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SciroccoEV wrote: ↑Mon May 31, 2021 5:09 pm Bolt is for compression, not conduction. Plated steel, or stainless (A4 grade) will do.

Ah! Makes total sense, thanks SciroccoEV!
Got any suggestions for washers, or plated/stainless ok for that too?

A Belleville washer (conical spring washer). They're available in various materials, including stainless.