Cylindrical Roller Bearings SKF NU319 ECM/C3

The NU319 ECM/C3 cylindrical roller bearing from SKF Rolling Bearings is a single-row idler bearing with a 95 mm bore that offers high radial load-carrying capacity under thermal stress.

This open cylindrical roller bearing of the NU design, acting purely as a non-locating bearing, accommodates radial loads. Both flanges are located on the outer ring, whilst the inner ring is flangeless. This allows the inner ring to be removed from both sides, facilitating the separate assembly of the shaft and housing. With key dimensions of a 95 mm bore, 200 mm outer diameter and 45 mm width, this version features an optimised internal design and a solid brass cage.

In which installation scenarios does the NU319 ECM/C3 cylindrical roller bearing compensate for axial length changes?

The design is primarily suitable for bearing arrangements where purely radial loads occur and temperature-induced changes in shaft length need to be compensated for. As the inner ring can move freely axially relative to the roller set, thermal expansion can be accommodated without internal stresses. The permissible temperature range is from –30 to +150 degrees Celsius.

What is the function of the brass cage and the C3 radial clearance in this cylindrical roller bearing?

The combination of a brass cage and a slightly increased radial clearance (C3) is designed for demanding thermal and dynamic operating conditions. The brass cage guides the cylindrical rollers and is suitable for high accelerations or vibration loads. The increased C3 radial clearance helps to prevent the rolling elements from jamming when temperature differences occur between the inner and outer rings or when tight fits reduce the radial clearance.