F4B 308-SRB-SRH
Flanged roller bearing unit with cast housingFlanged roller bearing units consist of an insert bearing mounted in a cast housing that can be bolted to a machine wall or frame. In addition to being part of a unit, some flanged housings for insert bearings are available as separate components. The SKF assortment includes roller bearing units compliant with several industrial standards, meeting many requirements regarding bolt patterns and mechanisms for locking onto on the shaft.
- Ready to mount
- Factory lubricated and sealed
- Long service life
- Minimal maintenance
- Variety of housing shapes, materials and locking methods
Description
| Metric/inch series | Inch |
| Bearing insert | Spherical roller bearing |
| Bearing position | Locating |
| Locking method | Set screws |
| Bearing housing seal type | Radial lip seal |
Dimensions
| da | 88.9 mm | Shaft diameter |
|---|---|---|
| d2 | 130.175 mm | Collar outer diameter |
| A | 81.756 mm | Housing width |
| A1 | 23.813 mm | Flange thickness |
| A2 | 46.038 mm | Machined face to centre line bearing |
| B | 102.387 mm | Inner ring width |
| J | 170.663 mm | Bolt distance or pitch diameter |
| L | 209.55 mm | Housing length |
| N | 20.638 mm | Bolt hole diameter |
| s | 36.513 mm | Inner ring centre to end |
| S | 0.794 mm | Centre line of locating support |
| T | 112.713 mm | Total width |
| GN | 1/8-27 NPT | Thread of grease fitting |
|---|
Calculation data
| Basic dynamic load rating | C | 253 kN |
|---|---|---|
| Basic static load rating | C0 | 340 kN |
| Fatigue load limit | Pu | 37.5 kN |
| Limiting speed | 2 300 r/min | |
| Limiting value | e | 0.31 |
| Calculation factor | Y1 | 2.2 |
| Calculation factor | Y2 | 3.3 |
| Calculation factor | Y0 | 2.2 |
| Bearing mean diameter | dm | 124.968 mm |
| Axial holding force of the locking mechanism | Pa | 4 kN |
Mass
| Mass bearing unit | 13.1 kg |
Mounting information
| Attachment bolt diameter | G | 0.75 in |
|---|---|---|
| Set screws | 1/2″-20 UNF-3A x 7/8″ | |
| Number of set screws | 2 | |
| Tightening torque for set screws | 70.051 N·m | |
| Grease quantity for relubrication | 13 g |
