Astro 218 Grinder
- Grinder
- Pneumatic
- 12.8 ounces
- 120 volts
- More reviewed than 85%
A light, high speed pneumatic die grinder built for detail grinding and deburring, provided you already have shop air available.
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How it ranks among the 150 grinders we track
4.6★ across 1,091 Amazon ratings, Bayesian-smoothed toward the category average.
1,091 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 Astro 218 is a pneumatic die grinder that spins up to 56,000 RPM while weighing just 12.8 ounces. Astro Pneumatic is an established name in shop air tools, and this compact, high speed build points to detail grinding and deburring work.
Running on shop air rather than an electric motor, this grinder trades cord freedom for a compressor requirement, standard for die grinders used on metalwork and fabrication benches. The 56,000 RPM speed is high even for the category, suited to small cutting and grinding bits rather than heavy material removal.
- 56,000 RPM top speed
- Pneumatic (air-powered)
- 12.8-ounce weight
- 4.6 average rating
Who it's for
Fits metalworkers and fabricators with a shop air compressor who need a light, high speed grinder for detail work like deburring and small cutoff wheels. Not a fit for anyone without compressed air on hand, since this is not a corded or battery tool.
Strengths and trade-offs
Drawn from this product's published specifications.
- High 56,000 RPM speed for detail work
- Light at 12.8 ounces for one-handed control
- Established Astro Pneumatic brand
- Requires a shop air compressor to operate
- Not built for heavy material removal
Performance notes
At 56,000 RPM this runs well above typical corded grinder speeds, which favors small bits and fine detail work over heavy stock removal, and the 12.8 ounce weight keeps it easy to control one handed.
Specifications
| Brand | Astro |
|---|---|
| Model | 218 |
| Power Source | Pneumatic |
| Item Weight | 12.8 ounces |
| Voltage | 120 volts |
| Speed | 56000 rpm |
Other Astro grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Astro 218 GrinderThis product | 4.6 / 5 | 1,091 | 4.2 / 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 Astro 218
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How is the Astro 218 powered?
It runs on compressed shop air rather than a cord or battery.
How fast does it spin?
Up to 56,000 RPM.
How much does it weigh?
12.8 ounces.