Summary
The entity bushed needle roller bearing is a kind of high capacity bearing with small sectional height. Because of its highly hard outer ring, it can perform flexibly even with the light alloy bearing seat. There are two series of products: the metric and the inch series. Both of which have three structures of with-retainer, full needle and sealing types. Besides, the entity bushed needle roller bearings are divided into two kinds: that with inner ring and without inner ring .The center shaft is used as rolling body tray for those without inner ring, thus making the size smaller.

1.Inner ring
The inner ring of IR series is quenched and made with high precision. The dimensional tolerance and the geometric precision of the standard inner ring accord with PO grade. In using the needle roller bearings, the selection of inner ring will enable the bearing to keep a normal operational backlash windage.

2.Radical clearance and mounting
Standard clearance of needle roller bearings is CO grade. For special requirements, clearance of C2, C3, and C4 can also be supplied. When needle roller bearings are mounted in parallel, they should have the same radical clearances so that the load can be distributed evenly.
In general case, the mounting of the needle roller bearing needs compact combination so that the thin wall bush can be well supported. The heavier the load, the bigger the selection combination, especially the impact load exists. Besides, the combination of materials and temperature differences is also need to be considered.