SPEEDAIRE
SPEEDAIRE 21AA84 Reversible Die Grinder 0.7 hp 18000 RPM
A reversible die grinder delivering 0.7 hp at 18000 RPM for heavy-duty grinding on ceramic, steel and wood
- Reversible rotation suits varied grinding tasks
- 7 hp motor delivers 18000 RPM for fast material removal
- 1/4 in NPT female inlet fits standard air lines
- Safety throttle lever with lock-off prevents accidental start
- Heavy-duty build handles ceramic steel and wood applications
SPEEDAIRE 21AA84 Reversible Die Grinder
This pneumatic die grinder delivers 0.7 hp and a maximum speed of 18000 RPM for heavy-duty material removal. The straight barrel grip and safety throttle lever provide controlled handling during grinding, deburring and polishing tasks. It accepts 1/4 inch collets and connects via a 1/4 inch NPT female air inlet. The tool is suited for professional workshops processing ceramic, steel and wood.
Upgrading from lower-torque air tools
Operators moving up from lower-horsepower grinders gain faster stock removal on hard materials without changing air supply infrastructure. The reversible function adds versatility for directional cutting or clearing debris in tight spaces. The jump is worthwhile when existing tools stall under load or lack the speed for fine finishing work. Two spanner wrenches are included for quick collet changes.
Sustained-load behaviour
The safety throttle lever prevents accidental start-up during prolonged use, reducing operator fatigue. Heavy-duty construction maintains consistent torque at the rated 18000 RPM when supplied with adequate compressed air flow. Barrel grip design dissipates vibration during extended grinding sessions on steel or ceramic. No case is included, so the tool stays at the workstation for continuous duty cycles.
Highlights
- Reversible rotation suits varied grinding tasks
- 7 hp motor delivers 18000 RPM for fast material removal
- 1/4 in NPT female inlet fits standard air lines
- Safety throttle lever with lock-off prevents accidental start
- Heavy-duty build handles ceramic steel and wood applications
Specifications
| Brand | SPEEDAIRE |
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Questions about this item
What size air hose fitting does the 1/4 in NPT female inlet accept?
Connect a 1/4 in NPT male fitting directly to the inlet; no adapter is required for standard shop air lines.
How do I reverse the rotation on this 0.7 hp die grinder?
Use the supplied spanner wrenches to reposition the internal valve plate — skipping this step leaves the tool running in one direction only.
Which consumables will need replacement on the 18000 RPM straight grinder?
The 1/4 in collet, collet nut and throttle lever spring are the primary wear items; inspect them during routine lubrication.
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