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Attached is what I found with a quick search for
locknuts with plastic/nylon inserts. The max temperature range is listed
as 250F. The metal ones go up to 1000F. So perhaps metal is overkill
- but 250F does not provide me with a comfort margin I would like under the
cowl.
I agree that the prop bolt nuts should never see
250F, but, the question is what effect elevated temperatures short of 250F do to
the life of the material.
So it would appear that what ever makes you feel
comfortable would be the way to go. Me, for the prop and most
things forward of the firewall, I'll continue to use the Metal Lock nuts.
Ed
Ed Anderson
RV-6A N494BW Rotary
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Matthews, NC
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