Needle roller bearings with supplementary lubrication of the inner ring are available separately. They are usually used in combination with needle roller and cage assemblies or drawn cup needle roller bearings in applications where the shaft surface cannot be hardened or ground. The inner ring of the IR series is the standard inner ring on JOJI needle roller bearings. The inner ring contains a lubrication hole for additional lubrication.

• Complete interchangeability of inner rings
• Standard JOJI inner rings used in needle roller bearings
• Can withstand bi-directional axial displacement
• Supplementary lubrication is possible via the inner ring