Chicago CP9104Q Grinder
- Grinder
- Pneumatic
- 7 ounces
- 40 volts
For shops already running compressed air, a 60,000 RPM pneumatic grinder this light is a reasonable pick for detail grinding and deburring work.
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How it ranks among the 150 grinders we track
4.5★ across 133 Amazon ratings, Bayesian-smoothed toward the category average.
133 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand 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: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Chicago CP9104Q is an air powered die grinder built for high speed work such as deburring, port work and light grinding where a cord would get in the way. At 7.04 ounces it stays light through long sessions.
Chicago Pneumatic tools built its name in air powered shop equipment, and this die grinder follows that pattern: small footprint, high RPM ceiling, no motor to overheat. Buyers should confirm compressor CFM and fitting size before ordering, since air tools only perform to the spec of the air feeding them. There is no accessory kit listed here, so a collet or bit may be a separate purchase.
- Pneumatic power source
- 60,000 RPM top speed
- 7.04 ounce weight
- Chicago Pneumatic (CP) model line
Who it's for
Suits metalworkers, fabricators and auto technicians who already run a compressor and need a small grinder for tight spaces. Not a fit for anyone without a shop air line, since this tool has no battery or cord option.
Strengths and trade-offs
Drawn from this product's published specifications.
- Very light at 7.04 ounces for extended use
- High 60,000 RPM ceiling for detail grinding
- Compact pneumatic head fits tight spaces
- Requires a compressor, no cordless option
- No accessories or collet specified
Performance notes
Speed here comes from air pressure rather than a motor winding, so output stays consistent as long as the compressor keeps up with demand at 60,000 RPM. The pneumatic design also keeps the tool head small and light at 7.04 ounces, which matters more than raw power in tight, awkward grinding spots.
Specifications
| Brand | Chicago |
|---|---|
| Model | CP9104Q |
| Power Source | Pneumatic |
| Item Weight | 7 ounces |
| Voltage | 40 volts |
| Speed | 60000 rpm |
Other Chicago grinders
How it compares
This product against the closest alternatives we track in grinders.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Chicago CP9104Q GrinderThis product | 4.5 / 5 | 133 | 3.6 / 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 Chicago CP9104Q
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What powers the Chicago CP9104Q grinder?
It runs on compressed air, so it needs a shop compressor rather than a battery or cord.
How fast does the CP9104Q spin?
It is rated to 60,000 RPM, in line with other pneumatic die grinders built for detail work.
How much does the CP9104Q weigh?
It weighs 7.04 ounces, light enough for extended one handed use.