Pillow Block, Self Aligning, SAE 840 Bronze Bearing

PB0-250-B

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Part #: PB0-250-B
Mounted Part #: FSB-250
Bearing Type: Plain
Self Aligning: Self-Aligning
Mounting: Aluminum Pillow Block
Nominal ID: .25"
ID Minimum: .2508"
ID Maximum: .2513"
Max Radial Load: 188 lbf
Max Speed: 18300 rpm
Weight: .39 oz
Allowable Motions: Linear
Oscillating
Rotating
Available Options: Clear Zinc Plated (CZP)

Standard finish: black oxide

Centerline to base (A) : .380"
Base length (B) : 1.44"
Bolt hole center to center (C) : 1.13"
Overall height (D) : .75"
Width (E) : .38"
Mounting hole diameter (F) : .203"
Mount base thickness (G) : .19"

Manufactured to SAE 840 specification, each bearing contains 25% oil by volume. Spyraflo only uses the highest quality sintered bronze material instead of blended bronze which contains iron. These bearings offer an economic solution for applications requiring low to moderate loads and speeds with zero maintenance.

The spherical bronze bearing acts as an oil reservoir. Rotation of the shaft under load creates a hydrodynamic action where oil is drawn to the surface, creating a film of lubricant between the bearing and shaft. Bronze bearings are ideal for paper handling applications where the bearings allow static electricity to dissipate from the shaft through the bearing to the machine frame.

SAE 840 Bronze
Material Content / Structure 87.2% - 90.5% Copper / 9.5% - 10.5% Tin; 5% Mobil Medium Oil (45 Viscosity)
Shaft Requirements MIN hardness of 95 Rockwell B, Recommended surface finish: 16 RMS (.4 Ra)
Operating Temperature -20° to 200° Fahrenheit
-29° to 93° Celsius
PV Ratings
P - Pressure (Standard) 2000 PSI
P - Pressure (Metric) 13.79 N/mm^2
V- Velocity (Standard) 1200 FPM
V- Velocity (Metric) 6 m/s
PV - Pressure x Velocity (Standard) 25000 PSI x FPM
PV - Pressure x Velocity (Metric) 1.72 N/mm^2 x m/s
Friction Coefficient µ 0.04 to 0.35
Options Lubricant
Storage Clean, dry storage in plastic bags or bins to prevent oil loss. NOTE: Bronze must not contact absorbent materials (paper, cardboard, etc.) which can wick away oil.
Maintenance Maintenance free
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