DeWalt DCG407B (20V MAX Brushless Cordless 4-1/2 in. Slide-Switch Grinder, Tool Only)

By DeWalt · Angle Grinders · Power Tools

  • Wheel 4-1/2 in
  • 20 V MAX, brushless
  • Up to 9,000 RPM no load, 850 MWO
  • Up to 56 cuts of 1/2 in rebar (with DCB205 battery)
  • Warranty 3 years limited

Lowest price seen
$179.00
from $179.00 at The Power Tool Store · Checked Oct 10, 2026

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

Summary

A bare-tool brushless angle grinder for DeWalt’s 20V MAX battery platform, spinning at up to 9,000 RPM with a slide switch, Kickback Brake and E-Clutch. Check your battery shelf before you buy: the tool ships without a battery or charger, and a buyer new to the platform faces a total cost approaching $300.

Strengths

  • At 3.55 lb bare, it stays light through overhead work and long sessions.
  • The brushless motor holds speed under load and never needs brush changes.
  • The slide switch with lock-on suits anyone tired of holding a trigger down.
  • Kickback Brake and E-Clutch cut the motor in under 0.1 s when a wheel binds.
  • Tool-free guard change and mesh debris screens are practical job-site features.
  • Battery sharing across DeWalt 20V tools is the main reason owners buy it.

Weaknesses

  • Battery and charger are sold separately, so the true entry cost sits well above the sticker price.
  • There is no E-Switch Protection: if the battery dies mid-cut, the tool stays off until you cycle the switch.
  • No independent instrumented test of this exact model exists.
  • The slide switch draws mixed reactions from owners used to paddle switches.
  • It overlaps confusingly with the older DCG405B and the cheaper paddle-switch DCG408B.
  • Special-order retailers charge $213–$232 for the same bare tool.

Verified specifications

ModelDCG407B, sold as “20V MAX* Brushless Cordless 4 1/2-In. Slide-Switch Grinder (Tool Only)”.
Voltage20V MAX* (20 V maximum initial battery voltage, 18 V nominal).
Motorbrushless, up to 850 MWO (Max Watts Out).
No-load speedup to 9,000 RPM.
Wheel size4-1/2 in.; DeWalt says it also accepts 4–5 in. wheels.
Switchslide switch with lock-on for continual operation.
Spindle5/8"-11 thread on a 5/8 in. arbor.
Bare tool weight3.55 lb.
Package dimensions13 × 6.75 × 5.563 in.
SafetyKickback Brake and E-Clutch, which stops the motor in under 0.1 s on a detected pinch or stall.
GuardsType B guard for grinding, clip-on guard for cutting, tool-free guard change.
Debris protectionmesh screens over the internals.
Warranty3 Year Limited Warranty, 1 Year Free Service, 90 Days Satisfaction Guaranteed.
Battery and chargersold separately; runs on the DeWalt 20V MAX* platform.
In the boxgrinder, side handle, clip-on guard, inner and outer flange, hex wrench.
Claimed runtimeup to 56 cuts of 1/2 in. rebar per charge with a DCB205 battery.
Country of originChina.
Full research notes and sources

Safety features

DeWalt equips the DCG407B with a Kickback Brake and an E-Clutch that shuts the motor down in under 0.1 s when it detects a pinch or stall, plus anti-rotation features. The guard changes without tools, and mesh screens block debris from entering the internals. Owners in r/Dewalt threads point to the brake and clutch as peace of mind when a wheel binds. Nobody has published a failure rate for these systems, so treat them as unproven over the long term rather than defective.

Battery platform and what’s in the box

The DCG407B is a bare tool — battery and charger are sold separately — built for DeWalt’s 20V MAX* battery platform. In the box: the grinder, a side handle, a clip-on cutting guard, inner and outer flanges and a hex wrench. DeWalt claims up to 56 cuts of 1/2 in. rebar per charge with a DCB205 battery; the battery and the DW8062 cutting wheel are sold separately, and real-world results vary with battery capacity, wheel type and material. The kit version, DCG407P1, adds a DCB205 battery and a DCB1106 charger. On the closely related DCG408B, Home Depot reviewers complain that the battery drains fast — one says it could grind a single weld tack — and that a $200 grinder should come with a battery. That friction runs across the lineup, not just this model.

Which model this is

The DCG407B is DeWalt’s brushless slide-switch grinder in the 20V MAX lineup. It is distinct from the older DCG405B — owners describe the DCG407 as the updated version of the DCG405 with slightly different handles — and from the paddle-switch DCG408B and the newer XR DCG413B. It lacks the E-Switch Protection found on the DCG413B and DCG416B. Some retailer listings conflate the DCG407B with the DCG405B, and one Walmart listing incorrectly claims 13,000 RPM; the correct figure is 9,000. The only hands-on test found was a 30-day deck rebuild with the predecessor DCG405B, which praised the slide-switch lock-on for longer cuts. Popular Mechanics’ 2024 grinder roundup linked a DeWalt 20V model at 8,000 RPM with a paddle switch — not this tool.

The Amazon listing for this tool is ASIN B007NVSS1W.

Is it worth it?

For buyers already on DeWalt 20V, the case is simple. Toolup had the tool at $179 in October 2026, The Power Tool Store at $199 and Shell Lumber at $185.30. Special-order retailers asked $213.15 to $232.09, and The Part Works wanted $276.31. A Walmart search snippet showed $128, though that listing also incorrectly claims 13,000 RPM, so treat it with suspicion. Home Depot Canada listed it at CAD 149. One Reddit owner reported paying $229 for a DCG407B with a 9 Ah battery. At $179 or below, the slide switch, E-Clutch and Kickback Brake make it fair value. Above $200, the newer XR paddle-switch DCG413B at $125 tool-only is hard to ignore. Without the battery ecosystem, tool, battery and charger together approach $300 — at that total, the calculus changes.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Retailers:

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