NA, NKI-bearing without inner ring is the RNA, NK-type needle roller bearings. Such bearings without inner ring needle roller bearings for radial mounting dimensions restricted support structure to match the journal and the bearing directly as rolling surface. As raceway shaft, the hardware must be quenched and polished way needle bearing, and only when it is processed to the appropriate size and shape accuracy, the entire needle roller bearings to a higher life expectancy and running accuracy. Meanwhile, since Needle roller bearings without inner diameter of the shaft therefore also be used as appropriate to increase, thus increasing the rigidity. NA Needle roller bearings mounted on the shaft of the Needle roller bearings have bilateral and unilateral closed open. Drawn cup closed proximal end surface can withstand the axial guiding force. Needle roller bearings are generally not attached to the inner ring. In the journal of the occasion can not be hardened and ground, you can use the inner listed in the table. Needle roller bearings in hardened steel outer ring and needle roller cage assemblies can not be separated. Free space to store lubricants can extend relubrication intervals. Taian needle roller bearings _ _ Needle roller bearings Figure governance provided by the governance needle. Linqing municipal and needle roller bearings plant (www.zhgzzc.com) class in physical ring needle roller bearings, bearing roller type needle roller bearings, curve roller type needle roller bearings, and other industries have high visibility, integrity management, quality both services, please contact us or consult our "Commercial Union Service" it!