SPEEDAIRE
SPEEDAIRE 21AA92 Pencil Grinder 0.1 hp 56000 RPM
A 0.1 hp pencil grinder reaching 56,000 RPM with a 1/8 in collet and 1/4 in NPT female air inlet
- Lightweight 0.1 hp motor reaches 56000 RPM for fine detail work
- Rear exhaust directs air away from the workpiece for cleaner results
- Lock-off and lock-on switches give secure speed control during use
- 1/4 in NPT female inlet connects directly to standard shop air lines
- Low 2.4 m/sq sec vibration reduces operator fatigue over long sessions
SPEEDAIRE 21AA92 Pencil Grinder
The SPEEDAIRE 21AA92 is a medium-duty pneumatic pencil grinder built for precision deburring and finishing tasks. It operates at a maximum speed of 56,000 RPM with a 0.1 hp motor and accepts a 1/8 in collet. The tool includes a lock-off and lock-on switch for controlled operation and anti-restart technology. It connects via a 1/4 in NPT female air inlet and comes as a bare tool with a whip hose.
Air Supply and Interface Constraints
This grinder requires a compressed air source delivering sufficient flow at the 1/4 in NPT female inlet. The 5.5 mm internal diameter whip hose limits the maximum practical air volume compared to larger supply lines. Performance will drop if the supply pressure or volume falls below the tool's demand at 56,000 RPM. The rear exhaust directs air away from the workpiece but adds length to the tool body in tight spaces.
Vibration and Duty Cycle Limit
The declared vibration level of 2.4 m/s² is the critical figure for assessing operator exposure during extended use. This value determines how long the grinder can be operated safely before vibration limits are reached. The absence of a brake, anti-kickback clutch, or dust management means the tool is unsuitable for applications requiring rapid stop times or integrated debris extraction. Buyers needing lower vibration or automatic braking should select a different model.
Highlights
- Lightweight 0.1 hp motor reaches 56000 RPM for fine detail work
- Rear exhaust directs air away from the workpiece for cleaner results
- Lock-off and lock-on switches give secure speed control during use
- 1/4 in NPT female inlet connects directly to standard shop air lines
- Low 2.4 m/sq sec vibration reduces operator fatigue over long sessions
Specifications
| Brand | SPEEDAIRE |
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Questions about this item
Which collet size should I select for the 21AA92 pencil grinder?
The tool comes with a 1/8 in collet as standard, so no alternative size needs to be chosen for this model.
What does the 56000 RPM rating mean when the grinder is running under load?
56000 RPM is the maximum free speed; actual speed will drop once material resistance is applied during grinding.
How does the 1/4 in NPT female air inlet limit airflow in practice?
The 1/4 in NPT female inlet and 5.5 mm whip hose together restrict flow to what the fitting and hose can deliver at shop pressure.
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