Bob is correct, no 'fluid' lubricants are used, there are specific 'dry' lubes
-spray on, bake out in vacuum oven, then use. that can be used in flight
payload systems. The downside to that is that the fasteners are almost always
Stainless Steel and dry stainless riding on dry stainless is also called
'welding' (or galling) Trying to remove an unlubricated screw from an
unlubricated stainless tapped hole is the biggest PITA that I know of. Yes,
lubricating a bolt will apply more stress to the bolt itself, simply because
more of the rotational load (Torque) is going into the threaded interface, and
less is going into the sliding friction of bolt to washer to whatever. that
being said, a lubricated bolt, torqued properly, will ALWAYS apply the design
load to the part interface, which a dry bolt will not. ALWAYS lubricate your
head studs, main bearing bolts, and rod bolts -you'll not be sorry.
Mark Haynes
It only goes one way-Pay it Forward
HAN6L12977
HAN5L8016
NASA - i.e. space assets do not use "fluid" lubricants, as far as I know they
do not use any lubricants but for a very different reason. When the assets go
into space
(vacuum) lubricants will out gas, these vapors will re-condense on the optics.
This
deteriorates / makes optical systems non-useable. There are almost no assets
that do not
have some type of optical system. So lubricants are a major no-no.
Bob Kitterer
1960 Austin Healey Sprite (Mk IV in disguise) - in storage
1966 Austin Healey Sprite Mk III (Trevor) - still in boxes - in storage
On Jun 22, 2011, at 9:19 PM, Dave KK7SS wrote:
> A thought springs to mind.
>
> When I was contracted at NASA I was told that
> a) All bolts, nuts, etc were to be assembled dry (not lubricated),
> b) A lubricated bolt would not torque down correctly due to the change in
friction
and would be subject to greater stress.
>
> Is NordLock saying thats' wrong?
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