Doesn't sound fishy at all to me. But I have much experience
stripping threads. It is easy, just make it snug,then a "bit tighter".
Or, the threads could have been damaged by the original installer.
That happens too (just not as often). If the fit was a bit on the
loose side initially, it could look like a lot of the thread remains.
With little stress or vibration, it could remain happily in place for
some time. Of course, installing the wrong diameter screw with the
correct pitch could do the same.
At 04:15 PM 4/13/2010, Hal Murray wrote:
[email protected] said:
> I recently installed a new ion pump in an EFOS2 Hydrogen maser and two of
> the mounting holes (metric M5) have damaged threads.
> The bolts go in fine but wont tighten and if you wiggle the bolt you can
> pull it out.
That sounds fishy.
Do the holes look chewed up? Did somebody strip the threads?
Are you using the right size bolt?
Can you get a nut on the back side of the hole?
--
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