NA Needle Roller Bearings — Sizes & Specifications
The NA series is a machined-ring needle roller bearing complete with inner ring — the general-purpose needle bearing for gearboxes, pumps, compressors and agricultural machinery. The model number follows the 4900 series code, listed here with its bore. BPK supplies NA4900 to NA4910, factory-direct from Yandian, Shandong, for importers, distributors and OEM buyers.
Standard sizes
| Model | Bore d (mm) | |
|---|---|---|
| NA4900 | 10 | Inquiry |
| NA4901 | 12 | Inquiry |
| NA4902 | 15 | Inquiry |
| NA4903 | 17 | Inquiry |
| NA4904 | 20 | Inquiry |
| NA4905 | 25 | Inquiry |
| NA4906 | 30 | Inquiry |
| NA4907 | 35 | Inquiry |
| NA4908 | 40 | Inquiry |
| NA4909 | 45 | Inquiry |
| NA4910 | 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
RNA is the same series without an inner ring, where the shaft journal serves as the raceway; NAV is the full-complement version for high load at low speed.
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.
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