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Posted by spaco on April 9, 2006, 12:24 pm
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So, I want to fasten things together outside where they will see all the
weather that is there. In order to be able to disassemble the
components years later, I use stainless steel bolts and nuts that I buy
from Fastenal. Sounds good to me, but guess what? The threads gall
when I have to take an assembly apart just a few months after they are
installed! Almost every bolt has this problem.
Smarter now, I have heard that "you can't do that"! You can use
stainless steel bolts, but with plain steel plated nuts, for instance.
My question: To those of you who know what I'm talking about, what
other solutions do you use?
Pete Stanaitis
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Posted by Ecnerwal on April 9, 2006, 12:30 pm
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> My question: To those of you who know what I'm talking about, what
> other solutions do you use?
Never-Seeze, or a similar anti-seize compound. Or Loctite - depends on
how easily you want them to come apart, .vs. stay put. Axle grease in a
pinch, but anti-seize is better.
--
Cats, coffee, chocolate...vices to live by
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Posted by rigger on April 9, 2006, 12:39 pm
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>Never-Seeze, or a similar anti-seize compound.<
I use the copper bearing type; works great.
dennis
in nca
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Posted by jim rozen on April 9, 2006, 1:13 pm
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>My question: To those of you who know what I'm talking about, what
>other solutions do you use?
If you talk to folks who assemble stainless vacuum systems, they'll
tell you that the quickest way to having a nut permanently installed
on a bolt is to assemble them dry, and then bake above 100C.
You have to cut them apart. The answer is just put some molykote
on them before assembly. The nickle and copper based anti-sieze
compounds work too. Doesn't take much.
Jim
--
==================================================
please reply to:
JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com
==================================================
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Posted by Kristian Ukkonen on April 9, 2006, 2:22 pm
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spaco wrote:
> So, I want to fasten things together outside where they will see all the
> weather that is there. In order to be able to disassemble the
> components years later, I use stainless steel bolts and nuts that I buy
> from Fastenal. Sounds good to me, but guess what? The threads gall
> when I have to take an assembly apart just a few months after they are
> installed! Almost every bolt has this problem.
> Smarter now, I have heard that "you can't do that"! You can use
> stainless steel bolts, but with plain steel plated nuts, for instance.
>
> My question: To those of you who know what I'm talking about, what
> other solutions do you use?
Commercial solution, that for example Swagelok uses
in their SS parts, is to silver-coat the thread of
one part - usually nut. Works really well.
The brute-force solution is to use anti-seize grease
on the thread. Propably what you should do - I use
Omega 99, but any such compound is ok. In places where
graphite (or other stuff that makes a mess - most of
these make a mess) is a no-no, high-vacuum silicone grease
works ok.
I know the hard way that clean SS surfaces of nut and
bolt can seize even at room tempeture when installing
them together, BEFORE even really tightening. That
happened with parts that I had just cleaned of any grease
in hot acetone in ultrasonic cleaner - if memory serves, it
was M8 fine thread in aisi 316L. The way to open them
is to turn the nut while hammering it - it will open a
little bit each time hammer hits it from top. I've seen
people do this to BIG nuts when they've forgotten to use
the anti-seize compound and the parts have been to 300+ C..
It takes a large hammer (BFH) and long wrench to open. :)
Kristian Ukkonen.
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> other solutions do you use?