On 2012-02-17, Jon Danniken wrote:
I'm thinking about using the red threadlocker (the "permanent" type) on a
fastener to avoid flashing off the zinc coating through welding.

An example of the application can be seen in this image:
http://i.imgur.com/YHH7P.jpg

In that image, the nut at the top is welded to the threaded rod, and its
purpose is to rotate the threaded up and down to extend/retract the threaded
rod against a heavy load (generally, a house structure).

The thread size in my application will be 1.25" x 7 TPI.

Do you think that the red threadlock will hold the nut to the threaded rod
when the threaded rod has significant weight bearing down on it?

Go for the bearing mount version -- which is also red, IIRC. It
will set up better in threads which may be as loose as these 1.25x7
threads may be.

But an alternative would be a cross hole with a dowel pin in it
to keep the nut from turning on the thread.

Is that thread an Acme thread? I would consider that better
than a normal V thread for the task.

Good Luck
DoN.

--
Remove oil spill source from e-mail
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---