Needle Roller Bearings
Needle roller bearing RNA4905
Needle roller bearing RNA4905, machined (heavy-duty), metric, caged, without inner ring, boundary dimensions 30 mm × 42 mm × 17 mm. Specifications below are model-bound catalog values; send your application details through the RFQ for a confirmed quotation.
Last updated: 2026-10
Specifications
| Specification | Value |
|---|---|
| Bore diameter (d) | 30 mm |
| Outside diameter (D) | 42 mm |
| Width (B) | 17 mm |
| Minimum chamfer (r min.) | 0.3 mm |
| Basic dynamic load rating (Cr) | 24.3 kN |
| Basic static load rating (C0r) | 31.7 kN |
| Fatigue load limit (Cu) | 4.9 kN |
| Limiting speed, grease lubrication | 9700 min-1 |
| Limiting speed, oil lubrication | 15000 min-1 |
All values above are model-bound catalog values traceable to a collected source. Fields without collected evidence are not published; ask with your inquiry and we confirm them at quotation.
Applications and selection notes
Needle roller bearings carry high radial load in a small radial section. The needle-shaped rollers give a large load-carrying contact area inside a thin cross-section, which makes the type the standard choice where the radial space is limited: planetary gears, universal joints, pivot and rocker pins, hydraulic pumps and textile heads. The drawn-cup and machined-ring executions differ in how they are mounted and whether they need a hardened shaft raceway.
How to read the specification table
For drawn-cup and machined-ring needle bearings the shaft surface often acts as the inner raceway, so shaft hardness, finish and material enter the selection alongside the bearing’s own load rating. The table’s ratings are catalog values for the designation; the achievable life of the position depends on the mating raceway. Send shaft details with the RFQ when the bearing runs directly on the shaft.
Further reading
RNA4905 — buying questions
What does the designation RNA4905 mean?
RNA4905 is a standard boundary-dimension designation: the dimension series fixes the outside diameter and width proportions, and the bore code fixes the bore diameter — 30 mm for this bearing. Two bearings carrying the same designation from conforming manufacturers are dimensionally interchangeable; execution (seals, clearance class, cage) is the part that can differ, so state the execution you need when you request a quotation.
Are the catalog load rating and speed of RNA4905 enough for my application?
The table lists Cr = 24.3 kN and a catalog limiting speed of 9700 min-1. The load rating is the starting point of a life calculation, and the limiting speed is a catalog value for the manufacturer’s execution — seals, fits, temperature and lubrication all reduce the usable speed in a real assembly. Send the application conditions with your inquiry and we confirm suitability before quoting; do not size from the catalog speed alone.
What information do you need to quote RNA4905?
Four things, in one message: the designation (and execution — seals, clearance class, precision class, if not standard), the quantity, the destination country, and any documents you require. Application conditions such as speed, load direction and temperature are welcome and let us verify the execution instead of assuming it. Quotation, lead time and the exact document set come back in writing.
Ordering & documentation
Documents
Standard export documentation — commercial invoice, packing list and certificate of origin — accompanies every shipment. The exact document set for your order, and any material or inspection paperwork you require alongside it, is confirmed in writing at quotation before the order is placed.
Quotation
To quote RNA4905, send: the designation and required execution, quantity, destination country, and any required documents. Adding the application conditions (speed, load direction, temperature, fit) lets us confirm the execution and clearance class instead of quoting blind.
Sample & supply
Sample quantities of standard-designation bearings such as RNA4905 are available for evaluation before a bulk order. Bulk supply runs through own production plus a qualified outsourcing network, so catalog items are not capped by own-factory capacity; the confirmed lead time is stated in the quotation.
Current confirmed lead-time practice: 15-30 business days for bulk standard bearings; 5-10 for samples. Standard quality system: ISO 9001.
Storage & shipping
Bearings are packed moisture-protected for export and should be stored flat, in unopened original packaging, in a dry indoor area away from temperature swings. Do not unwrap or rotate bearings before mounting; rotate only by the ring being pressed, never through the rolling elements.