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It's not, or shouldn't be, friction on the threads that holds a
bolted joint together; it's the loaded tension of the stretched
bolt. For any bolted joint potentially exposed to moisture, with a
few exceptions*, anti-seize is appropriate. Common (cheap)
anti-seize, which uses ground ceramics, is OK for non-high-temp
applications; copper-based is better, and nickel-based is best for
high-temp applications (ex. EGR valves, spark plugs, etc.). <br>
<br>
Like Mirek, and after much thought, I've taken to carefully putting
a bit of A-S on brake fitting threads. Maybe it's newer (lack of)
quality fittings and cylinders, but in the brake work I've done
recently the fittings haven't screwed-in as easily as I think they
should, and we've all probably rounded the 'nut' on brake fittings
that have gotten corrosion-welded in place (requiring cutting and
replacing the line and possibly the cylinder). Note brake fluid
shouldn't ever come in contact with the A-S, if the BF is getting
past its seal that has to be addressed properly.<br>
<br>
Fasterner 'science' is fascinating <br>
<br>
Explained well here:<br>
<a class="moz-txt-link-freetext" href="https://www.google.com/search?client=firefox-b-1-d&q=bolt+fastening+theory#kpvalbx=_IzREY-bKO43ZkPIP16m4qAE_44">https://www.google.com/search?client=firefox-b-1-d&q=bolt+fastening+theory#kpvalbx=_IzREY-bKO43ZkPIP16m4qAE_44</a><br>
<br>
More:<br>
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Bolted_joint">https://en.wikipedia.org/wiki/Bolted_joint</a><br>
<br>
* Where I don't use A-S, I may use threadlocker (usually blue, red
for inserts). I can't make up my mind on wheel studs; A-S for easy
removal, threadlocker for 'security' or nothing. Note both A-S and
threadlocker will affect bolt/stud tension for a given torque value.<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/10/2022 5:04 AM, m.g.sharp--- via
Healeys wrote:<br>
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<p class="MsoNormal">Hi Simon, I often use an anti-seize paste
on threads and I have never had a fastener loosen off and it
definitely aids removal later. For example, One common
component to seize is the capillary tube where it goes through
the nut on the temperature sensor. For decades I have coated
the tube where it passes through the nut, as well as the
thread, and it makes removal of that nasty little thing so
much easier. Mind you, it is a tapered pipe thread and they
tend to stay tight. Another instance is brake line fittings;
I slide the fitting back, lightly coat the brake line and then
slide the fitting up to the flare, and coat the threads on the
fitting, taking care not to get any into the hydraulic
circuit. I have never broken a brake line from it seizing in
the nut after doing this. I use “Copper Anti Seize” made by
Permatex.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers, Mirek<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span
style="mso-fareast-language:EN-CA" lang="EN-US">From:</span></b><span
style="mso-fareast-language:EN-CA" lang="EN-US"> Healeys
<a class="moz-txt-link-rfc2396E" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> <b>On Behalf Of
</b>Simon Lachlan via Healeys<br>
<b>Sent:</b> October 10, 2022 7:30 AM<br>
<b>To:</b> 'Healeys' <a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br>
<b>Subject:</b> [Healeys] Tightening bolts<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I had to loosen the
bolts attaching the hinges on my BT7 the other day. 6 of
them turned quite easily after some fairly hefty initial
work. One needs a couple of whacks with an impact driver to
get it started and one was just plain loose.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">So, now I want to
tighten them up. Plainly, I want to be able to undo them
again at some time or other….<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Does the team think that
something like Coppaslip (or whatever it’s called) is a good
idea. Half of me says, “Use it. You’ll be able to tighten
them up that little bit more while still being able to undo
them later”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">And the other half says,
“Don’t use it. It will enable the bolts to loosen themselves
off.”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Which half of me is
right???<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thanks, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Simon<o:p></o:p></span></p>
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