Needle roller bearing is a kind of roller bearing. Although sometimes
the roller size slightly exceeds the range of needle roller size defined
by JIS, it is still commonly called needle roller bearing.
Needle roller bearings can be divided into centripetal bearings and
thrust bearings according to the direction of load bearing. Among them,
the centripetal bearing includes: various series of stamping outer ring
type, solid type, as well as special purpose bolt type and gear ring
type roller needle bearing