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simmonsstummer

rusty screws

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Posted · rusty screws

I haven't looked at it closely but I noticed the same thing myself. However, I think it might actually be something like copper paste for lubrication rather than rust.

 

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Posted · rusty screws

If the knurled nut is zinc-plated and the screw is made out of stainless steel then the knurled nut will soon show rust when the two are kept in an environment with high humidity. It's a question of the standard electrode potential.

 

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