Ajoeiam has the right answer. I regularly used the same machinery's handbook, or other Engineering almanac, with the appropriate tables for fits. As I was working on car engines (e.g.) the engine blocks made from cast iron, with steel tubes fitted followed the tables. But when I did some calculations for aluminuim blocks and steel tubes, the fits didn't work. The expansion and contraction difference between steel and aluminium from -30C to + 85C block temperature meant the steel either cracked the block at coldest, or the tube became loose at top temperature. So a sliding fit (at factory 20C) with a dot of loctite cured all evils, when durability tested at the extreme temperatures. (From Cold start -30C in Finland, up to the hottest block temperatures when pulling fully laden going up a mountain pass, with max trailer load, in the Middle East or North African mountains and Saharan temperatures).
But of course you just want the simple answer, so follow the tables.
If using 2 different metals, "choose the fit half way between the 2 figures quoted in the tables" was the crude-rule used in another design office where I worked 35 years ago.... That was for bronze bushes pressed into stainless steel plate, or stainless steel parts pressed into gun-metal castings, -25C to + 70C. - It worked.... Probably the same design technology that Goldstar experienced post stone age, but some modern engineer will have a computer programme to work it out now.
K2
