The needle roller bearing without inner ring is suitable for the parts of which the radial size is limited. Because of no inner ring , the surface of shaft journal fitted with it is acted directly as rolling surface. It is requested that the surface hardness be no less than HRC60, surface roughness, no more than 0.63μm. This kind of bearing does not limit the axial shift of shaft and housing and has high limiting rotational speed

Main structural forms: