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What is this Called and Where do I Buy One?

08/27/2018 3:30 AM

A few days ago, I was working on the door panel of my 1980 Alfa Spider and one of these nuts on the door was missing and another was loose. The nut is one of those that is pressed on to the inner door frame. One is still okay, one came out and the last one is missing. I can push one back on the door and I can either crimp it back on or I can glue it.

Here's a picture of something that looks close. Can someone tell me what this is called and where do I buy another one?

The difference between the picture and the real nut is

1. The surface A is almost square

2. Height C is not as tall.

The nut fits in a cut out in the sheet metal. Surface B sits on the back side of the sheet metal. Surface A protrudes slightly from the front of the sheet metal. It's crimped into the sheet metal.

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#1

Re: What is this called and where do I buy one?

08/27/2018 4:02 AM

They're called T slot nuts.

It doesn't look particularly hard to make from scratch if you can't get the correct size.

Another possibility would be a cage/clip nut.

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#8
In reply to #1

Re: What is this called and where do I buy one?

08/27/2018 3:31 PM

T Slot nuts. I'll check on it. Thank you!

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#2

Re: What is this called and where do I buy one?

08/27/2018 4:07 AM
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#3

Re: What is this Called and Where do I Buy One?

08/27/2018 10:29 AM

The picture is a T slot nut but the description is something else. If it crimps into a sheet metal panel the protrusion would be much less. If this was factory fitted it might not be available as a spare & could be difficult to install. As Spades suggests, a cage nut with the right thread could work well.

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#19
In reply to #3

Re: What is this Called and Where do I Buy One?

08/28/2018 5:24 PM

Thanks for the info. You're correct about the T Slot nut being different than what I'm looking for. When I wrote that it crimps on, what happens is that the nut is placed into the sheet metal and the nut face (A in the diagram) is distorted to hold it in place (what I called crimping).

Using a cage nut may be something I do, but first I'm going to try a plastic one.

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#4

Re: What is this Called and Where do I Buy One?

08/27/2018 12:38 PM

What you are showing is called a T-Slot nut that is commonly used for clamping a work-piece to a machine table or a fixture.

I believe what you are looking for is called one of several things though I don't know the true name.

  • Automotive captive nuts
  • Rivet nuts. Which are typically round and tubular
  • Panel crimp nuts
  • Crimping cage nut

Though none of my searches produced a result for the specific nut you are looking for, I would suggest that you visit your local body shop that specializes in Alfa Romeo repair. They may even have some nuts or know where to get them.

Have you tried any internet Alfa Romeo enthusiast blogs or forums? They may answer your question in seconds.

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#18
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Re: What is this Called and Where do I Buy One?

08/28/2018 5:20 PM

Thanks for the info! I like the plastic nut idea, since it should hold well and if I need to enlarge the hole, it'll be easy to do. The cage nut also seems like a good idea, so if the plastic nut doesn't work, I'll try it.

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#5

Re: What is this Called and Where do I Buy One?

08/27/2018 1:23 PM

If this is steel you might be able to tack weld a nut in place...I had this problem on aluminum, and ended up gluing it in place...I would check the enthusiast websites for any info, and ebay...and youtube...

...you also might consider some type of clip on nut....

https://en.wikipedia.org/wiki/Cage_nut

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#17
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Re: What is this Called and Where do I Buy One?

08/28/2018 5:19 PM

Thanks Solar!

I'm not a welder, so that wouldn't work - it's something that I've always wanted to learn how to do!

I'm probably going to use the plastic snap in piece. So, in the future, if someone wants to bring the car back to factory specs, they can (in case it ever becomes a true collectible).

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#20
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Re: What is this Called and Where do I Buy One?

08/28/2018 5:25 PM

You're good! That's my door panel (different color, but same panel)

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#6

Re: What is this Called and Where do I Buy One?

08/27/2018 1:33 PM

Is it one of these?

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#7
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Re: What is this Called and Where do I Buy One?

08/27/2018 3:00 PM

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#21
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Re: What is this Called and Where do I Buy One?

08/28/2018 5:26 PM

Thanks for the tip! I'm going to try one of these plastic nuts first. If it doesn't work, I'll try the cage nut.

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#9

Re: What is this Called and Where do I Buy One?

08/27/2018 5:59 PM

A more general term is "press nut"; they come in many configurations, typically from industrial fastener sources. "PEM" is one brand name.

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#22
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Re: What is this Called and Where do I Buy One?

08/28/2018 5:27 PM

Press nut. Thank you. I'll see if I can get one.

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#10

Re: What is this Called and Where do I Buy One?

08/27/2018 8:35 PM

Found this, called rivet nut....

25pcs Silver Flat Head Rivet Nut M8 for Automotive Insert Nutsert

...cheap $4.

...but you need the threaded insert tool....cheapest one $22 harbor freight

https://www.harborfreight.com/45-piece-threaded-insert-riveter-kit-1210.html

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#11
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Re: What is this Called and Where do I Buy One?

08/27/2018 8:53 PM
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#12
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Re: What is this Called and Where do I Buy One?

08/27/2018 9:13 PM

They may not work too well in this case as he already has a square hole in the panel.

We call those devices "nutserts" and I use literally thousands of them in the 4mm thread size for some jobs that I perform for a client.

The smaller sizes can be inserted with a pneumatic riveter set to about 30psi or, if you are just doing a small number, a simple screw and nut (or bolt and nut for the larger ones) will compress them sufficiently.

I make my own mandrels from a length of 4mm rod.

I wonder if this problem could be overcome just by pop riveting a small metal plate with a suitably threaded hole to the backside of the frame, has to be more reliable than glue.

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#13
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Re: What is this Called and Where do I Buy One?

08/27/2018 9:51 PM

Maybe you could just fiberglass the hole and use an insert....or pc7...

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#24
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Re: What is this Called and Where do I Buy One?

09/10/2018 6:17 PM

I've seen these. I need something square. Thanks for the info.

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#14

Re: What is this Called and Where do I Buy One?

08/28/2018 8:23 AM

It's a pierce nut. https://www.youtube.com/watch?v=k5bj6bLub-g.

I doubt you'd have much luck crimping it back in, though if you have access to a torch, they can be brazed back in with good results.

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#25
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Re: What is this Called and Where do I Buy One?

09/10/2018 6:22 PM

That's it! Pierce nut.

I was thinking of crimping it in with a portable mini vice and putting some chunk of hard metal between the vice and the nut. That way, the hard metal will deform the nut and hold it in place.

Or I can glue it in too.

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#15

Re: What is this Called and Where do I Buy One?

08/28/2018 11:47 AM

Did you feel around down inside the door and look under the seat and carpet?

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#26
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Re: What is this Called and Where do I Buy One?

09/10/2018 6:23 PM

That's where I found one of them. One was still in the door frame and one had fallen into the inside of the door. The other is lost.

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#16

Re: What is this Called and Where do I Buy One?

08/28/2018 12:29 PM

I'm just a bit perplexed: why didn't you take a picture of the one that came out, and show us the actual dimensions?

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#27
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Re: What is this Called and Where do I Buy One?

09/10/2018 6:25 PM

I'm not looking for someone to lead me to an exact part. I can find one, but I didn't know what it's called, so I had nowhere to start ... well, I actually started on Amazon and found the one with a slot (the picture on my original post). It's not the right one of course, but I knew someone here would be able to lead me to the right place.

Pierce nut - that's what I need to get.

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#23

Re: What is this Called and Where do I Buy One?

08/31/2018 9:10 AM

Giving dims. would help considerably.

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