Impact Wrench Power Source Air Powered Air Consumption 15 cfm Air Inlet 1/4 in NPT Air Pressure 90 psi Max Air Pressure 90 psi Min Air Pressure 90 psi Min Hose Size 3/8 in Exhaust Location Bottom Duty Rating General Duty Breakaway Torque 425 ft-lb Fastening Torque 310 ft-lb Free Speed 8 400 RPM Impact Rated Yes Impact Sound Level 104 dB Impacts per Minute 1 020 Number of Speed Settings 4 Power to Weight Ratio 82.8 ft-lb/lb Max Bolt Capacity 1/2 in Drive Size 1/2 in Square