Cylindrical Roller Bearings SKF NU320 ECM/C3

SKF NU320 ECM/C3 cylindrical roller bearing with a 100 mm bore, 215 mm outer diameter and a brass cage, designed for demanding radial loads.

The NU320 ECM/C3 cylindrical roller bearing is a single-row radial roller bearing with an optimised internal design. As an open idler bearing, the design accommodates radial forces only. Thanks to the line contact of the cylindrical rollers, this design offers high rigidity and load-carrying capacity compared to ball bearings subjected to point loads. The solid brass cage guides the rollers with dimensional stability even at high speeds and under varying dynamic loads.

For which bearing applications is the NU320 ECM/C3 cylindrical roller bearing used?

This non-locating bearing is suitable for shaft mountings where thermally induced changes in shaft length must be compensated for without constraint. As the inner ring can be removed from both ends, the assembly can be moved axially without causing axial constraint stresses in the bearing seat. It is primarily used in bearing arrangements that accommodate high radial loads and require precise cylindrical guidance without an axial retaining function.

What is the function of the NU design and the C3 clearance?

The NU design features two fixed flanges on the outer ring, whilst the inner ring is manufactured without flanges. This allows both bearing rings to be fitted separately, which simplifies handling during installation and inspection. The increased radial clearance (C3) compensates for thermal expansion at operating temperatures ranging from -30 to +150 degrees. The necessary operating clearance is maintained even with tight fits on the shaft and housing.