WE got this from a business closing sale. This was their ,very low use, back-up motor for at least one of their pieces of equipment. It runs and sounds perfect. Our in-house Electrical Tech wired it for 230 volt 3 Phase and ran it with a load for 25 minutes. It ran quiet and cool. The shaft is 5/8" diameter with 2 flat sides and a keyway. It weighs 28 Lbs. so shipping is expensive, so please make sure this is correct for you. We do accept returns, but buyer is responsible for shipping.