Needle roller bearings with ribs are single or double row units comprising machined outer rings with ribs, needle roller and cage assemblies and removable inner rings. Needle roller bearings with ribs are X-life bearings. These bearings have optimised raceway surfaces. This gives higher load carrying capacity and longer rating life. Needle roller bearings without inner ring: Bearings without inner ring have particularly compact radial dimensions. However, they require a shaft raceway that is hardened and ground. The bearings are of a single row design, RNA69 is of a double row design from Few ≧ 40 mm. Needle roller bearings with inner ring: Bearings with an inner ring are used if the shaft is not configured as a rolling bearing raceway. The bearings are of a single row design, NA69 is of a double row design from d ≧ 32 mm.
