The SP-15 is a common, multi-directional ball transfer unit. It features a 5/8-inch (15.875 mm) main steel or nylon ball housed inside a flange, capable of 360-degree rotation. These are used in manual conveying systems, assembly lines, and luggage handling. Model SP-15 Brand ZH Material Chrome Steel precision P0 P6 P5 P4 Product Description The SP-15 bearing typically refers to the SP-15 ball transfer unit—widely used in industry and often known as a "transfer ball" or "omni