Close-Coupled Pump Motor 3-Phase 20 HP Nameplate RPM 1750 Voltage 575 3 Phase Frame 256JM Totally Enclosed Fan-Cooled Full Load Amps 20.4 60 Hz Rigid Base Mounting Thermal Protection None Insulation Class F Service Factor 1.15 Double-Shielded Ball Bearings Max Ambient Temp 40 Degrees C CW/CCW Rotation Overall Length 28-1/2 In. Shaft Dia 1-3/8 In. Shaft Length 5-1/4 In. Frame Material Aluminum