Needle roller bearings use needle rollers as rolling
elements. The needle rollers are a maximum of 5 mm in
diameter and are 3 to 10 times as long as they are in
diameter. Because the bearings use needle rollers as
rolling elements, the cross-section is thin, but they have a
high load capacity for their size. Because of the large
number of rolling elements, the bearings have high rigidity
and are ideally suited to wobbling or pivoting motion.
There is a profusion of types of needle roller bearings,
and just a few of the most representative types are
covered here. For details, see the catalog devoted to the
concerned type of bearing.