Watch out for rust staining on stainless fittings

I went to replace the snap carabiners that we use on the davit wires to hoist our tender up. I went to tighten the shackle and this happened. A reminder not to ignore rust staining. It isn’t always merely cosmetic.
View attachment 151372
View attachment 151373
Looking at the way the bolt has failed, I wonder if the cause was sea water trapped between the two faces of the thread - over a period of some years?
 
I had alittle Macwester double ended and found after a year the stainlesssteel machine screws holding on the rudder where actually just the heads holding on by a thin film of metal with the core completely gone
 
I had alittle Macwester double ended and found after a year the stainlesssteel machine screws holding on the rudder where actually just the heads holding on by a thin film of metal with the core completely gone
What's wrong with that? Any RN Dockyard would fix that with some super glue.
 
Thanks for posting. It is indeed easy to dismiss as light staining, just surface discolouration.

I would be more worried about the 1858 lead line surveys! (-;
 
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