Air Motor, Output Power @ Maximum Speed 4 hp, Maximum Torque 84 in-lb, No Load Speed 3,000 RPM, Maximum Flow Rate 128 cfm, Shaft Diameter 5/8 in, Shaft Length 1 3/8 in, Mount Type Foot, Inlet Size 1/2 in, Air Inlet Type NPT, Rotation CW/CCW, Housing Material Aluminum, Cast Iron, Shaft Material Grade 40Cr, Bearing Protection Not Applicable, Maximum Operating Pressure 100 psi, Includes Muffler, Keyway Width Not Applicable, Weight 16.98 lb, Housing Material Grade Not Applicable WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -