Air Motor 4 HP Running Torque @ Max Pressure 84.00 in.-lb. 128 cfm Max Air Flow No Load RPM 3000 Shaft Dia 5/8 In. Shaft Length 2.06 In. Flange Mounting Port Size 1/2 in NPT REV Rotation Housing Material Cast Iron and Aluminum Blue Finish Stall Torque 80 in.-lb. 250 RPM @ Max Torque Max Air Pressure 100 psi Keyway Length 0.19 In. Overall Length 8.29 In. Overall Width 6.50 In. Overall Height 6.50 In. 0 Degrees to 250 Degrees F Operating Temp Range Includes Muffler