SKF K50X55X20 needle roller and cage assembly (k / kbk / kzk). Needle roller and cage assembly with no supplied inner or outer race — installed between a hardened, ground shaft and a hardened, ground housing bore. Provides the smallest possible radial cross-section. Series K / KBK per ISO 3245. Suitable for planetary-gear pinions, universal-joint yokes.
| Type | Needle roller and cage assembly (K / KBK / KZK) |
| Designation | SKF K50X55X20 |
| HS code | 8482.40 |
| Bore diameter of needle roller complement | 50 mm |
| Outside diameter | 55 mm |
| Outside diameter of needle roller complement | 55 mm |
| Width | 20 mm |
| Basic dynamic load rating | 25.5 kN |
| Basic static load rating | 60 kN |
| Reference speed | 8500 r/min |
| Limiting speed | 9500 r/min |
| Bearing part | Needle roller and cage assembly |
| Number of rows | 1 |
| Outer ring type | Not applicable |
| Aligning feature | Without |
| Cage | Sheet steel |
| Tolerance class | Normal |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Without |
| Indicative carbon footprint for new product | 0.16 kg CO2e |
| Product net weight | 0.0434 kg |
| eClass code | 23-05-09-03 |
| UNSPSC code | 31171512 |
| Material | As declared by SKF designation suffix |
| Temperature range | Per SKF product data |
| Primary standard | SKF designation convention |
| MOQ | 1 |
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.