Structural features RSTO bearing code no outer wall, the cage, curved rolling surface RSTO..X unsealed, without inner cylindrical roller surface STO outer wall, the cage, curved rolling surface STO. .X double sealed, no inner cylindrical roller outer surface RNA22..2RS double-wall, there cage, curved rolling surface RNA22..2RS X double sealed, cylindrical inner ring rolling surface NA22 .. 2RS outer double-wall, there is a curved roll cage face NA22..2RS X double sealed, cylindrical inner ring rolling surface. NATV and NATV ... PP-type roller bearing NATV series roller bearing roller bearing with NATR series NATRD20 basically the same needle roller bearings, the only difference is NATV series full complement needle roller type. So it can withstand heavy loads at low speeds, but must pay attention to regular lubrication. NATV ... PP series with a sealed structure. NATRD30 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) Shandong Liaocheng, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Needle in governance and leadership with the staff warmly welcome all inquiries negotiations to create a better future governance and needle.