On Sun, 14 Jun 2020 07:16:59 +0700, John B.
wrote:

On Sat, 13 Jun 2020 16:58:09 -0700, pyotr filipivich
wrote:

Keeping a bolt tight in a hot frying pan

That's the problem. Lovely non-stick frying pan, but the handle
loosens frequently. Wife got a replacement for the stove, but wants
to keep this one for baking. So, removed the handle.
It was not as I thought, a problem from a steel machine screw
going into an aluminum pan. There is a steel bracket that the screw
threads into.
And there is a split washer on the screw, but it seems to be to
have gotten flattened. While the pan doesn't get really hot, it does,
apparently, get hot enough to remove any temper in that split washer.
So, my question, does anyone know if there are split washers or
the like, made for a "high" temperature environment? This is right
now purely for information. Unless she buys another pan, it is of
purely intellectual interest.

tschus
pyotr

:-) I've been married for nearly 50 years and all that time I've been
tightening handles on cooking pots :-)

K & R make high temperature lock washers

https://www.k-rfastenersinc.com/prod...&cat=3137&page
A good conical spring washer works good too - it is the change in
temperature and differential expoansion that allows them to back off.
The "belleville" type I believe they call them, is a "pretensioning
spring".