ROC Carbon self-lubricating bearings and bushings are available
in material grades selected to meet the specified service
requirements. We provide standard replacement styles as
well as custom-designed parts for specific operating problems.
Parts range from simple sleeve bushings to more complex
styles incorporating notches, grooves or metal reinforcing
Carbon/graphite grades selected should be compatible both
with the fluids being handled and the operating parameters.
The typical materials used are from our Groups A, C, E,
and F grades. Group C and Group F grades are used in general
purpose applications. Group A grades are resin-impregnated
for chemical applications. Group E grades are metal-impregnated
for improved heat dissipation, wear and strength characteristics.
Depending on the application, various types of metal-impregnated
carbon/graphite can be used. For higher operating temperatures,
Group B grades with an an oxidation inhibitor are used.
Metal-backed bearings for extreme
ROC Carbon also manufactures metal-backed carbon/graphite
bearings for use in extreme service. The metal selected
should have good corrosion resistance, thermal conductivity,
or other properties as required by the service. The coefficient
of thermal expansion is a factor in metal selection due
to the difference in expansion coefficients of metal and
Press fitting and shrink fitting
The method used to assemble the carbon into the metal housing
depends on the carbon grade used, the metal selected, and
the operating temperature. Press fitting is generally used
for low-temperature applications, where relatively low interference
is needed to keep the carbon from rotating independently.
Shrink fitting is used for high-temperature applications
requiring greater interference to prevent carbon rotation.
In shrink fitting, the carbon is dropped into a heated metal
housing. When the metal cools, the housing shrinks and seizes
ROC Carbon's engineering staff is available to help you
evaluate bearing and bushing problems and to recommend solutions
involving seal geometry and material. For nonstandard parts
for modified machines, we will recommend the proper bore
sizes and materials for optimum performance.
For original equipment replacement parts, please furnish
the OEM part number or the specifications of the machine.
For custom-designed parts, we manufacture according to your
drawings, or, if you wish, we will design a seal for you.
For fastest response, call our toll-free number: