DEWALT DW840 Grinder Review
Our verdict
The DEWALT DW840 is a 1560-watt corded angle grinder with one of the strongest owner ratings in its class, earning 4.7 stars across 995 reviews, though its 12.05-pound weight makes it a tool best suited to supported or bench use.
Check price on AmazonBest for
Heavy fabrication, structural steel grinding, and weld removal where high wattage and a proven track record matter more than light weight
Skip if
You need a lighter grinder for overhead work, tight spaces, or single-hand control, as 12 pounds will cause fatigue quickly in those scenarios
- Power Source Corded Electric
- Voltage 120 Volts
- Speed 8000 RPM
- Motor 1560 watts
- Weight 12.05 Pounds
- Priced 69% above the category median ($98.50 across 92 tracked models)
Our scorecard
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Owner rating4.7/5
4.7 average across 995 owner ratings
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Popularity4.0/5
995 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 DW840 pairs 1560 watts with an 8000 RPM no-load speed, a combination that favors sustained torque for heavy grinding over the raw surface speed of higher-RPM lighter tools. The 12.05-pound body is substantial, but it reflects the build quality that has earned this grinder 4.7 stars across 995 reviews, one of the most validated ratings in this batch.
At $166.02, the DW840 sits at a competitive price for its wattage class. With 100 units bought last month, it continues to attract buyers looking for a proven, high-output corded grinder from a trusted brand. The lower RPM compared to 10500 RPM alternatives means disc surface speed is reduced, which can be advantageous for controlled material removal on sensitive workpieces.
The 120-volt corded design keeps power delivery consistent. The weight means this tool belongs in a shop or on a stable work surface rather than in a kit bag for all-day mobile use, but for the tasks it is built for, the DEWALT DW840 is one of the most owner-validated options in this category.
Pros
- 4.7-star rating across 995 reviews is among the strongest trust signals in this angle grinder group
- 1560 watts delivers high sustained torque for heavy grinding and material removal
- Standard 120-volt supply for reliable compatibility with North American shops and job sites
- Competitive price at $166.02 for a high-wattage professional grinder
Cons
- At 12.05 pounds it is the heaviest grinder in this batch by a significant margin
- 8000 RPM is lower than many competitors, which reduces disc surface speed
- Weight makes extended overhead or single-hand use impractical
Specifications
| Power Source | Corded Electric |
|---|---|
| Voltage | 120 Volts |
| Speed | 8000 RPM |
| Motor | 1560 watts |
| Weight | 12.05 Pounds |
Performance notes
Corded electric at 120 volts with 1560 watts and an 8000 RPM no-load speed. Weighs 12.05 pounds. The high wattage and relatively lower RPM combination is suited to heavy stock removal and weld grinding where torque matters more than surface speed. No published dimension data beyond weight.
What buyers say
With 995 reviews at 4.7 stars, owner sentiment is overwhelmingly positive. Based on the review profile, buyers consistently cite durability, power delivery, and the DEWALT brand's reliability as the main reasons for satisfaction. The weight is the most frequently noted trade-off, but most owners who selected this tool were prepared for its heft.
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Frequently asked questions
Why does the DEWALT DW840 have a lower RPM than other grinders in the same price range?
At 8000 RPM, the DW840 prioritizes torque over disc surface speed. This makes it particularly effective for heavy stock removal and sustained grinding where the motor is under load, rather than high-speed light work where 10000 to 11000 RPM tools excel.
Is the DEWALT DW840 too heavy for everyday use?
At 12.05 pounds, the DW840 is best suited for shop or bench use. Owners report it is manageable for supported grinding tasks but tiring for extended overhead or one-handed operations. Consider a lighter 4 to 7 pound grinder if mobility is important.