Cordless 4-1/2 Angle Grinder DW-20V
- Grinder
- Battery
- 4.5 pounds
- 7500 rpm
A straightforward cordless 4-1/2 inch grinder with a fast 7500 RPM disc speed and a manageable 4.5 pound body, worth a look for light to moderate cutting and grinding jobs.
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How it ranks among the 150 grinders we track
4.1★ across 98 Amazon ratings, Bayesian-smoothed toward the category average.
98 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
300+ 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: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This is a cordless 4-1/2 inch angle grinder built for cutting, grinding and surface prep without a power cord. It runs on battery power at 7500 RPM and weighs 4.5 pounds, putting it in the range of a compact one-handed grinder for metal fabrication, welding cleanup and masonry work.
Angle grinders in the 4-1/2 inch class are a standard size for disc and wheel attachments sold at most hardware stores, so this model should accept the same wheels as corded 4-1/2 inch grinders. The listing does not specify battery voltage, amp hours or whether a battery and charger ship with the tool, so check the product images before buying if that matters.
- 4-1/2 inch angle grinder
- Battery powered, no cord needed
- 7500 RPM no-load speed
- 4.5 pounds total weight
Who it's for
Suited to anyone doing occasional metal cutting, deburring or masonry grinding around a shop or job site who wants to skip a power cord. Less suited to users who need all day continuous grinding, since battery runtime is not listed.
Strengths and trade-offs
Drawn from this product's published specifications.
- Cordless operation for tight or outdoor spaces
- 7500 RPM disc speed
- 4.5 pound body eases one-handed use
- Battery voltage and capacity not listed
- Charger inclusion not stated
Performance notes
Disc speed is rated at 7500 RPM, in line with typical 4-1/2 inch grinders, so it should handle common cutting and grinding wheels. Being battery powered, actual runtime and power under load will depend on the battery pack used, which is not detailed in this listing.
Specifications
| Brand | Cordless |
|---|---|
| Power Source | Battery |
| Item Weight | 4.5 pounds |
| Speed | 7500 rpm |
Other Cordless grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Cordless 4-1/2 Angle Grinder DW-20VThis product | 4.1 / 5 | 98 | 3.8 / 5 |
| DEWALT DCG413B GrinderDeWalt | 4.8 / 5 | 9,600 | 4.6 / 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 |
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Questions about the Cordless grinders
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is the disc speed of the DW-20V angle grinder?
It runs at 7500 RPM, a standard speed for 4-1/2 inch cutting and grinding discs.
How much does the DW-20V weigh?
4.5 pounds, which keeps it manageable for one-handed grinding and cutting tasks.