. NA, NKI.NKIS.NK.NKS.RAN.NAV.RNAV physical ring governance and needle roller bearings, these bearings can be used for: drying machine, a plastic machine, cross-flow cooling tower, shoe repair machines, pneumatic chuck, Roland printing presses, medical needle roller bearings, beverage production equipment, mixing heat exchanger, engraving machine, re-election equipment, drying curing equipment, desulfurization machine, presses auxiliary, marking vehicle, high-pressure pump, mesh belt furnace, line cutting, and so on purpose. . Identified by voice, it requires experience. We must be able to identify adequate training to achieve sound bearing and non-bearing sounds. For this reason, because as far as possible by professional people to work on it. Attached to the bearing housing can clearly hear the sound by listening stick. This method belongs to the working temperature recognition by comparison, it is limited to little change in the operating state of the occasion. So HK121814 needle roller bearings, the temperature must be continuously recorded. When failure is not only the temperature will rise, there will be irregularities. The method and voice recognition method with appropriate. NA, NKI-type bearings without inner ring is RNA, NK-type needle bearings. Such bearings without inner ring for radial mounting dimensions restricted support structure to match the journal and the bearing directly as a rolling surface. As raceway axis, the hardware must be quenched and polished, but only when it is processed to the appropriate size and shape accuracy, the entire needle bearings to higher life and running accuracy. Also, because without inner diameter so that the shaft can also be made appropriate to increase, thus increasing the rigidity. NA Needle roller bearings HK121718 needle roller bearings, needle roller bearings, needle roller by LINQing municipal governance and needle roller bearings plant. Linqing municipal and needle roller bearings plant (www.zhgzzc.com) (www.zhgzzc.net) strong, credible, in other industries, Liaocheng accumulated a large number of loyal customers. The company better work attitude and constantly improve governance and innovative ideas will lead the needle into the brilliant and you work for a better future!