SKF F4B50M-FM flanged ball bearing unit (ucf / ucfc / ucfl). Square four-bolt (UCF), round three-bolt (UCFC) or oval two-bolt (UCFL) flanged housing pre-assembled with a spherical-outer-ring insert bearing. Absorbs shaft-to-housing misalignment on assembly. Set-screw shaft attachment on standard UC-series insert; eccentric-collar (UEL) or adapter-sleeve (UK) variants available. Dimensioned to ISO 3228 / DIN 626.
| Type | Flanged ball bearing unit (UCF / UCFC / UCFL) |
| Designation | SKF F4B50M-FM |
| HS code | 8483.20 |
| Shaft diameter | 50 mm |
| Housing overall width | 46 mm |
| Width, total | 61.7 mm |
| Centre distance between bolt holes | 111.1 mm |
| Bearing width, total | 43.7 mm |
| Attachment bolt diameter | 12 mm |
| Basic dynamic load rating | 35.1 kN |
| Basic static load rating | 23.2 kN |
| Limiting speed | 4000 r/min |
| Note | Limiting speed with shaft tolerance h6 |
| Housing type | Flanged |
| Flanged housing type | Square |
| Number of bolt holes for fasteners | 4 |
| Fastening bolt hole type | Plain |
| Retaining feature, inner ring | Eccentric collar |
| Bore type | Cylindrical |
| Rubber seating ring | Without |
| Material, housing | Cast iron |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing, bearing | Seal on both sides |
| Sealing type | Contact, standard |
| Sealing, unit | Optional end cover |
| Lubricant | Grease |
| Relubrication hole | With |
| Grease fitting | With |
| Product net weight | 2.23 kg |
| eClass code | 23-05-16-01 |
| UNSPSC code | 31171536 |
| 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.