Cylindrical Roller Bearings SKF NU2209 ECP/C3

The SKF NU2209 ECP/C3 cylindrical roller bearing, designed as a non-locating bearing with a 45 mm bore, can accommodate high radial loads.

The NU2209 ECP/C3 cylindrical roller bearing is a single-row radial roller bearing from SKF with an optimised internal design. Thanks to the line contact between the cylindrical rollers and the raceways, this design can handle high radial loads whilst maintaining good rigidity. The NU design features two fixed flanges on the outer ring, whilst the flangeless inner ring remains removable from both sides. With compact key dimensions of a 45 mm bore, 85 mm outer diameter and 23 mm width, this open bearing is suitable for designs with separate lubrication.

What is the NU2209 ECP/C3 cylindrical roller bearing suitable for in operation?

In rotating machinery, this design is primarily used as a conventional idler bearing. As the inner ring has no flanges, the bearing compensates for axial length changes of the shaft relative to the housing with low friction directly inside the bearing. The integrated polyamide cage guides the rollers quietly and is suitable for operating temperatures ranging from –30 to +120 degrees. The design is intended for bearing locations where purely radial loads occur and axial guidance is provided by a separate fixed bearing.

When is the increased bearing clearance C3 appropriate in the design?

The designation C3 indicates a slightly increased radial clearance compared with the standard version. This increased internal clearance counteracts stress on the rolling elements when temperature differences arise between the inner and outer rings during operation, or when tight fits on the shaft and housing reduce the bearing clearance after installation. In conjunction with dimensional accuracy to tolerance class P0 (ABEC 1) and improved running accuracy to P6 (ABEC 3), the rolling bearing ensures smooth running characteristics even under demanding thermal conditions.