Impact Wrench Power Source Air Powered Air Consumption 20 cfm Air Inlet 1/4 in NPT Female Air Pressure 90 psi Max Air Pressure 90 psi Min Air Pressure 50 psi Min Hose Size 3/8 in Exhaust Location Bottom Duty Rating General Duty Breakaway Torque 400 ft-lb Fastening Torque 400 ft-lb Free Speed 11 000 RPM Impact Rated Yes Impact Sound Level 93 dB Impacts per Minute 1 600 Number of Speed Settings 3 Max Bolt Capacity 3/8 in Drive Size 3/8 in Square Drive Type Standard