The Grainger 16N591 is a 1/2 HP, 115V, 1725 RPM, 56C Frame, Open Drip Proof, Single Phase, Ball Bearing, Electric Motor. It has a NEMA standard 56C frame with a 1/2" diameter shaft and 1-1/4" long. The motor is totally enclosed, fan cooled with a Class B insulation and operates on single phase 115V power. This electric motor can be used for various light industrial applications requiring 1/2 HP.