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This nut is driving me nuts

T

Teakettle

Member
On a piece of equipment, I have a section of stainless tubing with a blind end welded on with a hole in it, and the person who fabricated it welded a hex nut against the hole on the inside before welding the blind end on so that a bolt can be threaded in. Guess what, the weld holding that nut broke off, and there's no access to the inside of the tube to reattach it.

I need the end to be essentially flat so I can't weld a hex nut on the outside. So what I think I need to do is attach a plate nut, but I'm having a heck of a time finding one in the proper size for the bolt (1/2-20), even McMaster doesn't stock fine thread ones.

Any leads on where to find such a thing or alternatively any other suggestions? Not sure if a rivet nut is quite the right thing here and it's also hard to find them that large.

Thanks!
 
When you said stainless tube my mind automatically went to some sort of hydraulic application that needed to be sealed. After reading more that does not seem to be the case. A picture would be quite helpful.
 
Without a photo or more information, it's difficult to come up with ideas or suggestions, but here goes:

Is it possible to cut the end out so that the loose nut will fall through, then weld a nut to a new end that gets welded to the remaining end? Then your nut is inside and you end up with a flat surface.
 
They have several choices. Here's one.
www.boltdepot.com/Product-Details.aspx?product=5264[url] Good outfit. I buy a lot from them.
 


why do you even need that blind end. Just cut it off and weld the nut to the tube then grind it as flat as it needs to be.
 
I have a lathe and a set of taps and I can certainly make a custom plate nut if necessary but Id just prefer to buy one if theyre available
 
If you can capture the loose nut, drill a couple of holes of appropriate size near the edge of where the nut will be on the inside, pull the nut up to the holes with a bolt or piece of all-thread, and reweld the nut through your drilled holes, making sure you fill the holes so they don't leak. You could countersink your weld holes to make it easier to get the weld in on the nut. BTDT more than once. steve
 
(quoted from post at 14:52:47 08/21/22) On a piece of equipment, I have a section of stainless tubing with a blind end welded on with a hole in it, and the person who fabricated it welded a hex nut against the hole on the inside before welding the blind end on so that a bolt can be threaded in. Guess what, the weld holding that nut broke off, and there's no access to the inside of the tube to reattach it.

I need the end to be essentially flat so I can't weld a hex nut on the outside. So what I think I need to do is attach a plate nut, but I'm having a heck of a time finding one in the proper size for the bolt (1/2-20), even McMaster doesn't stock fine thread ones.

Any leads on where to find such a thing or alternatively any other suggestions? Not sure if a rivet nut is quite the right thing here and it's also hard to find them that large.

Thanks!
Click to expand...


If your blind end is 1/2" thick, or close to, you can use one of these.
https://www.gardspecialists.com/thread-repair/gardserts/fine
 
I had to look up what a plate nut is. Why does it have to be fine thread? Get what ever plate nut you can and then use the corresponding bolt.
 
(quoted from post at 18:34:24 08/21/22) If only it were that easy! The tube is a couple of inches
across so I cant weld a nut to the open end
Click to expand...


Very difficult to picture.
 
check

Bore the existing hole bigger to equal wrench size.
Fish the nut and secure to center of hole.
Then weld it up from the outside.
Grind off high spots.
If the plate is thick enough, it would be better to also countersink the new hole for more weld purchase to plate area.
 
be ice to see a pic of your set up. to see exactly what u have and how thick that end plate is. might be best to cut the end off , weld the nut on good then weld the end back on.
 
Sounds to me like your best approach is to cut the tube just above the blind end, make a new blind end (or repair the existing one), and weld the new-or-repaired blind end back onto the tube.
 
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