1/4 315-22 Grinder Review
Our verdict
The 315-22 is an air-powered die grinder with an 800-watt motor and 20,000 RPM free speed, priced at $35.58. With 957 reviews at 4.6 stars and 300 monthly buyers, it is one of the highest-validated options in the budget pneumatic die grinder market.
Check price on AmazonBest for
Mechanics and metal fabricators who want a high-confidence, budget-priced air die grinder with solid power output.
Skip if
You require a published collet size for accessory selection, or you need cordless operation on the job site.
- Power Source Air Powered
- Voltage 115 Volts
- Speed 20000 RPM
- Motor 800 watts
- Weight 0.88 Kilograms
- Priced 58% below the category median ($85.49 across 39 tracked models)
Our scorecard
-
Owner rating4.6/5
4.6 average across 957 owner ratings
-
Popularity4.5/5
957 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other power tools and workshop machinery we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The 315-22 die grinder pairs an 800-watt motor with a 20,000 RPM free speed to tackle deburring, grinding, porting, and finishing work. At 0.88 kilograms (roughly 1.94 pounds) it is heavier than the lightest pneumatic options but still manageable for sustained hand use.
With 957 reviews averaging 4.6 stars and 300 units sold last month, buyer confidence in the 315-22 is among the highest in this price tier. At $35.58 it undercuts most 800-watt die grinders by a meaningful margin, making it a compelling choice for shops watching tool budgets.
The listing references 115 volts alongside air-powered operation, which is unusual for a purely pneumatic tool. Buyers should verify the power source with the seller to confirm whether this is a dual-mode or strictly pneumatic unit before purchase.
Pros
- 800-watt motor delivers strong power output at this price point
- 4.6-star average from 957 reviews is a high-confidence validation
- 300 units sold last month confirms strong ongoing demand
- 0.88-kg weight is workable for extended use
- Under $36 pricing undercuts comparable-spec competitors
Cons
- Conflicting power source listing (air-powered plus 115V) requires pre-purchase clarification
- Collet diameter is not specified, complicating accessory selection
- Heavier than sub-200g pneumatic die grinders in the same category
Specifications
| Power Source | Air Powered |
|---|---|
| Voltage | 115 Volts |
| Speed | 20000 RPM |
| Motor | 800 watts |
| Weight | 0.88 Kilograms |
Performance notes
Listed as air-powered with a 115-volt spec also noted. Motor output is 800 watts and free speed is 20,000 RPM. Weight is 0.88 kilograms. Buyers should confirm the actual power source requirement before connecting to a compressor or outlet.
What buyers say
At 4.6 stars from 957 reviews, the 315-22 enjoys one of the stronger owner satisfaction scores in the budget air die grinder segment. High monthly sales of 300 units suggest repeat trade purchases. Buyers in this segment commonly value easy burr-change access and smooth air throttle control.
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Frequently asked questions
Is the 315-22 die grinder strictly air-powered or does it also use AC power?
The listing shows both air-powered and 115-volt specifications. Confirm the actual power requirement with the seller before use to avoid damage or safety issues.
What is the collet size on the 315-22 die grinder?
The collet diameter is not published in the listing. Verify with the seller before purchasing rotary burrs or grinding bits.
Have a question the listing does not answer?
Reach out to the ToolGalaxy research team at hello@toolgalaxy.com.