Machined-Ring Needle Roller Bearing w/o Inner Ring-RNA49.R, RNA59, RNA69.R, NK.R, MR Series

The RNA6903R is a machined-ring needle roller bearing designed to operate without an inner ring. The bearing uses the shaft itself as the inner raceway, requiring a hardened and ground shaft surface for proper operation.

Needle roller bearings without inner rings are commonly used in applications where space is limited and high radial load capacity is required, such as connecting rods, rocker arms, and transmissions. The compact design maximizes load capacity while minimizing radial space requirements.