Worx WX812L.9 Grinder
- Grinder
- Battery
- 5.71 pounds
- 20 volts
Spins at 8500 RPM on Worx's cordless 20V platform, sized for compact, occasional grinding and cutting work.
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How it ranks among the 150 grinders we track
4.6★ across 207 Amazon ratings, Bayesian-smoothed toward the category average.
207 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand 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
The Worx WX812L.9 is a cordless 20 volt angle grinder spinning at 8500 RPM and weighing 2.59 kilograms, measuring about 5 by 5 by 13 inches.
8500 RPM sits within the typical range for angle grinders cutting or grinding metal and masonry discs. Running on Worx's 20V battery platform trades a cord for battery-dependent runtime, and at roughly 13 inches long it is sized like a standard compact grinder rather than a bulky one.
- 8500 RPM speed
- 20V battery powered
- 2.59 kilogram weight
- 5 x 5 x 13 inch size
Who it's for
Makes sense for DIYers and light-duty users wanting a cordless 20V grinder for occasional cutting or grinding jobs. Shop use needing sustained, all-day output asks more of a tool than this is built for.
Strengths and trade-offs
Drawn from this product's published specifications.
- Cordless 20V mobility
- 8500 RPM cutting and grinding speed
- Compact at about 13 inches long
- Battery runtime not specified
- At 2.59 kilograms, on the heavier side for a cordless grinder
Performance notes
Running on the 20V battery platform gives cord-free mobility, though cordless grinders generally deliver shorter sustained run time than corded models at comparable RPM. 8500 RPM falls within the usual range for cutting and grinding discs on metal or masonry.
Specifications
| Brand | WORX |
|---|---|
| Model | WX812L.9 |
| Power Source | Battery |
| Item Weight | 5.71 pounds |
| Voltage | 20 volts |
| Dimensions | 5 × 5 × 13 inches |
| Speed | 8500 rpm |
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Worx WX812L.9 GrinderThis product | 4.6 / 5 | 207 | 3.7 / 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 WORX WX812L.9
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What voltage does the WX812L.9 run on?
20 volts.
How fast does it spin?
8500 RPM.
How much does it weigh?
2.59 kilograms.