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During shipping, parts will experience extreme temperatures and unexpected loads. Also consider the size of your part, and what can be assembled at the final destination.
Fits
Press Fits
A good rule of thumb for a press fit diametral interference is 1/1000th of the diameter you are trying to fit. So if you have 10mm shaft, Press fits are typically defined using ISO-standard fits when designing metric parts. Press fits for components under 6mm in diameter should use an M7 fit, while components over 6mm in diameter should use an N7 fit.