Cylindrical rollers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ring is small, which is suitable for high-speed rotation. According to whether the ring has ribs or not, it can be divided into single row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double row cylindrical roller bearings such as NNU and NN. The bearing is a structure in which the inner ring and the outer ring can be separated. Cylindrical roller bearings without ribs on the inner or outer ring, the inner and outer rings can move relative to the axial direction, so they can be used as free end bearings. Cylindrical roller bearings with double 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 is used, or a copper alloy turning solid cage is used. However, there are also part of the use of polyamide forming cage.Large and medium-sized electric motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and hoisting and transporting machinery, etc.1. Type N0000 without ribs on the outer ring and type NU0000 without ribs on the inner ring. Cylindrical roller bearings can accept large radial loads, have a high limit speed, do not bind the axial displacement of the shaft or housing, and cannot accept axial load. 2. Cylindrical roller bearings NJ0000 and NF0000 with ribs on both the inner and outer rings can restrain the axial displacement of the shaft or housing in one direction, and can accept a small one-way axial load. NU0000+HJ0000, NJ0000+HJ0000, and NUP0000 bearings can restrain the axial displacement of the shaft or housing in two directions within the axial clearance area of the imported bearing, and can accept small bidirectional axial loads.