Ok... I have an application where I need to pull to items together, and use
a locking nut/bolt combination. Because of the location it needs to be
stainless. So far my attempts have met with limited or no success. The
stainless nut and bolt tend to gall and sieze before pulling the two pieces
fully together. Just for the heck of it I tried it with plane old grade 5
steel bolts & nuts and it cinched it down just fine.

So....

What can I do to get a locking application using stainless bolts that will
draw down without galling before its tight?

One thing I thought of was to use nylocks with never sieze compound. I just
wonder if the never sieze will keep the nylocks from getting warm enough to
melt the plastic and/or if it will keep it from locking in place once its
tightened down?

The only other idea I had was to use a plane stainless nut with never sieze,
clean the bolt thoroughly and then run a second nut on with red loctite to
double nut it in place. It is not possible to use an external clamp to
compress the pieces together that are being bolted.

"Bob La Londe" fired this volley in news:0ASvr.979$CQ6.75
@newsfe17.iad:

One thing I thought of was to use nylocks with never sieze compound.

No-sieze is not meant to lubricate, only to prevent corrosion between the
elements from locking them up forever. Get a thread lubricant.

Even machine oil helps, although some will deteriorate the Nylok element.

What sort of app do you have that galls the fasteners at their rated
torque? (or are you severely over-torquing them?)

LLoyd

"Bob La Londe" wrote in message
...
Ok... I have an application where I need to pull to items together, and
use a locking nut/bolt combination. Because of the location it needs to
be stainless. So far my attempts have met with limited or no success.
The stainless nut and bolt tend to gall and sieze before pulling the two
pieces fully together. Just for the heck of it I tried it with plane old
grade 5 steel bolts & nuts and it cinched it down just fine.

So....

What can I do to get a locking application using stainless bolts that will
draw down without galling before its tight?

One thing I thought of was to use nylocks with never sieze compound. I
just wonder if the never sieze will keep the nylocks from getting warm
enough to melt the plastic and/or if it will keep it from locking in place
once its tightened down?

The only other idea I had was to use a plane stainless nut with never
sieze, clean the bolt thoroughly and then run a second nut on with red
loctite to double nut it in place. It is not possible to use an external
clamp to compress the pieces together that are being bolted.


I have mentioned this stuff here before, but I think this is the perfect
application for it.
http://www.vibra-tite.com/vc3.php

You apply it to the male threads and it dries to a soft plastic that will
both lock and prevent galling and is removeable.

I have no relation to the company, I am just a happy user.

"anorton" wrote
in message
m...

"Bob La Londe" wrote in message
...
Ok... I have an application where I need to
pull to items together, and use a locking
nut/bolt combination. Because of the location
it needs to be stainless. So far my attempts
have met with limited or no success. The
stainless nut and bolt tend to gall and sieze
before pulling the two pieces fully together.
Just for the heck of it I tried it with plane
old grade 5 steel bolts & nuts and it cinched
it down just fine.

So....

What can I do to get a locking application
using stainless bolts that will draw down
without galling before its tight?

One thing I thought of was to use nylocks with
never sieze compound. I just wonder if the
never sieze will keep the nylocks from getting
warm enough to melt the plastic and/or if it
will keep it from locking in place once its
tightened down?

The only other idea I had was to use a plane
stainless nut with never sieze, clean the bolt
thoroughly and then run a second nut on with
red loctite to double nut it in place. It is
not possible to use an external clamp to
compress the pieces together that are being
bolted.


I have mentioned this stuff here before, but I
think this is the perfect application for it.
http://www.vibra-tite.com/vc3.php

You apply it to the male threads and it dries to
a soft plastic that will both lock and prevent
galling and is removeable.

I have no relation to the company, I am just a
happy user.
What is the temperature environment ? Check this
about vibra-tite:


Operational temperature range -65?F to
+165?F (-54?C to +74?C) For other temperature
applications, please consult factory

"Bob La Londe" wrote in message ...

Ok... I have an application where I need to pull to items together, and use
a locking nut/bolt combination. Because of the location it needs to be
stainless.

Bob, where stainless is indicated, bronze will often work as well. Just
about the same tensile strength, and generally no significant corrosion
issues from dissimilar metals. It's not uncommon to use silicon bronze and
stainless together in marine environments. Anti-seize compound is still
recommended.

Tom