features needle roller and cage components are single or double row bearing units composed of cage and needle roller. Single column design conforms to DIN 5405-1 . because its radial section is the same as the diameter of the needle, the needle and cage components can be applied to very small internal space of the shaft and bearing pedestal. This kind of bearing has high bearing capacity, is suitable for high speed and is easy to install. if the raceway has high machining accuracy, the bearing can obtain corresponding high running accuracy. the internal radial clearance is affected by the needle group and the tolerance of shaft and bearing seat. needle roller and cage components are required to be hardened and ground on the surface of shaft and bearing seat as raceway. only double row needle roller and cage components with special envelope circle diameter F W . is represented by suffix ZW . provide needle roller and cage components according to the standard needle roller groups in the table below. each needle and cage component contains only one group of needles. The packaging is printed with group and color code of representative group, please refer to the following table. = 'EN-US ' > m , see the table below. For each case, two adjacent needle groups are matched.

group corresponding to	needle group
color code	& mu; m
Red	0-2 / - 1-3
Blue	- 2-4 / - 3-5
White (gray)	- 4-6 / - 5-7

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