DeWalt DCG408B (20V MAX Brushless Cordless 4-1/2 in. Paddle-Switch Grinder, Tool Only)

By DeWalt · Angle Grinders · Power Tools

  • 20 V MAX brushless
  • Wheel 4-1/2 in (4-5 in acceptance)
  • Up to 9,000 RPM no load, 850 MWO
  • Up to 56 cuts of 1/2 in rebar (DCB205 battery)
  • Weight 3.55 lb bare

Lowest price seen
~$199.99 (approx.)
from $199.99 at Amazon

Prices are snapshots. Check the current price with the store.

Summary

DeWalt’s current 20V MAX paddle-switch brushless angle grinder, sold as a bare tool for shops already on DeWalt 20V batteries. Check the evidence before you buy: no independent instrumented test and no exact-model owner history exist, so every number here is a manufacturer rating.

Strengths

  • The brushless motor holds constant speed under load and never needs brush changes.
  • The paddle switch cuts power the instant you let go; there is no lock-on to forget.
  • Kickback brake and E-CLUTCH shut the tool down on high-load events to reduce reaction torque.
  • Tool-free guard change and a clip-on cutting guard cover grinding and cutting with one tool.
  • Mesh screens keep debris out of the internals.
  • The 3-year limited warranty with 1 year free service is standard DeWalt coverage.

Weaknesses

  • No independent instrumented test of this exact model exists; 850 MWO and 9,000 RPM are manufacturer ratings, not measurements.
  • No exact-model owner discussion could be located, so real-world reliability is unknown.
  • Battery, charger and wheels are sold separately; the bare price is not the real cost.
  • Paddle switch only: no lock-on and no variable speed — that is the DCG410VSB’s job.
  • Not Tool Connect chip-ready, unlike the DCG410VSB.
  • DeWalt’s imagery claims 8% lighter than the DCG412, but nobody has measured it.

Verified specifications

Motorbrushless, rated up to 850 MWO (max watts out).
No-load speedup to 9,000 RPM.
Wheel sizeaccepts 4–5 in. wheels; marketed as a 4-1/2 in. grinder.
Switchpaddle switch with no lock-on; quick shutoff.
SafetyPERFORM & PROTECT anti-rotation system with kickback brake and E-CLUTCH, plus E-Switch Protection no-volt release.
Guardtool-free guard change; clip-on guard converts the grinding guard for cutting.
Debris managementmesh screens block debris from internal components.
Runtime claimup to 56 cuts of 1/2 in. rebar per charge with a DCB205 battery and DW8062 cutting wheel (both sold separately).
Battery and chargernot included; bare tool only.
Includesgrinder, side handle, clip-on guard, inner and outer flange, hex wrench.
Weightnot published on DeWalt’s product page; a 3.55 lb bare figure circulates in retailer briefs but could not be confirmed from the manufacturer page or manual.
Dimensionsnot published for the bare tool; the Home Depot listing shows carton dimensions of 4.9 × 6.3 × 13.2 in, which are packaging, not tool.
Warranty3-year limited warranty, 1 year free service, 90-day satisfaction guarantee.
Full research notes and sources

Safety and control

The paddle switch is the point of this model: press to run, release to stop, with no lock-on to leave spinning. Under the PERFORM & PROTECT label, DeWalt combines a kickback brake and E-CLUTCH, an electronic clutch that shuts the unit off on high-load events to reduce reaction torque. E-Switch Protection adds no-volt release: after an unexpected shutdown or a battery swap, the switch must be released and re-actuated before the tool runs again. Mesh screens over the vents are intended to keep debris away from internal components.

Runtime and the 56-cut claim

DeWalt claims up to 56 cuts of 1/2 in. rebar per charge, but the number is conditional: it assumes a DCB205 battery and a DW8062 cutting wheel, both sold separately. Real runtime varies with material and technique, and no independent test has measured cut rate, RPM under load or brake response. Treat 56 as a best-case marketing figure, not a shift quota.

Maintenance, parts and warranty

The manual’s maintenance list is short: blow dirt and dust out of the air vents with clean, dry air at least once a week, never use solvents or harsh chemicals on non-metallic parts, and use only DeWalt-recommended accessories. DeWalt publishes an exploded parts diagram for the DCG408 (NA542902), so service documentation exists, though actual parts availability through DeWalt service was not verified. Warranty coverage is 3 years limited with 1 year free service and a 90-day satisfaction guarantee.

Is it worth it?

At $120 or less this is an easy add for a shop already on DeWalt 20V MAX batteries. From $121 to $160 it is fair, and you should weigh it against the XR DCG410B and DCG410VSB or the DCG412B, which may offer more features at similar street pricing. Above $160 the case weakens: with no independent test and no owner history, the premium is hard to justify. Acme Tools had the bare tool on sale at $179.00 in October 2026, marked down from $199.00.

Which model this is

This page covers the DeWalt DCG408B, the paddle-switch 4-1/2 in. brushless grinder in DeWalt’s current 20V MAX line, sold as ASIN B0DQYLSHKF. It is the paddle-switch sibling of the slide-switch DCG407B; both share instruction manual NA532201. Do not confuse it with the larger DCG412B, the XR DCG410B, the FLEXVOLT ADVANTAGE DCG416B, the Atomic DCG402 or the corded DWE402W.

Sources

Manufacturer:

Independent reviews:

Owner reports:

  • No exact-model owner threads could be located.

Parts and stores:

Related products