Astro Pneumatic 218 Pencil Die Grinder 1/8 Inch
- Maximum Rotational Speed: 56000 rpm
- Power Source: Pneumatic
- Manufacturer Warranty Description: Manufacturer Warranty
- Voltage: 120 volts
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A light, high speed pneumatic die grinder built for detail grinding and deburring, provided you already have shop air available.
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ASIN: B000RH36WUModel: 218Category: Power Grinders
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.
Pros and cons
- 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 Pneumatic |
|---|---|
| Model | 218 |
| Dimensions & fit | |
| Item Weight | 0.8 poundslower than 92% of 107 power grinders |
| Dimensions | 5.2 × 14.5 × 19.7 inches |
| Capacity & performance | |
| Maximum Rotational Speed | 56000 rpmhigher than 100% of 122 power grinders |
| Minimum Speed | 56000 rpm |
| Power & efficiency | |
| Power Source | Pneumatic |
| Voltage | 120 voltshigher than 52% of 103 power grinders |
| Construction & materials | |
| Color | Black |
| Included components | |
| Unit Count | 1 |
| Included Components | Astro Pneumatic Tool 218 1/8" Pencil Type Die Grin |
| Warranty & support | |
| Manufacturer Warranty Description | Manufacturer Warranty |
| Other details | |
| Style Name | 1-PACK |
| Item Type Name | Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56, 000RPM, Black, Gold, Blue, 42377 |
| Other Special Features Of The Product | Lightweight |
| Recommended Uses For Product | Cleaning, Grinding, Polishing |
Closest rivals on specs
Makita XAG25Z 18V LXT Brushless X-Lock Angle Grinder- Item Weight 0.8 vs 1 pounds (-20%)
NEIKO 10649A Micro Air Die Grinder 1/8 Inch- Item Weight 0.8 vs 0.25 pounds (+220%)
Gunpla AT-010K Micro Air Pencil Die Grinder Kit- Item Weight 0.8 vs 0.33 pounds (+142%)
Frequently asked questions
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.