Chicago Pneumatic
Chicago Pneumatic CP9120CRN Angle Grinder 0.8 hp 12000 RPM 1/4 in NPT
Air angle grinder with 0.8 hp motor reaching 12,000 RPM for 4-inch Type 27 wheels
- MaterialHAWA
- 8 hp motor delivers strong grinding force
- 12000 RPM max speed cuts material quickly
- 4 inch wheel suits Type 27 abrasives
- 1/4 in NPT female inlet connects to standard air lines
- Variable speed lever gives precise control
CP9120CRN Angle Grinder for Medium-Duty Metalwork
The Chicago Pneumatic CP9120CRN is a pneumatic angle grinder built for medium-duty fabrication and finishing tasks. It accepts Type 27 wheels up to four inches in diameter and runs at a maximum speed of 12,000 RPM. A 0.8 hp motor drives the spindle, which uses a 3/8 in.-24 thread. The tool connects to a compressed-air supply through a 1/4 in NPT female inlet.
Upgrade from Lower-Power or Fixed-Speed Grinders
This model replaces grinders that lack variable-speed control or deliver less than 0.8 hp. The lever throttle lets the operator adjust speed to match the wheel and material, reducing the risk of gouging or overheating. The step up is worth it when the work demands consistent torque across a range of wheel types and when a standard-reach body fits the workspace.
Steady Output During Extended Grinding Sessions
Under sustained load the 0.8 hp motor maintains torque without the sharp drop-off common in lower-rated air tools. The lever-style throttle provides fine modulation so the wheel speed stays stable during long passes on welds or heavy stock removal. Medium-duty construction and standard reach keep the tool balanced for prolonged use without excessive vibration.
Highlights
- 8 hp motor delivers strong grinding force
- 12000 RPM max speed cuts material quickly
- 4 inch wheel suits Type 27 abrasives
- 1/4 in NPT female inlet connects to standard air lines
- Variable speed lever gives precise control
Specifications
| Brand | CHICAGO PNEUMATIC |
|---|---|
| Material | HAWA |
Questions about this item
What size air hose fitting does the 1/4 in NPT female inlet require?
The grinder has a 1/4 in NPT female air inlet, so it needs a male 1/4 in NPT fitting on the hose.
How do you attach a Type 27 wheel to the 3/8-24 spindle?
Thread the wheel onto the 3/8-24 spindle and tighten with the supplied wrench; the lever throttle must be off while changing wheels.
When should the air motor vanes be inspected or replaced?
Inspect vanes if power drops below 0.8 hp or speed falls under 12,000 RPM; replace them when worn to the service limit.
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