Needle roller and cage units are single or double row bearing. It include the cages and the special needle rollers.
Needle roller bearings are roller bearings with rollers which are small across. Despite their low cross section, the bearings take a great load carrying capacity , so extremely fit to bearing arrangements where radial space is fixed.
Since their radial section is no over the diameter in a needle rollers.They high load carrying ablity, are proper for high speeds and can easily be fitted. The roller and cage units allow bearing measures with a very small radial design envelope to get obtained.