.7 HP pneumatic industrial alternatives.
  • Anti-Rotation System Clutch: Monitors aggressive tool twisting and cuts motor current to safely absorb torque spikes during material binding events.
  • 1.15 Second Electronic Brake: Rapid deceleration circuitry quickly halts abrasive wheel rotation immediately upon releasing the lock-off paddle trigger.
  • Convertible Guard System: Utilizes a specialized tool-free clip-on guard module to convert a standard Type B open shield into a fully enclosed Type A safety configuration.
  • Spindle Lock Flange: Enables fast single-wrench abrasive disc changes to eliminate the need for cumbersome multi-wrench tool arrays.
  • Forward Direction Exhaust: Structural housing vents force thermal exhaust air away from the user face to prevent internal motor overheating.

What's Included

  • (1) DCG400 ATOMIC™ 20V MAX* 4-Inch Brushless Angle Grinder
  • (2) DCBP320 20V MAX* XR® 3.5Ah POWERSTACK Batteries
  • (1) DCB118 Fan-Cooled Battery Fast Charger
  • (1) Type B Guard with Type A Clip-on Guard Module
  • (1) 1/16-Inch Type 1 Cutting Wheel
  • (1) 1/8-Inch Type 1 Grinding Wheel
  • (1) 3/8-Inch and 5/8-Inch Outer Flanges Set
  • (1) Reversible Inner Flange
  • (1) Spindle Wrench
  • (1) Heavy-Duty Contractor Kit Bag

Technical Specifications

Product Type Small Angle Grinder
Voltage 20V MAX
Power Source Battery (Cordless)
Motor Type Brushless
Maximum Speed 12500 RPM (No Load)
Maximum Power Output 755 MWO (0.7 HP Equivalent)
Wheel Diameter Compatibility 4 in
Outer Flange Hub Thread Options 3/8 in and 5/8 in
Switch Interface Type Paddle Switch (Lock-Off, No Lock-On)
Total Battery Count 2
Battery Technology XR POWERSTACK Lithium-Ion (3.5 Ah)
Charger Base Included Yes
Overload Protection Yes
Total Kit Piece Count 10
Assembled Kit Weight 9.2 lbs
Assembled Unit Dimensions 13.9 x 10.2 x 5.98 in

Pro-Tip: Because this compact grinder features an automatic forward directional exhaust matrix, hold the rear handle with a firm parallel stance. This maintains proper ambient motor intake ventilation paths when diving deep into narrow structural steel stud channels or tightly clustered pipe networks.