DEWALT DCG405B Grinder Review
Our verdict
The DEWALT DCG405B is a well-rounded 20V MAX cordless angle grinder with an 850-watt motor, 9000 RPM, and 4.7 stars from 1,800 buyers, offering a strong combination of platform reliability and active market demand at $144.60.
Check price on AmazonBest for
DEWALT 20V MAX platform users who want a capable cordless angle grinder for regular jobsite or shop use with a balance of power and manageable weight.
Skip if
Buyers who need higher voltage for demanding sustained cuts, or those who cannot absorb the added cost of a 20V MAX battery if not already owned.
- Power Source Battery Powered
- Voltage 20 Volts
- Speed 9000 rps
- Motor 850 watts
- Weight 3.8 Pounds
- Priced 47% above the category median ($98.50 across 92 tracked models)
Our scorecard
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Owner rating4.7/5
4.7 average across 1,800 owner ratings
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Popularity4.3/5
1,800 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other power tools and workshop machinery we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The DEWALT DCG405B pairs an 850-watt motor with a 9000 RPM no-load speed on the DEWALT 20V MAX battery platform. At 3.8 pounds it is one of the lighter cordless grinders in this batch, which reduces fatigue during extended overhead or vertical grinding sessions. The $144.60 tool-only price sits in the mid-range of the cordless options reviewed here.
Owners who already own DEWALT 20V MAX batteries from other tools can put the DCG405B to work immediately, making it one of the most practical choices for anyone already embedded in that ecosystem. The 850-watt output is a solid rating for a 20V grinder, and the 9000 RPM speed supports grinding, cutting, and wire brushing applications.
With 1,800 reviews at 4.7 stars and 400 units bought last month, the DCG405B holds steady demand. The combination of established brand support, high owner satisfaction, and continued purchase velocity makes it one of the more confident buys in this cordless grinder batch.
Pros
- 4.7-star rating from 1,800 reviews reflects consistent owner confidence
- 850-watt motor output is strong for a 20V cordless grinder
- 9000 RPM no-load speed suits grinding, cutting disc work, and wire brushing
- 3.8 pounds is lighter than many competing cordless models, reducing fatigue
- 400 units bought last month confirms active ongoing demand
Cons
- $144.60 is tool only, requiring a separate DEWALT 20V MAX battery and charger purchase for new users
- 20V platform has power limits on extended heavy metalwork compared to 60V FLEXVOLT options
Specifications
| Power Source | Battery Powered |
|---|---|
| Voltage | 20 Volts |
| Speed | 9000 rps |
| Motor | 850 watts |
| Weight | 3.8 Pounds |
Performance notes
Battery-powered via DEWALT 20V MAX platform. Motor output is 850 watts. No-load speed is 9000 RPM. Tool weight is 3.8 pounds. The combination of low weight and 850W output makes this grinder practical for users doing repetitive grinding tasks where arm fatigue is a concern.
What buyers say
Based on 1,800 reviews at 4.7 stars, owners regularly cite the DCG405B as a reliable everyday grinder within the DEWALT ecosystem. Common praise points include its light weight and consistent performance. The main recurring note is that the tool-only packaging means buyers coming to DEWALT fresh must budget for a battery as well.
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Frequently asked questions
Is the DEWALT DCG405B compatible with all DEWALT 20V MAX batteries?
The DCG405B runs on the DEWALT 20V MAX platform. Most standard 20V MAX batteries are compatible, though performance varies with battery capacity. Check DEWALT's compatibility specifications for the specific battery packs you plan to use.
How does the DCG405B compare to the DCG416B?
Both are 20V MAX grinders at 9000 RPM. The DCG416B lists a higher motor output at 1550 watts and a lighter 16-ounce weight, while the DCG405B lists 850 watts and 3.8 pounds. Both carry 4.7-star ratings. The DCG416B has higher recent purchase volume.
Questions about the DEWALT DCG405B?
Contact the ToolGalaxy research team at hello@toolgalaxy.com for further help.