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Author Topic: Sway Bar Frame Mount Rivet Nut Replacement.  (Read 1653 times)
Ag77T/A
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« on: March 31, 2013, 01:47:35 PM »

I thought I would share my rivet nut repair.

A couple of bolts were stripped out of the sway bar frame mounts on my replacement subframe.  Evidently some of the later frames were just threaded like the camaros and did not use rivet nuts so I decided to install some like my original '77.

I sourced the large flange steel 3/8-16 inserts from Fastenal SKU:0125625

I had the benefit of borrowing the installation tool but after a quick search WWW.HANSONRIVET.COM sells the same type I used plus gives a little instruction on proper use.


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First I drilled out the original bolt threads to a size slightly smaller than the OD of the rivet nut then used a rotary rasp to make sure I had a snug fit with the knurls to keep it from rotating during installation.




I then used a rivet nut tool to install making sure not to crush the nut by overtightened the tool.
If you don't have a tool you can make your own using a hardened bolt and nut with a couple of thick washers.





Finished product that IMHO is a much stronger mounting point.



« Last Edit: April 01, 2013, 12:16:20 AM by Ag77T/A » Logged

LeighP
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« Reply #1 on: March 31, 2013, 07:23:47 PM »

Very nice. Did exactly the same for my frame when I was rebuilding it. I added a weld tack to the edge of the rivnut, just in case.

Another neat job I've seen is to drill the hole large enough for a hi tensile nut, then weld the nut into the frame.....but I think the rivnut is easier.  Very Happy
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Regards,
Leigh

Sydney, Australia
Former Firebirds -
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe

ryeguy2006a
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« Reply #2 on: April 01, 2013, 12:10:16 PM »

Another neat job I've seen is to drill the hole large enough for a hi tensile nut, then weld the nut into the frame.

That is what I did, and I think that you are right, the rivnuts look much easier.  Cool
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Grand73Am
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« Reply #3 on: April 02, 2013, 03:39:12 PM »

Neat job. But, I'm curious about what keeps them from pulling out?
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Steve F.
Ag77T/A
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« Reply #4 on: April 02, 2013, 04:21:56 PM »

Neat job. But, I'm curious about what keeps them from pulling out?

The tool collapses and mushrooms the barrel outward thus pinching the panel between it and the outer flange of the insert. The knurls aid to keep it from rotating when removing or installing the attachment bolt.
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Grand73Am
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« Reply #5 on: April 02, 2013, 04:43:59 PM »

Okay, I see. Thanks!
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Steve F.
thebird3d
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« Reply #6 on: April 03, 2013, 05:24:09 PM »

I had a hell of a time trying to find a rivet nut where I live, online or local, no one supplied one that was large enough with the proper threading.  I ended up using a nut in the frame instead.
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Ag77T/A
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« Reply #7 on: April 03, 2013, 05:59:04 PM »

I had a hell of a time trying to find a rivet nut where I live, online or local, no one supplied one that was large enough with the proper threading.  I ended up using a nut in the frame instead.

I had a hard time trying to find a steel insert. Everyone that had the correct size only stocked aluminum. I got lucky with Fastenal, they had special ordered a large bulk box for a customer but somehow ordered the wrong type and was sending them back when I walked in. They just gave me a few and said no charge and have a nice day.  Very Happy
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LeighP
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« Reply #8 on: April 03, 2013, 11:05:44 PM »

I had a hell of a time trying to find a rivet nut where I live, online or local, no one supplied one that was large enough with the proper threading.  I ended up using a nut in the frame instead.

Yeah, I had to use metric....imperial thread rivnuts are special order here ($)..... Rolling Eyes
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Regards,
Leigh

Sydney, Australia
Former Firebirds -
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe

formula jg
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« Reply #9 on: May 23, 2013, 09:28:00 AM »

Can someone confirm what the frame wall thickness is at the sway bar bolt hole location?

The riv-nuts come in different grip ranges and I don't have access to my car to measure it for several days but need to order the riv-nuts now.

thx
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Ag77T/A
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« Reply #10 on: May 23, 2013, 09:37:22 AM »

Can someone confirm what the frame wall thickness is at the sway bar bolt hole location?

The riv-nuts come in different grip ranges and I don't have access to my car to measure it for several days but need to order the riv-nuts now.

thx

The steel inserts that I used in this thread had a grip range of .027" - .150" and they worked perfect.  I measured mine before I ordered and it's closer to the .150" range.

Hope this helps and good luck.
« Last Edit: May 23, 2013, 09:52:24 AM by Ag77T/A » Logged

formula jg
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« Reply #11 on: May 23, 2013, 09:44:59 AM »

That definitely helps Ag, thank you!

Do you recall what the riv-nut tool cost was?
« Last Edit: May 23, 2013, 09:47:45 AM by formula jg » Logged
Ag77T/A
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« Reply #12 on: May 23, 2013, 10:20:24 AM »

That definitely helps Ag, thank you!

Do you recall what the riv-nut tool cost was?


Your welcome John.  Cool

I borrowed the tool I used but the ones I found online were around $45.
 
You can actually make your own using a hardened bolt, a few nuts and a couple of washers. (disregard the sizes listed in the pic. Size accordingly)



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formula jg
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« Reply #13 on: May 23, 2013, 10:40:25 AM »

Ag,
I was wondering how to do it with a bolt and nuts, the pics explain the process perfectly but why the hardened bolt?
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Ag77T/A
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« Reply #14 on: May 23, 2013, 12:10:53 PM »

You use a hardened bolt to help keep from stripping the threads while collapsing the nut down. It's not totally required but it's a bit of insurance from all the stress your putting on the bolt.
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formula jg
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« Reply #15 on: May 23, 2013, 12:49:45 PM »

Got it, thx again.
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