Air Motor, 4 hp HP, Running Torque @ Max. Pressure 84.0 in-lb, 128 cfm Max. Air Flow, No Load RPM 3,000 RPM, Shaft Dia. 5/8 in, Shaft Length 1.95 in, Flange Mounting, Port Size 1/2 in NPT, REV Rotation, Housing Material Cast Iron and Aluminum, Gray Finish, 250 RPM @ Max. Torque, Max. Air Pressure 100 psi, Overall Length 8.13 in, Overall Width 6.5 in, Overall Height 6.5 in, 0 Degrees to 250 Degrees F Operating Temp. Range, Includes Muffler