Cylindrical Roller Bearings SKF NU208 ECP/C3

The SKF NU208 ECP/C3 cylindrical roller bearing, with a 40 mm bore and increased C3 clearance, provides targeted clearance for high radial loads.

The NU208 ECP/C3 cylindrical roller bearing is a single-row radial roller bearing with an optimised internal design for demanding industrial applications. In this design, the outer ring guides the rollers via two fixed flanges, whilst the flangeless inner ring remains removable from both sides. As a result, the open roller bearing primarily serves as a floating bearing, which freely compensates for thermally induced length changes in the shaft within the bearing. With key dimensions of a 40 mm bore, 80 mm outer diameter and 18 mm width, the design is specifically suited to high radial loads.

What loads can the NU208 ECP/C3 cylindrical roller bearing accommodate?

The design accommodates high radial loads whilst simultaneously allowing unimpeded axial compensation between the shaft and housing. As the inner ring has no flanges, no harmful axial forces arise in the rolling element area when the shaft undergoes length changes. The bearing is suitable for mounting positions designed exclusively for radial guidance. The open design requires the housing to be sealed on site, as well as an external supply of grease or lubricating oil.

What are the benefits of the polyamide cage and the C3 clearance?

The polyamide cage (designation ECP) reduces the bearing weight and inertial forces, and operates with low vibration even at varying speeds. At the same time, the slightly increased C3 radial clearance provides the bearing with additional space for thermal expansion during operation, which prevents seizing at operating temperatures ranging from –30 to +120 degrees. The tolerance classes are also relevant during design: dimensional accuracy complies with P0/PN or ABEC 1, whilst running accuracy is manufactured to P6 or ABEC 3.