These single or double row units comprise machined outer rings without ribs, needle roller and cage assemblies and removable inner rings. Since the bearings are not self-retaining, the outer ring, needle roller and cage assembly and inner ring can be fitted independently of each other.

Needle roller bearings without ribs are X-life bearings. In this design, the raceway surfaces are optimised. 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 needle roller and cage assembly can be fitted either together with the outer ring or with the shaft. It can also be subsequently slid between the outer ring and shaft.

Bearings with an inner ring are used if the shaft is not configured as a rolling bearing raceway.

The needle roller and cage assembly can be fitted either together with the outer ring or with the inner ring. It can also be subsequently slid between the outer ring and inner ring.

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.

Needle roller bearings without ribs are not sealed.

Open needle roller bearings without ribs can be lubricated with grease or oil. Double row bearings can be lubricated via a lubrication groove and lubrication hole in the outer ring and have the suffix ZW-ASR1.

Bearings with a lubrication hole in the inner ring have the suffix IS1.

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.

Sealing rings must not be used as running surfaces for the cage.

Bearings with plastic cage can be used at operating temperatures from –20 °C to +120 °C.

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.