Cylindrical roller bearings

Cylindrical roller bearings have line contact between rollers and raceways, and therefore combine high radial load capacity with rigidity. Depending on the series, one of the rings can be separated from the rest, which allows each ring to be mounted with a tight fit and simplifies assembly and disassembly. They are used in gearboxes, electric motors, pumps, fans and machine tools.

The initial letter of the designation indicates where the ribs are. N and NU allow only radial load and let the shaft move axially relative to the housing; NJ guides the shaft in one direction and NUP fixes it in both. In NU209 and NU2209 the number combines dimension series and size: from 04, the last two digits multiplied by 5 give the bore diameter in millimeters (NU209: 45 mm). Suffixes in codes such as N 203 ECP, NU209EA, NU2207ET or NU1007(M) indicate internal design or cage variants, and are not interchangeable: the code is quoted complete.

To choose, first define the radial load and speed, and then how the shaft is supported. In an arrangement with one fixed and one floating support, the fixed position takes NJ or NUP and the floating one an NU or N series, which absorbs thermal expansion. These bearings tolerate little misalignment, so it is advisable to check shaft and housing coaxiality, and consult the radial internal clearance (for example C3) when there is temperature difference between rings.

In this subcategory we work with SKF, NTN, FAG, NSK and Link-Belt, with executions such as LSL192316 from FAG or Link-Belt series (series 1000, series 1200). Send us via WhatsApp the complete code or the bore, outside diameter and width measurements, and the brand you currently use: we will quote and indicate the cross-reference between brands.