1. Product Overview 30313JR is single row metric separable tapered roller bearing, overall dimension 65×140×36mm. JR logarithmic crowned roller structure reduces edge stress and operating heat. Separable cone and cup design simplifies installation, inspection and parts replacement without disassembling the whole shaft. It withstands large combined radial load and one-way axial thrust load, commonly used on heavy truck wheel hubs, large tractor drive axles and construction