SPEEDAIRE
SPEEDAIRE 21AA89 Type 27 Angle Grinder 0.7 hp 11000 RPM 1/4 in NPT Female Air Inlet Medium Duty
A medium-duty angle grinder runs at 0.7 hp with a 4 in wheel and a safety throttle lever
- 7 hp motor delivers strong grinding power
- 11,000 RPM maximum speed for fast material removal
- Type 27 wheel compatibility for versatile grinding tasks
- Safety throttle lever prevents accidental starts
- 1/4 in NPT female air inlet fits standard shop airlines
SPEEDAIRE 21AA89 Angle Grinder Overview
The SPEEDAIRE 21AA89 is a pneumatic angle grinder built for medium-duty metalworking tasks. It delivers 0.7 horsepower with a maximum speed of 11000 RPM for grinding and cutting operations. The tool accepts Type 27 wheels with a 3/8-24 spindle thread for secure attachment. A safety throttle lever helps prevent accidental startup during handling.
Air Supply and Workspace Integration
This grinder connects via a 1/4 inch NPT female air inlet compatible with standard shop couplers. It operates within a 10000 to 12000 RPM variable speed range for adjustable material removal rates. The standard reach design fits typical grinding positions without excessive bulk. Pneumatic power eliminates electrical cords and reduces motor heat during extended use.
Suitability for Grinding Applications
This model suits technicians and fabricators needing a medium-duty pneumatic grinder for general metal preparation. Buyers requiring higher horsepower for heavy stock removal should evaluate more powerful alternatives. Users without an existing compressed air system will need to source a compatible compressor and hose. The tool is restricted from sale in California due to Proposition 65 chemical warnings.
Highlights
- 7 hp motor delivers strong grinding power
- 11,000 RPM maximum speed for fast material removal
- Type 27 wheel compatibility for versatile grinding tasks
- Safety throttle lever prevents accidental starts
- 1/4 in NPT female air inlet fits standard shop airlines
Specifications
| Brand | SPEEDAIRE |
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Questions about this item
At what sustained speed does the 0.7 hp motor reach its continuous limit?
The grinder operates between 10,000 and 12,000 RPM with variable speed control, allowing you to match the motor output to the workload without exceeding the 11,000 RPM maximum rating.
How much noise and heat does the safety throttle lever produce during all-day operation?
The safety throttle lever provides precise airflow control, letting you reduce motor speed to manage heat buildup and noise levels during extended medium-duty grinding sessions.
What air supply fittings must I already have to connect the 1/4 in NPT female inlet?
You need a compatible 1/4 in NPT male fitting on your air hose or regulator to match the grinder's female inlet, plus sufficient compressor capacity for the 0.7 hp motor.
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