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- PB251N Series Normal-Duty Pillow Block
- 1" Shaft
- 4" Bolt Centers
- 1 7/16" Center Line to Base
- Setscrew Locking Collar
features
- Molded glass fiber reinforced polyamide retainer
- Grade 10 balls
- Races and balls are 52100 steel, hardened, ground, and honed for quiet operation
- Slotted bolt holes
- Rugged cast iron or Hub-Alloy® housing
- Zone-hardened inner race
- Prelubricated with high quality lithium grease. 1/4-28 Zerk fitting provided to allow for relube
- Choice of narrow or wide inner race, setscrew locking or eccentric collar locking, normal-duty, or medium-duty bearings
- Knurled cup point setscrews at 120° to minimize inner ring distortion
- Recessed housing base to accommodate uneven mounting surfaces
- Spherical outer race to allow up to 1.5° misalignment
- All bearings have single lip Nitrile rubber seals with steel trash guard
- Steel fingers are standard on wide inner race bearings only
| Mounted Unit Duty | Normal-Duty |
| Bolt Holes | 2 |
| Bearing Type | Ball Bearing |
| Center of Bearing to Front of Inner Ring | 0.768 in |
| Bolt Size | 3/8 in |
| Bolt Hole Spacing | 4 in |
| Housing Construction | 1 Piece |
| Bearing Insert | B250X1 |
| Locking Device | Setscrew Locking Collar |
| Base Width | 1 1/2 in |
| Shaft Dia. | 1 in |
| Insert Type | Steel Insert |
| Misalignment Range | ±1 1/2° |
| Temperature Range [Min] | -25 °F |
| Base Length | 5 1/2 in |
| Housing Height | 2 3/4 in |
| Temperature Range [Max] | 225 °F |
| Bolt Hole Spacing Range [Max] | 4 1/2 in |
| Collar O.D. | 1.328 in |
| Pillow Block Type | Thru-Bolt |
| Inch/Metric | Inch |
| Base Height | 5/8 in |
| Series | PB251N |
| Overall Width | 1 33/64 in |
| Housing Material | Cast Iron - Nickel Plated |
| Housing Width | 1 1/2 in |
| End Type | Open End |
| Seal Type | Contact Seals |
| Bolt Hole Spacing Range [Min] | 3 1/2 in |
| Bearing Design | Non-Expansion |
| Length Through Bore | 1.071 in |
| Lubrication | Relubricatable |
| Weight | 3.0 LB |
| EAN or UPC | 662798249636 |
