P2B 308-SRB-SRE
Pillow block roller bearing unit, two-bolt, set screw lockingPillow (plummer) block roller bearing units and take-up roller bearing units consist of a spherical or tapered roller bearing mounted in a non-split housing that can be bolted to a support surface. This variant has a spherical roller bearing, a two-bolt base and set screw locking, holding the shaft firmly against the inner ring of the bearing. The units are sealed and lubricated and ready to use. This bearing unit covers a wide range of requirements, in inch dimensions.
- Ready to mount
- Robust
- Factory lubricated and sealed
- Quick mounting
- Long service life
Description
| Metric/inch series | Inch |
| Bearing insert | Spherical roller bearing |
| Bearing position | Non-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 | 80.963 mm | Housing foot width |
| B | 102.394 mm | Inner ring width |
| H | 95.25 mm | Height base to center |
| H1 | 57.15 mm | Housing foot height |
| H2 | 192.088 mm | Housing height |
| J | min. 234.95 mm | Distance between attachment bolts, max. |
| J | max. 282.575 mm | Distance between attachment bolts, min. |
| J | 246.063 mm | Distance of attachment bolts |
| L | 330.2 mm | Housing length |
| N | 25.4 mm | Width foot slot width |
| N1 | 49.213 mm | Length of attachment bolt hole |
| s | 36.513 mm | Centre line unit to side face of inner ring |
| S | 0.794 mm | Centre line of “fixed” bearing |
| T | 107.156 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 |
Safe loads
| P90° | 64.9 kN | Safe load at 90° |
|---|---|---|
| P135° | 40.9 kN | Safe load at 135° |
| P180° | 50.3 kN | Safe load at 180° |
Mass
| Mass bearing unit | 15.1 kg |
Mounting information
| Attachment bolt diameter | G | 0.875 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 |
