Cylindrical rollers and raceways are linear contact bearings with high load capacity, mainly bear radial load. The less friction between the rolling element and the ferrule is suitable for high-speed rotation,which can be divided into NU, NJ, NUP, N, NF and other single-row cylindrical roller bearings, and NNU, NN and other double-row cylindrical roller bearings according to the presence or absence of ribs. The bearing has a separable inner and outer ring structure.
Cylindrical roller bearings without ribs on the inner and outer ring that can move relative motion itself, so they can be used as free-end bearings. Cylindrical roller bearings with doubl ribs on one side of the inner ring and outer ring and a single rib on the other side of the ring can withstand a certain degree of axial load in one direction. Generally, a steel stamping cage or a copper alloy solid cage is used. But some also use polyamide shaped cages.