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Many of the adapters and screw interfaces used in astro and general photography are made from Aluminium which has a wonderful habit of sticking to itself / galling. Even Stainless steel exhibits this to a lesser extent, especially when silver plated and steel has the unfortunate propensity to rust on as well as gall. Brass is wonderful in such situations, but not very widespread in its use although it is often nickel/chrome plated and used for many lens and camera mount flanges.
The best easily applied defence against thread sticking/ galling at "normal temperatures" is an anti seize often silver or copper loaded based compound, sometimes aluminium loaded graphite/moly-grease available usually in paste, but sometimes stick form.
Best
JA
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