The BCHP18 is a press-fit type spring-loaded ball roller (or ball transfer unit) featuring a 18 mm body diameter, an 8.73 mm main ball diameter, and a 55 N (5.6 kgf) allowable load capacity. Model BCHP18 Brand ZH Material Chrome Steel precision P0 P6 P5 P4 Product Description The BCHP18 is not a traditional transmission rolling bearing (such as a deep groove ball bearing); it is a press-fit spring plunger type ball roller. It is typically used in lightly loaded components