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NPB 68NU56 Bearing Inch Series | Self-Lubricating Bearing
- NPB Part No.
- 68NU56
Specifications
- Inch or Metric
- Inch
- Lubrication
- Self-lubricating
- Bearing Length
- 3 1/2"
- Nominal Bearing Bore
- 4 1/4"
- Recommended Shaft Diameter
- 4.2500 - 4.2478"
- Recommended Housing Diameter
- 4.4358 - 4.4372"
- Installed Bearing Inside Diam.* ID
- 4.2502 - 4.2568"
- Flanged
- No
- Materials
-
- Liner: PTFE-lead overlay
- Substrate: Sintered bronze
- Backing: Plated low-carbon steel
- Loads - P
-
- Dynamic loads up to 20,000 PSI
- Static loads up to 36,000 PSI
- Compressive yield strength of 44,000 PSI
- Speed - V
-
- Up to 1000 FPM unlubricated
- Up to 2000 FPM lubricated
- Performance - PV
-
- PV to 50,000 PSI - FPM - continuous operation
- PV to 100,000 PSI - FPM - intermittent operation
- Temperature Range
- –328°F to +536°F
- Coefficient of Friction
- 0.02 - 0.20 Static/Dynamic
- Shaft Finish
-
- A surface finish of better than 16 micro inches is recommended
- Above 32 micro inches, bearing life is reduced by more than 50%
* When installed in a rigid steel or cast-iron housing
Length Tolerances: Up to and including 3/8 inch I.D. or length – ±0.015 inch. Above 3/8 inch I.D. or length – ±0.010 inch
Length Tolerances: Up to and including 3/8 inch I.D. or length – ±0.015 inch. Above 3/8 inch I.D. or length – ±0.010 inch
Interchange
National Precision Bearing Part No 68NU56 is an interchangable replacement for these common bearing part numbers:
- Isostatic Bearing
- 68TU56
- Garlock Bearing
- 68DU56
