| Specification Attribute | Technical Detail |
| Brand | AEROPRO |
| Model Number | A398 |
| Product Type | Heavy-Duty Pneumatic Air Impact Wrench |
| Drive Size / Anvil | 1/2" (12.7 mm) Ultra-High Alloy Steel |
| Impact Clutch Mechanism | Twin Hammer (45 mm Cylinder Design) |
| Maximum Loosening Torque | 1,220 ft-lb (~1,654 N·m) |
| Working Torque | 850 ft-lb (~1,152 N·m) |
| Speed / Torque Settings | 3-Speed Forward Adjustment / Full Reverse |
| Head / Drive Style | Hex Drive Socket Retention (Friction Ring / Detent) |
| Overall Tool Length | 6.0 Inches (~152 mm) |
| Net Tool Weight | ~4.6 to 5.3 lbs (~2.1 to 2.4 kg) |
| Housing Material | High-Impact Composite Thermoplastic with Rubberized Grip |
| Exhaust Location | Downward Handle / Rear Exhaust Port |
| Target Applications | Tire Centers, Brake & Suspension Shops, Light-to-Medium Fleet Service & Industrial Assembly |
| Best Used For | Fast High-Torque Removal and Seating of Stubborn Lug Nuts and Undercarriage Hardware |
Massive 1,220 ft-lb Loosening Torque: Engineered with a 45mm motor cylinder and a heavy-duty twin hammer clutch, delivering 850 ft-lb working torque and 1,220 ft-lb breakaway power for frozen bolts.
Compact 6-Inch Low-Profile Frame: Short head-to-back design slips effortlessly into tight wheel wells, engine bays, and automotive undercarriage cavities.
Lightweight Composite Body with Rubber Grip: Durable plastic composite shell minimizes arm strain, while the contoured semi-wrapped rubber handle absorbs vibration and enhances grip stability.
3-Speed Forward & Full-Power Reverse: Features a smooth forward power management dial (ideal for preloading fasteners) alongside an uninhibited full-power reverse for instant breakaway.
Clean-Workspace Rear Exhaust & Orbital Trigger: Directs discharged compressor air and line oil away from operator and workpiece, paired with an easy-to-feather orbital actuation trigger.