Impact Wrench Power Source Air Powered Air Consumption 22 cfm Air Inlet 1/4 in NPT Air Pressure 90 psi Max Air Pressure 100 psi Min Air Pressure 90 psi Min Hose Size 3/8 in Exhaust Location Bottom Duty Rating General Duty Breakaway Torque 590 ft-lb Fastening Torque 425 ft-lb Free Speed 8 000 RPM Impact Rated Yes Impact Sound Level 94 dB Impacts per Minute 1 150 Number of Speed Settings 6 Power to Weight Ratio 101.7 ft-lb/lb Max Bolt Capacity 1/2 in Drive Size 1/2 in Square