RNA Needle Roller Bearings — Sizes & Specifications
The RNA series is the 4900-series needle roller bearing without an inner ring: the hardened shaft journal itself serves as the inner raceway, giving the most compact radial section for gearboxes, pumps and hydraulic motors. The table lists the series size codes; the running bore (Fw) follows your shaft size. BPK supplies RNA4900 to RNA4910, factory-direct from Yandian, Shandong, for importers, distributors and OEM buyers.
Standard sizes
| Model | Series size code | |
|---|---|---|
| RNA4900 | 4900 | Inquiry |
| RNA4901 | 4901 | Inquiry |
| RNA4902 | 4902 | Inquiry |
| RNA4903 | 4903 | Inquiry |
| RNA4904 | 4904 | Inquiry |
| RNA4905 | 4905 | Inquiry |
| RNA4906 | 4906 | Inquiry |
| RNA4907 | 4907 | Inquiry |
| RNA4908 | 4908 | Inquiry |
| RNA4909 | 4909 | Inquiry |
| RNA4910 | 4910 | 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
NA is the same series complete with inner ring; NK and NKI cover the lighter machined-ring range. Send your shaft diameter and housing bore and we confirm the exact specification before quoting.
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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