A perspective studio shot of the DEWALT DCG408B 20V MAX brushless 4-1/2-inch angle grinder showing its bright yellow composite body, textured black rubber handle grip, silver cast metal gear housing, and a black auxiliary side handle against a clean white background.
A direct side profile studio view of the cordless paddle-switch angle grinder with a black type B grinding guard attached, highlighting the low-profile gear case design and the safety paddle actuator running along the bottom handle frame.
A top-down studio view of the DEWALT brushless angle grinder, demonstrating the symmetrical slim body ergonomics and the placement of the non-locking paddle switch assembly beneath the motor casing.
A rear three-quarter studio perspective of the angle grinder bare tool, showing the open 20V battery dock terminal base and the integrated tool-free guard adjustment clamp.
A bottom view of the cordless angle grinder highlighting the specifications data plate label, the ergonomic safety paddle lever, and the clean lines of the composite yellow shell.
An infographic diagram breaking down key performance parameters of the 20V max brushless grinder, with clean callout text lines highlighting the brushless motor, perform and protect systems, dust-filtering mesh screens, paddle switch operation, 4.5-inch wheel size capacity, and quick-change tool-free guard removal.
An action photo of a metal fabricator wearing high-grip work gloves using the cordless angle grinder to trim an outdoor steel fence post. A lower banner notes that the tool body is engineered 8% lighter than the previous DCG412 model for improved overhead handling.
An infographic overlay diagram highlighting a compact frame silhouette change. A solid yellow product rendering is shown against a dark grey ghosted background shape of a traditional tool casing, calling out a body profile that is 29% smaller based on volume comparisons.
A macro detailed rendering focusing on the cast metal gear case and spindle assembly of the DEWALT power tool. A bold yellow graphic banner across the bottom calls attention to the integrated electronic overload protection system designed to prevent tool failure under heavy pressure.
An action image of a concrete contractor using a cutting wheel on the 20V brushless grinder to shear vertical steel reinforcing rods on an excavation site. The lower text block emphasizes industrial runtime efficiency, tracking up to 56 cuts of 1/2-inch rebar per single battery charge cycle.
A side profile studio view of the DEWALT DCG408B cordless paddle-switch angle grinder presented on a white background underneath a prominent black marketing banner showcasing the official 20V MAX Brushless system logo.
How To Use The ATOMIC™ 20V MAX* 4-1/2 in promotional video
A perspective studio shot of the DEWALT DCG408B 20V MAX brushless 4-1/2-inch angle grinder showing its bright yellow composite body, textured black rubber handle grip, silver cast metal gear housing, and a black auxiliary side handle against a clean white background.
A direct side profile studio view of the cordless paddle-switch angle grinder with a black type B grinding guard attached, highlighting the low-profile gear case design and the safety paddle actuator running along the bottom handle frame.
A top-down studio view of the DEWALT brushless angle grinder, demonstrating the symmetrical slim body ergonomics and the placement of the non-locking paddle switch assembly beneath the motor casing.
A rear three-quarter studio perspective of the angle grinder bare tool, showing the open 20V battery dock terminal base and the integrated tool-free guard adjustment clamp.
A bottom view of the cordless angle grinder highlighting the specifications data plate label, the ergonomic safety paddle lever, and the clean lines of the composite yellow shell.
An infographic diagram breaking down key performance parameters of the 20V max brushless grinder, with clean callout text lines highlighting the brushless motor, perform and protect systems, dust-filtering mesh screens, paddle switch operation, 4.5-inch wheel size capacity, and quick-change tool-free guard removal.
An action photo of a metal fabricator wearing high-grip work gloves using the cordless angle grinder to trim an outdoor steel fence post. A lower banner notes that the tool body is engineered 8% lighter than the previous DCG412 model for improved overhead handling.
An infographic overlay diagram highlighting a compact frame silhouette change. A solid yellow product rendering is shown against a dark grey ghosted background shape of a traditional tool casing, calling out a body profile that is 29% smaller based on volume comparisons.
A macro detailed rendering focusing on the cast metal gear case and spindle assembly of the DEWALT power tool. A bold yellow graphic banner across the bottom calls attention to the integrated electronic overload protection system designed to prevent tool failure under heavy pressure.
An action image of a concrete contractor using a cutting wheel on the 20V brushless grinder to shear vertical steel reinforcing rods on an excavation site. The lower text block emphasizes industrial runtime efficiency, tracking up to 56 cuts of 1/2-inch rebar per single battery charge cycle.
A side profile studio view of the DEWALT DCG408B cordless paddle-switch angle grinder presented on a white background underneath a prominent black marketing banner showcasing the official 20V MAX Brushless system logo.
How To Use The ATOMIC™ 20V MAX* 4-1/2 in promotional video
DEWALT

