Astro Pneumatic 219 ONYX 3-Piece Die Grinder Kit
- Maximum Rotational Speed: 25000 rpm
- Power Source: Pneumatic
- Item Weight: 3.2 pounds
- Color: Black, Red
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A light, high speed air grinder for detail work, of no use without a shop air compressor to run it.
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ASIN: B007QV1RGMModel: 219Category: Power Grinders
Overview
The Astro 219 is a pneumatic grinder that spins up to 25,000 RPM and weighs 3.2 pounds, sized for detail grinding, deburring and polishing work powered by shop air rather than a battery or cord.
Pneumatic die grinders trade battery weight and runtime concerns for reliance on a shop air compressor, and in exchange they tend to run lighter and spin faster than their cordless counterparts. That combination of high RPM and low weight points this tool toward fine detail work rather than heavy stock removal.
- Pneumatic powered
- 25,000 RPM top speed
- 3.2 pound weight
- Astro branded grinder
Who it's for
Fits mechanics, metalworkers and hobbyists who already have shop air and need a light, fast grinder for deburring or polishing. Not useful to anyone without an air compressor on hand, since it cannot run cordless or corded.
Pros and cons
- Light at 3.2 pounds for extended handheld use
- 25,000 RPM suits fine detail grinding and deburring
- Requires an air compressor, cannot run cordless
- Air pressure and CFM requirements are not listed
Performance notes
At 25,000 RPM the tool is geared toward fine grinding, deburring and polishing rather than heavy material removal, and its 3.2 pound weight keeps it maneuverable through extended handheld sessions. Required air pressure and CFM are not part of the listed spec, so compressor sizing should be confirmed separately.
Specifications
| Brand | Astro |
|---|---|
| Model | 219 |
| Dimensions & fit | |
| Item Weight | 3.2 poundslower than 57% of 107 power grinders |
| Dimensions | 12.5 × 8.2 × 1.7 inches |
| Capacity & performance | |
| Maximum Rotational Speed | 25000 rpmhigher than 85% of 122 power grinders |
| Power & efficiency | |
| Power Source | Pneumatic |
| Construction & materials | |
| Color | Black, Red |
| Included components | |
| Unit Count | 1 |
| Included Components | Funnel |
| Other details | |
| Style Name | Mini |
| Other Special Features Of The Product | Compact |
| Recommended Uses For Product | Grinding, Polishing, Sanding, Sharpening |
Closest rivals on specs
SEESII DG21 Pro Cordless Right Angle Die Grinder Kit- Item Weight 3.2 vs 2.5 pounds (+28%)
Frequently asked questions
Does the Astro 219 need an air compressor?
Yes, it is pneumatic powered rather than battery or corded, per the listed power source.
How fast does it spin?
Up to 25,000 RPM, per the listed speed spec.
How much does it weigh?
3.2 pounds, per the listed item weight.