2 HP SPL 3450 RPM M56 Frame 115/230V Air Compressor Motor - Century # B381 2 HP SPL 3450 RPM, 15.0/7.5 amps, 115/230V 60hz. Open Drip Proof - Ball Bearings - Service Factor 1.0 Non-Reversible - CCW Rotation facing the shaft M56 Frame; NEMA 56 Frame - Flat Rigid base mount Shaft: 5/8" diameter x 1 7/8"