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Originally Posted by terrykohler
Tom:
Working from memory here, but I believe A286 is not classified as a stainless but rather as a heat resisting or super strength alloy that achieves properties primarily by high nickel content (along with chromium). What is the cost of these nutplates vs. conventional? Do they have a prevailing torque feature? Where might they be used in general aviation? Interesting.
Thanks,
Terry
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They are more expensive figure 2 to 3 times the cost for the popular styles/ sizes, much more for the less popular.
They are really worth it for things like muffler shrouds and like applications.
There are actually very many alloys that are loosely called "Stainless Steel"
as a more layman's term.
In Aerospace terms the loose term is CRES or expand that acronym to (C) corrosion (RE) resistant (S) steel. Almost all can be still identified under many AMS numbers that I cant recall while at home, but there are a bunch of them.
The CRES nutplates have the same performance characteristics as the regular ones with the exception of temperature, and of course increased corrosion resistance.
I think the silver plated ones may not be the best against bare aluminum in a coastal or moist environment.
The prints that I have don't give too many hints how to use them, just from my experience in the field.
Materials engineers feel free to add on!