The SP-45 typically refers to a heavy-duty ball transfer unit. It features a 45mm main load-bearing ball designed for omni-directional material handling, conveyor systems, and industrial machinery, offering a load capacity typically ranging from 450kg to 500kg. Model SP-45 Brand ZH Material Chrome Steel precision P0 P6 P5 P4 Product Description The SP-45 bearing typically refers to a heavy-duty omnidirectional ball transfer unit (ball caster), commonly used in logistics