3.7HP Air Compressor Motor: 3.7HP 3450 RPM, Single Phase, Full Load Amps: 17.2A, 230V, 2 Pole. Frame Type: 56 Frame, 5/8" Keyed shaft, Shaft length-1.88". Open Drip-proof: Suggest using in clean and dry environments. Made of high-quality steel material, it can protect the engine, longer service life. Dual Rotation Direction: Motor is Reversible for CW/CCW, provides easier wiring operations. Safe & Durable: Tested with CSA certification. A rolled steel shell, fast heat dissipation and compatible keyed shaft for longtime usage.