Ryobi 5133001903 Grinder
- Grinder
- 4 watts
- Battery
- 5.78 pounds
- More reviewed than 95%
A cordless 18V angle grinder spinning up to 9000 RPM, suited to occasional grinding and cutting for owners already on the Ryobi battery platform.
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How it ranks among the 150 grinders we track
4.6★ across 4,625 Amazon ratings, Bayesian-smoothed toward the category average.
4,625 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: 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 Ryobi 5133001903 is a battery powered angle grinder on the 18 volt platform, spinning up to 9000 RPM with a listed motor power around 4 horsepower equivalent and a unit weight of 2.62 kilograms.
Ryobi's cordless grinders trade the constant power of corded models for battery convenience, and the 2.62 kilogram weight and 9000 RPM disc speed place this in line with compact cordless angle grinders meant for cutting, grinding and light metal work rather than heavy fabrication.
- 18 volt battery power
- 9000 RPM disc speed
- Approx. 4 HP motor rating
- 2.62 kilogram weight
Who it's for
DIYers and homeowners on the Ryobi 18V platform who want a cordless angle grinder for occasional cutting, grinding or rust removal. Less suited to tradespeople running a grinder all day, where a corded model avoids battery swaps.
Strengths and trade-offs
Drawn from this product's published specifications.
- Cordless convenience on the Ryobi 18V platform
- 9000 RPM suits cutting and grinding tasks
- 2.62 kilogram weight keeps it maneuverable
- Battery runtime limits continuous heavy use
- Not built for all-day fabrication work
Performance notes
9000 RPM disc speed is typical for cordless angle grinders and enough for cutting, grinding and rust or paint removal on smaller jobs. At 2.62 kilograms it is light enough to control one-handed for short stretches, though battery runtime will limit continuous use compared to a corded grinder.
Specifications
| Brand | RYOBI |
|---|---|
| Model | 5133001903 |
| Motor Power | 4 watts |
| Power Source | Battery |
| Item Weight | 5.78 pounds |
| Voltage | 18 volts |
| Speed | 9000 rpm |
Other RYOBI grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Ryobi 5133001903 GrinderThis product | 4.6 / 5 | 4,625 | 4.4 / 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 |
Similar grinders from other brands
Questions about the RYOBI 5133001903
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What voltage does the Ryobi 5133001903 grinder run on?
18 volts, on Ryobi's cordless battery platform.
How fast does the Ryobi 5133001903 spin?
Up to 9000 RPM, per the listed speed.
How much does the Ryobi 5133001903 weigh?
2.62 kilograms, per the item weight spec.