One way bearing is a kind of bearing which could turns freely in one direction and lock dead in another direction. It is also called one way clutch. It adopts GCr15 bearing steel as raw material and the hardness could be HRC61-65 after heat treatment. The bearing has small measurement, high load capacity and enough space to store lubricating grease. The application of such bearings is wide. They are widely used in textile machinery, printing machinery, auto industry, home appliances, currency detector etc.