1/4 315-22 Grinder
- Grinder
- 800 watts
- Pneumatic
- 1.94 pounds
- More reviewed than 83%
The 315-22 is a compact air-powered die grinder spinning to 20,000 RPM, weighing under a kilogram, with a 4.6 star average across 957 reviews.
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How it ranks among the 150 grinders we track
4.6★ across 957 Amazon ratings, Bayesian-smoothed toward the category average.
957 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
300+ bought on Amazon 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: 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
This 315-22 is an air-powered die grinder that spins up to 20,000 RPM, draws on an 800 watt motor, and weighs about 0.88 kilograms. The 1/4 in its listing title points to a quarter-inch collet size rather than a separate brand name.
The listing also carries a 115 volt figure, which is unusual for a pneumatic tool since air grinders run on compressed air rather than mains power, so that spec may refer to the compressor circuit rather than the grinder itself. Treat it as one detail to confirm before buying.
- Air powered die grinder
- 20,000 RPM speed
- 800 watt motor power
- 0.88 kilogram weight
Who it's for
Suits users needing a compact air die grinder for deburring, polishing or grinding in tight spots, provided they already run a compressed air line. Not for anyone without an air compressor, since this tool is air powered rather than corded or battery driven.
Strengths and trade-offs
Drawn from this product's published specifications.
- Compact at about 0.88 kilograms for one-handed use
- 20,000 RPM for fast material removal
- 4.6 star average across 957 reviews
- Requires a compressed air line to operate
- 115 volt spec is unclear for an air tool
Performance notes
Running on compressed air rather than a battery or cord, output stays consistent as long as air supply pressure holds, and the 20,000 RPM speed with an 800 watt motor rating suits fast material removal on small work. At 0.88 kilograms it stays light enough for one-handed use over longer sessions.
Specifications
| Brand | 1/4 |
|---|---|
| Model | 315-22 |
| Motor Power | 800 watts |
| Power Source | Pneumatic |
| Item Weight | 1.94 pounds |
| Voltage | 115 volts |
| Speed | 20000 rpm |
Other 1/4 grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| 1/4 315-22 GrinderThis product | 4.6 / 5 | 957 | 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 |
Similar grinders from other brands
Questions about the 1/4 315-22
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the 315-22 grinder need an air compressor?
Yes, it is listed as air powered rather than corded or battery.
How fast does the 315-22 grinder spin?
Up to 20,000 RPM, per the listing.
How much does the 315-22 grinder weigh?
About 0.88 kilograms.