Press bearings are used in the main cylinders of sheet-fed and web-fed presses. Due to the complexity of application requirements, only a small fraction of printed machinery bearings can be standardized. Therefore, there are many types and sizes of printing press bearings.

 In addition to the typical multi-row, high-precision cylindrical roller bearings NN, NNU, N4N, N4U, it also includes floating bearing units with or without eccentric rings, locating bearing units, polygon bearings, combined linear and rotary bearing units and tapered roller bearing units Sub bearing unit. There are two types of bearings, sealed and unsealed. The journals at both ends of the drum can be cylindrical or conical in design.