cavelamb himself wrote:
Nick Mueller wrote:

Jon Danniken wrote:


While the factory doesn't specify the grade, the nuts they go into
have a six (or possibly a 60) on them.



That's grade 6. Standard is grade 8. The mating strength for a bolt
would be
grade 8.8. Grade 10.9 is just a waste of money. Sure, they are more
brittle
(they can't be *stretched* as much before they fail) but there is no
construction that requires a *plastic* stretch.

So it is OK.


Nick



I disagree with the "no construction that requires a *plastic* stretch"
part.

That's a common requirement in almost all aircraft construction.

I'm guessing the difference between your opinions is the difference
between intentional plastic deformation as part of the design and
plastic deformation in an emergency.

Best wishes,

Chris