GRAPHALLOY Bushings designed for higher temperature
application will have an interference fit of + .010" to .025", depending
1) The maximum temperature to be
2) The material of the
housing and shaft, and
3) The size of
the I.D. of the housing.
thermal expansion coefficient is only about half steel's coefficient of thermal
expansion. The busing must be designed, therefore, with adequate press fit (+.010"
to .025") to make up for the greater expansion of the housing at elevated
temperatures. Otherwise, the housing would expand beyond the bushing O.D. and
the bushing would not remain tight in the housing.