Chicago Pneumatic
Chicago Pneumatic CP9122BR Angle Grinder 4 1/2 in 0.8 hp 12000 RPM 1/4 in NPT
Compact pneumatic angle grinder for 4 1/2 inch type 27 wheels delivering 0.8 hp at 12,000 RPM with a 1/4 in NPT air inlet
- TypeGrinders
- 8 hp motor drives 12,000 RPM for fast material removal
- 4 1/2 in wheel suits Type 27 abrasives in grinding and cutting
- 1/4 in NPT female air inlet fits standard shop couplings
- 5/8 in -11 spindle thread accepts common accessories
- Medium-duty rating matches automotive and fabrication tasks
Angle Grinder for Medium-Duty Work
The Chicago Pneumatic CP9122BR is a pneumatic angle grinder built for medium-duty applications. It accepts Type 27 wheels with a 4 1/2 in diameter and runs at a maximum speed of 12,000 RPM. The tool delivers 0.8 hp through a lever throttle and a 5/8 In.-11 spindle. It suits technicians and metalworkers who need a compact air-powered grinder for cutting, grinding, or surface preparation.
Air Supply and Mounting Requirements
The grinder connects to a compressed-air line through a 1/4 in NPT female inlet. A suitable air hose and coupler matching that thread are required for operation. The standard-reach body keeps the wheel close to the work surface, while the lever throttle allows controlled starts without a separate trigger lock. No electrical supply is needed, freeing the user from cable management and power-outlet placement.
Sustained Operation Characteristics
Under continuous load the 0.8 hp motor maintains torque for extended material removal. The lever throttle lets the operator feather speed to manage heat buildup on the wheel and workpiece. Because the tool has no variable-speed setting, the operator controls pace by modulating air flow rather than an electronic governor. The medium-duty rating indicates it is designed for regular shop use rather than constant heavy production cycles.
Highlights
- 8 hp motor drives 12,000 RPM for fast material removal
- 4 1/2 in wheel suits Type 27 abrasives in grinding and cutting
- 1/4 in NPT female air inlet fits standard shop couplings
- 5/8 in -11 spindle thread accepts common accessories
- Medium-duty rating matches automotive and fabrication tasks
Specifications
| Type | Grinders |
|---|---|
| Brand | Chicago Pneumatic |
Questions about this item
What is the first limit reached during sustained grinding with the 0.8 hp motor?
The 12,000 RPM maximum speed is the primary limit under continuous load.
How much noise and heat does the CP9122BR produce when running all day?
The medium-duty lever design runs at 12,000 RPM; extended use generates typical pneumatic tool noise and motor heat.
What existing air supply components are required to operate the 1/4 in NPT female inlet?
You need a 1/4 in NPT male fitting on your air hose and a compressor that can deliver the required flow for 0.8 hp operation.
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