DF - IR inner ring (the ring) after heat treatment and precision machining, needle roller bearings NA4908, dimensional tolerances and geometrical precision in line with national standards, needle bearings, inner ring raceway surface is generally a guide chamfered ends so installation. It applies to the shaft can not be heat treated, not directly as a raceway occasions. The inner ring and without inner ring needle roller bearings with reach normal operating clearance when in use. Bearings for bearing stiffness has certain requirements; or with a standard inner ring IR were inlayed, the hardness of the shaft is not required, the structure will be more compact. According to the special structural requirements of the design. , Due to changes in the size structure of the material changes. This shift by temperature, time and stress influence. Needle roller bearings NKI40 / 30, governance and needle (online consultation), needle roller bearings supplied by Linqing municipal and needle roller bearings plant. Linqing municipal and needle roller bearings plant (www.zhgzzc.com) (www.zhgzzc.net) Shandong Liaocheng, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. Needle in governance and leadership with the staff warmly welcome all inquiries negotiations to create a better future governance and needle.