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Thank you, bf109g! Very helpful info!!

Thanks to all of you. I found what I was looking for. Just for completeness, where do you get the ESNA nutplate detail information from? IHS site doesn't recognize them.

Thanks Wil for your detailed reply. Parts shortage was clearly a procurement failure, and I am obliged to choose an alternative among available ones. You know production line cannot stop. When you say A286 passivated bolts have galling issues, you mean "that sort of superficial welding"? The...

Has anyone a helpful tip where to find nutplates catalogs (to be used for aircraft)?

Chromium plated bolted were specified on drawing by other engineers, so I can only guess for what reason. It seems to me that the main reason is the temperature in one case and the wear in another one. Both are drawings for flying parts. Now I feel confident to replace them with cres passivated...

NAS6703-20 are A286 cres bolts, passivated. Since we are unable to find NAS6603-20 alloy steel chromium plated bolts, I asked what do you think of replacing them with cres passivated bolts, in areas where wear is a concern.

Have someone a clear idea of the different performances of dry film lubricated and soluble film lubricated threads?

Chromium plated bolts are not easy to buy and often my company procurement ask for substitute parts. What would you use as subsitute part for bolts like NAS660()C()? Would you recommend use of NAS670()U() as replacement, which is cres passivated?