DEWALT DW840 Grinder
- Grinder
- 1560 watts
- Corded electric
- 12.05 pounds
- Better rated than 66%
- More reviewed than 83%
A heavy, high-torque corded grinder built for sustained heavy-duty work, backed by a strong 4.7-star rating across nearly 1,000 reviews.
As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.
How it ranks among the 150 grinders we track
4.7★ across 995 Amazon ratings, Bayesian-smoothed toward the category average.
995 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
100+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 150 grinders we track - how the scorecard works · full grinders data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The DeWalt DW840 is a corded electric angle grinder running on 120 volts with an 8,000 RPM top speed and a 1,560-watt motor. At 12.05 pounds, it is built for sustained, heavy-duty grinding rather than light touch-up work.
The combination of a 1,560-watt motor and 12-pound-plus weight points to a large-format grinder meant for demanding metalworking or fabrication tasks rather than compact detail grinding. Running at 8,000 RPM, it trades top-end speed for torque and stability under load, a common tradeoff in large angle grinders built to handle bigger wheels. It carries a 4.7-star rating across 995 reviews, backing up its use as a workhorse rather than an occasional-use tool.
- 1,560-watt corded motor
- 8,000 RPM top speed
- Weighs 12.05 pounds
- Runs on 120 volts
Who it's for
Metalworkers, fabricators, and tradespeople who need a corded, high-power grinder for heavy material removal or cutting over long sessions. Less suited to anyone wanting a lightweight, cordless grinder for occasional light-duty jobs.
Strengths and trade-offs
Drawn from this product's published specifications.
- High 1,560-watt motor power
- Stable weight for heavy-duty grinding
- Strong 4.7-star rating
- Heavier at over 12 pounds
- Corded, not portable like battery models
- Lower top speed than compact grinders
Performance notes
The 1,560-watt motor combined with a 12.05-pound body gives this grinder the mass and power to maintain speed under load, which matters most when cutting or grinding thick material where a lighter tool would bog down. At 8,000 RPM it runs slower than compact high-speed grinders, a tradeoff that typically favors control and torque over raw surface speed.
Specifications
| Brand | DeWalt |
|---|---|
| Model | DW840 |
| Motor Power | 1560 watts |
| Power Source | Corded electric |
| Item Weight | 12.05 pounds |
| Voltage | 120 volts |
| Speed | 8000 rpm |
Other DeWalt grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| DEWALT DW840 GrinderThis product | 4.7 / 5 | 995 | 4.2 / 5 |
| Milwaukee 2880-20 GrinderMILWAUKEE | 4.8 / 5 | 2,400 | 4.5 / 5 |
| AVID MW590 GrinderAVID | 4.5 / 5 | 6,100 | 4.4 / 5 |
| Makita 9557PBX1 GrinderMAKITA | 4.8 / 5 | 3,960 | 4.4 / 5 |
| CRAFTSMAN CMCG400B GrinderCraftsman | 4.7 / 5 | 2,900 | 4.4 / 5 |
Similar grinders from other brands
Questions about the DeWalt DW840
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Is the DeWalt DW840 corded or cordless?
It is corded electric, running on 120 volts.
How much does it weigh?
12.05 pounds.
What is its motor power and top speed?
A 1,560-watt motor with an 8,000 RPM top speed.