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.

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 F_w ≧ 40 mm.

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.

The standard inner ring allows axial displacement within the values “s” stated in the dimension tables. Where larger displacements occur, the standard ring can be replaced by a wider inner ring IR. Inner rings: see pages starting link.

Series RNA49..-RSR and NA49..-RSR are sealed on one side. The designs RNA49..-2RSR and NA49..-2RSR have contact seals on both sides.

The bearings are greased using the lithium complex soap grease GA08. Arcanol LOAD150 is suitable for relubrication. For this purpose, the outer ring has a lubrication groove and a lubrication hole.

There is no relubrication facility in series NK with F_w ≦ 10 mm and NKI with d ≦ 7 mm.

The bearings can be sealed against external influences using sealing rings of series G, GR and SD in combination with wider inner rings IR. The sealing rings and inner rings are matched to the needle roller bearings.

The outer surface of the inner rings can be used as the sliding surface for seal lips.

Sealing rings: see link, and TPI 128, Sealing rings, single lip and double lip.

Open bearings can be used at operating temperatures from –20 °C to +120 °C.

Sealed needle roller bearings are suitable for operating temperatures from –20 °C to +100 °C, restricted by the grease and seal material.

The cages are made from sheet steel or plastic. Bearings with a plastic cage have the suffix TV.

Before using bearings with plastic cages, the compatibility of the lubricant used with the cage material (PA66-GF/H) must be checked.

Suffixes for available designs: see table.