RNA4922 Bearing — Cross-Reference & Equivalents
The RNA4922 is a needle roller bearing with ISO 1206 boundary dimensions 125×150×40 mm. The table below lists how 8 major brands designate it, with catalog links and interchange notes.
Replacing a RNA4922? The cross-reference table below gives the equivalent part number for every major brand — but read the interchange rules first: an identical size is not always a safe swap.
Specifications
| Roller circle Ø (Fw) | 125 mm |
|---|---|
| Outer Diameter (D) | 150 mm |
| Width (B) | 40 mm |
| Type | Needle Roller Bearing |
| Standard | ISO 1206 |
Cross-Reference by Brand
| Brand | Part No. | Boundary dims | Catalog |
|---|---|---|---|
| SKF | RNA4922 | match | SKF catalog ↗ |
| NSK | RNA4922 | match | NSK catalog ↗ |
| FAG | RNA4922 | match | FAG catalog ↗ |
| NTN | RNA4922 | match | NTN catalog ↗ |
| KOYO | RNA4922 | match | KOYO catalog ↗ |
| NACHI | RNA4922 | match | NACHI catalog ↗ |
| Timken | RNA4922 | match | Timken catalog ↗ |
| INA | RNA4922 | match | INA catalog ↗ |
Interchange notes
All brands build this designation to the same boundary dimensions (roller inscribed circle Fw, outer diameter D, width B), so the mounting envelope is interchangeable. But needle roller bearings have specific limits: (1) This is an RNA (no inner ring) type — the needles run directly on the shaft, so the shaft seat must be a hardened, ground raceway (Fw is the roller circle, NOT a plain bore). The NA version (with a separate inner ring) is a different part and is not interchangeable with RNA. (2) Needle bearings carry high radial load in a small radial section but take NO axial load. (3) Caged vs full-complement (more needles, higher load but lower speed) are not interchangeable. (4) Match the seal (open / 2RS) and cage type across brands. Load ratings (dynamic Cr, static C0r) are intentionally NOT listed here: they vary by brand and internal design and are a safety-critical selection parameter — read them directly from the manufacturer catalog linked in the table above.
Where to buy a RNA4922
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FAQ
What bearings are equivalent to a RNA4922?
The RNA4922 is built to ISO 1206 boundary dimensions 125×150×40 mm by SKF, NSK, FAG, NTN, KOYO, NACHI, Timken, INA. All share the same mounting envelope; match clearance, precision class and (where applicable) seal suffix before substituting.
What are the dimensions of a RNA4922 bearing?
Bore 125 mm, outer diameter 150 mm, B 40 mm (ISO 1206).
Does the RNA4922 need a hardened shaft?
Yes. The RNA4922 is an RNA-type needle bearing with no inner ring, so the needles run directly on the shaft — the shaft seat must be a hardened, ground raceway. Its first dimension (125 mm) is the roller inscribed circle Fw, not a plain bore. The NA version with a separate inner ring is a different part. It carries high radial load but no axial load; match cage type and seal across brands.
Related sizes
Boundary-dimension cross-reference only. Per the applicable ISO standard (ISO 15 for ball, ISO 355 for tapered), the boundary dimensions are common across brands, so the mounting envelope is interchangeable. This is NOT a drop-in part equivalence. Internal clearance, precision class, seal/shield type (where applicable), cage material and factory lubrication are encoded in brand-specific suffixes and must be matched separately. Always verify against the manufacturer's catalog before substituting.