Cylindrical Roller Bearings SKF NU2209 ECJ/C3

The SKF NU2209 ECJ/C3 cylindrical roller bearing, with its main dimensions of 45 × 85 × 23 mm, accommodates high radial loads as a separable idler bearing.

This single-row NU2209 ECJ/C3 cylindrical roller bearing from SKF is designed to provide precise guidance for rotating shafts under heavy radial loads. The optimised internal design, combined with a dimensionally stable sheet steel cage, guides the cylindrical rollers accurately through the outer ring. As an open bearing, this component is suitable for designs with an external lubrication system and operates across a wide temperature range from –30 to +150 degrees Celsius.

In which shaft arrangements is the NU2209 ECJ/C3 cylindrical roller bearing used?

Design engineers and maintenance personnel primarily use this bearing in industrial shaft mountings where only pure radial loads occur. As the inner ring has no flanges and is designed to be removable from both sides, the unit functions purely as a non-locating bearing. The component compensates for changes in shaft length caused by temperature differences axially, directly between the rollers and the flat inner ring raceway, with low friction.

What are the functions of the NU design and the C3 bearing clearance?

The NU design facilitates repair and assembly, as the outer ring with roller set and the inner ring can be press-fitted separately. The increased radial clearance C3 provides additional radial play within the bearing. This prevents the rolling elements from becoming jammed if tight shaft fits cause the inner ring to expand or if operational heating leads to thermal expansion. The dimensional accuracy corresponds to class P0/ABEC 1, whilst the running accuracy is specified to P6/ABEC 3.