Astro

Astro 218 Grinder

Grinder
Pneumatic
12.8 ounces
120 volts

4.6/ 5 on Amazon1,091Amazon ratings100+bought last month4.2ProductDome score

More reviewed than 85%

High confidenceLast refreshed Aug 4, 2026Amazon data + ProductDome analysis · methodology

Best forYou have a shop air compressor and need a light, high speed die grinder

A light, high speed pneumatic die grinder built for detail grinding and deburring, provided you already have shop air available.

As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.

ProductDome scorecard

How it ranks among the 150 grinders we track

4.2/ 5ProductDome scoreHigh confidence

Owner satisfaction · 56% of scorecategory median 4.6★4.6

4.6★ across 1,091 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 256 ratings3.8

1,091 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score2.7

100+ bought on Amazon last month.

Data quality · 11% of score3.8

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.

What stands out

High 56,000 RPM speed for detail work
Light at 12.8 ounces for one-handed control
Established Astro Pneumatic brand

What to check first

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

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

Frequently asked

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.