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SELF-LUBRICATING OIL-LESS TYPE BUSHINGS

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Self-Lubricating
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Plug graphiting is accomplished by drilling a rowed, staggered hole configuration through the bearing wall and pressing graphite into these holes and hard baking.  The size and number of drilled holes and the number of rows is determined by the bearing length and diameter.

 

Graphited bearings are not designed to replace bronze sleeves lubricated by oil films but there are many definite applications in which they can deliver superior service if designed properly.  They have been used in designs where part location makes normal lubrication procedures difficult (or neglect likely); where shaft speed is too slow to sustain a proper film, (generally below 30 surface feet per minute); where lubricant escape is unsuitable or detrimental to operations; where high operating temperatures could burn out oil or greases, or where bearings must operate in a sealed condition.  Graphited bearings have also been used in many underwater applications.

 

Graphited bearings should be soaked in lubricant prior to application.  The graphite absorbs the lubricant, which is then transferred to the shaft when heated by the shaft motion.  This action provides oil needed to lubricate but not in sufficient quantity to cause leakage at the bearing ends.  The oil is re-absorbed by the graphite when motion ceases.

 

Whenever possible, periodic re-soaking of graphited bearings will, of course, aid in maximizing operating efficiently and prolonging bearing life.

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C863
Manganese Bronze
with Graphite Plugs

Spec Sheet

Inch Sleeves

Metric Sleeves

Metric Flanges

Metric Washers


For questions or to place an order call 1-800-969-2721.

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