NA, NKI-bearing without inner ring is the RNA, NK-type needle roller bearings. Such bearings without inner ring 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, and only when it is processed to the appropriate size and shape accuracy NKIS7 needle roller bearings, needle roller bearings to the whole life and high running accuracy. Also, because without inner NKI07 / 16 needle roller bearings, shaft diameter and therefore may be suitably increased, thus increasing the rigidity. NA Needle roller bearings are identified by voice, you need to experience. Must be able to identify adequate training to achieve the sound bearing and non-bearing sound. To this end needle bearing, because as far as possible by a professional person to carry out this work. Attached to the bearing shell can clearly hear the sound by listening stick. The method belongs to the working temperature recognition by comparison, is limited to little change in operating state occasions. So NKI05 / 12 needle roller bearings, must be continuously recorded temperatures. When a fault occurs, the temperature will not only rise, there will be irregular changes. The voice recognition method and the method is preferably used. NKIS6 needle roller bearings, needle roller governance (Certified), needle roller bearings supplied by LINQing municipal and needle roller bearings plant. Linqing municipal and needle roller bearings plant (www.zhgzzc.com) in this area other devoted boundless enthusiasm and passion, governance and the needle has been customer-centric, the concept of creating value for customers, quality, service to win market, and sincerely hope to cooperate with the community to create a successful, create brilliant. Related businesses welcomed the inquiry, contact: Mr.Song.