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Bunting “BU” Dry Lubricant
Bearings

Bunting’s “BU” product is a composite material, consisting of bonded layers of a steel backing and a porous bronze matrix, impregnated and overlaid with PTFE bearing material. The steel backing provides mechanical strength and the bronze inter-layer, impregnated with PTFE, provides a strong mechanical bond for the lining. During normal operation, a thin film from the PTFE lining is transferred to the opposing surface and maintained there throughout the working life of the bearing.

Bunting’s “BU” is available, from stock, in the form of wrapped bearings in both inch and metric sizes. Thrust washers, strip material and non-standard bearing sizes are also available.

Temperature range: -328°F/+536°F

WARNING: This product can expose you to chemicals including Nickel, Lead & Tetrafluoroethylene which is known to the state of California to cause cancer. Lead and Nickel which are known to the state of California to cause birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
BU Dry Lubricant Bearings METRIC Sizes
Unit of Measure
Items BU Dry Lubricant Bearings METRIC Sizes
M0303BU
BU Dry Lubricant Bearings METRIC Sizes
BU Dry Lubricant Bearings METRIC Sizes
M0305BU
BU Dry Lubricant Bearings METRIC Sizes
BU Dry Lubricant Bearings METRIC Sizes
M0306BU
BU Dry Lubricant Bearings METRIC Sizes
BU Dry Lubricant Bearings METRIC Sizes
M0404BU
BU Dry Lubricant Bearings METRIC Sizes
BU Dry Lubricant Bearings METRIC Sizes
M0406BU
BU Dry Lubricant Bearings METRIC Sizes
Stock Item?1 N/A No N/A No N/A Yes N/A No N/A Yes
Nominal Size I.D. N/A 3 mm N/A 3 mm N/A 3 mm N/A 4 mm N/A 4 mm
Nominal Size O.D. N/A 4.5 mm N/A 4.5 mm N/A 4.5 mm N/A 5.5 mm N/A 5.5 mm
Recommended Housing Bore Min. N/A 4.5000 mm N/A 4.5000 mm N/A 4.5000 mm N/A 5.5000 mm N/A 5.5000 mm
Recommended Housing Bore Max. N/A 4.5080 mm N/A 4.5080 mm N/A 4.5080 mm N/A 5.5080 mm N/A 5.5080 mm
Recommended Shaft Size Min. N/A 2.9940 mm N/A 2.9940 mm N/A 2.9940 mm N/A 3.9920 mm N/A 3.9920 mm
Recommended Shaft Size Max. N/A 3.0000 mm N/A 3.0000 mm N/A 3.0000 mm N/A 4.0000 mm N/A 4.0000 mm
Length N/A 3 mm N/A 5 mm N/A 5 mm N/A 4 mm N/A 6 mm
Length Tolerance N/A +/-0.38 mm
Installed Bearing I.D. Min N/A 3.0000 mm N/A 3.0000 mm N/A 3.0000 mm N/A 4.0000 mm N/A 4.0000 mm
Installed Bearing I.D. Max N/A 3.0480 mm N/A 3.0480 mm N/A 3.0480 mm N/A 4.0480 mm N/A 4.0480 mm
Min. Temperature N/A -328 ºF
Max. Temperature N/A 536 ºF
P Value (Max.) N/A 36250
V Value (Max.) N/A 1000
PV Value (Max.) N/A 51000
  • 1 Minimum quantities may apply to non-stock items, please contact customer service for more information.