Astro Pneumatic 1221 Die Grinder Kit with Carbide Burr Set
- Maximum Rotational Speed: 25000 rpm
- Power Source: Pneumatic
- Manufacturer Warranty Description: 1 year warranty on material and workmanship
- Item Weight: 0.1 pounds
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A pneumatic grinder aimed at shops with compressed air already on hand, valued mainly for its 25,000 RPM speed on small grinding and deburring tasks.
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ASIN: B004EYO4KUModel: 1221Category: Power Grinders
Overview
The Astro 1221 is a pneumatic powered grinder rated to spin at up to 25,000 RPM, built for air tool users who need a high speed rotary tool for grinding, deburring or polishing metal.
Running on shop air rather than a battery or cord, this grinder relies on a compressor for power, typical of Astro Pneumatic's line of small air tools aimed at auto body and metal fabrication work. High RPM tools like this are chosen for fast material removal on small areas rather than heavy stock removal.
- Pneumatic powered
- 25,000 RPM top speed
- Astro Pneumatic 1221 model
- Suited to deburring and metal finishing
Who it's for
Suits shops and DIYers who already have a compressed air setup and need a fast spinning grinder for small grinding, deburring or polishing jobs. Not useful without an air compressor, since it has no battery or cord option.
Pros and cons
- 25,000 RPM for fast small area grinding
- No battery to charge or cord to manage
- Requires a compressed air source to operate
- No stated air pressure or CFM requirement
Performance notes
The 25,000 RPM rating places this well above typical corded die grinders, which suits fast material removal on small spots like weld cleanup or deburring, though pneumatic tools of this type generally need steady air pressure to hold that speed.
Specifications
| Brand | Astro |
|---|---|
| Model | 1221 |
| Dimensions & fit | |
| Item Weight | 0.1 poundslower than 100% of 107 power grinders |
| Dimensions | 12 × 7 × 2 inches |
| Capacity & performance | |
| Maximum Rotational Speed | 25000 rpmhigher than 85% of 122 power grinders |
| Power & efficiency | |
| Power Source | Pneumatic |
| Construction & materials | |
| Color | Blue |
| Included components | |
| Unit Count | 1 |
| Included Components | Funnel |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year warranty on material and workmanship |
| Other details | |
| Style Name | Mini |
| Other Special Features Of The Product | Angle Die Grinder |
Closest rivals on specs
WORKPRO W182004A Straight Air Die Grinder 1/4 Inch- Item Weight 0.1 vs 0.27 pounds (-63%)
DEWALT DWMT70783 Straight Die Grinder- Item Weight 0.1 vs 0.5 pounds (-80%)
EMAX Straight Shaft Air Die Grinder 1/4 Inch- Item Weight 0.1 vs 0.81 pounds (-88%)
Frequently asked questions
Does the Astro 1221 need an air compressor?
Yes, it is pneumatic powered and requires a compressed air source.
How fast does it spin?
Up to 25,000 RPM.
What is it typically used for?
High speed grinding, deburring and polishing tasks on metal.