Most needle roller bearings lack an inner ring and use the shaft as raceway surface. However, there may be cases where the shaft surface cannot be changed on the machine to the required hardness and/or roughness so in this case an inner ring may be used. NTN inner rings are made of high carbon chromium bearing steel blank that is heat-treated, and then fInish-ground to higher precision.

• Can also be used as a bushing.
• Available in both metric and inch series.
• Lubrication hole type at the raceway center is also available.