Bunting Bearings, LLC
Bunting Bearings, LLC
1001 Holland Park Blvd.
Holland, OH 43528
Phone: 419.866.7000
Fax: 419.866.0653
E-Mail: bunting@buntingbearings.com
Website: www.buntingbearings.com
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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
1 2 3 

Item #

Stock
Item?

Nom
Size I.D.

Nom
Size O.D.

Recommended Housing
Bore Min.

Recommended Housing
Bore Max.

Recommended Shaft
Size Min.

Length

M2515BU N/A Yes N/A 25 mm N/A 28 mm N/A 28.0000 mm N/A 28.0210 mm N/A 24.9590 mm N/A 15 mm
M2520BU N/A Yes N/A 25 mm N/A 28 mm N/A 28.0000 mm N/A 28.0210 mm N/A 24.9590 mm N/A 20 mm
M2525BU N/A Yes N/A 25 mm N/A 28 mm N/A 28.0000 mm N/A 28.0210 mm N/A 24.9590 mm N/A 25 mm
M2530BU N/A Yes N/A 25 mm N/A 28 mm N/A 28.0000 mm N/A 28.0210 mm N/A 24.9590 mm N/A 30 mm
M2550BU N/A Yes N/A 25 mm N/A 28 mm N/A 28.0000 mm N/A 28.0210 mm N/A 24.9590 mm N/A 50 mm
M2820BU N/A Yes N/A 28 mm N/A 32 mm N/A 32.0000 mm N/A 32.0250 mm N/A 27.9590 mm N/A 20 mm
M2830BU N/A Yes N/A 28 mm N/A 32 mm N/A 32.0000 mm N/A 32.0250 mm N/A 27.9590 mm N/A 30 mm
M3020BU N/A Yes N/A 30 mm N/A 34 mm N/A 34.0000 mm N/A 34.0250 mm N/A 29.9590 mm N/A 20 mm
M3025BU N/A Yes N/A 30 mm N/A 34 mm N/A 34.0000 mm N/A 34.0250 mm N/A 29.9590 mm N/A 25 mm
M3030BU N/A Yes N/A 30 mm N/A 34 mm N/A 34.0000 mm N/A 34.0250 mm N/A 29.9590 mm N/A 30 mm
M3040BU N/A Yes N/A 30 mm N/A 34 mm N/A 34.0000 mm N/A 34.0250 mm N/A 29.9590 mm N/A 40 mm
M3240BU N/A Yes N/A 32 mm N/A 36 mm N/A 36.0000 mm N/A 36.0250 mm N/A 31.9500 mm N/A 40 mm
M3520BU N/A Yes N/A 35 mm N/A 39 mm N/A 39.0000 mm N/A 39.0250 mm N/A 34.9500 mm N/A 20 mm
M3530BU N/A Yes N/A 35 mm N/A 39 mm N/A 39.0000 mm N/A 39.0250 mm N/A 34.9500 mm N/A 30 mm
M3550BU N/A Yes N/A 35 mm N/A 39 mm N/A 39.0000 mm N/A 39.0250 mm N/A 34.9500 mm N/A 50 mm
M4020BU N/A Yes N/A 40 mm N/A 44 mm N/A 44.0000 mm N/A 44.0250 mm N/A 39.9500 mm N/A 20 mm
M4030BU N/A Yes N/A 40 mm N/A 44 mm N/A 44.0000 mm N/A 44.0250 mm N/A 39.9500 mm N/A 30 mm
M4040BU N/A Yes N/A 40 mm N/A 44 mm N/A 44.0000 mm N/A 44.0250 mm N/A 39.9500 mm N/A 40 mm
M4050BU N/A Yes N/A 40 mm N/A 44 mm N/A 44.0000 mm N/A 44.0250 mm N/A 39.9500 mm N/A 50 mm
M4530BU N/A Yes N/A 45 mm N/A 50 mm N/A 50.0000 mm N/A 50.0250 mm N/A 44.9500 mm N/A 30 mm
M4550BU N/A Yes N/A 45 mm N/A 50 mm N/A 50.0000 mm N/A 50.0250 mm N/A 44.9500 mm N/A 50 mm
M5040BU N/A Yes N/A 50 mm N/A 55 mm N/A 55.0000 mm N/A 55.0300 mm N/A 49.9500 mm N/A 40 mm
M5060BU N/A Yes N/A 50 mm N/A 55 mm N/A 55.0000 mm N/A 55.0300 mm N/A 49.9500 mm N/A 60 mm
Unit of Measure
1 2 3