In article , Jeepers says...

unknown thread pitch

Until you find out what that is, you have zero
chance of matching the correct fastener for replacement.
The 0.050 major diameter roughly matches a number
zero sized screw but it could be a special from the
manufacturer. If you could see how many threads per
inch, by counting the crests under a loupe then you
could find out if it were 80 threads per inch, a common
screw.

Jim

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