DEWALT DCG408B 4 1/2 Inch Paddle Switch Angle Grinder (20V MAX Brushless Motor 9000 RPM Cordless Heavy Metal Cutting Grinding Bare Tool)

In stock
SKU: DCG408B
$179.00 USD

Description

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Maintain Constant Speed Under Load with Advanced High-Performance Cordless Grinding

The DEWALT DCG408B 20V MAX Brushless Cordless 4-1/2-Inch Paddle-Switch Angle Grinder delivers up to 850 Max Watts Out (MWO) and a fixed 9,000 no-load RPM for intensive structural metal processing. Operating on an efficient brushless motor platform, this tool automatically maintains constant velocity under heavy loads and accommodates regional wheel disc capacities from 4.0 inches to 5.0 inches. It serves as an authoritative solution for slicing rebar, preparing thick weld seams, and surfacing carbon steel without the hazard of cord restrictions or the downtime of brush changes.

Best Used For:

  • Metal Reinforcement Cutting: Rapidly slicing through structural 1/2-inch steel rebar, threaded rods, and angle iron on site.
  • Industrial Fabrication Grinding: Smoothing out heavy weldments, beveling pipe profiles, and deburring rough metal edges.
  • Surface Refinishing Prep: Stripping deep mill scale, rust build-up, and localized slag from steel plates or cast iron structures.

Key Performance & Safety Features

  • Perform & Protect Safety Controls: Integrated anti-rotation electronic clutch (E-CLUTCH) and kickback brake systems disengage the motor immediately if a wheel pinch or bind occurs.
  • Heavy-Duty Brushless Performance: Industrial brushless motor increases tool efficiency, eliminates carbon brush maintenance, and maintains constant cutting speed under maximum mechanical load.
  • Intuitive Paddle-Switch Operation: Non-locking paddle switch provides quick power shut-off when released, significantly lowering the risk of accidental job-site start-ups.
  • Tool-Free Guard Removal: Quick-change guard release system permits step-less adjustments and rapid wheel guard configuration without necessitating hand tools.
  • Durable Mesh Intakes: Replaceable integrated metal mesh screens filter airborne concrete dust and steel debris out of the internal motor housing to prolong electronic component life.

What's Included

  • (1) DCG408B 20V MAX Brushless 4-1/2 In. Paddle-Switch Angle Grinder (Bare Tool)
  • (1) 4-1/2 Inch Type B Grinding Safety Guard
  • (1) Clip-On Convertible Cutting Guard Guard Shield
  • (1) Two-Position Side Auxiliary Auxiliary Handle
  • (1) Flange Wrench

Technical Specifications

Technical Parameter Structured Data Value
Brand Manufacturer DEWALT
Model Identification Number DCG408B
System Voltage 20V MAX
Power Source Architecture Cordless Battery Pack
Motor Power Configuration Brushless
Maximum Tool Speed 9,000 RPM
Switch Interface Type Paddle Switch
Wheel Acceptance Capacity 4-1/2 in (Compatible Range 4 in to 5 in)
Variable Speed Regulator No (Fixed Optimized Torque)
Bare Tool Assembled Weight 4.83 lbs
Assembled Tool Length 13.0 in
Assembled Tool Width 6.75 in
Assembled Tool Height 5.1 in
Universal Product Barcode (UPC) 885911954136

**Battery and charger sold separately.


Pro-Tip: To extend the runtime of your 20V brushless motor when slicing thick rebar or sheet metal, avoid using excessive side-loading pressure. Let the 9,000 RPM blade velocity path its own cut seamlessly. Forcing a 4-1/2-inch abrasive wheel into structural iron binds the matrix, which causes the internal e-clutch electronic protection to activate and draws unnecessary amperage from your battery pack.