Needle roller bearing is a type of roller bearing, although sometimes the roller size slightly exceeds the needle roller size range defined by JIS, it is still commonly referred to as needle roller bearing.
Needle roller bearings can be divided into radial bearings and thrust bearings according to the direction of the load they bear. Among them, radial bearings include various series of stamped outer ring type, solid type, as well as special purpose bolt type and gear ring type roller needle bearings.