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Interference fit - avoid galling with aluminum

I am working on a design involving an interference fit between an aluminum 7075 part (ideally anodized or hard anodized) and a steel part (SS or standard steel protected against corrosion). The parts will need to be disassembled at some point. The shaft will be screwed into the bore as there are threads at the extremity of the shaft, while the other portion will have a slight interference fit with the bore.
I am concerned that the parts could stick together, as I experienced some SS screws sticking on anodized aluminum in the past.
Would you have any suggestion to avoid sticking of the parts ?
Thanks,

Benoit Gilbert
Product designer - Quebec city, QC, Canada
February 10, 2011

To me, an interference fit is a press fit. Many things will gall as you tighten the "bolt". Lubrication or silicon spray are about the only answers after using dissimilar metals.

James Watts
- Navarre, Florida
February 15, 2011

What if I would use silver coating on the SS screw ?

Benoit Gilbert
- Quebec, QC, Canada
February 17, 2011

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