The NKIB Series refers to a specific type of Needle Roller Bearing that comes with an integral inner ring. The "IB" in the model designation explicitly stands for "Inner Ring". This design features a precision inner ring that is integral to the bearing assembly, which runs in conjunction with a full complement of needle rollers and often a cage, all contained within a thin, hardened outer ring.
The key advantage of the NKIB design is that it simplifies installation and protects the shaft, as the hardened inner ring serves as the raceway instead of the shaft itself. This eliminates the need for the mounting shaft to be hardened and ground to the same precise tolerance, reducing overall cost and complexity. It offers a good balance between the compactness of a needle roller bearing and the convenience of a ready-to-mount unit with a dedicated raceway.
| Inquiry | Bearing Number | Principal dimensions （mm) | Weight(Kg) | ||
|---|---|---|---|---|---|
| d | D | B | |||
| NKIB 5901 | 12 | 28 | 10 | 12 | |
| NKIB 5902 | 15 | 32 | 10 | 15 | |
| NKIB 5903 | 17 | 35 | 12 | 20 | |
| NKIB 5904 | 20 | 42 | 12 | 25 | |
| NKIB 5905 | 25 | 47 | 12 | 30 | |
| NKIB 5906 | 30 | 55 | 15 | 40 | |
| NKIB 5907 | 35 | 62 | 15 | 45 | |
| NKIB 5908 | 40 | 68 | 18 | 55 | |
| NKIB 5909 | 45 | 75 | 18 | 65 | |
| NKIB 5910 | 50 | 80 | 20 | 75 | |
| NKIB 5911 | 55 | 87 | 20 | 85 | |
| NKIB 5912 | 60 | 92 | 22 | 95 | |
