NKI Needle Roller Bearings — Sizes & Specifications
The NKI series is the NK machined-ring needle roller bearing complete with an inner ring, so it mounts on a standard shaft without a hardened raceway finish. The model encodes bore (Fw) and width, for example NKI20/16. Typical uses are gearboxes, pumps and agricultural machinery. BPK supplies the NKI range listed here, factory-direct from Yandian, Shandong, for importers, distributors and OEM buyers.
Standard sizes
| Model | Bore Fw (mm) | |
|---|---|---|
| NKI6/10 | 6 | Inquiry |
| NKI8/12 | 8 | Inquiry |
| NKI10/12 | 10 | Inquiry |
| NKI12/12 | 12 | Inquiry |
| NKI14/16 | 14 | Inquiry |
| NKI16/16 | 16 | Inquiry |
| NKI18/16 | 18 | Inquiry |
| NKI20/16 | 20 | Inquiry |
| NKI22/16 | 22 | Inquiry |
| NKI24/16 | 24 | Inquiry |
| NKI26/16 | 26 | Inquiry |
| NKI28/16 | 28 | Inquiry |
| NKI30/16 | 30 | Inquiry |
| NKI35/20 | 35 | Inquiry |
| NKI40/20 | 40 | Inquiry |
| NKI45/20 | 45 | Inquiry |
| NKI50/25 | 50 | Inquiry |
Model notation identifies a family, not a fixed size. Please confirm bore diameter, outer diameter, overall length, mounting, sealing, material, and load requirements with your drawing.
Every model above links straight to the inquiry form with the model prefilled — send your quantity and destination, and we prepare the quotation.
Options & matching parts
NK is the same bearing without an inner ring, for hardened shaft journals. The heavier NA series covers larger bores and loads.
Ordering from BPK
Samples first if you need to check fit and quality; bulk and OEM orders (your logo, your box) supported. MOQ from 1 piece on standard sizes.
Get a Quote