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Does anyone remember what those mushroom-type nuts were that were used with threaded rods when putting pay phones on cinder block walls? We have an installation of large flat-screen TVs on block walls in classrooms. The customer insists on threaded rods through the wall to the classroom on the other side. We nicknamed them 'mushrooms', where the rod threaded into a hub on them and the view on the other side was just a domed dimple, similar to the head of a carriage bolt. Any idea of what they were called?
Last edited by EV607797; 02/20/17 10:27 PM.
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Might have been a weld nut?
John 807
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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They looked like this, but instead of an attached rod, there was a threaded socket to accept the rod coming through the wall so that only the dimple showed: PICTURE
Ed Vaughn, MBSWWYPBX
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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John, I think you're onto it. I found this using the term 'weld nut' in a search and came up with this, which is very close. The ones I'm seeking are larger and have more of a smooth domed finish, like the head of a carriage bolt. Thanks for the information. WELD NUT PICTURE
Ed Vaughn, MBSWWYPBX
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Ed try flat cap nut or blind nut.
John 807
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Take a look on the McMaster-Carr website. Binding Posts Steel Round-Base Weld Nuts
Patrick T. Caezza Santa Paula, CA 93060 C-7 - Low Voltage System Contractor - Lic# 992448
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If your talking about 8" CMU, just use a carriage bolt, you can easily find 12" lengths at home depot. Make sure you drill from the opposite side of the TV mount, just in case you blast a hole the size of a barn door, upon exit; the mount will cover this up. Once you thread your nut, you'll also have to plan to cut any excess bolt length off with a 4" cut-off wheel..
Last edited by rustynails; 02/21/17 12:07 AM.
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RIP Moderator-Nisuko-Tie, General
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Last edited by skip555; 02/21/17 10:39 AM.
Skip ------------------------------------
Serving SW and West central Fl since 1984
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Sex bolts, like we use on door closers? https://en.wikipedia.org/wiki/Sex_bolt
Jeff Moss Moss Communications Computer Repair-Networking-Cabling MBSWWYPBX, JGAE
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Moderator-1A2, Cabling
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Ed,
We always called them Cap Nuts, and they looked like Skip's picture.
Sam
"Where are we going and why are we in this hand basket?"
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Like Sam and Skip say, cap or acorn nuts and I would definitely use a washer too.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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What I'm looking for has a 2-1/8" round mushroom that only protrudes from the wall's surface about 1/4" total. It looks like the head of a carriage bolt, only much larger in diameter in order to spread the holding power over a larger area. There are pictures of them in the BSP for coin phone installation, but I can't get a picture on here.
Acorn nuts, etc. protrude too far out and there is an issue with appearance once a nut and washer are used. If all else fails, we may just have to go the route of long carriage bolts.
Ed Vaughn, MBSWWYPBX
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Moderator-1A2, Cabling
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Ed, if you have to, get a die set and cut threads onto long, unthreaded rod. I've done that before.
Sam
"Where are we going and why are we in this hand basket?"
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Are the heads on these still too small for you? Elavator Bolts Or are you looking for a nut with rounded (mushroom) head?
Last edited by Mercenary Roadie; 02/22/17 08:33 PM.
Patrick T. Caezza Santa Paula, CA 93060 C-7 - Low Voltage System Contractor - Lic# 992448
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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These are closer, but still not it. The rod part needs to be 12" long, and yes, the head needs to be rounded. The ideal solution is for the nut to have a female threaded entry so that variable length threaded rod can be used.
Ed Vaughn, MBSWWYPBX
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I think this is what Ed is talking about. I found it at the bar I work at. It was through a brick wall but is otherwise unused.
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This particular one looks to be 5/16 thread, the cap is 2-1/2" across and it only sits 1/4 to 3/8 inch proud of the wall.
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Ya know, something like that would be a simple thing for a welding shop to make up. Threaded rod welded to a disc. Krylon rattle can paint to match the wall. Easy peasy.
Don't forget that there are double-female threaded rod couplers. You could cut the "stem" of our mushroom back inside the wall, screw on a coupler with perhaps a jam nut then use a regular bolt on the TV mount side. But if looks on that side aren't important just hang the mount on the threaded rod protruding from the wall, sock it up with a nut and washer then cut the excess length.
-Hal
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What does it look like where the threads meet the cap?
Patrick T. Caezza Santa Paula, CA 93060 C-7 - Low Voltage System Contractor - Lic# 992448
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Welded I'm sure. Definitely two pieces.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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I guess you could call it a weld. They don't strike me as being made of the same material. The threaded stud shows some rust, while the mushroom cap seems more like stainless. I could take some more photos when I go to work tonight. It's definitely not removable, the thread and cap are permanently joined by what looks like a weld.
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Chris, you're spot-on. That is exactly what I'm looking for. I just remember the actual head having about a 1" long female threaded hub on the back side to receive the 5/16" threaded rod. That's why we nicknamed them "mushrooms", because this hub looked like the stem of a mushroom with the obvious mushroom head.
I installed hundreds of pay phones back in the 90s. I can't believe that I don't have any of these things left or at least a name/manufacturer for them!
And they make fun of people for hoarding. If I had only kept those invoices or catalogs. Wait! I do still have my full set of Sprint/North Supply catalogs in storage and I purchased them through SNS. The end may be in sight.
Ed Vaughn, MBSWWYPBX
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Ed -
If we'd kept all the stuff (material, catalogs, reference guides etc.) that we ever had, we'd be featured on that show "hoarders".
Don't second guess yourself.
The Board is here to help you find all those things.
And it works!
Sam
"Where are we going and why are we in this hand basket?"
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Glad I could help. Ed, if you find a manufacturer and/or part number, be sure to post back here. I'm not likely to be installing any payphones, but those things could be really handy for mounting all kinds of other things through cement and especially crumbly old brick.
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Just wondering would a supplier like Fastenal or Granger have a fitting like that?
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Just wondering would a supplier like Fastenal or Granger have a fitting like that? I checked and unless they are special order they don't show up on their sites.
Patrick T. Caezza Santa Paula, CA 93060 C-7 - Low Voltage System Contractor - Lic# 992448
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