Astro 204 Grinder
- Grinder
- Pneumatic
- 1.2 pounds
A pneumatic detail grinder that only makes sense if you already have a compressor feeding your air line.
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
4.5★ across 181 Amazon ratings, Bayesian-smoothed toward the category average.
181 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 Astro 204 is a pneumatic grinder, meaning it runs off a compressed air line rather than a battery or cord. At 1.2 pounds it is light enough for one-handed detail grinding work.
Astro Pneumatic built its catalog around air-powered shop tools, and the 204's power source confirms it belongs to that category rather than the electric grinder segment some buyers might expect from the plain title. Anyone shopping this listing needs an air compressor and hose already in place, since the tool itself will not run without one.
- Brand: Astro
- Model: 204
- Category: Grinders
- Power source: pneumatic
Who it's for
Best for shops and garages that already run a compressor and want a light pneumatic grinder for detail or die-grinding work. Not a fit for anyone without compressed air on hand, or looking for a cordless electric option.
Strengths and trade-offs
Drawn from this product's published specifications.
- Light at 1.2 pounds for one-handed use
- Pneumatic power avoids battery weight
- Requires a compressor and air line to run
- No further specs on collet size or RPM
Performance notes
Pneumatic grinders draw power from a shop compressor through an air hose, which typically gives them a higher power-to-weight ratio than a similarly sized electric grinder. At 1.2 pounds the 204 is built for maneuvering into tight spots rather than for heavy stock removal.
Specifications
| Brand | Astro |
|---|---|
| Model | 204 |
| Power Source | Pneumatic |
| Item Weight | 1.2 pounds |
Other Astro grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Astro 204 GrinderThis product | 4.5 / 5 | 181 | 3.5 / 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 204
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the Astro 204 need a compressor?
Yes, it is pneumatic-powered, so it runs off a compressed air line rather than a battery or cord.
How much does the Astro 204 weigh?
It is listed at 1.2 pounds.
Is the Astro 204 cordless?
No, it is an air tool, not a battery or corded electric grinder.